A metal melt refining device integrating degassing and positive / negative pressure filtration.

Abstract

This utility model discloses a metal melt refining device integrating degassing and positive / negative pressure filtration. Its features include: a filter box; a partition wall plate disposed within the filter box, dividing the filter box into a first filter box and a second filter box; an internal through-channel disposed at the bottom of the partition wall plate, connecting the first and second filter boxes; a first filter device dividing the first filter box into a front chamber and a rear chamber; and a rotor assembly rotatably mounted at the bottom of the front chamber, capable of removing gas from the inside of the metal melt. The first and second filter boxes are each individually connected to a flow channel. This utility model utilizes the rotor assembly within the first filter box to inject inert gas during the stirring process of the metal melt, generating tiny inert bubbles that form an inert gas curtain that floats upwards, carrying away the gas in the metal melt. The metal melt then passes through the first and second filter devices for further filtration, thereby improving the quality and purification effect of the metal melt.

Description

Technical Field

[0001] This utility model relates to the technical field of metal melt filtration and degassing devices, specifically to a metal melt refining device that integrates degassing and positive and negative pressure filtration. Background Technology

[0002] For example, the invention patent authorized on May 15, 2020, with authorization announcement number CN107208179B, discloses an apparatus and method for removing unwanted inclusions from molten metal. The apparatus includes: a container having a metal shell and an internal structure made of a heat-resistant, insulating, and refractory material; a lid removably disposed on top of the container to keep the container sealed; the container having: an inlet chamber having an inlet opening to receive metal from a metal supply tank; and an outlet chamber having an outlet opening; an air evacuation device and a refractory filter are provided in the inlet chamber and / or the outlet chamber; the apparatus includes means for initiating the refractory filter by molten metal flowing in the opposite direction to the molten metal flow during filtration; the inlet chamber and the outlet chamber are arranged side by side and separated by a partition wall extending upward from the bottom of the container to a predetermined height; the container is connected parallel to the metal supply tank via transverse metal channel short posts, the channel short posts being disposed between the inlet opening and the outlet opening and the supply tank, respectively; the supply tank having a valve device near the outlet of the container and another valve device between the two channel short posts;

[0003] The above scheme has a single-stage filter design, which requires very high quality of the molten metal in the preceding process. If the quality of the molten metal in the preceding process is poor, it is very easy to cause the filter to become clogged. Moreover, the filter cannot remove the gas inside the molten metal. If the gas inside the molten metal is present, it is easy for bubbles to exist inside the cast workpiece, thereby reducing the quality of casting.

[0004] The flow channel is an integrated flow channel equipped with multiple gate devices. Because these gates operate inside the molten metal, gaps inevitably form between the gates and the flow channel due to incomplete sealing. These gaps cannot be detected during actual molten metal production, causing the inlet molten metal to flow directly to the outlet without passing through the filtration device. This results in metallurgical defects in the casting products, causing fatal damage to high-precision and advanced casting products. At the same time, the incomplete sealing during the casting process will draw in a large amount of air, greatly weakening the vacuum suction function, affecting the vacuum level, and thus seriously interfering with the formation of negative vacuum pressure.

[0005] Furthermore, the heating device is installed on the top of the filter chamber, which can easily lead to uneven heating of the molten metal when heating the inside of the chamber. This can cause blockages inside the filter chamber due to the solidification of the molten metal, reducing the casting efficiency. To address this, a molten metal refining device integrating degassing and positive / negative pressure filtration is proposed. Summary of the Invention

[0006] The purpose of this invention is to propose a metal melt refining device that integrates degassing and positive / negative pressure filtration to solve the above problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an apparatus for a metal melt refining process integrating degassing and positive / negative pressure filtration, characterized in that: it includes a filter box, a partition wall plate disposed within the filter box to divide the filter box into a first filter box and a second filter box, an internal through channel disposed at the bottom of the partition wall plate to pass through the first and second filter boxes, a first filter device to divide the first filter box into a front chamber and a rear chamber, and a rotor assembly rotatably mounted at the bottom of the front chamber to remove gas from the inside of the metal melt; the first and second filter boxes are each separately connected to a flow channel; the second filter box is also equipped with a negative pressure suction device for evacuating the first and second filter boxes, and a second filter device installed inside the second filter box.

[0008] Preferably, the flow channel includes an inlet flow channel that communicates separately with the first filter box and an outlet flow channel that communicates separately with the second filter box.

[0009] Preferably, the inlet flow channel and the outlet flow channel are respectively provided with an inlet channel and an outlet channel communicating with the first filter box and the second filter box, and the first filter box and the second filter box are respectively provided with an inlet port communicating with the inlet channel and an outlet port communicating with the outlet channel.

[0010] Preferably, the bottom of the second filter box is provided with a flow guide groove, which causes the molten metal flowing in from the internal through channel to flow in the following directions in sequence: vertically upward, horizontally to the side, vertically downward, and horizontally to the side before flowing to the outlet channel.

[0011] Preferably, the inlet flow channel, the outlet flow channel, the first filter box and / or the second filter box are all equipped with infrared liquid level rangefinders for real-time monitoring of the molten metal level; the inlet flow channel and the outlet flow channel are also equipped with sealing devices for sealing the first filter box and the second filter box respectively.

[0012] Preferably, each of the sealing devices includes a support rod installed on the first filter box and the second filter box respectively, a connecting rod movably installed on the support rod, and a sealing block and a driving source respectively connected to both ends of the connecting rod.

[0013] Preferably, the system further includes a positive pressure charging device for charging inert gas into the first filter box and / or the second filter box; the positive pressure charging device includes a gas charging pipe for charging inert gas into the first filter box and / or the second filter box, a control valve connected to the gas charging pipe, and a gas source pipeline connected to the control valve.

[0014] Preferably, the first and second filter boxes may also be fitted with flip-top covers to seal the first and second filter boxes.

[0015] Preferably, the system also includes a movable preheating device disposed at the inlet and / or outlet of the flow channel for preheating the first filter box and / or the second filter box.

[0016] The beneficial effects of this utility model are as follows: During the stirring of the molten metal by the rotor assembly in the first filter box, inert gas is introduced to generate tiny inert bubbles, forming an inert gas curtain that floats and rises, carrying out the gas in the molten metal. Then the molten metal passes through the first filter device and the second filter device for coarse and fine filtration, thereby further improving the quality and purification effect of the molten metal.

[0017] By repeatedly switching between the negative pressure suction device and the positive pressure filling 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 first filter and the second filter is extended.

[0018] The first and second filter boxes are each equipped with a separate, interconnected flow channel. This avoids the situation where, when using an integrated flow channel, the gate and the flow channel are not properly sealed, causing unfiltered molten metal to flow directly to the outlet, resulting in metallurgical defects in the casting process and causing fatal damage to high-precision and advanced casting products. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a cross-sectional view of the present invention.

[0021] Figure 3 This is a cross-sectional view of the first filter box of this utility model.

[0022] Figure 4 This is a cross-sectional view of the second filter box of this utility model.

[0023] Legend: 1. First filter box; 101. Front chamber; 102. Rear chamber; 103. Liquid inlet channel; 104. Liquid inlet passage; 105. Liquid inlet; 2. Second filter box; 201. Liquid outlet channel; 202. Liquid outlet passage; 203. Liquid outlet; 204. Guide channel; 3. Partition wall plate; 301. Internal through channel; 4. First filter device; 5. Rotor assembly; 6. Negative pressure suction device; 7. Second filter device; 8. Infrared liquid level rangefinder; 9. Sealing device; 901. Support rod; 902. Connecting rod; 903. Sealing block; 904. Drive source; 10. Positive pressure charging device; 11. Gas charging pipe; 12. Control valve; 13. Box cover; 14. Preheating device. Detailed Implementation

[0024] The following description, in conjunction with the accompanying drawings, further illustrates the metal melt refining process and apparatus that integrates degassing and positive / negative pressure filtration according to this utility model.

[0025] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0026] See appendix Figure 1-4 As shown, the apparatus for a metal melt refining process integrating degassing and positive / negative pressure filtration in this embodiment is characterized by: a filter box, a partition wall 3 disposed within the filter box to divide the filter box into a first filter box 1 and a second filter box 2, an internal through channel 301 disposed at the bottom of the partition wall 3 to pass through the first filter box 1 and the second filter box 2, a first filter device 4 dividing the first filter box 1 into a front chamber 101 and a rear chamber 102, and a rotor assembly 5 rotatably mounted at the bottom of the front chamber 101 and capable of removing gas from inside the metal melt; the first filter box 1 and the second filter box 2... Each of the two filter boxes 2 is connected to a separate flow channel; the second filter box 2 is also equipped with a negative pressure suction device 6 for evacuating the first filter box 1 and the second filter box 2, and a second filter device 7 installed inside the second filter box 2; during the stirring of the molten metal by the rotor assembly 5 in the first filter box 1, inert gas is introduced to generate tiny inert bubbles, forming an inert gas curtain that floats and rises, carrying out the gas in the molten metal. Then the molten metal passes through the first filter device 4 and the second filter device 7 for coarse and fine filtration, thereby further improving the quality and purification effect of the molten metal.

[0027] By repeatedly switching between the negative pressure suction device 6 and the positive pressure filling device 10, 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 first filter and the second filter is extended.

[0028] The first filter box 1 and the second filter box 2 are each equipped with a separate, interconnected flow channel. This avoids the situation where, when using an integrated flow channel, the unfiltered molten metal flows directly to the outlet due to poor sealing between the gate and the flow channel, causing metallurgical defects in the casting process and resulting in fatal damage to high-precision and advanced casting products.

[0029] See appendix Figure 3-4 As shown, the flow channel includes an inlet flow channel 103 that communicates separately with the first filter box 1 and an outlet flow channel 201 that communicates separately with the second filter box 2. The inlet flow channel 103 and the outlet flow channel 201 are respectively provided with an inlet channel 104 and an outlet channel 202 that communicate with the first filter box 1 and the second filter box 2. The first filter box 1 and the second filter box 2 are respectively provided with an inlet port 105 that communicates with the inlet channel 104 and an outlet port 203 that communicates with the outlet channel 202. The inlet flow channel 103 and the outlet flow channel 201 that communicate separately are provided on the first filter box and the second filter box, respectively, to avoid the situation where the molten metal does not flow directly to the outlet due to poor sealing between the gate and the flow channel when using an integrated flow channel, which would cause metallurgical defects in the casting products and cause fatal damage to high-precision casting products.

[0030] See appendix Figure 4 As shown, the bottom of the second filter box 2 is provided with a flow guide trough 204. The flow guide trough 204 causes the molten metal flowing in from the internal through channel 301 to flow in the following directions: vertically upward, horizontally to the side, vertically downward, and horizontally to the side, before flowing to the outlet channel 202. The molten metal entering the second filter box 2 is guided by the flow guide trough 203, so that the molten metal flows to the outlet flow channel 201 after being filtered by the second filter device 7.

[0031] See appendix Figure 3-4As shown, the inlet flow channel 103, the outlet flow channel 201, the first filter box 1, and / or the second filter box 2 are all equipped with infrared liquid level rangefinders 8 for real-time monitoring of the molten metal level; the inlet flow channel 103 and the outlet flow channel 201 are also equipped with sealing devices 9 for sealing the first filter box 1 and the second filter box 2 respectively; each sealing device 9 includes a support rod 901 installed on the first filter box 1 and the second filter box 2 respectively, a connecting rod 902 movably installed on the support rod 901, and sealing blocks 903 and a driving source 904 respectively connected to both ends of the connecting rod 902. The drive source 904 drives one end of the connecting rod 902 to move, and the connecting rod 902 drives the sealing block 903 to open or block the inlet flow channel 103 and the outlet flow channel 201, thereby facilitating the opening or blocking of the inlet and outlet flow channels; the infrared liquid level rangefinder 8 monitors the liquid level of the molten metal in the inlet flow channel 103, the outlet flow channel 201, the first filter box 1 and / or the second filter box 2 in real time, thereby facilitating the real-time monitoring of the liquid level of the molten metal in the inlet flow channel 103, the outlet flow channel 201, the first filter box 1 and / or the second filter box 2.

[0032] See appendix Figure 1 As shown, it also includes a positive pressure charging device 10 for charging inert gas into the first filter box 1 and / or the second filter box 2; the positive pressure charging device 10 includes a gas charging pipe 11 for charging inert gas into the first filter box 1 and / or the second filter box 2, a control valve 12 connected to the gas charging pipe 11, and a gas source pipeline connected to the control valve 12; by switching the control valve 12, the inert compressed gas in the gas source connected to the gas source pipeline is transported through the gas charging pipe 11 to the first filter box 1 and / or the second filter box 2, thereby purifying the first filter box 1 and / or the second filter box 2. The tank 2 is filled with positive pressure to lower the height of the molten metal in the tank. Then, the positive pressure filling device 10 stops working and the negative pressure suction device 6 is started to raise the height of the molten metal in the tank. By repeatedly switching between the opening and closing of the negative pressure suction device 6 and the positive pressure filling device 10, the positive and negative pressure are repeatedly switched, thereby ensuring the smooth flow of the filtration channels of the first filter device 4 and the second filter device 7, accelerating the flow rate of the molten metal through the filter devices, increasing the flow rate of the molten metal, and at the same time extending the service life of the first filter device 4 and the second filter device 7.

[0033] See appendix Figure 1-4As shown, the first filter box 1 and the second filter box 2 can also be fitted with flip-up covers 13 to seal the first filter box 1 and the second filter box 2; it also includes a movable preheating device 14 set at the inlet and / or outlet of the flow channel to preheat the first filter box 1 and / or the second filter box 2; by using the heating device to heat the first filter box 1 and the second filter box 2 at the inlet and / or outlet of the flow channel respectively, the molten metal inside the first filter box 1 and the second filter box is better kept warm, thereby improving the process conditions for multiple castings.

[0034] The working process of this utility model,

[0035] First, the heating device heats the first filter box 1 and the second filter box 2 at the inlet channel 104 of the inlet flow channel 103 and the outlet channel 202 of the outlet flow channel 201, respectively. After heating, the sealing cover 13 is flipped over. Then, the drive source 904 in the sealing device 9 at the separately connected inlet flow channel 103 on the first filter box 1 drives one end of the connecting rod 902 to move. The connecting rod 902 drives the sealing block 903 to open the inlet flow channel 103. The separately connected outlet flow channel 201 on the second filter box 2 remains blocked. At the same time, the molten metal flows from the inlet flow channel 103 through the inlet channel 104 and the inlet 105 into the first filter box 1. The rotor assembly 5 at the bottom of the filter box 1 is driven by a motor to rotate and simultaneously supplies inert gas into the molten metal. During the stirring of the molten metal by the rotor assembly 5, the inert gas generates tiny inert bubbles on the molten metal, forming an inert gas curtain. This inert gas curtain carries the gas out of the molten metal as it floats and rises. When the molten metal level measuring device at the top of the inlet channel detects that the height of the naturally flowing molten metal in the inlet channel has reached the set height value, the negative pressure suction device 6 is opened to perform vacuum suction on the first filter box 1. At the same time, the inert gas curtain floating above the first filter box 1 is drawn outward, and the molten metal inside the box is guided by negative pressure through vacuum suction.

[0036] The molten metal drawn in under negative pressure passes through the first filter device 4 in the first filter box 1. The first filter device 4 performs coarse filtration on the impurities in the molten metal, intercepting impurities larger than 20 micrometers. The filtered molten metal flows through the internal through-channel 301 to the guide channel 204 in the second filter box 2. The liquid level of the molten metal in the guide channel 204 rises and passes through the second filter device 7 for a second filtration, intercepting impurities smaller than 20 micrometers. When the infrared liquid level rangefinder 8 in the second filter box 2 detects the metal... When the liquid level of the melt reaches the set height, the negative pressure suction device 6 performs vacuum suction on the second filter box 2, the sealing device 9 at the liquid outlet channel 201 works, the drive source 904 drives one end of the connecting rod 902 to move, the connecting rod 902 drives the sealing block 903 to open the liquid outlet channel 201, and the molten metal after coarse and fine filtration flows through the liquid outlet 203 and the liquid outlet channel 202 into the liquid outlet channel 201 and then enters the casting stage. At this time, the liquid level of the molten metal at the liquid inlet channel 103 is the same as the liquid level of the molten metal at the liquid outlet channel.

[0037] When the molten metal level at the outlet flow channel 201 is lower than the molten metal level at the inlet flow channel 103, the sealing device 9 of the inlet flow channel 103 controls the flow of molten metal. Then, the negative pressure suction device 6 stops working and the positive pressure charging device 10 is started. By opening the control valve 12, inert gas enters the gas charging pipe 11 and charges the first filter box 1 and / or the second filter box 2 with inert gas, increasing the pressure in the first filter box 1 and the second filter box 2, and squeezing the molten metal downward. The molten metal in the second filter box 2 flows through the internal through channel 301 to the first filter box 1. The molten metal in the first filter box 11 flows to the inlet flow channel 103, lowering the molten metal level in the box. The molten metal, under pressure, passes through the first filter device 4 and the second filter device 7, increasing the filtration efficiency. Then, the positive pressure filling device 10 stops operating, and the negative pressure suction device 6 is activated to raise the molten metal level in the tank. Through the repeated switching between the negative pressure suction device 6 and the positive pressure filling device 10, positive and negative pressure are repeatedly switched, ensuring the filtration efficiency of the first filter device 4 and the second filter device 7, accelerating the flow rate of the molten metal through the filters, and increasing the flow rate of the molten metal. This ensures that the molten metal passing through the filters meets the flow requirements for the casting stage; simultaneously, it extends the service life of the first filter device 4 and the second filter device 7.

[0038] The structure of the rotor assembly in this utility model has been disclosed in publication numbers CN104818393B and CN104789796B, and therefore will not be described in detail in this invention.

[0039] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A metal melt refining device integrating degassing and positive / negative pressure filtration, characterized in that: The filter includes a filter housing, a partition wall (3) that divides the filter housing into a first filter housing (1) and a second filter housing (2) within the filter housing, an internal through channel (301) that runs through the first filter housing (1) and the second filter housing (2) at the bottom of the partition wall (3), a first filter device (4) that divides the first filter housing (1) into a front chamber (101) and a rear chamber (102), and a rotor assembly (5) that is rotatably mounted at the bottom of the front chamber (101) and can remove gas from the inside of the molten metal; the first filter housing (1) and the second filter housing (2) are each connected to a flow channel; the second filter housing (2) is also equipped with a negative pressure suction device (6) for evacuating the first filter housing (1) and the second filter housing (2) and a second filter device (7) installed inside the second filter housing (2).

2. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 1, characterized by: The flow channel includes an inlet flow channel (103) that communicates separately with the first filter box (1) and an outlet flow channel (201) that communicates separately with the second filter box (2).

3. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 2, characterized by: The inlet channel (103) and outlet channel (201) are respectively provided with an inlet channel (104) and an outlet channel (202) communicating with the first filter box (1) and the second filter box (2). The first filter box (1) and the second filter box (2) are respectively provided with an inlet port (105) communicating with the inlet channel (104) and an outlet port (203) communicating with the outlet channel (202).

4. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 3, characterized by: The bottom of the second filter box (2) is provided with a flow guide (204). The flow guide (204) causes the molten metal flowing in from the internal through channel (301) to flow in the direction of vertical upward, horizontal side, vertical downward and horizontal side before flowing to the liquid outlet channel (202).

5. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 3, characterized by: The inlet flow channel (103), outlet flow channel (201), first filter box (1) and / or second filter box (2) are all equipped with infrared liquid level rangefinders (8) for real-time monitoring of the molten metal level; the inlet flow channel (103) and outlet flow channel (201) are also equipped with sealing devices (9) for sealing the first filter box (1) and the second filter box (2) respectively.

6. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 5, characterized by: Each of the sealing devices (9) includes a support rod (901) installed on the first filter box (1) and the second filter box (2), a connecting rod (902) movably installed on the support rod (901), and a sealing block (903) and a driving source (904) respectively connected to the two ends of the connecting rod (902).

7. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 1, characterized by: It also includes a positive pressure charging device (10) for charging inert gas into the first filter box (1) and / or the second filter box (2); the positive pressure charging device (10) includes a gas charging pipe (11) for charging inert gas into the first filter box (1) and / or the second filter box (2), a control valve (12) connected to the gas charging pipe (11), and a gas source pipeline connected to the control valve (12).

8. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 1, characterized by: The first filter box (1) and the second filter box (2) can also be flipped up and fitted with a cover (13) to seal the first filter box (1) and the second filter box (2).

9. The gas removal, positive and negative pressure filtration integrated metal melt refining apparatus according to claim 1, characterized by: It also includes a movable preheating device (14) installed at the inlet and / or outlet of the flow channel to preheat the first filter box (1) and / or the second filter box (2).

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