Magnesium alloy counter-pressure casting equipment capable of preventing magnesium alloy from oxidizing combustion

Abstract

The invention provides magnesium alloy counter-pressure casting equipment for preventing magnesium alloy oxidative combustion. The magnesium alloy counter-pressure casting equipment structurally comprises a casting assistor, a positioning box, a smelting furnace, a feeding cavity, a vacuumizing main switch and a shielding gas injection main switch. After the casting assistor is further improved, the sealing cover can be driven to move up and down through a connecting frame on an electrified positioning block by utilizing an electric sliding block of a guide sliding rod, so that the tight airtightness of a feeding cavity is improved, continuous invasion of oxygen is prevented, and then the casting assistor is connected with equipment with other metal elements by utilizing a vertical pipe; by means of the casting mold module at the lower end of the sealing cover, other elements can be stably added into the smelting furnace in the magnesium alloy casting process, the casting strength of the magnesium alloy is improved, and then the magnesium alloy can be cast through the casting mold module at the lower end of the sealing cover after liquid magnesium alloy casting is completed; therefore, the casting and casting efficiency and stability of the magnesium alloy component can be improved, and slag inclusion generated by oxidative combustion can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of casting equipment, and more specifically to a differential pressure casting equipment for magnesium alloy to prevent oxidation and combustion of magnesium alloy. Background Art

[0002] Magnesium alloy is an alloy composed of magnesium as the base and other elements added. It has the characteristics of low density, high strength, large elastic modulus, good heat dissipation, and good shock absorption. Therefore, when casting complex thin-walled magnesium alloy components, a special casting equipment needs to be used for counter-gravity low-pressure casting method to manufacture, so as to improve the stability of magnesium alloy and prevent the occurrence of secondary oxidation and slag inclusion of magnesium alloy; In summary, the inventor found that the existing casting equipment mainly has the following defects: Since other elements need to be combined during the casting of magnesium alloy, it is difficult for the current casting equipment to add other elements during the casting process, which easily causes insufficient casting and insufficient strength; Then after the main body of the magnesium alloy is cast, it is difficult for the current equipment to perform mold casting on it at the origin. As a result, the liquid magnesium alloy needs to be taken out of the equipment and then moved secondarily into the corresponding mold casting machine. Therefore, when taking out and moving, it will contact with space impurities, which will affect the purity of the overall magnesium alloy, reducing the convenience of magnesium alloy mold casting and the stability after mold casting. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical purpose is: A differential pressure casting equipment for magnesium alloy to prevent oxidation and combustion of magnesium alloy, the structure of which includes: a casting auxiliary device, a positioning box, a melting furnace, a feeding cavity, a vacuum pumping main valve, a protective gas injection main valve. The casting auxiliary device is installed above the feeding cavity of the melting furnace through the positioning box, and the melting furnace is embedded inside the positioning box for positioning connection. The vacuum pumping main valve carries an exhaust pipe through the positioning box and is connected to the right side of the melting furnace. The protective gas injection main valve also carries a pipe body through the left side of the positioning box and is connected to the left side of the melting furnace.

[0004] As a further improvement of the present invention, the casting auxiliary device is provided with a guiding slide rod. The guiding slide rod vertically penetrates through the protruding central area of the connecting frame, and the lower end also penetrates through the center of the sealing cover and is the same as the mold casting module. The lower end of the connecting frame is fixed with an energized positioning block to complete the fixed connection with the upper end of the positioning box.

[0005] As a further improvement of the present invention, the guiding sliding rod is provided with a first parallel block. Below the first parallel block, it is on the same vertical center line as the second parallel block, and at the left and right ends of the second parallel block, there are connecting pieces to complete the connection with the center of the upper end of the sealing cover, enabling the vertical pipe to be vertically embedded in the inner center of the sealing cover. The first parallel block is arranged in the protruding central area of the connecting frame and its center is also penetrated by the vertical pipe. On the left and right sides of the vertical pipe, there are electric sliders to drive the sealing cover of the second parallel block to slide up and down in the central area of the first parallel block.

[0006] As a further improvement of the present invention, through the casting auxiliary device on the positioning box, the vertical pipe in the guiding sliding rod can be connected to the equipment with metal elements. Then, the electric slider drives the second parallel block, and the sealing cover fixed by the connecting piece covers the feeding cavity, so that the casting module of the sealing cover can enter the melting furnace for internal positioning. Finally, the air inside the melting furnace is intervened by the vacuum pumping main valves and the protective gas injection main valves on the left and right sides.

[0007] As a further improvement of the present invention, the positioning box completely covers and positions the edge of the melting furnace, and the feeding cavity of the melting furnace is opened vertically and is on the same vertical line as the casting auxiliary device. The vacuum pumping main valve and the protective gas injection main valve are respectively arranged on the left and right sides of the melting furnace and are equipped with airtight pipes.

[0008] As a further improvement of the present invention, the energized positioning block is perpendicular to the lower end of the connecting frame, and hidden wires are arranged inside the connecting frame. The connecting frame is in an "L" shape, and the guiding sliding rod and the sealing cover form a "T" shape. The casting module is arranged vertically on the lower side of the sealing cover and its melting point is higher than 160 °C.

[0009] As a further improvement of the present invention, the first parallel block and the second parallel block have the same length. The first parallel block is fused to the center of the upper end of the sealing cover by welding. The second parallel block is connected to the center of the upper layer of the sealing cover through the bolts and convex blocks of two groups of connecting pieces. The outside of the vertical pipe is made of carbon steel and there is an air guiding cavity inside. The electric sliders on the left and right sides are used to drive the up and down sliding of the sealing cover.

[0010] As a further improvement of the present invention, the top of the vertical pipe is provided with a connecting frame. The center of the connecting frame is penetrated by a through groove, and the heat insulation plate inside the through groove penetrates through the side center part of the connecting frame and is externally connected with a control pull block. The area where the control pull block contacts the connecting frame is connected with an adsorption block embedded in the side area of the connecting frame.

[0011] As a further improvement of the present invention, two square slots are opened in the contact area between the connecting frame and the adsorption block of the control pull block, and the heat insulation plate in the internal through groove is perpendicular to the control pull block.

[0012] As a further improvement of the present invention, the casting module is provided with a pressure member, which vertically penetrates through the upper edge of the hot work die steel and communicates with the internal connection groove and the die plate. An energized plug is also arranged at the upper edge of the hot work die steel to cooperate with the upper end of the pressure member at a certain distance.

[0013] As a further improvement of the present invention, the energized plug is in a "T" shape and is distributed oppositely at the upper edge of the hot work die steel with a certain distance from the pressure member. The connection groove is square-shaped to define the edge of the die plate.

[0014] As a further improvement of the present invention, the pressure member is provided with a moving block, which is installed on the left and right sides of the high-temperature resistant frame and is in vertical contact with the inner wall of the hot work die steel. The inside of the high-temperature resistant frame is connected to the blocking plate. A folding member is also connected to the center of the front end of the blocking plate, and the pressure plate is fixedly connected through the front end of the folding member.

[0015] As a further improvement of the present invention, the materials of the moving block, the high-temperature resistant frame, the blocking plate, the folding member, and the pressure plate are the same as that of the hot work die steel, and their melting points are all higher than 160°C.

[0016] As a further improvement of the present invention, the die plate is provided with connecting bumps, which are welded to the four end regions of the edge of the plate body, and the plate body positions the connecting buckle through the contact layer. A restraint groove is also opened in the connecting region between the connecting buckle and the contact layer.

[0017] As a further improvement of the present invention, the connecting bumps are square-shaped and one is provided at each of the four ends of the edge of the plate body. Five groups of connecting buckles and restraint grooves are arranged on the contact layer of the plate body.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. After the present invention is further improved by the casting assistor, the connecting frame on the energized positioning block can drive the sealing cover to move up and down by the electric slider of the guiding slide rod, improving the tight airtightness of the feeding cavity, preventing continuous intrusion of oxygen, and then connecting with the equipment with other metal elements through the vertical pipe, so that other elements can be stably added into the melting furnace during the magnesium alloy casting process, improving the casting strength of the magnesium alloy. Furthermore, after the liquid magnesium alloy casting is completed, the casting module at the lower end of the sealing cover can be used to cast the magnesium alloy, thereby improving the casting and molding efficiency and stability of the magnesium alloy components and preventing slag inclusion caused by oxidation combustion.

[0019] 2. After the upper end of the vertical tube of the present invention is further improved, it can be effectively connected to the pipelines of other devices through the connecting frame. Then, other metal elements are transported through the internal through groove. After the metal elements are transported, the heat insulation plate can be pushed by controlling the pulling block to cover and close the through groove area, so as to effectively prevent the high temperature inside the melting furnace from affecting the constant temperature state of other devices through the vertical tube, and further avoid the reduction of the casting stability of magnesium alloy caused by the loss of internal temperature.

[0020] 3. After the casting module of the present invention is further improved, based on the melting point of the hot work die steel being higher than 160 °C, when it enters the melting furnace through the sealing cover, it will not be affected by the temperature during the casting of magnesium alloy. Since the casting temperature of magnesium alloy is only between 70 °C and 150 °C, after the heat-resistant magnesium alloy casting is completed, it can be directly cast through the internal die plate. Then, the folding part of the pressure member and the extending property of the pressure plate can effectively improve the casting strength and stability of magnesium alloy.

[0021] 4. After the pressure member of the present invention is further improved, during the casting of magnesium alloy, the blocking plate of the pressure member covers the die plate and the connection groove area to prevent the magnesium alloy during casting from invading into the connection groove and directly contacting the die plate, avoiding the incomplete cast magnesium alloy directly entering the casting area and reducing the subsequent casting strength. Then, after the magnesium alloy casting is completed, the moving block of the pressure member will drive the whole high-temperature resistant frame to slide upward to the sealing cover, releasing the connection between the groove, the die plate and the magnesium alloy. After the magnesium alloy fills the die plate, the moving block drives the high-temperature resistant frame to reset, and then the folding part is used to push the pressure plate to apply casting pressure to the magnesium alloy on the die plate, improving the casting strength of magnesium alloy. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a differential pressure casting device for magnesium alloy to prevent oxidation and combustion of magnesium alloy.

[0023] Figure 2 It is a schematic three-dimensional structural diagram after the improvement of a casting auxiliary device.

[0024] Figure 3 It is a schematic sectional view after the improvement of a guiding slide bar.

[0025] Figure 4 It is a schematic top view after the improvement of the upper part of the vertical tube.

[0026] Figure 5 It is a schematic three-dimensional structural diagram after the improvement of a casting module.

[0027] Figure 6 It is a schematic three-dimensional structural diagram after the improvement of a pressure member.

[0028] Figure 7 It belongs to a schematic cross-sectional structure diagram of an improved mold plate.

[0029] In the figure: casting assistant - 1, positioning box - 2, melting furnace - 3, feeding cavity - 4, vacuum pumping main valve - 5, protective gas injection main valve - 6; Power-on positioning block - 11, connecting frame - 12, guiding slide rod - 13, sealing cover - 14, casting mold module - 15; Parallel block 1 - 131, parallel block 2 - 132, connecting piece - 133, vertical pipe - 134, electric slider - 135; Connecting border - 1341, through groove - 1342, heat insulation plate - 1343, control pull block - 1344, adsorption block - 1345; Power-on insertion block - 151, hot work die steel - 152, connecting groove - 153, mold plate - 154, pressure member - 155; Moving block - 1551, high-temperature resistant frame - 1552, blocking plate - 1553, folding piece - 1554, pressure plate - 1555; Connecting convex block - 1541, plate body - 1542, contact layer - 1543, connecting buckle - 1544, restraint groove - 1545. Specific implementation mode

[0030] The present invention will be further described below in conjunction with the accompanying drawings: Embodiment

[0031] Figures 1 to 4 As shown: The present invention provides a differential pressure casting device for magnesium alloy to prevent oxidation and combustion of magnesium alloy, whose structure includes a casting assistant 1, a positioning box 2, a melting furnace 3, a feeding cavity 4, a vacuum pumping main valve 5, and a protective gas injection main valve 6. The casting assistant 1 is installed above the feeding cavity 4 of the melting furnace 3 through the positioning box 2, and the melting furnace 3 is embedded inside the positioning box 2 for positioning connection. The vacuum pumping main valve 5 carries an exhaust pipe through the positioning box 2 and is connected to the right side of the melting furnace 3, and the protective gas injection main valve 6 also carries a pipe body through the left side of the positioning box 2 and is connected to the left side of the melting furnace 3.

[0032] Among them, the casting assistant 1 is provided with a guiding slide rod 13. The guiding slide rod 13 vertically penetrates the protruding central area of the connecting frame 12, and the lower end also penetrates the center of the sealing cover 14 and is the same as the casting mold module 15. The lower end of the connecting frame 12 is fixed with a power-on positioning block 11 to complete the fixed connection with the upper end of the positioning box 2.

[0033] Among them, the guiding slide bar 13 is provided with a first parallel block 131. Below the first parallel block 131, it is on the same vertical center line as the second parallel block 132, and connecting pieces 133 are arranged at the left and right ends of the second parallel block 132 to complete the connection with the center of the upper end of the sealing cover 14, enabling the vertical pipe 134 to be vertically embedded in the inner center of the sealing cover 14. The first parallel block 131 is arranged in the protruding central area of the connecting frame 12, and its center is also penetrated by the vertical pipe 134. Electric sliders 135 are arranged on both the left and right sides of the vertical pipe 134 to drive the sealing cover 14 of the second parallel block 132 to slide up and down in the central area of the first parallel block 131.

[0034] Among them, through the casting auxiliary device 1 on the positioning box 2, the vertical pipe 134 in the guiding slide bar 13 can be connected to the equipment with metal elements. Then, the electric slider 135 drives the second parallel block 132, and the sealing cover 14 fixed by the connecting piece 133 covers the feeding cavity 4, so that the casting module 15 of the sealing cover 14 can enter the melting furnace 3 for internal positioning. Finally, the air inside the melting furnace 3 is intervened by the vacuum pumping main valve 5 and the protective gas injection main valve 6 on both sides.

[0035] Among them, the positioning box 2 completely covers and positions the edge of the melting furnace 3, and the feeding cavity 4 of the melting furnace 3 is opened vertically and is on the same vertical line as the casting auxiliary device 1. The vacuum pumping main valve 5 and the protective gas injection main valve 6 are respectively arranged on the left and right sides of the melting furnace 3 and are equipped with airtight pipes.

[0036] Among them, the energized positioning block 11 is perpendicular to the lower end of the connecting frame 12, and hidden wires are arranged inside the connecting frame 12. The connecting frame 12 is in an "L" shape, and the guiding slide bar 13 and the sealing cover 14 form a "T" shape. The casting module 15 is arranged vertically at the lower side of the sealing cover 14, and its melting point is higher than 160 °C.

[0037] Among them, the first parallel block 131 and the second parallel block 132 have the same length. The first parallel block 131 is welded to the center of the upper end of the sealing cover 14. The second parallel block 132 is connected to the upper center of the sealing cover 14 through the bolts and bumps of two groups of connecting pieces 133. The outside of the vertical pipe 134 is made of carbon steel and has an air guiding cavity inside. The electric sliders 135 on both sides are used to drive the sealing cover 14 to slide up and down.

[0038] Among them, the top of the vertical pipe 134 is provided with a connection frame 1341. The center of the connection frame 1341 is penetrated by a through groove 1342, and the heat insulation plate 1343 inside the through groove 1342 penetrates through the side center of the connection frame 1341 and is externally connected with a control pull block 1344. An adsorption block 1345 is connected to the area where the control pull block 1344 contacts the connection frame 1341 and is embedded in the side area of the connection frame 1341.

[0039] Among them, two square slots are opened in the contact area between the connection frame 1341 and the adsorption block 1345 of the control pull block 1344, and the heat insulation plate 1343 of the internal through groove 1342 is perpendicular to the control pull block 1344.

[0040] Specific functions and operation processes of this embodiment: In the present invention, the casting equipment can determine the position of the melting furnace 3 through the positioning box 2. Then, the melting furnace 3 can be connected to the vacuum extraction main valve 5 and the protective gas injection main valve 6 on the left and right through the positioning box 2. Subsequently, the magnesium alloy main body is loaded into the melting furnace 3 by using the casting auxiliary device 1 and the feeding cavity 4 at the upper end. When the energized positioning block 11 of the casting auxiliary device 1 energizes the guiding slide rod 13 of the connecting frame 12, the guiding slide rod 13 can complete the fixed connection with the sealing cover 14 through the connecting member 133 of the parallel block two 132. When the vertical pipe 134 passes through the electric slider 135 and is energized with the energized positioning block 11, the height of the sealing cover 14 can be adjusted to cover the feeding cavity 4. At the same time, the casting mold module 15 is sent into the melting furnace 3. For this reason, based on the fact that the melting point of the casting mold module 15 is higher than 160 °C, it will not be affected by the temperature during the melting of the magnesium alloy. Therefore, when the magnesium alloy is melted in the melting furnace 3 (during the process, the vacuum extraction main valve 5 can guide the oxygen inside the melting furnace 3, and the protective gas injection main valve 6 at the other end can inject argon to achieve a protective effect. According to the characteristic that argon is insoluble in liquid metal at high temperatures, it can effectively protect the melting stability of the magnesium alloy and prevent slag inclusion caused by oxidation and combustion), the upper end of the vertical pipe 134 of the guiding slide rod 13 can be connected to the equipment with other metal elements through the connection frame 1341. Then, the control pull block 1344 controls the heat insulation plate 1343 to open the through groove 1342, so that other metal elements can enter the melting furnace 3 through the conveying method and be fused with the magnesium alloy, enabling other elements to be added to the magnesium alloy during casting. After the addition of other metal elements is completed, the control pull block 1344 can push the heat insulation plate 1343 to close the through groove 1342 again. At the same time, the adsorption block 1345 adsorbs on the side of the connection frame 1341 to avoid the situation of the heat insulation plate 1343 being loose and unstable, ensuring the stability of the temperature inside the melting furnace 3 and preventing the temperature from dropping and reducing the casting strength of the magnesium alloy. Furthermore, after the magnesium alloy casting is completed, the casting mold module 15 on the side of the lower end of the sealing cover 14 can be used for origin casting, so as to improve the convenience of the magnesium alloy casting mold. Embodiment

[0041] Figures 5 to 7 As shown: The present invention provides a differential pressure casting equipment for magnesium alloy to prevent oxidation and combustion of magnesium alloy, Its structure includes that the casting module 15 is provided with a pressure member 155. The pressure member 155 vertically penetrates through the upper edge of the hot work die steel 152 and communicates with the internal connection groove 153 and the die plate 154. An energized plug 151 is also arranged at the upper edge of the hot work die steel 152 and is in spacing cooperation with the upper end of the pressure member 155.

[0042] Among them, the energized plug 151 is in a "T" shape and there is a spacing between it and the pressure member 155, and they are distributed oppositely at the upper edge of the hot work die steel 152. The connection groove 153 is in a square shape to define the edge of the die plate 154.

[0043] Among them, the pressure member 155 is provided with a moving block 1551. The moving block 1551 is installed on the left and right sides of the high-temperature resistant frame 1552 and is in vertical contact with the inner wall of the hot work die steel 152. The inside of the high-temperature resistant frame 1552 is connected to the blocking plate 1553. The center of the front end of the blocking plate 1553 is also connected to a folding member 1554, and the pressure plate 1555 is fixedly connected through the front end of the folding member 1554.

[0044] Among them, the materials of the moving block 1551, the high-temperature resistant frame 1552, the blocking plate 1553, the folding member 1554, and the pressure plate 1555 are the same as that of the hot work die steel 152, and their melting points are all higher than 160 °C.

[0045] Among them, the die plate 154 is provided with a connecting convex block 1541. The connecting convex block 1541 is welded to the four end regions of the edge of the plate body 1542, and the plate body 1542 positions the connecting buckle 1544 through the contact layer 1543. A restraint groove 1545 is also opened in the connection area between the connecting buckle 1544 and the contact layer 1543.

[0046] Among them, the connecting convex block 1541 is in a square shape and there is one on each of the four ends of the edge of the plate body 1542. There are five groups of connecting buckles 1544 and restraint grooves 1545 on the contact layer 1543 of the plate body 1542.

[0047] The specific functions and operation processes of this embodiment: In the present invention, the hot work die steel 152 of the casting module 15, the high-temperature resistant frame 1552 and other accessories all have a melting point higher than 160°C, and the overall material is the same as that of the hot work die steel 152. Then, the hot work die steel 152 can be connected to the lower end of the sealing cover 14 through the "T"-shaped power-on insertion block 151 at the upper end, and then electrically connected to the melting furnace 3 through the buried circuit inside. Subsequently, when the magnesium alloy is cast in the melting furnace 3, the connection groove 153 of the hot work die steel 152 and the die plate 154 can be covered by the pressure member 155 to prevent the magnesium alloy from invading the connection groove 153 and contacting the die plate 154 during the casting process. After the magnesium alloy casting is completed, the moving block 1551 at the edge of the high-temperature resistant frame 1552 of the pressure member 155 can be electrically controlled by the relevant controller through the electrical connection effect between the power-on insertion block 151 and the melting furnace 3, so that it can slide vertically in the inner wall area of the hot work die steel 152 and penetrate the surface layer of the sealing cover 14, so that the connection groove 153 and the die plate 154 can be released. Then, the magnesium alloy will enter the inside of the connection groove 153 and contact the die plate 154. After the die plate 154 is filled with the magnesium alloy, the moving block 1551 will move downward again, use the blocking plate 1553 to cover the connection groove 153, and then use a dedicated controller to lower the temperature of the melting furnace 3. Then, control the folding member 1554 inside the blocking plate 1553 to push the pressure plate 1555 to apply a corresponding casting pressure to the surface layer of the die plate 154, so as to effectively improve the casting convenience after the magnesium alloy casting is completed, replacing the original method of taking out the magnesium alloy and then putting it into the corresponding casting equipment again for forming, improving the production efficiency of magnesium alloy accessories. Subsequently, the plate body 1542 of the die plate 154 can be installed inside the hot work die steel 152 through the connection convex block 1541, so that the plate body 1542 can be stably engaged and connected with the back of the die of the relevant shape through the five groups of connection grooves 1544 and restraint grooves 1545 on the contact layer 1543, so as to improve the replacement and use effects of dies of different shapes and improve the use convenience of the overall components.

[0048] Any technical solution using the technical solution of the present invention, or designed by those skilled in the art under the inspiration of the technical solution of the present invention to achieve the above technical effects, falls within the protection scope of the present invention.

Claims

1. A differential pressure casting device for magnesium alloy to prevent oxidation and combustion of magnesium alloy, the structure of which includes: Casting assistor (1), positioning box (2), smelting furnace (3), charging cavity (4), vacuum pumping main valve (5), protective gas injection main valve (6), the casting assistor (1) is installed above the charging cavity (4) of the smelting furnace (3) through the positioning box (2), and the smelting furnace (3) is embedded inside the positioning box (2) for positioning connection. The vacuum pumping main valve (5) is equipped with an exhaust pipe passing through the positioning box (2) and connected to the right side of the smelting furnace (3). The protective gas injection main valve (6) is also equipped with a pipe body passing through the left side of the positioning box (2) and connected to the left side of the smelting furnace (3). It is characterized in that: The casting assistor (1) is provided with a guiding slide rod (13), the guiding slide rod (13) vertically penetrates through the protruding central area of the connecting frame (12), and the lower end also penetrates through the center of the sealing cover (14) and is the same as the casting module (15). The lower end of the connecting frame (12) is fixed with an energized positioning block (11) to complete the fixed connection with the upper end of the positioning box (2); The guiding slide rod (13) is provided with a first parallel block (131), the lower part of the first parallel block (131) and a second parallel block (132) are on the same vertical center line, and connecting pieces (133) are arranged at the left and right ends of the second parallel block (132) to complete the connection with the center of the upper end of the sealing cover (14), so that the vertical pipe (134) vertically embeds into the inner center of the sealing cover (14). The first parallel block (131) is arranged in the protruding central area of the connecting frame (12) and the center is also penetrated by the vertical pipe (134). Electric sliders (135) are arranged on the left and right sides of the vertical pipe (134) to drive the sealing cover (14) of the second parallel block (132) to slide up and down in the central area of the first parallel block (131); Through the casting assistor (1) on the positioning box (2), the vertical pipe (134) in the guiding slide rod (13) can be connected to the equipment with metal elements. Then, the electric slider (135) drives the second parallel block (132) to cover the charging cavity (4) through the sealing cover (14) fixed by the connecting piece (133), so that the casting module (15) of the sealing cover (14) can enter the smelting furnace (3) for internal positioning use. Finally, the air inside the smelting furnace (3) is intervened by the vacuum pumping main valve (5) and the protective gas injection main valve (6) on the left and right sides.

2. The differential pressure casting equipment for magnesium alloy to prevent oxidation and combustion according to claim 1, characterized in that: The positioning box (2) completely covers and positions the edge of the smelting furnace (3), and the charging cavity (4) of the smelting furnace (3) is opened in the vertical direction and is on the same vertical line as the casting assistor (1). The vacuum pumping main valve (5) and the protective gas injection main valve (6) are respectively arranged on the left and right sides of the smelting furnace (3) and are equipped with airtight pipes.

3. A differential pressure casting device for magnesium alloy to prevent oxidation and combustion according to claim 1, characterized in that: The energized positioning block (11) is perpendicular to the lower end of the connecting frame (12), and hidden wires are arranged inside the connecting frame (12). The connecting frame (12) is in an "L" shape, and the guiding slide rod (13) and the sealing cover (14) form a "T" shape. The casting module (15) is arranged vertically at the lower side edge of the sealing cover (14) and its melting point is higher than 160 °C.

4. A differential pressure casting device for magnesium alloy to prevent oxidation and combustion of magnesium alloy according to claim 1, characterized in that: The lengths of the first parallel block (131) and the second parallel block (132) are the same. The first parallel block (131) is fused to the center of the upper end of the sealing cover (14) by welding. The second parallel block (132) is connected to the center of the upper layer of the sealing cover (14) through the bolts and bumps of two groups of connecting pieces (133). The outer part of the vertical pipe (134) is made of carbon steel and has an air guiding cavity inside. The electric sliders (135) on the left and right sides drive the up and down sliding of the sealing cover (14).

5. A differential pressure casting device for magnesium alloy to prevent oxidation and combustion of magnesium alloy according to claim 1, characterized in that: The top of the vertical pipe (134) is provided with a connecting frame (1341). The center of the connecting frame (1341) is penetrated by a through groove (1342). The heat insulation plate (1343) inside the through groove (1342) penetrates through the side center part of the connecting frame (1341) and is externally connected with a control pull block (1344). An adsorption block (1345) is connected to the area where the control pull block (1344) contacts the connecting frame (1341) and is embedded in the side area of the connecting frame (1341). Two square slots are opened in the contact area between the connecting frame (1341) and the adsorption block (1345) of the control pull block (1344), and the heat insulation plate (1343) of the internal through groove (1342) is perpendicular to the control pull block (1344).

6. A differential pressure casting device for magnesium alloy to prevent oxidation and combustion of magnesium alloy according to claim 1, characterized in that: The casting module (15) is provided with a pressure member (155). The pressure member (155) vertically penetrates through the upper edge of the hot work die steel (152) and communicates with the internal connection groove (153) and the die plate (154). An energized plug (151) is also arranged at the upper edge of the hot work die steel (152) and has a spacing fit with the upper end of the pressure member (155). The energized plug (151) is in a "T" shape and has a spacing with the pressure member (155) and is distributed oppositely at the upper edge of the hot work die steel (152). The connection groove (153) is square in shape and defines the edge of the die plate (154).

7. A differential pressure casting device for magnesium alloy to prevent oxidation and combustion according to claim 6, characterized in that: The pressure member (155) is provided with a moving block (1551). The moving block (1551) is installed on the left and right sides of the high-temperature resistant frame (1552) and is in vertical contact with the inner wall of the hot work die steel (152). The inside of the high-temperature resistant frame (1552) is connected with a blocking plate (1553). A folding member (1554) is also connected to the center of the front end of the blocking plate (1553), and the pressure plate (1555) is fixedly connected through the front end of the folding member (1554). The materials of the moving block (1551), the high-temperature resistant frame (1552), the blocking plate (1553), the folding member (1554), and the pressure plate (1555) are the same as the material of the hot work die steel (152), and their melting points are all higher than 160 °C.

8. The differential pressure casting equipment for magnesium alloy to prevent oxidation and combustion according to claim 6, characterized in that: The die plate (154) is provided with a connecting convex block (1541). The connecting convex block (1541) is welded to the four end regions of the edge of the plate body (1542), and the plate body (1542) positions the connecting buckle (1544) through the contact layer (1543). A restraint groove (1545) is also opened in the connection area between the connecting buckle (1544) and the contact layer (1543). The connecting bump (1541) is square-shaped and is provided with one piece at each of the four ends of the edge of the plate body (1542). Five groups of connecting buckles (1544) and restraint grooves (1545) are arranged on the contact layer (1543) of the plate body (1542).

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