Method and device for bipolar filtration and impurity removal of positive and negative pressure double-acting liquid-phase metal melt

Abstract

The invention discloses a positive and negative pressure double-acting liquid-phase metal melt bipolar filtering and impurity removing method and a positive and negative pressure double-acting liquid-phase metal melt bipolar filtering and impurity removing device. The wall plate is used for dividing the filtering box body into a first filtering box and a second filtering box; the metal melt inlet is formed in the bottom of the wall plate and is communicated with the first filtering box and the second filtering box; the inlet launder and the outlet launder are respectively and independently communicated with the first filtering box and the second filtering box; two ends of the wall plate are respectively positioned at the bottommost part and the topmost part of the inner cavity of the first filter box; a vacuumizing device for forming negative pressure on the second filter box and the first filter box is also mounted on the second filter box; a coarse filtering device for filtering metal melt is installed in the first filtering box, and a fine filtering device is installed in the second filtering box. The inlet launder and the outlet launder are independently arranged on the first filter box and the second filter box, so that metallurgical defects caused by untight sealing between the flashboard and the launder when an integrated launder is used are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of metal melt impurity removal, in particular to a method and device for removing impurities by bipolar filtering of liquid-phase metal melt using a positive and negative pressure dual-action method. Background Art

[0002] As authorized on May 15, 2020, the invention patent with authorization publication number CN107208179B discloses an apparatus and method for removing unwanted inclusions from a metal melt, the apparatus comprising: a container having a metal shell and an internal structure made of a heat-resistant, insulating and refractory material; a cover removably arranged on the top of the container to keep the container sealed, the container being provided with: an inlet chamber whose inlet opening receives metal from a metal supply trough; and an outlet chamber having an outlet opening, an air evacuation device and a refractory filter being provided in the inlet chamber and / or the outlet chamber, the apparatus comprising a device for triggering the refractory filter by molten metal flowing in the opposite direction to the flow of the molten metal during filtration, the inlet chamber and the outlet chamber being arranged side by side and separated by a partition wall, the partition wall extending upward from the bottom of the container to a predetermined height, the container being connected in parallel to the metal supply trough via a transverse metal trough stub, the trough stub being arranged between the inlet opening and the outlet opening and the supply trough, respectively, the supply trough being provided with a valve device near the outlet of the container and another valve device between the two trough stubs; The above-mentioned technical solution only adopts a single negative pressure. The launder adopts an integrated launder and is equipped with multiple gate devices. Because the gate works inside the melt, it is inevitable that a gap is formed between the gate and the launder due to poor sealing. Such a gap cannot be found in the actual metal melt production process. Therefore, the imported metal melt will flow directly to the outlet without passing through the filtering device, causing metallurgical defects in the casting product, which is fatal to high-precision and cutting-edge casting products. At the same time, a large amount of air will be inhaled during the casting process due to poor sealing, which will greatly weaken the vacuum suction function and affect the vacuum degree, thereby seriously interfering with the formation of vacuum negative pressure. Moreover, the heating device is installed on the top of the filter box on the box cover. When the heating device heats the inside of the box, it is easy to cause uneven heating of the molten metal, and then the inside of the filter box is easy to be blocked due to the solidification of the molten metal and reduce the casting effect; At the same time, the filter box design in the above scheme only has a single-stage filtration, so the quality of the metal melt in the previous process is very high. Once the quality of the metal melt in the previous process is poor, it is very easy to cause the filter device to clog. Therefore, a method and device for removing impurities by bipolar filtration of liquid metal melt using positive and negative pressure dual-action is proposed. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and to propose a method and device for bipolar filtration and impurity removal of liquid metal melt by positive and negative pressure dual action.

[0004] In order to achieve the above object, the present invention provides the following technical solution: a method for removing impurities from a liquid metal melt by bipolar filtration using a positive and negative pressure dual-action method, characterized in that: After the empty box is preheated to the set temperature, the box cover is closed, the blocking device at the inlet chute independently connected to the first filter box is opened, and the blocking device at the outlet chute independently connected to the second filter box is blocked, and the molten metal enters the interior of the first filter box through the liquid inlet of the inlet chute. When the metal liquid level range finder on the upper part of the inlet chute detects that the liquid level of the molten metal flowing naturally in the inlet chute reaches the set height value, the vacuum suction device is opened to vacuum suction the first filter box, and the molten metal inside the box is drained under negative pressure by vacuum suction; The metal melt drawn by negative pressure passes through the coarse filter device in the first filter box to filter out coarse impurities. The coarsely filtered metal melt then passes through the melt channel at the bottom of the wall panel between the first and second filter boxes and enters the second filter box, where it is filtered out by the fine filter device to remove finer impurities. When the metal level range finder in the second filter box detects that the liquid level of the molten metal reaches the set height, the vacuum suction device performs vacuum suction on the second filter box, the blocking device at the outlet chute opens, and the molten metal after coarse and fine filtration passes through the outlet chute into the casting stage; When the metal level rangefinder on the upper part of the outlet chute detects that the liquid level of the metal melt in the outlet chute is lower than the set height; the vacuum suction device stops working, and the positive pressure device is started to fill the first filter box and / or the second filter box with inert gas to lower the liquid level of the metal melt in the box, and then the positive pressure device stops working, and starts the vacuum suction device to increase the liquid level of the metal melt in the box. By repeatedly opening and closing the vacuum suction device and the positive pressure device, the flow rate of the metal melt through the filter device is accelerated, the flow rate of the metal melt is increased, so that the metal melt passing through the filter device can meet the flow rate required for casting.

[0005] A filtering device for a positive and negative pressure dual-action bipolar filtration and impurity removal method for liquid metal melt is characterized in that it includes a filter box, a wall panel that divides the filter box into a first filter box and a second filter box, a metal melt channel arranged at the bottom of the wall panel and connecting the first filter box and the second filter box, an inlet flow trough independently connected to the first filter box and an outlet flow trough independently connected to the second filter box; the first filter box and the second filter box are connected to a vacuum suction device that forms a negative pressure on the first filter box and the second filter box through a pipeline; a coarse filtration device for filtering the metal melt is installed in the first filter box, and a fine filtration device for filtering the metal melt is installed in the second filter box.

[0006] Preferably, the first filter box is provided with a liquid inlet communicating with the inlet flow channel, and the second filter box is provided with a liquid outlet communicating with the outlet flow channel; the inlet flow channel is also provided with a flow channel inlet corresponding to the liquid inlet, and the outlet flow channel is provided with a flow channel outlet corresponding to the liquid outlet.

[0007] Preferably, it also includes a positive pressure device capable of flushing inert gas into the first filter box and / or the second filter box; the positive pressure device includes a positive pressure charging pipe connected to the first filter box and the second filter box respectively and charging the first filter box and the second filter box with inert gas, a control valve connected to the charging pipe and an air source pipeline connected to the control valve.

[0008] Preferably, the inlet chute and the outlet chute are both provided with a blocking device and a metal level range finder for real-time monitoring of the metal melt level, and the first filter box and / or the second filter box are also provided with a metal level range finder.

[0009] Preferably, the blocking device includes a connecting rod installed on the first filter box and the second filter box, a blocking block installed at one end of the connecting rod, a driving source connected to the other end of the connecting rod to drive the connecting rod to move, and a support rod to support the connecting rod.

[0010] Preferably, a guide groove is provided at the bottom of the second filter box, which allows the molten metal flowing from the molten metal channel to flow vertically upward, horizontally to the side, vertically downward, and horizontally to the side before flowing to the liquid outlet.

[0011] Preferably, the first filter box and the second filter box are respectively provided with a flip-up box cover; the box cover is provided with a high-temperature resistant sealing ring and a high-temperature fireproof groove; the high-temperature fireproof groove is filled with a rope-shaped high-temperature material.

[0012] Preferably, the first filter box and the second filter box are both equipped with a turning guide seat for facilitating the turning of the box cover and a second driving source for driving the box cover to turn over.

[0013] Preferably, the method further comprises a movable preheating device arranged at the flow channel inlet and / or the flow channel outlet for preheating the first filter box and / or the second filter box.

[0014] The beneficial effects of the present invention are as follows: by utilizing a vacuum suction device to evacuate the first filter box and the second filter box to form a negative pressure to drain the metal melt under negative pressure, the metal melt sequentially passes through the coarse filter device and the fine filter device in the first filter box and the second filter box by utilizing the negative pressure drainage, and the metal melt is subjected to coarse filtration and fine filtration, thereby improving the quality and purification effect of the metal melt; By repeatedly opening and closing the vacuum suction device and the positive pressure device, the flow rate of the molten metal through the filter device is accelerated, the flow rate of the molten metal is increased, so that the molten metal passing through the filter device can meet the flow rate required for casting, and the service life of the coarse filter and the fine filter is extended; The inlet chute and the outlet chute are independently arranged on the first filter box and the second filter box respectively, so as to avoid the metal melt without being filtered flowing directly to the outlet due to the loose seal between the gate plate and the chute when using an integrated chute, causing metallurgical defects in the casting product and posing fatal damage to high-precision and cutting-edge casting products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention.

[0016] Figure 2 It is a cross-sectional view of the filter box of the present invention.

[0017] Figure 3 It is a cross-sectional view of the first filter box of the present invention.

[0018] Figure 4 It is a cross-sectional view of the second filter box of the present invention.

[0019] Figure 5 It is a structural schematic diagram of the box cover of the present invention.

[0020] Figure 6 It is a partial structural schematic diagram of the present invention.

[0021] Legend: 0. Filter box; 1. First filter box; 101. Inlet flow channel; 102. Coarse filtration device; 103. Wall panel; 104. Liquid inlet; 105. Flow channel inlet; 2. Second filter box; 201. Outlet flow channel; 202. Fine filtration device; 203. Guide channel; 204. Liquid outlet; 205. Flow channel outlet; 3. Box cover; 301. High-temperature resistant sealing ring; 302. High-temperature fireproof groove; 303. Flip guide seat; 304. Driving source 2; 4. Metal melt channel; 5. Vacuum suction device; 6. Positive pressure device; 601. Positive pressure charging pipe; 602. Control valve; 7. Blocking device; 701. Connecting rod; 702. Blocking block; 703. Driving source; 704. Support rod; 8. Metal liquid level rangefinder. DETAILED DESCRIPTION

[0022] The following further describes the method and device for bipolar filtration and impurity removal of liquid metal melt using positive and negative pressure dual-action according to the present invention with reference to the accompanying drawings.

[0023] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0024] See attached Figure 1-6 As shown, the filtering device for bipolar filtration and impurity removal of liquid metal melt with positive and negative pressure dual action in this embodiment is characterized by: comprising a filter box body 0, a wall panel 103 for dividing the filter box body 0 into a first filter box 1 and a second filter box 2, a metal melt channel 4 arranged at the bottom of the wall panel 103 and connected to the first filter box 1 and the second filter box 2, an inlet flow trough 101 independently connected to the first filter box 1 and an outlet flow trough 201 independently connected to the second filter box 2; the first filter box 1 and the second filter box 2 are connected to a vacuum suction device 5 for forming a negative pressure on the first filter box 2 and the second filter box 1 through a pipeline; a coarse filter device 102 for filtering the metal melt is installed in the first filter box 1, and a fine filter device 202 for filtering the metal melt is installed in the second filter box 2; the filter box body 0 is a box body with a heat-insulating structure; the fine filter device 202 and the coarse filter device 102 can be selected from ceramic filter devices or other filter devices with filtering effects; By using the vacuum suction device 5 to evacuate the first filter box 1 and the second filter box 2 to form a negative pressure to drain the metal melt under negative pressure, the metal melt passes through the coarse filter device 102 and the fine filter device 202 in the first filter box 1 and the second filter box 2 in sequence by the negative pressure drainage, and the metal melt is coarsely filtered and finely filtered, thereby improving the quality of the metal melt and the purification effect; By independently arranging the inlet flow channel 101 and the outlet flow channel 201 on the first filter box 1 and the second filter box 2 respectively, it is avoided that when using an integrated flow channel, the unfiltered metal melt flows directly to the outlet due to the loose seal between the gate plate and the flow channel, causing metallurgical defects in the casting product and posing fatal damage to high-precision and cutting-edge casting products.

[0025] See attached Figure 3-4 As shown, the first filter box 1 is provided with a liquid inlet 104 communicating with the inlet chute 101, and the second filter box 2 is provided with a liquid outlet 204 communicating with the outlet chute 201; the inlet chute 101 is further provided with a chute inlet 105 corresponding to the liquid inlet 104, and the outlet chute 201 is provided with a chute outlet 205 corresponding to the liquid outlet 204; See attached Figure 1As shown, it also includes a positive pressure device 6 capable of flushing inert gas into the first filter box 1 and / or the second filter box 2; the positive pressure device 6 includes a positive pressure charging pipe 601 connected to the first filter box 1 and the second filter box 2 respectively and charging the first filter box 1 and the second filter box 2 with inert gas, a control valve 602 connected to the positive pressure charging pipe 601 and an air source pipeline connected to the control valve 602; the air source pipeline is connected to the air source by switching the control valve 602, and the inert compressed gas in the air source is delivered to the first filter box 1 and / or the second filter box 2 through the positive pressure charging pipe 601, and the first filter box 1 and / or the second filter box 2 are flushed with inert gas. Positive pressure is filled in the filter box 1 and / or the second filter box 2 to lower the height of the metal melt liquid level in the box, and then the positive pressure device 6 stops working, and the vacuum suction device 5 is started to increase the height of the metal melt liquid level in the box. By repeatedly opening and closing the vacuum suction device 5 and the positive pressure device 6, repeated switching of positive pressure and negative pressure is formed, thereby ensuring the patency of the filtration channels of the coarse filtration device 102 and the fine filtration device 101, accelerating the flow rate of the metal melt through the filtration device, and increasing the flow rate of the metal melt, while extending the service life of the coarse filtration device 102 and the fine filtration device 101.

[0026] See attached Figure 3-4 As shown, the inlet launder 101 and the outlet launder 201 are both provided with a blocking device 7 and a metal level ranger 8 for real-time monitoring of the metal melt liquid level, and the first filter box 1 and / or the second filter box 2 are also provided with a metal level ranger 8; the metal level ranger 8 is used to monitor the metal melt liquid level in the inlet launder 101 and the outlet launder 201 in real time, thereby facilitating real-time monitoring of the metal melt liquid level in the inlet launder 101 and the outlet launder 201.

[0027] See attached Figure 3-4 As shown, the blocking device 7 includes a connecting rod 701 installed on the first filter box 1 and the second filter box 2, a blocking block 702 installed at one end of the connecting rod 701, a driving source 703 connected to the other end of the connecting rod 701 to drive the connecting rod 701 to move, and a support rod 704 to support the connecting rod 701. When the driving source 703 drives one end of the connecting rod 701 to move, the connecting rod 701 drives the blocking block 702 to open or block the inlet flow channel 101 and the outlet flow channel 201, thereby facilitating the opening or blocking of the inlet flow channel 101 and the outlet flow channel 201.

[0028] See attached Figure 4As shown, a guide groove 203 is provided at the bottom of the second filter box 2. The guide groove 203 causes the molten metal flowing in from the molten metal channel 4 to flow vertically upward, horizontally to the side, vertically downward, and horizontally to the side in sequence before flowing to the liquid outlet 204; the guide groove 203 is used to guide the molten metal entering the second filter box 2, so that the molten metal is filtered by the fine filtering device 202 and then flows to the outlet flow groove 201.

[0029] See attached Figure 5 As shown, the first filter box 1 and the second filter box 2 are respectively provided with a box cover 3 which can be flipped installed; a high-temperature resistant sealing ring 301 and a high-temperature fireproof groove 302 are installed on the box cover 3; the high-temperature fireproof groove 302 is filled with a rope-shaped high-temperature material; by utilizing the high-temperature resistant sealing ring 301 and the rope-shaped high-temperature material in the high-temperature fireproof groove 302, a double seal is performed between the box cover 3 and the first filter box 1 and the second filter box 2, thereby improving the sealing strength between the first filter box 1 and the second filter box 2 and the box cover 3.

[0030] See attached Figure 6 As shown, the first filter box 1 and the second filter box 2 are both equipped with a flip guide seat 303 for facilitating the flipping of the box cover 3 and a second driving source 304 for driving the box cover 3 to flip; a rotating pin is installed between the flip guide seat 303 and the box cover 3; the box cover 3 is driven to flip along the flip guide seat 303 by the second driving source 304, thereby facilitating the opening or closing of the box cover 3.

[0031] See attached Figure 1 As shown, it also includes a movable preheating device arranged at the flow channel inlet 105 and / or the flow channel outlet 205 for preheating the first filter box 1 and / or the second filter box 2; the heating device can be selected from one of an electric heating rod device and a natural gas nozzle heating device; by utilizing the heating device to heat the first filter box 1 and the second filter box 2 at the liquid inlet 104 of the inlet flow channel 101 and the liquid outlet 204 of the outlet flow channel 201, the metal melt inside the first filter box 1 and the second filter box is better insulated, thereby improving the process conditions for multiple castings.

[0032] The working process of the present invention is as follows: first, the heating device heats the first filter box 1 and the second filter box 2 at the liquid inlet 104 of the inlet flow channel 101 and the liquid outlet 204 of the outlet flow channel 201 respectively. After the heating is completed, the driving source 2 304 drives the box cover 3 to flip along the flip guide seat 303 to close the box cover 3. Then, the driving source 703 in the blocking device 7 at the inlet flow channel 101 connected separately on the first filter box 1 drives one end of the connecting rod 701 to move, and the connecting rod 701 drives the blocking block 702 to close the inlet flow channel 101. The outlet chute 202 of the second filter box 2 is kept blocked, and the molten metal flows from the inlet chute 101 through the chute inlet 105 and the liquid inlet 104 into the first filter box 1. When the metal level range finder 8 on the upper part of the inlet chute 101 detects that the liquid level of the naturally flowing molten metal in the inlet chute 101 reaches the set height value, the vacuum suction device 5 is turned on to vacuum the first filter box 1, and the molten metal inside the first filter box 1 is drained under negative pressure by vacuum suction; The molten metal drained by negative pressure passes through the coarse filtering device 102 in the first filter box 1, and the coarse filtering device 102 performs coarse filtering on the impurities in the molten metal, and intercepts and filters the impurities larger than 20 microns in the molten metal. The filtered molten metal flows through the molten metal channel 4 to the guide groove 203 in the second filter box 2. The liquid level of the molten metal in the guide groove 203 rises and passes through the fine filtering device 202 for secondary filtration, and intercepts and filters the impurities smaller than 20 microns in the molten metal. When the metal liquid level range finder 8 in the second filter box 2 detects that the molten metal has reached the upper limit, the molten metal is filtered. When the liquid level of the body reaches the set height, the vacuum suction device 5 performs vacuum suction on the second filter box 2, the blocking device 7 at the outlet chute 201 works, the driving source 703 drives one end of the connecting rod 701 to move, and the connecting rod 701 drives the blocking block 702 to open the outlet chute 201. The molten metal after coarse and fine filtration flows through the liquid outlet 204 and the chute outlet 205 into the outlet chute 201 and then enters the casting stage. At this time, the liquid level of the molten metal at the inlet chute 101 is the same as the liquid level of the molten metal at the outlet chute 201; When the level of the molten metal at the outlet chute 201 is lower than that at the inlet chute 101, the blocking device 7 of the inlet chute 101 is controlled to control the flow of the molten metal; Then the vacuum suction device 5 stops working and starts the positive pressure device 6. By opening the control valve 602, the inert gas enters the positive pressure charging pipe 601, and the inert gas is charged into the first filter box 1 and / or the second filter box 2, so that the pressure in the first filter box 1 and the second filter box 2 is increased, and the metal melt is squeezed downward. The metal melt in the second filter box 2 flows into the first filter box 1, and the metal melt in the first filter box 1 flows to the inlet flow groove 101, reducing the height of the metal melt in the box. The metal melt is squeezed by the pressure and then passes through the coarse filter device 102 and the fine filter device 101 and is increased. The patency of the filtration channel, then the positive pressure device 6 stops working, and starts the vacuum suction device 5 to increase the height of the metal melt liquid level in the box, through the repeated opening and closing switching of the vacuum suction device 5 and the positive pressure device 6, repeated switching of positive pressure and negative pressure is formed, thereby ensuring the patency of the filtration channels of the coarse filtration device 102 and the fine filtration device 101, accelerating the flow rate of the metal melt through the filtration device, and increasing the flow rate of the metal melt, so that the metal melt passing through the filtration device can meet the required flow rate to the casting stage; at the same time, it plays a role in extending the service life of the coarse filtration device 102 and the fine filtration device 101.

[0033] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A method for removing impurities from a liquid metal melt by bipolar filtration using a positive and negative pressure dual action method, characterized in that: After the empty box is preheated to the set temperature, the box cover is closed, the blocking device at the inlet chute independently connected to the first filter box is opened, and the blocking device at the outlet chute independently connected to the second filter box is blocked, and the molten metal enters the interior of the first filter box through the liquid inlet of the inlet chute. When the metal liquid level range finder on the upper part of the inlet chute detects that the liquid level of the molten metal flowing naturally in the inlet chute reaches the set height value, the vacuum suction device is opened to vacuum suction the first filter box, and the molten metal inside the box is drained under negative pressure by vacuum suction; The metal melt drawn by negative pressure passes through the coarse filter device in the first filter box to filter out coarse impurities. The coarsely filtered metal melt then passes through the melt channel at the bottom of the wall panel between the first and second filter boxes and enters the second filter box, where it is filtered out by the fine filter device to remove finer impurities. When the metal level range finder in the second filter box detects that the liquid level of the molten metal reaches the set height, the vacuum suction device performs vacuum suction on the second filter box, the blocking device at the outlet chute opens, and the molten metal after coarse and fine filtration passes through the outlet chute into the casting stage; When the metal level rangefinder on the upper part of the outlet chute detects that the liquid level of the metal melt in the outlet chute is lower than the set height, the vacuum suction device stops working, and the positive pressure device is started to fill the first filter box and / or the second filter box with inert gas to lower the liquid level of the metal melt in the box. Then the positive pressure device stops working, and starts the vacuum suction device to increase the liquid level of the metal melt in the box. By repeatedly opening and closing the vacuum suction device and the positive pressure device, the flow rate of the metal melt through the filter device is accelerated, the flow rate of the metal melt is increased, and the metal melt passing through the filter device can meet the flow rate required for casting.

2. The filtering device of the positive and negative pressure dual-action bipolar filtration impurity removal method for liquid metal melt according to claim 1 is characterized in that: The invention comprises a filter box (0), a wall panel (103) for dividing the filter box (0) into a first filter box (1) and a second filter box (2), a metal melt channel (4) arranged at the bottom of the wall panel (103) and connected to the first filter box (1) and the second filter box (2), an inlet flow channel (101) independently connected to the first filter box (1), and an outlet flow channel (201) independently connected to the second filter box (2); the first filter box (1) and the second filter box (2) are connected to a vacuum suction device (5) for generating negative pressure on the first filter box (2) and the second filter box (1) through a pipeline; a coarse filtering device (102) for filtering the metal melt is installed in the first filter box (1), and a fine filtering device (202) for filtering the metal melt is installed in the second filter box (2).

3. The filtering device of the positive and negative pressure dual-action bipolar filtration and impurity removal method for liquid metal melt according to claim 2 is characterized in that: The first filter box (1) is provided with a liquid inlet (104) communicating with the inlet flow trough (101), and the second filter box (2) is provided with a liquid outlet (204) communicating with the outlet flow trough (201); the inlet flow trough (101) is also provided with a flow trough inlet (105) corresponding to the liquid inlet (104), and the outlet flow trough (201) is provided with a flow trough outlet (205) corresponding to the liquid outlet (204).

4. The filtering device of the positive and negative pressure dual-action bipolar filtration impurity removal method for liquid metal melt according to claim 2, characterized in that: The apparatus further comprises a positive pressure device (6) capable of injecting inert gas into the first filter box (1) and / or the second filter box (2); the positive pressure device (6) comprises a positive pressure injection pipe (601) connected to the first filter box (1) and the second filter box (2) respectively and injecting inert gas into the first filter box (1) and the second filter box (2), a control valve (602) connected to the positive pressure injection pipe (601), and a gas source pipeline connected to the control valve (602).

5. The filtering device of the positive and negative pressure dual-action bipolar filtration impurity removal method for liquid metal melt according to claim 2, characterized in that: The inlet chute (101) and the outlet chute (201) are both provided with a blocking device (7) and a metal level distance meter (8) for real-time monitoring of the metal melt level. The first filter box (1) and / or the second filter box (2) are also provided with a metal level distance meter (8).

6. The filtering device of the positive and negative pressure dual-action bipolar filtering and impurity removal method for liquid metal melt according to claim 4, characterized in that: The blocking device (7) comprises a connecting rod (701) mounted on the first filter box (1) and the second filter box (2), a blocking block (702) mounted on one end of the connecting rod (701), a driving source (703) connected to the other end of the connecting rod (701) for driving the connecting rod (701) to move, and a support rod (704) for supporting the connecting rod (701).

7. The filtering device of the positive and negative pressure dual-action bipolar filtration impurity removal method for liquid metal melt according to claim 3, characterized in that: A guide groove (203) is provided at the bottom of the second filter box (2), and the guide groove (203) allows the metal melt flowing from the metal melt inlet (4) to flow vertically upward, horizontally to the side, vertically downward, and horizontally to the side in sequence before flowing to the liquid outlet (204).

8. The filtering device of the positive and negative pressure dual-action bipolar filtering and impurity removal method for liquid metal melt according to claim 2, characterized in that: The first filter box (1) and the second filter box (2) are each provided with a box cover (3) which can be flipped and mounted thereon; a high-temperature resistant sealing ring (301) and a high-temperature fireproof groove (302) are mounted on the box cover (3); and the high-temperature fireproof groove (302) is filled with a rope-shaped high-temperature material.

9. The filtering device of the positive and negative pressure dual-action bipolar filtering and impurity removal method for liquid metal melt according to claim 8, characterized in that: The first filter box (1) and the second filter box (2) are both equipped with a turning guide seat (303) for facilitating the turning of the box cover (3) and a second driving source (304) for driving the box cover (3) to turn.

10. The filtering device of the positive and negative pressure dual-action bipolar filtering and impurity removal method for liquid metal melt according to claim 3, characterized in that: It also includes a movable preheating device arranged at the flow channel inlet (105) and / or the flow channel outlet (205) for preheating the first filter box (1) and / or the second filter box (2).

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