CN211660032U - Filterable multifunctional centrifuge tube for step-by-step experiment - Google Patents
Filterable multifunctional centrifuge tube for step-by-step experiment Download PDFInfo
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- CN211660032U CN211660032U CN202020097953.5U CN202020097953U CN211660032U CN 211660032 U CN211660032 U CN 211660032U CN 202020097953 U CN202020097953 U CN 202020097953U CN 211660032 U CN211660032 U CN 211660032U
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Abstract
The utility model discloses a filterable multifunctional centrifuge tube for step-by-step experiments, which comprises a vertical barrel body for containing centrifugate, filtering components arranged at the bottom of the barrel body for filtering centrifugate after centrifugation and a metering component for measuring the centrifugate after centrifugation; the filter assembly comprises a connector arranged at the opening at the top of the cylinder bottom, a piston arranged at the bottom of the connector and used for plugging the connector, and a filter membrane horizontally arranged at the joint of the connector and the cylinder bottom; the utility model discloses a vertical setting is used for holding the barrel of dress centrifugate, all sets up the filter assembly who is used for filtering centrifugation back centrifugate in the barrel bottom and is used for carrying out measuring measurement subassembly to centrifugation back centrifugate, handles the centrifugate after the centrifugation, utilizes filter assembly can realize the separation of supernatant and insoluble substance, guarantees that solid particle is lossless to be retrieved, has ensured solid-liquid separation's high efficiency, has improved the purity of separation gained liquid and solid.
Description
Technical Field
The utility model belongs to the technical field of centrifugal experiment equipment, especially, relate to a can filter multi-functional centrifuging tube for experiment step by step.
Background
Centrifugation is a technique that uses centrifugal force to separate components of a liquid from solid particles or a mixture of liquid and liquid. Centrifugation is used primarily to separate solid particles from liquid in suspension; or separating two liquids with different densities and insoluble with each other in the emulsion (such as separating butter from milk); it can also be used to remove liquids from wet solids, such as by spin drying clothes in a washing machine; the special overspeed tubular separator can also separate gas mixtures with different densities; some settling centrifuges can also grade solid particles according to density or granularity by utilizing the characteristic that solid particles with different densities or granularities have different settling speeds in liquid.
Centrifugation is applied to departments such as chemical industry, oil, food, pharmacy, ore dressing, coal, water treatment and boats and ships in a large number, and various forms have appeared since the coming out as the required container of centrifugation, but do not have the centrifuging tube experimental apparatus that used of the current teaching experiment of separation liquid and solid that any centrifuging tube can be fine in the use, have following problem: 1. due to personal operation errors, suspended solid particles are mixed when supernatant liquid after centrifugation is poured out from a pipe orifice, so that the purity is relatively low; solid particles are not easy to take out after the supernatant is poured out; 2. when solid particles are taken out, the solid particles are easily adhered to the pipe wall to generate loss; 3. the withdrawn solid particles contain a large amount of liquid, resulting in a poor purity of the resulting solid particles. Therefore, a filterable multifunctional experimental device for step-by-step experiments is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed against, provide a can filter multi-functional centrifuging tube for experiment step by step, be used for holding the barrel of dress centrifugate through vertical setting, all set up and be in the barrel bottom is used for filtering after centrifugation the filter assembly of centrifugate with be used for to after the centrifugation the centrifugate carries out measuring subassembly, to after the centrifugation the centrifugate is handled, utilizes filter assembly can realize the supernatant with the separation of insoluble substance guarantees that solid particle is lossless to be retrieved, has ensured solid-liquid separation's high efficiency, has improved the purity of separation gained liquid and solid.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a but it filters multi-functional centrifuging tube to experiment step by step which characterized in that: the centrifugal liquid measuring device comprises a cylinder body which is vertically arranged and used for containing centrifugal liquid, filtering components which are arranged at the bottom of the cylinder body and used for filtering the centrifuged centrifugal liquid, and a metering component used for measuring the centrifuged centrifugal liquid;
the cylinder body comprises a cylinder wall and a cylinder bottom, the cylinder wall is vertically arranged, the cylinder bottom is arranged at the bottom of the cylinder wall and used for installing the filtering component, and the cylinder wall and the cylinder bottom are processed and manufactured into a whole; the centrifuge comprises a cylinder wall, a cylinder bottom, a cylinder cover, a cylinder bottom, a cylinder cover, a centrifugal liquid and a centrifugal liquid, wherein the cylinder wall is of a cylindrical structure with openings at two ends, the inner part of the cylinder cover is a hollow structure, the cylinder bottom is of a conical structure, the inner part of the cylinder bottom is of a hollow structure, the cylinder bottom is fixed in the cylinder wall and is arranged; the parts of the cylinder bottom and the cylinder wall, which are far away from the bearing area, jointly enclose an installation area for installing the filtering component, and the outer side of the cylinder wall is provided with a height scale mark for measuring supernatant after centrifugation of the centrifugate; a generatrix of the cylinder bottom is provided with a height scale mark for measuring insoluble substances after the centrifugation of the centrifugate;
the filter assembly comprises a connector arranged at an opening at the top of the cylinder bottom, a piston arranged at the bottom of the connector and used for plugging the connector, and a filter membrane horizontally arranged at the connection position of the connector and the cylinder bottom; the connector comprises a vertically arranged connector shell and a piston connecting piece vertically arranged at the bottom of the connector shell and used for mounting the piston, the connector shell is of a cylindrical structure with openings at two ends, and internal threads are formed in the inner side of the connector shell.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: the opening part at the top of the cylinder bottom is vertically provided with a filtering connecting piece, and the outer side of the filtering connecting piece is provided with an external thread matched with the internal thread on the connector shell.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: and the piston connecting piece is provided with a mounting opening for mounting the piston.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: the mounting hole and the piston are both of a round table-shaped structure, and the piston is a rubber plug.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: and a connector protective layer is arranged on the outer side of the piston connecting piece.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: and a filter membrane groove for installing a filter membrane is formed in the top of the piston connecting piece.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: the bottom of the installation area is provided with a plugging piece, the plugging piece comprises plugging connecting pieces and plugging heads, the plugging connecting pieces extend into the installation area and are connected with the cylinder wall, the plugging heads are used for plugging the installation area, and the plugging connecting pieces and the plugging heads are manufactured into a whole.
Foretell a can filter multi-functional centrifuging tube for experiment step by step, its characterized in that: the outer side of the plugging connecting piece is provided with an external thread, and the inner side of the cylinder wall is provided with an internal thread matched with the external thread on the plugging connecting piece; the inner side of the plugging connecting piece is provided with a bearing piece, and the outer side of the plugging connecting piece is provided with a plugging protective layer.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a vertical setting is used for holding the barrel of dress centrifugate, all sets up the barrel bottom is used for filtering after the centrifugation the filter assembly of centrifugate with be used for to the centrifugation after the centrifugate carries out measuring subassembly, to the centrifugation after the centrifugate is handled, utilizes filter assembly can realize the supernatant with the separation of insoluble substance guarantees that solid particle is lossless to be retrieved, has ensured solid-liquid separation's high efficiency, has improved the purity of separation gained liquid and solid.
2. In the utility model, the outer side of the cylinder wall is provided with a height scale mark for measuring the supernatant after the centrifugation of the centrifugate, and the height of the supernatant is measured; a generatrix of the cylinder bottom is provided with a height scale mark for measuring insoluble substances after the centrifugation of the centrifugate; the height of the insoluble substance is measured, the use is convenient, the centrifuged centrifugate can be accurately measured, and the experimental error is avoided.
3. The filter assembly comprises a connector arranged at the opening at the top of the cylinder bottom, a piston arranged at the bottom of the connector and used for plugging the connector, and a filter membrane horizontally arranged at the connection part of the connector and the cylinder bottom, wherein the filter membrane separates the centrifuged supernatant and the undissolved substances and retains the undissolved substances in the cylinder bottom; the supernatant can be discharged out of the cylinder body by pulling out the piston, so that the loss of solid particles during solid-liquid separation is avoided.
To sum up, the utility model discloses a vertical setting is used for holding the barrel of dress centrifugate, all sets up barrel bottom is used for filtering centrifugation back the filter assembly of centrifugate with be used for to the centrifugation back the centrifugate carries out measuring subassembly, to the centrifugation back the centrifugate is handled, utilizes filter assembly can realize the supernatant with the separation of insoluble substance guarantees that solid particle is lossless to be retrieved, has ensured solid-liquid separation's high efficiency, has improved the purity of separation gained liquid and solid.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the present invention.
Fig. 3 is a schematic structural diagram of the filter assembly of the present invention.
Description of reference numerals:
1, a cylinder body; 1-cylinder wall; 1-2-cylinder bottom;
2-1-connector housing; 2-piston connection; 2-2-1-mounting opening;
2-3-connector protective layer; 2-4-a filter membrane tank; 3-a piston;
4-a filtration membrane; 5-filtering connecting piece; 6, plugging parts;
6-1-plugging connecting piece; 6-1-a load-bearing member; 6-2-plugging head;
6-3-plugging a protective layer; 7-sealing plug.
Detailed Description
As shown in fig. 1 and 2, the centrifugal liquid filtering device comprises a cylinder body 1 vertically arranged for containing centrifugal liquid, filtering components arranged at the bottom of the cylinder body 1 and used for filtering the centrifugal liquid after centrifugation, and a metering component used for measuring the centrifugal liquid after centrifugation;
the cylinder body 1 comprises a cylinder wall 1-1 which is vertically arranged and a cylinder bottom 1-2 which is arranged at the bottom of the cylinder wall 1-1 and used for installing the filtering component, and the cylinder wall 1-1 and the cylinder bottom 1-2 are processed and manufactured into a whole; the cylinder wall 1-1 is a cylindrical structure with openings at two ends and the interior of the cylinder wall is a hollow structure, the cylinder bottom 1-2 is a conical structure and the interior of the cylinder bottom is a hollow structure, the cylinder bottom 1-2 is fixed in the cylinder wall 1-1 and is arranged at the bottom of the cylinder wall 1-1, the diameter of the bottom surface of the cylinder bottom 1-2 is equal to the inner diameter of the cylinder wall 1-1, an opening is arranged at the top point of the cylinder bottom 1-2, the interior of the cylinder wall 1-1 is communicated with the interior of the cylinder bottom 1-2, and the two form a containing area of the centrifugal liquid; the parts of the cylinder bottom 1-2 and the cylinder wall 1-1, which are far away from the bearing area, jointly enclose an installation area for installing the filtering component, and the outer side of the cylinder wall 1-1 is provided with a height scale mark for measuring supernatant after centrifugation of the centrifugate; a generatrix of the cylinder bottom 1-2 is provided with a height scale mark for measuring insoluble substances after centrifugation of the centrifugate;
the filter assembly comprises a connector arranged at the opening of the top point of the cylinder bottom 1-2, a piston 3 arranged at the bottom of the connector and used for plugging the connector, and a filter membrane 4 horizontally arranged at the joint of the connector and the cylinder bottom 1-2; the connector comprises a connector shell 2-1 which is vertically arranged and a piston connecting piece 2-2 which is vertically arranged at the bottom of the connector shell 2-1 and used for installing the piston 3, the connector shell 2-1 is of a cylindrical structure with two open ends, and internal threads are arranged on the inner side of the connector shell 2-1.
During the in-service use, carry out solid-liquid separation centrifuge later divide into the supernatant with the insoluble substance, be used for holding the barrel 1 of dress centrifugate, all set up through vertical setting 1 bottom of barrel is used for filtering after the centrifugation the filter assembly of centrifugate with be used for to the centrifugation after the centrifugate carries out measuring subassembly, to the centrifugation after the centrifugate is handled, utilizes filter assembly can realize the supernatant with the separation of insoluble substance guarantees that solid particle does not have the loss and retrieves, has ensured solid-liquid separation's high efficiency, has improved the purity of separation gained liquid and solid.
Wherein, the outer side of the cylinder wall 1-1 is provided with a height scale mark for measuring the supernatant after the centrifugation of the centrifugate, and the height of the supernatant is measured; a generatrix of the cylinder bottom 1-2 is provided with a height scale mark for measuring insoluble substances after centrifugation of the centrifugate; the height of the insoluble substance is measured, the use is convenient, the centrifuged centrifugate can be accurately measured, and the experimental error is avoided.
In addition, the filter assembly comprises a connector arranged at the top opening of the cylinder bottom 1-2, a piston 3 arranged at the bottom of the connector and used for plugging the connector, and a filter membrane 4 horizontally arranged at the joint of the connector and the cylinder bottom 1-2, wherein the filter membrane 4 is used for separating the centrifuged supernatant and the undissolved substances and trapping the undissolved substances in the cylinder bottom 1-2; the supernatant can be discharged out of the cylinder 1 by pulling out the piston 3, so that the loss of solid particles during solid-liquid separation is avoided.
During the in-service use, at first need will adorn this filterable multi-functional centrifuging tube of centrifugate and place centrifuge in, utilize after the centrifugation the measurement subassembly is right the supernatant with the insoluble substance is measured, opens piston 3 afterwards and will the supernatant passes through filtration membrane 4 and filters. The outer side of the top of the cylinder wall 1-1 is provided with an external thread matched with the sealing plug 7, the cylinder 1 is sealed by the plug 7, liquid is prevented from splashing during centrifugation, the height scale line on the outer side of the cylinder wall 1-1 is consistent with the height scale line on a bus of the cylinder bottom 1-2 in height, 50ml scale lines are selected at minimum, 100ml scale lines are selected at maximum, the height values of the centrifuged supernatant and the undissolved substances can be accurately read, and the volume of the supernatant and the undissolved substances is calculated by combining the inner diameter of the cylinder wall 1-1.
It should be noted that, when the centrifuged supernatant and the centrifuged insoluble substance are subjected to numerical value reading, the filterable multifunctional centrifuge tube is taken up to be flush with the sight line, the sight line is firstly aligned with the height scale mark on the generatrix of the tube bottom 1-2 for measuring the height of the insoluble substance, the height of the insoluble substance is read, then the filterable multifunctional centrifuge tube is moved to the lowest position of the concave liquid level of the supernatant to be flush with the height scale mark on the outer side of the tube wall 1-1, and the height of the supernatant is read.
Particularly, a filtering membrane 4 is horizontally arranged at the joint of the connector and the cylinder bottom 1-2, the supernatant in the bearing area is rapidly filtered under the action of gravity pressure difference, the experimental efficiency is improved, and meanwhile, due to the action of the filtering membrane 4, the residual insoluble substances such as coal slag and the like are retained for subsequent experiments, so that the resource waste and the random discarding of solid wastes are reduced. Utilize filtration membrane 4 to filter, compare with prior art, can realize the purpose that the solid particle is retrieved without the loss after the centrifugation, can guarantee solid-liquid separation's high efficiency, improved the purity of separating gained liquid and solid.
In this embodiment, a filtering connector 5 is vertically arranged at an opening at the top of the barrel bottom 1-2, and an external thread matched with the internal thread on the connector housing 2-1 is arranged on the outer side of the filtering connector 5.
During the in-service use, set up filter connector 5 is used for the installation filter assembly, through threaded connection convenient dismantlement and installation.
As shown in fig. 3, in this embodiment, the piston connector 2-2 is provided with a mounting opening 2-2-1 for mounting the piston 3.
In this embodiment, installing port 2-2-1 and piston 3 are round platform shape structure, piston 3 is the rubber buffer.
In actual use, the piston connecting piece 2-2 is made of plastic materials, the size of the piston 3 is larger than that of the mounting opening 2-2-1, and the piston 3-1 is connected with the piston connecting piece 2-2 by means of friction force between rubber and plastic and extrusion force between the piston 3-1 and the mounting opening 2-2-1. In order to facilitate the installation of the piston 3, a connecting plate can be arranged at the bottom of the piston 3, and the connecting plate is made of the same material as the piston 3, so that experimenters can conveniently take the piston 3 during the disassembly and installation.
In this embodiment, a connector protection layer 2-3 is disposed on the outer side of the piston connector 2-2.
As shown in fig. 3, the connector protection layer 2-3 is provided to protect the piston connector 2-2 and prevent damage to the piston connector 2-2 during the removal and installation of the plug member 6.
In the embodiment, the top of the piston connecting piece 2-2 is provided with a filter membrane groove 2-4 for installing a filter membrane 4.
In actual use, the filter membrane grooves 2-4 are used for placing the filter membrane 4 to filter the centrifugate so as to realize solid-liquid separation. Due to the fact that
As shown in fig. 2, in this embodiment, a plugging member 6 is disposed at the bottom of the installation area, the plugging member 6 includes a plugging connecting member 6-1 extending into the installation area and connected to the cylinder wall 1-1, and a plugging head 6-2 for plugging the installation area, and the plugging connecting member 6-1 and the plugging head 6-2 are integrally processed.
In the embodiment, the outer side of the plugging connecting piece 6-1 is provided with an external thread, and the inner side of the cylinder wall 1-1 is provided with an internal thread matched with the external thread on the plugging connecting piece 6-1; the inner side of the plugging connecting piece 6-1 is provided with a bearing piece 6-1-1, and the outer side of the plugging connecting piece 6-1 is provided with a plugging protective layer 6-3.
As shown in fig. 2, the plugging protection layer 6-3 is disposed on a portion of the plugging connecting piece 6-1 that does not extend into the installation area, and protects the plugging connecting piece 6-1. The blocking head 6-2 plays a role in supporting the cylinder wall 1-1 and can keep the cylinder wall 1-1 stable. The bearing member 6-1-1 can be used to support the barrel 1 and maintain the stability of the filterable multi-functional centrifuge tube.
When the multifunctional centrifugal tube is used, the filtering membrane 4 is required to be installed in the filtering membrane groove 2-4, the filtering component is installed at the bottom end of the multifunctional centrifugal tube capable of being filled with the filtering material and is perpendicular to the ground in a clockwise rotating mode, and the plugging piece 6 is installed at the bottom of the tube wall 1-1; adding a centrifugate into the filterable multifunctional centrifuge tube, covering the centrifugal tube with a sealing plug 7, and putting the filterable multifunctional centrifuge tube into a centrifuge for centrifugation.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (8)
1. The utility model provides a but it filters multi-functional centrifuging tube to experiment step by step which characterized in that: the centrifugal liquid centrifuge comprises a cylinder body (1) which is vertically arranged and used for containing centrifugal liquid, a filtering component which is arranged at the bottom of the cylinder body (1) and used for filtering the centrifuged centrifugal liquid, and a metering component used for measuring the centrifuged centrifugal liquid;
the filter assembly is characterized in that the barrel (1) comprises a barrel wall (1-1) which is vertically arranged and a barrel bottom (1-2) which is arranged at the bottom of the barrel wall (1-1) and used for installing the filter assembly, and the barrel wall (1-1) and the barrel bottom (1-2) are processed and manufactured into a whole; the cylinder wall (1-1) is of a cylindrical structure with openings at two ends and the interior of the cylinder wall is of a hollow structure, the cylinder bottom (1-2) is of a conical structure and the interior of the cylinder bottom is of a hollow structure, the cylinder bottom (1-2) is fixed in the cylinder wall (1-1) and is arranged at the bottom of the cylinder wall (1-1), the diameter of the bottom surface of the cylinder bottom (1-2) is equal to the inner diameter of the cylinder wall (1-1), an opening is formed at the top point of the cylinder bottom (1-2), the interior of the cylinder wall (1-1) is communicated with the interior of the cylinder bottom (1-2), and the cylinder bottom form a containing area of the centrifugal liquid; the barrel bottom (1-2) and the part of the barrel wall (1-1) far away from the bearing area jointly enclose an installation area for installing the filtering component, and the outer side of the barrel wall (1-1) is provided with a height scale mark for measuring supernatant after centrifugation of the centrifugate; a generatrix of the cylinder bottom (1-2) is provided with a height scale mark for measuring insoluble substances after centrifugation of the centrifugate;
the filter assembly comprises a connector arranged at the top opening of the cylinder bottom (1-2), a piston (3) arranged at the bottom of the connector and used for plugging the connector, and a filter membrane (4) horizontally arranged at the joint of the connector and the cylinder bottom (1-2); the connector comprises a connector shell (2-1) and a piston connecting piece (2-2), wherein the connector shell (2-1) is vertically arranged, the piston connecting piece (2-2) is vertically arranged at the bottom of the connector shell (2-1) and used for installing the piston (3), the connector shell (2-1) is of a cylindrical structure with two open ends, and internal threads are formed in the inner side of the connector shell (2-1).
2. The multi-functional centrifugal tube of claim 1, which can be used for stage-by-stage experiment and is characterized in that: the opening at the top point of the barrel bottom (1-2) is vertically provided with a filtering connecting piece (5), and the outer side of the filtering connecting piece (5) is provided with an external thread matched with the internal thread on the connector shell (2-1).
3. The multi-functional centrifugal tube of claim 1, which can be used for stage-by-stage experiment and is characterized in that: the piston connecting piece (2-2) is provided with a mounting opening (2-2-1) for mounting the piston (3).
4. The multi-functional centrifugal tube of claim 3 that can filter for stage experiment, its characterized in that: the mounting port (2-2-1) and the piston (3) are both in a round table structure, and the piston (3) is a rubber plug.
5. The multi-functional centrifugal tube of claim 1, which can be used for stage-by-stage experiment and is characterized in that: and a connector protective layer (2-3) is arranged on the outer side of the piston connecting piece (2-2).
6. The multi-functional centrifugal tube of claim 1, which can be used for stage-by-stage experiment and is characterized in that: and a filter membrane groove (2-4) for installing a filter membrane (4) is formed in the top of the piston connecting piece (2-2).
7. The multi-functional centrifugal tube of claim 1, which can be used for stage-by-stage experiment and is characterized in that: the bottom of the installation area is provided with a plugging piece (6), the plugging piece (6) comprises a plugging connecting piece (6-1) and a plugging head (6-2), the plugging connecting piece (6-1) extends into the installation area and is connected with the cylinder wall (1-1), the plugging head (6-2) is used for plugging the installation area, and the plugging connecting piece (6-1) and the plugging head (6-2) are processed and manufactured into a whole.
8. The multi-functional centrifuge tube of claim 7, wherein: the outer side of the plugging connecting piece (6-1) is provided with an external thread, and the inner side of the cylinder wall (1-1) is provided with an internal thread matched with the external thread on the plugging connecting piece (6-1); the inner side of the plugging connecting piece (6-1) is provided with a bearing piece (6-1-1), and the outer side of the plugging connecting piece (6-1) is provided with a plugging protective layer (6-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020097953.5U CN211660032U (en) | 2020-01-16 | 2020-01-16 | Filterable multifunctional centrifuge tube for step-by-step experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020097953.5U CN211660032U (en) | 2020-01-16 | 2020-01-16 | Filterable multifunctional centrifuge tube for step-by-step experiment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211660032U true CN211660032U (en) | 2020-10-13 |
Family
ID=72738049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020097953.5U Expired - Fee Related CN211660032U (en) | 2020-01-16 | 2020-01-16 | Filterable multifunctional centrifuge tube for step-by-step experiment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211660032U (en) |
-
2020
- 2020-01-16 CN CN202020097953.5U patent/CN211660032U/en not_active Expired - Fee Related
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Granted publication date: 20201013 Termination date: 20220116 |