CN219363826U - Rare earth molten salt electrolytic tank - Google Patents
Rare earth molten salt electrolytic tank Download PDFInfo
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- CN219363826U CN219363826U CN202320393621.5U CN202320393621U CN219363826U CN 219363826 U CN219363826 U CN 219363826U CN 202320393621 U CN202320393621 U CN 202320393621U CN 219363826 U CN219363826 U CN 219363826U
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Abstract
The utility model discloses a rare earth molten salt electrolytic cell, which comprises a cell-shaped graphite anode, a furnace bottom, an upper end cover, a separation sleeve and a tubular cathode; the groove-shaped graphite anode is provided with an accommodating space, and two ends of the accommodating space are provided with openings, namely an upper opening and a lower opening; the furnace bottom is arranged at the lower opening; the upper end cover is arranged at the upper opening; the top of the tubular cathode extends out of the upper end cover, and the bottom of the tubular cathode extends to the vicinity of the furnace bottom; the tubular cathode has a hollow structure; the separation sleeve is arranged between the tubular cathode and the groove-shaped graphite anode, so that the accommodating space is divided into a first chamber and a second chamber; the first chamber and the second chamber are in fluid communication; the top of the separation sleeve is fixed on the upper end cover, and the distance L between the bottom of the separation sleeve and the furnace bottom is greater than the distance M between the tubular cathode and the furnace bottom. The rare earth molten salt electrolytic tank is beneficial to improving the purity of electrolytic products.
Description
Technical Field
The utility model relates to a rare earth molten salt electrolytic tank.
Background
The rare earth molten salt electrolysis is a metallurgical process in which rare earth metal salts are melted and electrolyzed as an electrolyte to extract and purify rare earth metals.
CN105624736a discloses a rare earth molten salt electrolytic tank with a novel electrode structure, which comprises a hollow tank body, at least one row of anodes, cathodes with the same quantity as the anodes, cathode steel bars, metal grooves, a blanking device and graphite blocks are arranged in the tank body, the anodes are hung on the upper part of the electrolytic tank, the bottoms of the anodes are concave surfaces in the shape of inverted V, a row of cathodes are correspondingly arranged below each row of anodes, the cathodes are embedded into raised high-temperature corrosion-resistant materials, the tops of the cathodes are triangular prism bodies and protrude out of the high-temperature insulating materials, an electric insulating layer is arranged between the high-temperature corrosion-resistant materials and the cathodes, metal grooves formed by the high-temperature corrosion-resistant materials are arranged between every two cathodes, the cathode steel bars are positioned at the bottoms of the cathodes and are connected with the cathodes, the graphite blocks are filled between the cathode steel bars, an electric insulating layer is arranged between the graphite blocks and the cathode steel bars, and the blanking device is arranged on the top of the tank body. CN215209650U discloses a rare earth metal electrolytic tank, which comprises a housin, top cap and filter head, casing inside wall fixedly connected with firebrick layer, firebrick layer inside wall fixedly connected with graphite powder layer, inside wall fixedly connected with electrolysis trough in the graphite powder layer, electrolysis trough bottom fixedly connected with crucible, electrolysis trough opening part is provided with the top cap, top cap internally mounted has the motor, motor power take off end fixedly connected with transfer line, transfer line fixedly connected with (mixing) shaft, surface fixedly connected with blast pipe on the top cap. The purity of the liquid metal obtained by the electrolysis in the electrolytic cell is still further improved.
Disclosure of Invention
In view of this, the present utility model discloses a rare earth molten salt electrolyzer capable of further improving the purity of rare earth metals obtained by electrolysis. The utility model adopts the following technical scheme to realize the aim.
The utility model provides a rare earth molten salt electrolytic cell, which comprises a cell-shaped graphite anode, a furnace bottom, an upper end cover, a separation sleeve and a tubular cathode;
the groove-shaped graphite anode is provided with an accommodating space, and two ends of the accommodating space are provided with openings, namely an upper opening and a lower opening;
the furnace bottom is arranged at the lower opening and is used for closing the lower opening;
the upper end cover is arranged at the upper opening and is used for closing the upper opening;
the top of the tubular cathode extends out of the upper end cover, and the bottom of the tubular cathode extends to the vicinity of the furnace bottom; the tubular cathode has a hollow structure for conducting out electrolysis products;
the separation sleeve is arranged between the tubular cathode and the groove-shaped graphite anode, so that the accommodating space is separated into a first chamber and a second chamber; the space between the separation sleeve and the groove-shaped graphite anode is a first chamber, and the space between the separation sleeve and the tubular cathode is a second chamber; fluid communication between the first chamber and the second chamber; the first chamber is used for containing rare earth metal salt to be electrolyzed;
the top of the separation sleeve is fixed on the upper end cover, and the distance L between the bottom of the separation sleeve and the furnace bottom is greater than the distance M between the tubular cathode and the furnace bottom.
According to the rare earth molten salt electrolysis cell of the utility model, preferably, the central axis of the tubular cathode and the central axis of the separation sleeve are coincident with the central axis of the groove-shaped graphite anode.
The rare earth molten salt electrolyzer according to the utility model preferably further comprises a collecting tank arranged on the bottom of the furnace, between the separation sleeve and the tubular cathode, for collecting electrolysis products; the height H of the collecting groove is larger than the distance L between the bottom of the separation sleeve and the furnace bottom.
According to the rare earth molten salt electrolysis cell of the utility model, preferably, the central axis of the collecting tank coincides with the central axis of the tubular cathode.
According to the rare earth molten salt electrolytic tank, preferably, the separation sleeve is of an inverted truncated cone-shaped structure, and the cross section area of the separation sleeve is gradually increased from top to bottom.
According to the rare earth molten salt electrolysis cell of the present utility model, preferably, the partition sleeve is provided with a plurality of projections on the outer peripheral surface thereof.
According to the rare earth molten salt electrolyzer of the utility model, preferably, the plurality of projections are spirally distributed along the outer peripheral surface of the separation sleeve; the protrusions are strip-shaped.
The rare earth molten salt electrolysis cell according to the utility model, preferably:
the upper end cover is arranged to be rotatable;
the rare earth molten salt electrolysis cell further comprises a blanking unit which is arranged on the upper end cover; the blanking unit is communicated with the first chamber and is used for adding rare earth metal salt to be electrolyzed into the first chamber.
According to the rare earth molten salt electrolytic tank of the utility model, preferably, the discharging unit comprises a placing hopper, a cutoff pipe, a discharging control valve and a cover body; the material placing hopper, the cutoff pipe and the material discharging pipe are sequentially connected from top to bottom; the outlet end of the discharging pipe is communicated with the first chamber; the cover body is arranged on the placing hopper; the blanking control valve is arranged at the position of the intercepting pipe.
The rare earth molten salt electrolytic cell according to the present utility model preferably further comprises a liquid guide tube, a filter cartridge, a first gas port and a second gas port; the filter cartridge is arranged at the bottom of the tubular cathode and is used for filtering electrolysis products; the liquid guide pipe is communicated with the tubular cathode and is used for guiding out electrolysis products; the first air port and the second air port are arranged on the upper end cover; the first air port is communicated with the first chamber and is used for exhausting or introducing inert gas; the second gas port is communicated with the second chamber and is used for exhausting or introducing inert gas.
The rare earth molten salt electrolytic tank can improve the purity of rare earth metal obtained by electrolysis.
Drawings
FIG. 1 is a schematic diagram of a rare earth molten salt electrolyzer of the utility model.
Fig. 2 is a schematic view of the tubular cathode of the present utility model connected to a filter cartridge.
Fig. 3 is a schematic view of another spacer sleeve according to the present utility model.
The reference numerals are explained as follows:
100-rare earth molten salt electrolyzer; 101-groove-shaped graphite anode, 102-furnace bottom, 103-collecting tank, 104-upper end cover, 106-separating sleeve, 107-placing hopper, 108-intercepting pipe, 109-blanking control valve, 110-discharging pipe, 111-cover body, 112-first air port, 113-second air port, 121-tubular cathode and 122-wire.
Detailed Description
The rare earth molten salt electrolytic cell comprises a cell-shaped graphite anode, a furnace bottom, an upper end cover, a separation sleeve, a collecting tank, a tubular cathode, a blanking unit, a first gas port and a second gas port. Optionally, a filter cartridge, a catheter, and a wire. The following is a detailed description.
< grooved graphite anode, furnace bottom and Upper end cover >
The anode of the utility model is a groove-shaped graphite anode. The grooved graphite anode has an accommodation space. In certain specific embodiments, the grooved graphite anode is a hollow cylindrical structure having a receiving space. The two ends of the accommodating space are provided with openings, namely an upper opening and a lower opening. This makes it possible to form a space for accommodating the rare earth metal salt to be electrolyzed.
The furnace bottom is arranged at the lower opening and is used for closing the lower opening.
The upper end cover is arranged at the upper opening and is used for closing the upper opening. In certain embodiments, the upper end cap is configured to be rotatable. This facilitates the uniform addition of the rare earth metal salt to be electrolyzed into the first chamber. The upper end cover is provided with a first air port and a second air port.
< tubular cathode and Filter cartridge >
The cathode of the present utility model is a tubular cathode. The top of the tubular cathode extends out of the upper end cover. The bottom of the tubular cathode extends to the vicinity of the furnace bottom. The tubular cathode has a hollow structure for conducting the electrolysis products out. The tubular cathode of the present utility model may be used as both cathode and electrolyte product, i.e. liquid RE metal, may be led out through its middle structure.
In certain embodiments, a filter cartridge is disposed at the bottom of the tubular cathode. The filter cartridge is used for filtering the electrolysis product, so that the purity of the electrolysis product is further improved.
< separation sleeve >
The separation sleeve is arranged between the tubular cathode and the groove-shaped graphite anode, so that the accommodating space is divided into a first chamber and a second chamber. The space between the separating sleeve and the grooved graphite anode is a first chamber. The space between the separator sleeve and the tubular cathode is a second chamber. The first chamber is in fluid communication with the second chamber. I.e. a channel is formed between the bottom of the spacer sleeve and the furnace floor. The first chamber is for containing a rare earth metal salt to be electrolyzed. The top of the separation sleeve is fixed on the upper end cover, and the distance L between the bottom of the separation sleeve and the furnace bottom is greater than the distance M between the tubular cathode and the furnace bottom.
In the initial electrolysis, molten rare earth metal salt in a molten state is positioned in a second chamber and a first chamber, and the second chamber and the first chamber form a structure similar to a communicating vessel. As electrolysis proceeds, metal cations gradually enter the second chamber and form metal at the tubular cathode, anions enter the first chamber, and gas is formed at the grooved graphite anode.
According to one embodiment of the utility model, the central axis of the tubular cathode and the central axis of the separator sleeve are both coincident with the central axis of the grooved graphite anode.
In certain embodiments, the cross-sectional areas of the spacer sleeves are equal from top to bottom.
In other embodiments, the spacer sleeve is an inverted frustoconical structure. The cross-sectional area of the material increases gradually from top to bottom. The outer peripheral surface of the separation sleeve is provided with a plurality of bulges. The plurality of protrusions are spirally distributed along the outer peripheral surface of the separation sleeve. The bulges are strip-shaped. For example, the outer contour of the protrusion may be rectangular or parallelogram shaped. The separation sleeve with the structure can enable the rare earth metal salt to settle along the peripheral wall of the separation sleeve, delay the settlement speed, enable the bulges on the separation sleeve to play a role of disturbance, improve the mixing efficiency of the rare earth metal salt, and further improve the melting rate of the rare earth metal salt.
< collecting tank >
The collecting tank of the utility model is used for collecting electrolytic products, and is arranged on the bottom of the furnace. The collection trough is disposed between the separator sleeve and the tubular cathode. The height H of the collecting tank is larger than the distance L between the bottom of the separation sleeve and the furnace bottom. The tubular cathode extends into the lower part of the collecting tank. This ensures that the electrolytic product (e.g., liquid rare earth metal) accumulates in the collection tank. When the collecting tank is full of the electrolytic product, the pumping operation can be performed to lead the electrolytic product out of the hollow structure of the tubular cathode.
The above arrangement can avoid the mixing of the non-electrolyzed rare earth metal salt into the electrolysis product, thereby ensuring the high purity of the electrolysis product. In addition, the extracted electrolysis product has no residual rare earth metal salt, thereby improving the purity of the electrolysis product.
According to one embodiment of the utility model, the central axis of the collecting tank coincides with the central axis of the tubular cathode.
< baiting Unit >
The blanking unit is arranged on the upper end cover. The blanking unit is communicated with the first chamber and is used for adding rare earth metal salt to be electrolyzed into the first chamber.
The blanking unit comprises a material placing hopper, a cutoff pipe, a material discharging pipe, a blanking control valve and a cover body. The material placing hopper, the intercepting pipe and the material discharging pipe are sequentially connected from top to bottom. The outlet end of the discharging pipe is communicated with the first chamber. The cover body is arranged on the placing hopper. The blanking control valve is arranged at the cut-off pipe and used for controlling feeding.
In the utility model, the upper end cover rotates to drive the blanking unit to rotate, the rare earth metal salt to be electrolyzed enters the first cavity through the blanking unit and is uniformly distributed at the upper part of the first cavity along the circumferential direction of the first cavity, and then the rare earth metal salt is settled and melted to form a liquid state. The upper end cap may be rotated manually or by providing a sprocket apparatus.
< first and second ports >
In the utility model, the first air port and the second air port are arranged on the upper end cover. The first gas port is communicated with the first chamber and is used for exhausting or introducing inert gas. The second gas port is communicated with the second chamber and is used for exhausting or introducing inert gas. The first air port and the second air port are respectively arranged in the first chamber or the second chamber, and the exhaust state or the inert gas state of the first air port and the second air port is regulated, so that the purpose of improving the purity of the electrolytic product can be realized.
In the present utility model, the electrolysis product (i.e., liquid rare earth metal) resulting from the electrolysis is collected in the second chamber, and the gas resulting from the electrolysis is collected in the first chamber. As electrolysis proceeds, the liquid level in the first chamber gradually decreases and the liquid level in the second chamber gradually increases. When the channel communicated with the lower parts of the first chamber and the second chamber is also liquid rare earth metal, or when the liquid rare earth metal in the container for collecting metal is full, the liquid rare earth metal can be led out through the tubular cathode by vacuumizing and enters the ingot casting equipment through the liquid guide tube.
In the utility model, in the process of pumping the electrolysis product (namely liquid rare earth metal), the gas in the first cavity is gradually discharged through the first gas port, so that the phenomenon that the quality is influenced due to the fact that the non-electrolyzed rare earth metal molten salt is mixed into the liquid rare earth metal is avoided. And when the pressure in the first cavity is not higher than the external pressure, throwing the rare earth metal molten salt into the first cavity, and adjusting the pressure of the second cavity by introducing inert gas in the throwing process of the rare earth metal molten salt, so that the pressure of the second cavity is higher than the pressure of the first cavity, and further, the phenomenon that the non-electrolyzed rare earth metal molten salt is mixed into the second cavity is avoided. In the process of discharging liquid rare earth metal and throwing rare earth metal fused salt, the two steps do not influence the electrolytic process. Thus, the purity of the electrolytic product can be improved, and the electrolytic efficiency can be improved.
< catheter and guide wire >
The rare earth molten salt electrolytic cell of the utility model also comprises a liquid guide tube and a wire.
The liquid guide tube is communicated with the tubular cathode and is used for guiding out electrolysis products. For example, the molten metal may be discharged into an ingot casting facility to form a metal ingot of a predetermined specification.
One end of the lead is connected with the tubular cathode, and the other end is connected with the cathode of the power supply. The connection part of the tubular cathode and the lead is positioned above the upper end cover. The top end of the tubular cathode is provided with an insulating part which is positioned above the connecting part of the tubular cathode and the lead. Thus, the power is conveniently electrified to carry out rare earth metal molten salt electrolysis.
Example 1
FIG. 1 is a schematic diagram of a rare earth molten salt electrolyzer of the utility model. As shown in fig. 1, the rare earth molten salt electrolysis cell 100 of the present utility model includes a cell-like graphite anode 101, a furnace bottom 102, a collecting tank 103, an upper end cover 104, a spacer 106, a tubular cathode 121, a blanking unit, a liquid guide tube (not shown), a first gas port 112, and a second gas port 113.
The grooved graphite anode 101 has a hollow cylindrical structure. The hollow cylinder structure is provided with an accommodating space, and two ends of the hollow cylinder structure are provided with openings, namely an upper opening and a lower opening.
The furnace bottom 102 is disposed at the lower opening for closing the lower opening. An upper end cap 104 is disposed at the upper opening for closing the upper opening. The upper end cap 104 is rotatable.
The top of the tubular cathode 121 protrudes out of the upper end cap 104, for example, the tubular cathode 121 vertically penetrates the upper end cap 104. The bottom of the tubular cathode 121 extends to near the furnace floor 102. For example, the bottom of the tubular cathode 121 is adjacent the furnace floor 102. The tubular cathode 121 has a hollow structure. The hollow structure is used for leading out electrolysis products.
The partition sleeve 106 is disposed between the tubular cathode 121 and the grooved graphite anode 101, thereby dividing the accommodation space into a first chamber and a second chamber. The space between the spacer 106 and the grooved graphite anode 101 is a first chamber for accommodating the rare earth metal salt to be electrolyzed. The space between the spacer 106 and the tubular cathode 121 is the second chamber. The first chamber is in fluid communication with the second chamber.
The top of the spacer 106 is secured to the upper end cap 104. The distance L between the bottom of the spacer 106 and the furnace floor 102 is greater than the distance M between the tubular cathode 121 and the furnace floor 102.
The central axis of the tubular cathode 121 and the central axis of the separator 106 are coincident with the central axis of the grooved graphite anode 101.
A collection trough 103 is provided on the hearth 102. A collection tank 103 is located between the separator 106 and the tubular cathode 121 for collecting the electrolysis products. The height H of the collection trough 103 is greater than the distance L between the bottom of the spacer 106 and the floor 102. The central axis of the collecting tank 103 coincides with the central axis of the tubular cathode 121.
The blanking unit is disposed on the upper end cap 104. The blanking unit is communicated with the first chamber and is used for adding rare earth metal salt to be electrolyzed into the first chamber. The blanking unit comprises a placing hopper 107, a truncated tube 108, a blanking control valve 109, a discharging tube 110 and a cover 111. The material placing hopper 107, the cutoff pipe 108 and the material discharging pipe 110 are connected in sequence from top to bottom. The outlet of the tapping pipe 110 communicates with the first chamber. The hopper 107 is provided with a cover 111. The blanking control valve 109 is arranged at the truncated tube 108.
A drain (not shown) communicates with the tubular cathode 121 for draining the electrolysis products. The upper end cover 104 is provided with a first air port 112 and a second air port 113. The first gas port 112 communicates with the first chamber for venting or introducing an inert gas. The second port 113 communicates with the second chamber for venting or introducing an inert gas. One end of the wire 122 is connected to the tubular cathode 121, and the other end thereof is connected to a power source. The connection of the tubular cathode 121 and the wire 122 is located above the upper end cap 104.
Example 2
The procedure was as in example 1, except for the following structure:
fig. 2 is a schematic view of the tubular cathode of the present utility model connected to a filter cartridge. As shown in fig. 2, the rare earth molten salt electrolysis cell 100 further includes a filter cartridge 125. A filter cartridge 125 is provided at the bottom of the tubular cathode 121 for filtering the electrolysis product.
Example 3
The procedure was as in example 2, except for the following structure:
fig. 3 is a schematic view of another spacer sleeve according to the present utility model. As shown in fig. 3, the separation sleeve 106 of the rare earth molten salt electrolysis cell 100 of the present embodiment has an inverted truncated cone-shaped structure, the cross-sectional area of which gradually increases from top to bottom. A plurality of projections 126 are provided on the outer peripheral surface of the spacer 106. A plurality of projections 126 are spirally distributed along the outer peripheral surface of the spacer 106. The protrusions 126 are stripe-shaped and have an outer contour that is substantially rectangular or parallelogram-shaped.
Compared with the existing rare earth molten salt electrolytic tank, the purity of rare earth metal obtained by adopting the rare earth molten salt electrolytic tank can be improved by 0.3-0.8%.
The present utility model is not limited to the above-described embodiments, and any modifications, improvements, substitutions, and the like, which may occur to those skilled in the art, fall within the scope of the present utility model without departing from the spirit of the utility model.
Claims (10)
1. The rare earth molten salt electrolytic cell is characterized by comprising a cell-shaped graphite anode, a furnace bottom, an upper end cover, a separation sleeve and a tubular cathode;
the groove-shaped graphite anode is provided with an accommodating space, and two ends of the accommodating space are provided with openings, namely an upper opening and a lower opening;
the furnace bottom is arranged at the lower opening and is used for closing the lower opening;
the upper end cover is arranged at the upper opening and is used for closing the upper opening;
the top of the tubular cathode extends out of the upper end cover, and the bottom of the tubular cathode extends to the vicinity of the furnace bottom; the tubular cathode has a hollow structure for conducting out electrolysis products;
the separation sleeve is arranged between the tubular cathode and the groove-shaped graphite anode, so that the accommodating space is separated into a first chamber and a second chamber; the space between the separation sleeve and the groove-shaped graphite anode is a first chamber, and the space between the separation sleeve and the tubular cathode is a second chamber; fluid communication between the first chamber and the second chamber; the first chamber is used for containing rare earth metal salt to be electrolyzed;
the top of the separation sleeve is fixed on the upper end cover, and the distance L between the bottom of the separation sleeve and the furnace bottom is greater than the distance M between the tubular cathode and the furnace bottom.
2. The rare earth molten salt electrolysis cell of claim 1, wherein the central axis of the tubular cathode and the central axis of the separator sleeve both coincide with the central axis of the cell-like graphite anode.
3. The rare earth molten salt electrolysis cell of claim 1, further comprising a collection tank disposed on the bottom of the furnace, between the separator sleeve and the tubular cathode, for collecting electrolysis products; the height H of the collecting groove is larger than the distance L between the bottom of the separation sleeve and the furnace bottom.
4. A rare earth molten salt electrolysis cell according to claim 3, wherein the central axis of the collection cell coincides with the central axis of the tubular cathode.
5. The rare earth molten salt electrolyzer of claim 1 characterized in that the divider sleeve has an inverted truncated cone-shaped structure with a cross-sectional area that increases gradually from top to bottom.
6. The rare earth molten salt electrolyzer of claim 5 characterized in that a plurality of projections are provided on the outer peripheral surface of the divider sleeve.
7. The rare earth molten salt electrolyzer of claim 6 characterized in that the plurality of projections are spirally distributed along the outer peripheral surface of the divider sleeve; the protrusions are strip-shaped.
8. The rare earth molten salt electrolysis cell according to any one of claims 1 to 7, wherein:
the upper end cover is arranged to be rotatable;
the rare earth molten salt electrolysis cell further comprises a blanking unit which is arranged on the upper end cover; the blanking unit is communicated with the first chamber and is used for adding rare earth metal salt to be electrolyzed into the first chamber.
9. The rare earth molten salt electrolysis cell of claim 8, wherein the blanking unit comprises a hopper, a cutoff tube, a discharge tube, a blanking control valve and a cover; the material placing hopper, the cutoff pipe and the material discharging pipe are sequentially connected from top to bottom; the outlet end of the discharging pipe is communicated with the first chamber; the cover body is arranged on the placing hopper; the blanking control valve is arranged at the position of the intercepting pipe.
10. The rare earth molten salt electrolyzer of claim 9 further comprising a catheter, a filter cartridge, a first gas port, and a second gas port; the filter cartridge is arranged at the bottom of the tubular cathode and is used for filtering electrolysis products; the liquid guide pipe is communicated with the tubular cathode and is used for guiding out electrolysis products; the first air port and the second air port are arranged on the upper end cover; the first air port is communicated with the first chamber and is used for exhausting or introducing inert gas; the second gas port is communicated with the second chamber and is used for exhausting or introducing inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320393621.5U CN219363826U (en) | 2023-03-06 | 2023-03-06 | Rare earth molten salt electrolytic tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320393621.5U CN219363826U (en) | 2023-03-06 | 2023-03-06 | Rare earth molten salt electrolytic tank |
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| Publication Number | Publication Date |
|---|---|
| CN219363826U true CN219363826U (en) | 2023-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320393621.5U Active CN219363826U (en) | 2023-03-06 | 2023-03-06 | Rare earth molten salt electrolytic tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219363826U (en) |
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2023
- 2023-03-06 CN CN202320393621.5U patent/CN219363826U/en active Active
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