Vacuum degassing device and technological process thereof

Abstract

The vacuum degassing device comprises a box body, an opening is formed in the top face of the box body, a lifting heating device is installed at the opening in a matched mode, a negative pressure detection device is arranged on the box body beside the opening, a horizontal flow groove is formed in the back position of the box body, and meanwhile a first gate plate and a second gate plate which are spaced and provided with encoders are installed on the flow groove; a dust removal device and a vacuum generation device are installed on one side of the box body, a liquid level detection device is further installed on one side of the box body, a rocker arm is installed on the other side of the box body through a supporting frame, the end of the rocker arm is fixed to the middle of the top face of the door cover, the front end face of the box body is open, and the opening and the door cover are sealed through a sealing device. A baffle is fixed to the middle of the bottom inside the box body, a distance is reserved between the top face of the baffle and the inner top face of the box body, graphite spinors are installed on the two sides of the baffle respectively, and spinor driving devices of the graphite spinors are arranged on the bottom face of the box body. And the degassing effect is improved, and the quality of aluminum processing products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum melting and casting equipment, in particular to a vacuum degassing device and a process flow thereof. Background Art

[0002] Aluminum processing is the process of processing aluminum billets into materials using plastic processing methods. The main methods include rolling, extrusion, stretching and forging. Aluminum processing began to be produced industrially in the early 20th century. Before the 1930s, the production equipment was basically the same as copper processing, and the products were mainly used in aircraft manufacturing. After the 1960s, aluminum production developed rapidly, with an annual growth of about 4-8%. The products are widely used in aviation, construction, transportation, electrical, chemical, packaging and daily necessities industries, and the output is second only to steel.

[0003] In order to obtain higher quality aluminum processed products, it is necessary to control from the source and add a degassing device before the casting equipment to remove impurities in the aluminum liquid.

[0004] The degassing device in the prior art is usually equipped with a manually detachable hair dryer for heating. The liquid storage box is relatively large, and only ordinary fiber rope is used to seal the box and the box cover. A graphite rotor is inserted from the top for stirring, so that the inert bubbles are fully in contact with the aluminum liquid, thereby removing impurities in the aluminum liquid and achieving the effect of improving the quality of the aluminum liquid.

[0005] However, this degassing equipment has the following disadvantages:

[0006] 1. The hair dryer heating method used has unsatisfactory heating effect and needs to be manually removed during casting;

[0007] 2. The sealing conditions are not ideal, and the upper surface of the aluminum liquid is directly in contact with the air;

[0008] 3. The graphite rotor is inserted from the top. When the rotor rotates, it is easy to form a vortex on the liquid surface, which brings the oxides floating on the surface of the aluminum liquid into the aluminum liquid, forming new impurities;

[0009] 4. The new oxide impurities have a high hardness and rub against the rotor, which can easily damage the rotor;

[0010] 5. The speed of the graphite rotor should not be too fast, which will result in insufficient contact between the inert bubbles and the aluminum liquid and fail to achieve the ideal hydrogen removal effect. Summary of the invention

[0011] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a vacuum degassing device with a reasonable structure and its process flow, so as to improve the degassing effect and improve the quality of aluminum processed products.

[0012] The technical solution adopted by the present invention is as follows:

[0013] A vacuum degassing device comprises two bases distributed at intervals, wherein a box body is installed on the upper part of the base body, an opening is provided on the top surface of the box body, a lifting and heating device is installed at the opening, a negative pressure detection device is provided on the box body next to the lifting and heating device, a horizontal flow trough is provided at the back of the box body, a filling port A and a filling port B are provided on the flow trough, and a gate plate No. 1 and a gate plate No. 2 with an encoder are installed on the flow trough at intervals; a dust removal device and a vacuum generating device are installed on one side of the box body, a liquid level detection device is also installed on one side of the box body, a rocker arm is installed on the other side of the box body through a supporting frame, the end of the rocker arm is fixed to the middle position of the top surface of the door cover, the front end surface of the box body is open, and the open opening and the door cover are sealed by a sealing device; a baffle is fixed at the middle position at the bottom of the box body, a distance is left between the top surface of the baffle plate and the inner top surface of the box body, graphite rotors are installed on both sides of the baffle plate, and a rotor driving device of the graphite rotor is provided on the bottom surface of the box body.

[0014] As a further improvement of the above technical solution:

[0015] The box body adopts a space-type shell structure, and an inner cavity is formed inside the box body after the door cover is closed.

[0016] The structure of the lifting and heating device is as follows: it includes a sliding frame, a sliding block is installed in the sliding frame, two vertical guide wheels are respectively arranged on both sides of the sliding block, and a lateral guide wheel is installed between the two vertical guide wheels on one side; a lifting electric cylinder is installed under the sliding frame, the shaft head of the lifting electric cylinder passes through the bottom of the sliding frame and is fixed to the sliding block, the back of the sliding block is fixed to the lifting plate through a connecting plate, and mounting holes are respectively opened at the four corners of the lifting plate, heating rods are installed in the mounting holes, and the four heating rods extend into the interior of the box, and clamping devices are respectively arranged on both sides of the lifting plate.

[0017] The structure of a single clamping device is as follows: it includes a clamping cylinder fixed on the top surface of the box body, a locking plate with a right-angle structure is fixed on the output end of the clamping cylinder, and the locking plate matches the end surface of the lifting plate to be clamped and sealed.

[0018] The sliding frame is locked on the back side of the box body through a fixing plate.

[0019] A V-shaped sealing gasket is installed at the connection between the installation hole and the heating rod through a clamping ring, and a high-temperature sealing ring is installed under the lifting plate, and the high-temperature sealing ring is sealed with the opening of the box body.

[0020] The structure of the door cover is as follows: it comprises an outer shell, a fire-resistant lining is installed on the inner side of the outer shell, a fiber sealing pad is installed on the outer side of the fire-resistant lining, and a high-temperature resistant sealing ring is installed on the outer side of the fiber sealing pad.

[0021] The refractory lining is a hard seal, and the high temperature resistant sealing ring and fiber sealing pad are soft seals.

[0022] A liquid level meter is installed in the flow trough.

[0023] A process flow of a vacuum degassing device includes the following operation flow:

[0024] Step 1: Preparation;

[0025] Check the door cover to make sure the sealing device on the door cover is intact, then close the door cover;

[0026] Start the lifting electric cylinder to insert the heating rod into the inner cavity of the box to heat the internal refractory material; then the pressing cylinder of the pressing device is activated to make the locking plate press down the lifting plate to ensure the sealing of the box;

[0027] And check that the vacuum generating device, liquid level detecting device, graphite rotor, and lifting gate with encoder are operating normally;

[0028] Step 2: Preliminary aluminum water filling;

[0029] The No.1 gate is lowered and closed, and the No.2 gate is lifted to the maximum. The graphite rotor rotates at a low speed and is filled with argon. The molten aluminum enters the vacuum degassing device through the back flow slot;

[0030] When the liquid level detection device detects that the aluminum liquid is higher than the filling port, the graphite rotor rotates at a low speed and fills with argon gas, and the vacuum generating device starts to extract the air inside the box to form a vacuum and raise the aluminum liquid level inside the box;

[0031] When the height of the aluminum liquid in the box exceeds that of the graphite rotor, the graphite rotor increases to the maximum speed;

[0032] When the liquid level in the box exceeds the top surface of the baffle, the No. 2 gate is closed and the No. 1 gate opens a small gap. At this time, the aluminum liquid flows in from the filling port A, passes through the internal refractory material, and flows out from the filling port B, forming a siphon phenomenon;

[0033] The vacuum generating device continues to be enlarged to raise the height of the aluminum liquid in the box;

[0034] Then, entering steady state:

[0035] When the aluminum liquid height in the box reaches the set height, the pressure is kept stable;

[0036] Gate No. 1 is opened to the maximum.

[0037] As a further improvement of the above technical solution:

[0038] The aluminum liquid is made to flow through the vacuum generating device 8 to realize the degassing process of the aluminum liquid.

[0039] Gate No. 2 is opened to the maximum;

[0040] Cooperate with the liquid level detection device to automatically adjust the vacuum generating device to lower the aluminum liquid level in the box until it is emptied;

[0041] Stop the vacuum generator and graphite rotor;

[0042] Step 3: Clean the degassing box;

[0043] After draining the aluminum liquid from the launder, open the door cover;

[0044] Release the clamping device, and the lifting electric cylinder will lift the heating device as a whole;

[0045] Clean the residue inside the box;

[0046] Step 4: Finish and wait for the next work.

[0047] The beneficial effects of the present invention are as follows:

[0048] The present invention has a compact and reasonable structure and is easy to operate. By redesigning the degassing device, a lifting belt compression heating device is added, which effectively improves the heating effect and can also heat the aluminum liquid. It is also provided with a compression device to improve the sealing effect of the heating device.

[0049] The present invention forms a siphon effect through the linkage operation of a lifting gate with an encoder, a liquid level detection device and a vacuum generating device, so that the aluminum liquid flows through a vacuum degassing box.

[0050] The revolving door cover of the present invention is provided with three seals: a primary seal (hard seal of fire-resistant lining), a secondary seal (soft seal of sealing fiber sealing pad), and a tertiary seal (soft seal of high-temperature resistant sealing ring), which effectively improves the sealing performance of the door cover; the revolving door cover can be completely separated from the shell by the rocker arm revolving door cover, which is convenient for cleaning.

[0051] The present invention arranges the rotor at the bottom of the shell, which effectively increases the rotation speed of the rotor, thereby releasing more dense argon bubbles, which are fully in contact with the aluminum liquid, thereby achieving a better degassing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of the present invention.

[0053] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention.

[0054] Figure 3 It is the front view of the present invention.

[0055] Figure 4 It is a top view of the present invention.

[0056] Figure 5 It is a schematic structural diagram of the lifting and heating device of the present invention.

[0057] Figure 6 It is a front view of the lifting heating device of the present invention.

[0058] Figure 7 It is a schematic structural diagram of the door cover of the present invention.

[0059] Figure 8 It is the front view of the door cover of the present invention.

[0060] Among them: 1. Door cover; 2. Fiber sealing pad; 3. Rocker arm; 4. Support frame; 5. Negative pressure detection device; 6. Lifting and heating device; 7. Dust removal device; 8. Vacuum generating device; 9. Liquid level detection device; 10. Flow trough; 11. Box body; 12. Base; 13. No. 1 gate; 14. No. 2 gate; 15. Inner cavity; 16. Baffle; 17. Graphite rotor; 18. Rotor driving device;

[0061] 101. outer shell; 102. high temperature resistant sealing ring; 103. fire resistant lining;

[0062] 601, sliding frame; 602, vertical guide wheel; 603, lateral guide wheel; 604, slider; 605, connecting plate; 606, lifting plate; 607, locking plate; 608, pressing cylinder; 609, heating rod; 610, lifting electric cylinder;

[0063] 1001. Fill port A; 1002. Fill port B. DETAILED DESCRIPTION

[0064] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0065] like Figure 1-Figure 8 As shown, the vacuum degassing device of this embodiment includes two bases 12 distributed at intervals, a box 11 is installed on the upper part of the base 12, the top surface of the box 11 is provided with an opening, a lifting and heating device 6 is installed at the opening, a negative pressure detection device 5 is provided on the box 11 next to the lifting and heating device 6, a horizontal flow slot 10 is provided at the back of the box 11, a filling port A 1001 and a filling port B 1002 are provided on the flow slot 10, and a gate plate 13 and a gate plate 14 with intervals and encoders are installed on the flow slot 10; one side of the box 11 is provided with A dust removal device 7 and a vacuum generating device 8, a liquid level detecting device 9 is also installed on one side of the box body 11, and a rocker arm 3 is installed on the other side of the box body 11 through a supporting frame 4, and the end of the rocker arm 3 is fixed to the middle position of the top surface of the door cover 1, and the front end surface of the box body 11 is open, and the open opening and the door cover 1 are sealed by a sealing device; a baffle plate 16 is fixed to the middle position at the bottom of the box body 11, and a distance is left between the top surface of the baffle plate 16 and the inner top surface of the box body 11, and graphite rotors 17 are respectively installed on both sides of the baffle plate 16, and a rotor driving device 18 of the graphite rotor 17 is provided on the bottom surface of the box body 11.

[0066] The box body 11 adopts a space-type shell structure, and an inner cavity 15 is formed inside the box body 11 after the door cover 1 is covered.

[0067] The structure of the lifting and heating device 6 is as follows: it includes a sliding frame 601, a slider 604 is installed in the sliding frame 601, two vertical guide wheels 602 are respectively arranged on both sides of the slider 604, and a lateral guide wheel 603 is installed between the two vertical guide wheels 602 on one side; a lifting electric cylinder 610 is installed below the sliding frame 601, and the shaft head of the lifting electric cylinder 610 passes through the bottom of the sliding frame 601 and is fixed to the slider 604, and the back of the slider 604 is fixed to the lifting plate 606 through the connecting plate 605, and the four corners of the lifting plate 606 are respectively provided with mounting holes, and heating rods 609 are installed in the mounting holes, and the four heating rods 609 extend into the interior of the box body 11, and clamping devices are respectively arranged on both sides of the lifting plate 606.

[0068] The structure of a single clamping device is as follows: it includes a clamping cylinder 608 fixed on the top surface of the box body 11, and a locking plate 607 with a right-angle structure is fixed to the output end of the clamping cylinder 608. The locking plate 607 matches the end surface of the lifting plate 606 to press and seal.

[0069] The sliding frame 601 is locked on the back side of the box body 11 through a fixing plate.

[0070] A V-shaped sealing gasket is installed at the connection between the mounting hole and the heating rod 609 through a clamping ring, and a high-temperature sealing ring is installed under the lifting plate 606, and the high-temperature sealing ring is sealed with the opening of the box body 11.

[0071] The structure of the door cover 1 is as follows: it comprises an outer shell 101 , a fire-resistant lining 103 is installed on the inner side of the outer shell 101 , a fiber sealing pad 2 is installed on the outer side of the fire-resistant lining 103 , and a high-temperature resistant sealing ring 102 is installed on the outer side of the fiber sealing pad 2 .

[0072] The refractory lining 103 is a hard seal, and the high temperature resistant sealing ring 102 and the fiber sealing pad 2 are soft seals.

[0073] A liquid level meter is installed in the flow trough 10 .

[0074] The process flow of the vacuum degassing device according to claim 9 of this embodiment includes the following operation flow:

[0075] Step 1: Preparation;

[0076] Check door cover 1 and make sure the sealing device on door cover 1 is intact, then close door cover 1;

[0077] The lifting electric cylinder 610 is started to insert the heating rod 609 into the inner cavity 15 of the box body 11 to heat the internal refractory material; then the pressing cylinder 608 of the pressing device is actuated to make the locking plate 607 press down the lifting plate 606 to ensure the sealing of the box body 11;

[0078] And check that the vacuum generating device 8, the liquid level detecting device 9, the graphite rotor 17, and the lifting gate with encoder are operating normally;

[0079] Step 2: Preliminary aluminum water filling;

[0080] The No. 1 gate 13 is lowered and closed, the No. 2 gate 14 is lifted to the maximum, the graphite rotor 17 rotates at a low speed and is filled with argon gas, and the molten aluminum enters the vacuum degassing device through the back flow channel 10;

[0081] When the liquid level detection device 9 detects that the aluminum liquid is higher than the filling port, the graphite rotor 17 rotates at a low speed and fills with argon gas, and the vacuum generating device 8 is started to extract the air inside the box 11 to form a vacuum and increase the aluminum liquid level inside the box 11;

[0082] When the height of the aluminum liquid in the box 11 exceeds the graphite rotor 17, the graphite rotor 17 increases to the maximum speed;

[0083] When the liquid level in the box 11 exceeds the top surface of the baffle 16, the second gate 14 is closed, and the first gate 13 opens a small gap. At this time, the aluminum liquid flows in from the filling port A 1001, passes through the internal refractory material, and flows out from the filling port B 1002, forming a siphon phenomenon;

[0084] The vacuum generating device 8 continues to be enlarged to raise the height of the aluminum liquid in the box 11;

[0085] Then, entering steady state:

[0086] When the height of the aluminum liquid in the box 11 reaches the set height, the pressure is kept stable;

[0087] The first gate 13 is opened to the maximum.

[0088] The aluminum liquid is made to flow through the vacuum generating device 8 to realize the degassing process of the aluminum liquid.

[0089] The second gate 14 is opened to the maximum;

[0090] Cooperating with the liquid level detection device 9, the vacuum generating device 8 is automatically adjusted to lower the aluminum liquid level in the box 11 until it is emptied;

[0091] Stop the vacuum generating device 8 and the graphite rotor 17;

[0092] Step 3: Clean the degassing box;

[0093] After draining the aluminum liquid from the flow trough 10, open the door cover 1;

[0094] Release the clamping device, and the lifting electric cylinder 610 lifts the heating device as a whole;

[0095] Clean the residue in the box 11;

[0096] Step 4: Finish and wait for the next work.

[0097] The box body 11 and the door cover 1 described in the present invention are of split structure, can be completely separated, and can be opened and closed by using the rocker arm 3. The door cover 1 is far away from the box body 11, and it is very convenient to clean the residue.

[0098] The top surface of the baffle 16 of the present invention is a pointed structure, which makes drainage more convenient.

[0099] The specific structure and function of the vacuum degassing device described in the present invention are as follows:

[0100] It mainly includes a box body 11, which adopts a shell structure. The top of the box body 11 is provided with a liftable belt compression and heating device (i.e., a lift heating device 6) and a negative pressure detection device 5. The back of the box body 11 is provided with a flow channel 10, and the flow channel 10 is provided with a lift gate with an encoder and a liquid level detection device, etc. A rotatable door cover 1 is provided in front of the box body 11, which is opened and closed by a rocker arm 3; a baffle 16 and a graphite rotor 17 are provided in the box body 11, and a rotor driving device 18 is provided at the lower part; a dust removal device 7 and a vacuum generating device 8 are provided on the right side of the box body 11.

[0101] The specific structure of the lifting and heating device 6 is as follows: it includes a sliding frame 601, a slider 604 is installed in the sliding frame 601, four vertical guide wheels 602 and two lateral guide wheels 603 are installed on the slider 604, a lifting electric cylinder 610 is installed below the sliding frame 601, the shaft head of the lifting electric cylinder 610 is connected to the slider 604, a connecting plate 605 perpendicular to the slider 604 is fixed to the back of the slider 604, a lifting plate 606 is fixed to the bottom of the connecting plate 605, mounting holes are respectively opened at the four corners of the lifting plate 606, a heating rod 609 is installed in the mounting hole, a V-shaped sealing gasket is installed at the connection between the mounting hole and the heating rod 609 through a clamping ring, a high-temperature sealing ring is installed below the lifting plate 606, and clamping devices are respectively arranged on both sides of the lifting plate 606.

[0102] The structure of the clamping device is as follows: it includes a clamping cylinder 608 fixed on the top surface of the box body 11, and a locking plate 607 with a right-angle structure is fixed to the output end of the clamping cylinder 608. The locking plate 607 matches the end surface of the lifting plate 606 to press and seal.

[0103] The flow trough 10 is provided with a lifting gate plate with an encoder and a liquid level gauge, and the lifting gate plate is divided into a gate plate No. 13 and a gate plate No. 2 14 which are separated from each other.

[0104] The door cover 1 comprises an outer shell 101 , a fire-resistant lining 103 is installed on the inner side of the door cover 1 , a fiber sealing pad 2 is installed on the outer side of the fire-resistant lining 103 , and a high-temperature resistant sealing ring 102 is installed on the outer side of the fiber sealing pad 2 .

[0105] The specific operation steps of the process flow of a vacuum degassing device of this embodiment are as follows:

[0106] First, the preparations before activation:

[0107] Check the door cover 1 and make sure its three-layer seal is intact. Close the door cover 1.

[0108] Start the lifting electric cylinder 610 to insert the heating rod 609 into the inner cavity 15 of the box body 11 to heat the internal refractory material;

[0109] The pressing device is actuated to make the sealing ring of the heating device reach the pressing amount;

[0110] Check that the vacuum generating device 8, the liquid level detecting device 9, the rotor, and the lifting gate with encoder are operating normally.

[0111] Secondly, initial aluminum water filling:

[0112] The No. 1 gate 13 is lowered and closed, the No. 2 gate 14 is lifted to the maximum, the graphite rotor 17 rotates at a low speed and is filled with argon gas, and the molten aluminum enters the vacuum degassing device through the back flow channel 10.

[0113] When the liquid level detection device 9 detects that the aluminum liquid is higher than the filling port, the vacuum generating device 8 is activated to extract the air inside the box body 11 to form a vacuum and increase the height of the aluminum liquid inside the box body 11 .

[0114] When the height of the aluminum liquid in the box 11 exceeds the graphite rotor 17, the graphite rotor 17 increases to the maximum speed.

[0115] When the liquid level in the box 11 reaches a certain height, the second gate 14 is closed and the first gate 13 opens a small gap. At this time, the aluminum liquid flows in from the filling port A 1001, passes through the internal refractory material, and flows out from the filling port B 1002, forming a siphon phenomenon.

[0116] The vacuum generating device 8 continues to be enlarged, raising the height of the aluminum liquid in the box body 11.

[0117] Then, entering steady state:

[0118] When the height of the aluminum liquid in the box body 11 reaches a set height, the vacuum generating device 8 maintains the pressure to stabilize the height of the aluminum liquid in the box body 11 .

[0119] The first gate 13 is opened to the maximum.

[0120] Through the siphon phenomenon, the aluminum liquid flows through the vacuum generating device 8 to achieve the aluminum liquid degassing process.

[0121] Entering a stable degassing state;

[0122] Empty the degassing box when casting is terminated:

[0123] The second gate 14 is opened to the maximum;

[0124] Cooperating with the liquid level detection device 9, the vacuum generating device 8 is automatically adjusted to lower the aluminum liquid level in the box body 11 until it is emptied.

[0125] The vacuum generating device 8 and the graphite rotor 17 are stopped.

[0126] Finally, clean the degassing box:

[0127] After draining the aluminum liquid from the flow trough 10, open the door cover 1;

[0128] Release the clamping device, and the lifting electric cylinder 610 lifts the heating device;

[0129] Clean the residue in the box 11;

[0130] Finish.

[0131] The invention is easy to operate as a whole and has good working reliability.

[0132] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A vacuum degassing device, characterized in that: The invention comprises two bases (12) arranged at intervals, a box (11) is installed on the upper part of the base (12), an opening is arranged on the top surface of the box (11), a lifting and heating device (6) is installed at the opening, a negative pressure detection device (5) is arranged on the box (11) beside the lifting and heating device (6), a horizontal flow slot (10) is arranged at the back of the box (11), a filling port A (1001) and a filling port B (1002) are arranged on the flow slot (10), and a No. 1 gate plate (13) and a No. 2 gate plate (14) with an encoder are installed on the flow slot (10); a dust removal device (7) and a vacuum pump are installed on one side of the box (11). A vacuum generating device (8) is provided, a liquid level detecting device (9) is also installed on one side of the box body (11), a rocker arm (3) is installed on the other side of the box body (11) through a support frame (4), the end of the rocker arm (3) is fixed to the middle position of the top surface of the door cover (1), the front end surface of the box body (11) is open, and the open opening and the door cover (1) are sealed by a sealing device; a baffle (16) is fixed at the middle position at the bottom of the box body (11), a distance is left between the top surface of the baffle (16) and the inner top surface of the box body (11), graphite rotors (17) are installed on both sides of the baffle (16), and a rotor driving device (18) of the graphite rotor (17) is provided on the bottom surface of the box body (11).

2. The vacuum degassing device according to claim 1, characterized in that: The box body (11) adopts a space-type shell structure, and an inner cavity (15) is formed inside the box body (11) after the door cover (1) is covered.

3. The vacuum degassing device according to claim 2, characterized in that: The structure of the lifting and heating device (6) is as follows: it comprises a sliding frame (601), a sliding block (604) is installed in the sliding frame (601), two vertical guide wheels (602) are respectively arranged on both sides of the sliding block (604), and a lateral guide wheel (603) is installed between the two vertical guide wheels (602) on one side; a lifting electric cylinder (610) is installed below the sliding frame (601), the shaft head of the lifting electric cylinder (610) passes through the bottom of the sliding frame (601) and is fixed to the sliding block (604), the back of the sliding block (604) is fixed to the lifting plate (606) through a connecting plate (605), and mounting holes are respectively opened at the four corners of the lifting plate (606), heating rods (609) are installed in the mounting holes, and the four heating rods (609) extend into the interior of the box body (11), and clamping devices are respectively arranged on both sides of the lifting plate (606).

4. The vacuum degassing device according to claim 3, characterized in that: The structure of a single pressing device is as follows: it includes a pressing cylinder (608) fixed on the top surface of the box body (11), a locking plate (607) with a right-angle structure is fixed to the output end of the pressing cylinder (608), and the locking plate (607) matches the end surface of the lifting plate (606) to press and seal.

5. The vacuum degassing device according to claim 4, characterized in that: The sliding frame (601) is locked on the back side of the box body (11) via a fixing plate.

6. The vacuum degassing device according to claim 5, characterized in that: A V-shaped sealing gasket is installed at the connection between the mounting hole and the heating rod (609) through a clamping ring, and a high-temperature sealing ring is installed below the lifting plate (606), and the high-temperature sealing ring is sealed with the opening of the box body (11).

7. The vacuum degassing device according to claim 6, characterized in that: The door cover (1) has a structure comprising an outer shell (101), a fire-resistant lining (103) is installed on the inner side of the outer shell (101), a fiber sealing pad (2) is installed on the outer side of the fire-resistant lining (103), and a high-temperature resistant sealing ring (102) is installed on the outer side of the fiber sealing pad (2).

8. The vacuum degassing device according to claim 7, characterized in that: The refractory lining (103) is a hard seal, and the high temperature resistant sealing ring (102) and the fiber sealing pad (2) are soft seals.

9. The vacuum degassing device according to claim 8, characterized in that: A liquid level meter is installed in the flow trough (10).

10. A process flow of the vacuum degassing device according to claim 9, characterized in that: The following operation procedures are included: Step 1: Preparation; Check the door cover (1) to make sure that the sealing device on the door cover (1) is intact, and then close the door cover (1); The lifting electric cylinder (610) is started to insert the heating rod (609) into the inner cavity (15) of the box body (11) to heat the internal refractory material; then the pressing cylinder (608) of the pressing device is activated to make the locking plate (607) press down the lifting plate (606) to ensure the sealing of the box body (11); Check that the vacuum generating device (8), the liquid level detecting device (9), the graphite rotor (17), and the lifting gate with encoder are operating normally; Step 2: Preliminary aluminum water filling; The No. 1 gate (13) is lowered and closed, the No. 2 gate (14) is lifted to the maximum, the graphite rotor (17) rotates at a low speed and is filled with argon gas, and the molten aluminum passes through the back flow channel (10) and enters the vacuum degassing device; When the liquid level detection device (9) detects that the aluminum liquid is higher than the filling port, the graphite rotor (17) rotates at a low speed and is filled with argon gas, and the vacuum generating device (8) is started to extract the air inside the box (11) to form a vacuum, thereby raising the aluminum liquid level inside the box (11); When the height of the aluminum liquid in the box (11) exceeds the graphite rotor (17), the graphite rotor (17) is increased to a maximum speed; When the liquid level in the box (11) exceeds the top surface of the baffle (16), the second gate (14) is closed and the first gate (13) opens a small gap. At this time, the aluminum liquid flows in from the filling port A (1001), passes through the internal refractory material, and flows out from the filling port B (1002), forming a siphon phenomenon. The vacuum generating device (8) continues to be enlarged to raise the height of the aluminum liquid in the box (11); Then, entering steady state: When the height of the aluminum liquid in the box (11) reaches a set height, the pressure is kept stable; The first gate (13) is opened to the maximum. Through the siphon phenomenon, the aluminum liquid flows through the vacuum generating device 8 to achieve the aluminum liquid degassing process. Entering a stable degassing state; When casting is terminated, empty the degassing box. The second gate (14) is opened to the maximum; Cooperating with the liquid level detection device (9), the vacuum generating device (8) is automatically adjusted to lower the aluminum liquid level in the box (11) until it is emptied; Stopping the vacuum generating device (8) and the graphite rotor (17); Step 3: Clean the degassing box; After draining the aluminum liquid from the launder (10), open the door cover (1); The clamping device is released, and the lifting electric cylinder (610) lifts the heating device as a whole; Cleaning the residue in the box (11); Step 4: Finish and wait for the next work.

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