A magnesium ingot vacuum atmosphere production line and production method

Abstract

A magnesium ingot vacuum atmosphere production line and production method, including a closed ingot casting machine (lifting mechanism, module transverse movement chain group and ingot mold sealing protection system), a vacuum furnace and a vacuum feeding bin, a pouring pipe and a production method, the vacuum furnace is a self-heating heat preservation heat insulation furnace body layer and a middle part crucible layer, the furnace body sealing cover is provided with various interfaces for connecting the related components and the furnace body sealing, the vacuum feeding bin is a double-layer hollow pipe, the hollow pipe wall is provided with a vacuum valve port and a protective gas port, for installing a ball valve to connect the vacuum pump and the vacuum and protective gas into the vacuum furnace, three mounting ports are further provided on the feeding bin hollow pipe, three doors are installed through the mounting ports, so that the magnesium ingot is preheated when entering the furnace, the liquid surface in the furnace is calm and the vacuum degree in the furnace is stable; the vacuum furnace is connected with the closed ingot casting machine through the pouring pipe connected to the pouring pipe connecting port; through the improvement of the structure of the vacuum furnace, the melting process and the ingot casting method, high-quality and full-automatic melting and production of magnesium alloy are realized.

Description

Technical Field

[0001] This invention relates to the field of magnesium alloy production equipment technology, specifically to a vacuum protective atmosphere furnace for magnesium alloys and its ingot casting process. Background Technology

[0002] Currently, the production of high-quality magnesium alloy parts generally involves remelting high-quality magnesium ingots before casting them into finished products. Therefore, the quality of magnesium ingots directly determines the quality of magnesium alloy products. Magnesium alloy melt is very easy to oxidize when it comes into contact with air at high temperatures. To prevent magnesium alloy oxidation, sulfur covering agents and nitrogen gas need to be added. However, the addition of covering agents can also cause secondary pollution. Existing melting equipment has low melting efficiency, resulting in a long preparation process cycle. In addition, the equipment is usually large in size, and safety cannot be guaranteed.

[0003] Therefore, it is essential to provide a relatively closed and suitable smelting environment for magnesium alloys, to avoid oxidation or secondary contamination of metallic magnesium, and to effectively control the elements in magnesium alloys, in order to produce high-quality magnesium ingots. Summary of the Invention

[0004] Therefore, a new solution is needed to address the above problems: providing a closed and well-protected production line to control the smelting and casting of magnesium alloys.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a specially designed vacuum chamber is used to gradually feed the magnesium alloy into a vacuum furnace from a high position to refine the magnesium alloy. By improving the structure of the vacuum furnace and the sealed ingot casting machine, and by adopting an improved melting process and a casting process with good sealing protection, the production of magnesium alloys is achieved through efficient, energy-saving, fully automated, and safe and controllable melting and casting under the conditions of heat preservation melting temperature and inert protective atmosphere, so as to produce high-quality magnesium ingots with controllable composition.

[0006] A magnesium ingot vacuum atmosphere production line and production method includes a closed ingot casting machine, a vacuum furnace and a vacuum feeding hopper, a pouring pipe connecting the vacuum furnace and the closed ingot casting machine, and a production method for casting ingots according to a fixed rhythm.

[0007] The sealed ingot casting machine includes a lifting mechanism (1), a module transverse moving chain (2), and an ingot mold sealing protection system (111). The lifting mechanism (1) includes three lifting hydraulic cylinders (101) fixed on the lower frame (108) and connecting rods (105) via rotating joints, an oil tank (103), several rotating joints (102), and a control system (not shown). Two pairs of connecting rods (105) and connecting rod two (104) are connected by rotating joints (102), and two pairs of rollers (106). The control system controls the movement of the lifting hydraulic cylinders (101) to drive the rollers (106) to slide on the roller track (107) to achieve close contact and separation between the sealed ingot casting machine and the pouring pipe (3) at the ingot mold position (204). The ingot mold sealing protection system (111) includes a mold cover lifting system (205) fixed on the frame (209). Mold cavity liquid level probe lifting system (206), protective air passage vent pipe (208), ingot position upper and lower limit rods (210), displacement sensor x2 (211).

[0008] The enclosed ingot casting machine also includes two sets of module transverse moving chains (2) fixed on the frame (209), including a geared motor (201) and a coupling (202) connected to its output shaft, two pairs of sprockets ×4 (203) installed at the outlet and inlet of the moving chain and sprocket shaft (207), several roller units (204) for installing ingot molds (214) and two upper and lower roller tracks (216) for the roller units to roll, and a heating cover (212). The motor (202) rotates and drives a pair of sprockets (203) at the outlet of the moving chain to rotate. The roller unit (213) and the sprockets (203) form a chain drive. During the casting process, the ingot mold (204) is first moved to the heating cover (212) for heating according to the design rhythm, and then transported to the pouring position (204) to wait for ingot casting.

[0009] The vacuum furnace consists of an outer layer (504) and a middle crucible (502) layer. A heating layer (503) is provided between the outer layer and the crucible layer. The furnace body sealing cover (501) has an alloy addition port (507), a pouring pipe installation port (508), a high-temperature casting pump installation port (509), a protective gas inlet (510), a thermocouple installation port (511), a liquid level probe installation port (512), a furnace heating electric unit connection bar (513), an oil leakage detection probe (514), an electrical box (515), a furnace pressure detection element installation port (4101), a furnace vacuum pump inlet (516), a vacuum feeding hopper installation port (517), and a control valve and metering pump installation port (518). These installation ports are used to install components associated with the vacuum furnace and to maintain the sealing and heat insulation of each installation port.

[0010] The vacuum feeding chamber (4) has a double-layer hollow tube structure. The hollow tube wall of the feeding chamber has a vacuum pump system ball valve installation port (409) and a protective gas ball valve installation port (410) for installing the corresponding ball valves. Opening or closing the corresponding ball valves connects or disconnects the vacuum pump and protective gas source. The hollow tube of the feeding chamber also has a vacuum gate valve installation port, an insulation door installation port, and a tilting door installation port. These installation ports are used to install the feeding chamber rotating door and its drive assembly (401), and the vacuum gate valve and its drive assembly (404). The compartment door and its drive assembly (405) are installed on the charging hopper or vacuum furnace sealing cover by the corresponding mounting brackets, and drive the corresponding valve (4041), compartment door (4051) and flip door (4081) to enter and exit the charging hopper. The charging hopper is a hollow tube and the charging hopper is divided into four sections from top to bottom: charging section (402), heat insulation section, vacuum heat insulation section and furnace entry section. This segmented design controls the preheating of magnesium ingots as much as possible and avoids heat loss due to the mixing of charging air and fluctuation of the liquid level in the furnace.

[0011] The casting pipe (3) is fixed to the vacuum furnace body by the casting pipe support frame (301), including an outer pipe (303) and an inner pipe (304). The inlet of the inner pipe (304) is connected to the outlet of the high-temperature stirring casting pump (302) installed on the sealing cover. The outlet of the inner pipe (304) is equipped with a movable nozzle. The movable nozzle of the ingot position (204) is pushed open by the ingot mold (214). The melt in the vacuum furnace is rotated by the high-temperature stirring casting pump (302) and enters the mold cavity to cast ingot through the inner pipe channel of the casting pipe.

[0012] The production method for casting ingots according to a fixed rhythm includes the following steps: a. By controlling the vacuum ball valve switch of the vacuum furnace and vacuum feeding hopper through the controller, the external vacuum pump is controlled to perform vacuum treatment inside the vacuum furnace and feeding hopper. The vacuum degree is detected by the element installed at the pressure detection element installation port (4101) in the furnace and is not higher than 0.1Pa. b. During the initial feeding, the feed inlet of the feeding hopper and the various doorways are opened by the control process, so that the high-purity magnesium metal can automatically fall into the crucible of the vacuum furnace. During the production process, the feeding is done according to the production rhythm. Magnesium ingots are fed into the vacuum chamber through the valve at the feed port (401) of the vacuum chamber. The fed magnesium ingots stop and preheat at the vacuum gate valve (4041), the partition door (4051) and the flip door (4081) according to the rhythm before sliding into the crucible of the vacuum furnace. Generally, the amount of magnesium ingots in the crucible is kept at 200±10 (kg). c. The vacuum valve and vacuum gate valve are closed by controlling the process through the controller, and the external inert gas source is controlled to fill the vacuum furnace and the charging hopper with inert gas through the inert gas inlet until the pressure of the inert gas in the vacuum furnace is about 0.1 MPa. d. The main heating component and resistance wire are controlled by the controller to heat the material in the vacuum furnace. The temperature rises to 750±20 (°C) to melt the high-purity magnesium ingot. At the same time, the casting pipe (3) of the production line and the sealed ingot casting machine are started for preheating. e. The rotation frequency of the internal stirring pump is adjusted by the controller to stir the material for 5±1 (min). f. By controlling the electronically controlled valve and metering pump, liquid magnesium alloy is extracted from the vacuum furnace for testing and to determine whether it meets the requirements for high-purity magnesium. If it meets the requirements, the electronically controlled valve and metering pump are shut down, and the qualified magnesium melt enters the forming mold for a rhythmic ingot casting process. The ingot casting process includes the following rhythms; F01. The controller starts the geared motor (201), and the module moves laterally by the chain group (2) by a distance equal to the width of the mold, moving the heated ingot mold (214) to the ingot position (204). F02. The mold cavity liquid level probe lifting system (206) drives the liquid level probe to descend a set distance into the mold cavity, and at the same time, the mold cover lifting system (205) drives the mold cover to descend a set distance. F03. The lifting mechanism (1) rises a set distance, the mold cavity of the ingot mold (214) and the pouring pipe (3) are in close contact at the pouring position (204), and the movable pouring at the movable outlet of the pouring pipe is pushed open; F04. The controller opens the protective gas passage vent pipe (208) that is connected to the mold cavity of the ingot mold (214) at the casting position, and performs a process of first venting the mold cavity and then introducing protective gas. F05. The protective gas is maintained at the set pressure. The melt is injected into the mold cavity of the ingot mold (214) under the rotation of the high temperature stirring and casting pump until the liquid level probe of the mold cavity detects that the liquid level has reached the set value. A signal is sent to control the liquid level probe of the mold cavity to rise, the lifting mechanism (1) to fall, the pouring pipe to leave the casting position, and the lifting distance of the lifting mechanism is received and sent to the controller by the upper and lower limit rods (210) of the ingot position and two displacement sensors (211) which are vertically fixed on the lower frame (108) and the upper frame (109). The mold cover lifting system (205) rises, and the module lateral movement chain moves laterally by one mold width again to carry out the next ingot casting cycle. g. If the magnesium liquid composition does not meet the requirements, the appropriate additives are added to the vacuum furnace through the alloy addition port (507) by the controller, and the rotation frequency of the high temperature resistant stirring and casting pump (302) is adjusted to stir the material so that the additives react with the excessive elements and precipitate at the bottom of the furnace. After the material in the vacuum furnace is kept still for 10±3 (min), the metering pump is turned on to take liquid to meet the composition requirements and proceed to step "f".

[0013] Compared with existing magnesium alloy vacuum melting production lines, this invention has the following advantages:

[0014] 1. Magnesium alloy vacuum melting equipment has better vacuum retention and better magnesium liquid refining effect.

[0015] 2. The ingot casting is carried out in a relatively sealed and well-protected mold cavity. The ingot production cycle is designed by lifting the ingot casting machine. The molten metal surface in the furnace remains static. The weight of the magnesium alloy melt to be cast can be well controlled by monitoring the liquid level through a liquid level probe, which saves equipment costs. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Appendix Figure 2 This is a structural view of the closed ingot casting machine of the present invention.

[0018] Appendix Figure 3 This is a top view structural diagram of the present invention.

[0019] Appendix Figure 4 This is a flowchart of the beat generation process of the present invention.

[0020] In the diagram: 1. Lifting mechanism 2. Module lateral movement chain 3. Casting pipe 4. Vacuum feeding hopper 5. Vacuum furnace 101. Lifting hydraulic cylinder × 3 102. Rotary pair 103. Oil tank 104. Connecting rod one 105. Connecting rod two 106. Roller 107. Roller track 108. Lower frame 109. Upper frame 111. Ingot mold sealing protection system 201. Gear motor 202. Coupling 203. Sprockets × 4 204. Ingot position 205. Mold cover lifting system 206. Mold cavity liquid level probe lifting system 207. Sprocket shaft 208. Protective air passage vent pipe 209. Frame 210. Ingot position upper and lower limit rods 211. Displacement sensor × 2 212. Heating cover 213. Roller unit 214. Ingot mold 215. Receiving plate 216. Roller track plate 301. Sprue support frame 302. High-temperature resistant stirring and casting pump 303. Outer pipe 304. Inner pipe 401. Feed port rotating door and its drive assembly 402. Feeding section 403. High-temperature glass observation port 404. Vacuum gate valve and its drive assembly 4041. Vacuum gate valve 405. Compartment door and its drive assembly 4051. Compartment door 406. Mounting bracket 407. Vacuum system connection pipe 408. Tilting cylinder and mounting assembly 4081. Tilting door 4082. Position 2409. Vacuum pump system ball valve mounting port 410. Protective gas ball valve mounting port 4101. Furnace internal pressure detection element mounting port 501. Sealing cover 502. Crucible 503. Heating layer 504. Outer layer 505. Leakage detection probe 506. Support base 507. Alloy adding port 508. Sprue mounting port 509. High temperature casting pump mounting port 510. Protective gas mounting port 511. Thermocouple mounting port 512. Liquid level probe mounting port 513. Furnace internal heating electric unit terminal block 514. Oil leakage detection probe 515. Electrical box 516. Furnace internal vacuum pump inlet 517. Vacuum feeding hopper mounting port 518. Control valve and metering pump mounting port Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Appendix Figures 1-4 The accompanying drawings are simplified versions of the embodiments and are intended only to clearly and concisely illustrate the purpose of the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of the embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] In the description of this invention, the terms "design", "fixed", and "connection" should be used in a broad sense. For example, they can refer to fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, direct connection, indirect connection through an intermediate medium, or internal communication between components. "Upper", "middle", and "lower" should be used in a broad sense to refer to the orientation of the accompanying drawings. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] A magnesium ingot vacuum atmosphere production line and production method includes a closed ingot casting machine, a vacuum furnace and a vacuum feeding hopper, a pouring pipe connecting the vacuum furnace and the closed ingot casting machine, and a production method for casting ingots according to a fixed rhythm.

[0025] As attached Figure 1-3 As shown, the sealed ingot casting machine includes a lifting mechanism (1), a module transverse moving chain (2), and an ingot mold sealing protection system (111). The lifting mechanism (1) includes three lifting hydraulic cylinders (101) fixed on the lower frame (108) and connecting rods (105) via rotating joints, an oil tank (103), several rotating joints (102), and a control system (not shown). Two pairs of connecting rods-1 (105) and connecting rod-2 (104) are connected by rotating joints (102), and two pairs of rollers (106). The control system controls the movement of the lifting hydraulic cylinders (101) to drive the rollers (106) to slide on the roller track (107) to achieve the tight contact and separation of the sealed ingot casting machine with the pouring pipe (3) at the ingot mold position (204). The ingot mold sealing protection system (111) includes a mold cover lifting system (205) fixed on the frame (209). Mold cavity liquid level probe lifting system (206), protective air passage vent pipe (208), ingot position upper and lower limit rods (210), displacement sensor x2 (211).

[0026] As attached Figure 2 As shown, the sealed ingot casting machine also includes two sets of module transverse moving chains (2) fixed on the frame (209), including a reduction motor (201) and a coupling (202) connected to its output shaft, two pairs of sprockets ×4 (203) installed at the outlet and inlet of the moving chain and sprocket shaft (207), several roller units (204) for installing ingot molds (214) and two upper and lower roller tracks (216) for the roller units to roll, and a heating cover (212). The motor (202) rotates and drives a pair of sprockets (203) at the outlet of the moving chain to rotate. The roller unit (213) and the sprocket (203) form a chain drive. During the generation, the ingot mold (204) is first moved to the heating cover (212) for heating according to the design rhythm, and then transported to the pouring position (204) to wait for ingot casting.

[0027] As attached Figure 1-3As shown, the vacuum furnace consists of an outer layer (504) and a middle crucible (502) layer. A heating layer (503) is provided between the outer layer and the crucible layer. The furnace body sealing cover (501) has an alloy addition port (507), a pouring pipe installation port (508), a high-temperature casting pump installation port (509), a protective gas inlet (510), a thermocouple installation port (511), a liquid level probe installation port (512), a furnace heating electric group connection bar (513), an oil leakage detection probe (514), an electrical box (515), a furnace pressure detection element installation port (4101), a furnace vacuum pump inlet (516), a vacuum feeding hopper installation port (517), and a control electric valve and metering pump installation port (518). These installation ports are used to install components associated with the vacuum furnace and to maintain the sealing and heat insulation of each installation port.

[0028] As attached Figure 1 As shown, the vacuum feeding chamber (4) has a double-layer hollow tube structure. The hollow tube wall of the feeding chamber has a vacuum pump system ball valve installation port (409) and a protective gas ball valve installation port (410) for installing the corresponding ball valves. Opening or closing the corresponding ball valves connects or disconnects the vacuum pump and protective gas source. The hollow tube of the feeding chamber also has a vacuum gate valve installation port, an insulation door installation port, and a tilting door installation port. These installation ports are used to install the feeding chamber rotating door and its drive assembly (401), the vacuum gate valve and its drive assembly (409), and the rotating door. 4) The compartment door and its drive assembly (405) are installed on the charging hopper or vacuum furnace sealing cover by the corresponding mounting bracket. The corresponding valve (4041), compartment door (4051) and flip door (4081) are driven by the respective drive assembly to enter and exit the charging hopper. The charging hopper is a hollow tube and is divided into four sections from top to bottom: charging section (402), heat insulation section, vacuum heat insulation section and furnace entry section. This segmented design controls the preheating of magnesium ingots as much as possible and avoids heat loss due to the mixing of charging air and fluctuation of the liquid surface in the furnace.

[0029] As attached Figure 1 As shown, the casting pipe (3) is fixed to the vacuum furnace body by the casting pipe support frame (301), including an outer pipe (303) and an inner pipe (304). The inlet of the inner pipe (304) is connected to the outlet of the high-temperature stirring casting pump (302) installed on the sealing cover. The outlet of the inner pipe (304) is equipped with a movable nozzle. The movable nozzle of the ingot position (204) is pushed open by the ingot mold (214). The melt in the vacuum furnace is rotated by the high-temperature stirring casting pump (302) and enters the mold cavity to cast ingot through the inner pipe channel of the casting pipe.

[0030] As attached Figure 1-4 As shown, the production method of casting ingots according to a fixed rhythm includes the following steps: a. By controlling the vacuum ball valve switch of the vacuum furnace and vacuum feeding hopper through the controller, the external vacuum pump is controlled to perform vacuum treatment inside the vacuum furnace and feeding hopper. The vacuum degree is detected by the element installed at the pressure detection element installation port (4101) in the furnace and is not higher than 0.1Pa. b. During the initial feeding, the feed inlet of the feeding hopper and the various doorways are opened by the control process, so that the high-purity magnesium metal can automatically fall into the crucible of the vacuum furnace. During the production process, the feeding is done according to the production rhythm. Magnesium ingots are fed into the vacuum chamber through the valve at the feed port (401) of the vacuum chamber. The fed magnesium ingots stop and preheat at the vacuum gate valve (4041), the partition door (4051) and the flip door (4081) according to the rhythm before sliding into the crucible of the vacuum furnace. Generally, the amount of magnesium ingots in the crucible is kept at 200±10 (kg). c. The vacuum valve and vacuum gate valve are closed by controlling the process through the controller, and the external inert gas source is controlled to fill the vacuum furnace and the charging hopper with inert gas through the inert gas inlet until the pressure of the inert gas in the vacuum furnace is about 0.1 MPa. d. The main heating component and resistance wire are controlled by the controller to heat the material in the vacuum furnace. The temperature rises to 750±20 (°C) to melt the high-purity magnesium ingot. At the same time, the casting pipe (3) of the production line and the sealed ingot casting machine are started for preheating. e. The rotation frequency of the internal stirring pump is adjusted by the controller to stir the material for 5±1 (min). f. By controlling the electronically controlled valve and metering pump, liquid magnesium alloy is extracted from the vacuum furnace for testing and to determine whether it meets the requirements for high-purity magnesium. If it meets the requirements, the electronically controlled valve and metering pump are shut down, and the qualified magnesium melt enters the forming mold for a rhythmic ingot casting process. The ingot casting process includes the following rhythms; F01. The controller starts the geared motor (201), and the module moves laterally by the chain group (2) by a distance equal to the width of the mold, moving the heated ingot mold (214) to the ingot position (204). F02. The mold cavity liquid level probe lifting system (206) drives the liquid level probe to descend a set distance into the mold cavity, and at the same time, the mold cover lifting system (205) drives the mold cover to descend a set distance. F03. The lifting mechanism (1) rises a set distance, the mold cavity of the ingot mold (214) and the pouring pipe (3) are in close contact at the pouring position (204), and the movable pouring at the movable outlet of the pouring pipe is pushed open; F04. The controller opens the protective gas passage vent pipe (208) that is connected to the mold cavity of the ingot mold (214) at the casting position, and performs a process of first venting the mold cavity and then introducing protective gas. F05. The protective gas is maintained at the set pressure. The melt is injected into the mold cavity of the ingot mold (214) under the rotation of the high temperature stirring and casting pump until the liquid level probe of the mold cavity detects that the liquid level has reached the set value. A signal is sent to control the liquid level probe of the mold cavity to rise, the lifting mechanism (1) to fall, the pouring pipe to leave the casting position, and the lifting distance of the lifting mechanism is received and sent to the controller by the upper and lower limit rods (210) of the ingot position and two displacement sensors (211) which are vertically fixed on the lower frame (108) and the upper frame (109). The mold cover lifting system (205) rises, and the module lateral movement chain moves laterally by one mold width again to carry out the next ingot casting cycle. g. If the magnesium liquid composition does not meet the requirements, the appropriate additives are added to the vacuum furnace through the alloy addition port (507) by the controller, and the rotation frequency of the high temperature resistant stirring and casting pump (302) is adjusted to stir the material so that the additives react with the excessive elements and precipitate at the bottom of the furnace. After the material in the vacuum furnace is kept still for 10±3 (min), the metering pump is turned on to take liquid to meet the composition requirements and proceed to step "f".

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnesium ingot vacuum atmosphere production line and production method, comprising a closed ingot casting machine, a vacuum furnace and a vacuum feeding hopper, a pouring pipe connecting the vacuum furnace and the closed ingot casting machine, and a production method for casting ingots according to a fixed rhythm.

2. The magnesium ingot vacuum atmosphere production line and production method according to claim 1, characterized in that, The sealed ingot casting machine includes a lifting mechanism (1), a module transverse moving chain (2), and an ingot mold sealing protection system (111). The lifting mechanism (1) includes three lifting hydraulic cylinders (101) fixed on the lower frame (108) and connecting rods (105) via rotating joints, an oil tank (103), several rotating joints (102), and a control system (not shown). Two pairs of connecting rods (105) and connecting rod two (104) are connected by rotating joints (102), and two pairs of rollers (106). The control system controls the movement of the lifting hydraulic cylinders (101) to drive the rollers (106) to slide on the roller track (107) to achieve close contact and separation between the sealed ingot casting machine and the pouring pipe (3) at the ingot mold position (204). The ingot mold sealing protection system (111) includes a mold cover lifting system (205) fixed on the frame (209). Mold cavity liquid level probe lifting system (206), protective air passage vent pipe (208), ingot position upper and lower limit rods (210), displacement sensor x2 (211).

3. The magnesium ingot vacuum atmosphere production line and production method according to claim 2, characterized in that, The enclosed ingot casting machine also includes two sets of module transverse moving chains (2) fixed on the frame (209), including a geared motor (201) and a coupling (202) connected to its output shaft, two pairs of sprockets ×4 (203) installed at the outlet and inlet of the moving chain and sprocket shaft (207), several roller units (204) for installing ingot molds (214) and two upper and lower roller tracks (216) for the roller units to roll, and a heating cover (212). The motor (202) rotates and drives a pair of sprockets (203) at the outlet of the moving chain to rotate. The roller unit (213) and the sprockets (203) form a chain drive. During the casting process, the ingot mold (204) is first moved to the heating cover (212) for heating according to the design rhythm, and then transported to the pouring position (204) to wait for ingot casting.

4. The magnesium ingot vacuum atmosphere production line and production method according to claim 1, characterized in that, The vacuum furnace consists of an outer layer (504) and a middle crucible (502) layer. A heating layer (503) is provided between the outer layer and the crucible layer. The furnace body sealing cover (501) has an alloy addition port (507), a pouring pipe installation port (508), a high-temperature casting pump installation port (509), a protective gas inlet (510), a thermocouple installation port (511), a liquid level probe installation port (512), a furnace heating electric unit connection bar (513), an oil leakage detection probe (514), an electrical box (515), a furnace pressure detection element installation port (4101), a furnace vacuum pump inlet (516), a vacuum feeding hopper installation port (517), and a control valve and metering pump installation port (518). These installation ports are used to install components associated with the vacuum furnace and to maintain the sealing and heat insulation of each installation port.

5. The magnesium ingot vacuum atmosphere production line and production method according to claim 1, characterized in that, The vacuum feeding chamber (4) has a double-layer hollow tube structure. The hollow tube wall of the feeding chamber has a vacuum pump system ball valve installation port (409) and a protective gas ball valve installation port (410) for installing the corresponding ball valves. Opening or closing the corresponding ball valves connects or disconnects the vacuum pump and protective gas source. The hollow tube of the feeding chamber also has a vacuum gate valve installation port, an insulation door installation port, and a tilting door installation port. These installation ports are used to install the feeding chamber rotating door and its drive assembly (401), and the vacuum gate valve and its drive assembly (404). The compartment door and its drive assembly (405) are installed on the charging hopper or vacuum furnace sealing cover by the corresponding mounting brackets, and drive the corresponding valve (4041), compartment door (4051) and flip door (4081) to enter and exit the charging hopper. The charging hopper is a hollow tube and the charging hopper is divided into four sections from top to bottom: charging section (402), heat insulation section, vacuum heat insulation section and furnace entry section. This segmented design controls the preheating of magnesium ingots as much as possible and avoids heat loss due to the mixing of charging air and fluctuation of the liquid level in the furnace.

6. The magnesium ingot vacuum atmosphere production line and production method according to claim 1, characterized in that, The casting pipe (3) is fixed to the vacuum furnace body by the casting pipe support frame (301), including an outer pipe (303) and an inner pipe (304). The inlet of the inner pipe (304) is connected to the outlet of the high-temperature stirring casting pump (302) installed on the sealing cover. The outlet of the inner pipe (304) is equipped with a movable nozzle. The movable nozzle of the ingot position (204) is pushed open by the ingot mold (214). The melt in the vacuum furnace is rotated by the high-temperature stirring casting pump (302) and enters the mold cavity to cast ingot through the inner pipe channel of the casting pipe.

7. The magnesium ingot vacuum atmosphere production line and production method according to claim 1, characterized in that, The production method for casting ingots according to a fixed rhythm includes the following steps: a. By controlling the vacuum ball valve switch of the vacuum furnace and vacuum feeding hopper through the controller, the external vacuum pump is controlled to perform vacuum treatment inside the vacuum furnace and feeding hopper. The vacuum degree is detected by the element installed at the pressure detection element installation port (4101) in the furnace and is not higher than 0.1Pa. b. During the initial feeding, the feed inlet of the feeding hopper and the various doorways are opened by the control process, so that the high-purity magnesium metal can automatically fall into the crucible of the vacuum furnace. During the production process, the feeding is done according to the production rhythm. Magnesium ingots are fed into the vacuum chamber through the valve at the feed port (401) of the vacuum chamber. The fed magnesium ingots stop and preheat at the vacuum gate valve (4041), the partition door (4051) and the flip door (4081) according to the rhythm before sliding into the crucible of the vacuum furnace. Generally, the amount of magnesium ingots in the crucible is kept at 200±10 (kg). c. The vacuum valve and vacuum gate valve are closed by controlling the process through the controller, and the external inert gas source is controlled to fill the vacuum furnace and the charging hopper with inert gas through the inert gas inlet until the pressure of the inert gas in the vacuum furnace is about 0.1 MPa. d. The main heating component and resistance wire are controlled by the controller to heat the material in the vacuum furnace. The temperature rises to 750±20 (°C) to melt the high-purity magnesium ingot. At the same time, the casting pipe (3) of the production line and the sealed ingot casting machine are started for preheating. e. The rotation frequency of the internal stirring pump is adjusted by the controller to stir the material for 5±1 (min). f. By controlling the electronically controlled valve and metering pump, liquid magnesium alloy is extracted from the vacuum furnace for testing and to determine whether it meets the requirements for high-purity magnesium. If it meets the requirements, the electronically controlled valve and metering pump are shut down, and the qualified magnesium melt enters the forming mold for a rhythmic ingot casting process. The ingot casting process includes the following rhythms; F01. The controller starts the geared motor (201), and the module moves laterally by the chain group (2) by a distance equal to the width of the mold, moving the heated ingot mold (214) to the ingot position (204). F02. The mold cavity liquid level probe lifting system (206) drives the liquid level probe to descend a set distance into the mold cavity, and at the same time, the mold cover lifting system (205) drives the mold cover to descend a set distance. F03. The lifting mechanism (1) rises a set distance, the mold cavity of the ingot mold (214) and the pouring pipe (3) are in close contact at the pouring position (204), and the movable pouring at the movable outlet of the pouring pipe is pushed open; F04. The controller opens the protective gas passage vent pipe (208) that is connected to the mold cavity of the ingot mold (214) at the casting position, and performs a process of first venting the mold cavity and then introducing protective gas. F05. The protective gas is maintained at the set pressure. The melt is injected into the mold cavity of the ingot mold (214) under the rotation of the high temperature stirring and casting pump until the liquid level probe of the mold cavity detects that the liquid level has reached the set value. A signal is sent to control the liquid level probe of the mold cavity to rise, the lifting mechanism (1) to fall, the pouring pipe to leave the casting position, and the lifting distance of the lifting mechanism is received and sent to the controller by the upper and lower limit rods (210) of the ingot position and two displacement sensors (211) which are vertically fixed on the lower frame (108) and the upper frame (109). The mold cover lifting system (205) rises, and the module lateral movement chain moves laterally by one mold width again to carry out the next ingot casting cycle. g. If the magnesium liquid composition does not meet the requirements, the appropriate additives are added to the vacuum furnace through the alloy addition port (507) by the controller, and the rotation frequency of the high temperature resistant stirring and casting pump (302) is adjusted to stir the material so that the additives react with the excessive elements and precipitate at the bottom of the furnace. After the material in the vacuum furnace is kept still for 10±3 (min), the metering pump is turned on to take liquid to meet the composition requirements and proceed to step "f".

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