CN114083587A - Fixed accurate divider of circular filter membrane - Google Patents
Fixed accurate divider of circular filter membrane Download PDFInfo
- Publication number
- CN114083587A CN114083587A CN202111372541.3A CN202111372541A CN114083587A CN 114083587 A CN114083587 A CN 114083587A CN 202111372541 A CN202111372541 A CN 202111372541A CN 114083587 A CN114083587 A CN 114083587A
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- China
- Prior art keywords
- filter membrane
- groove
- circular filter
- upper cover
- cutting
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 68
- 238000005520 cutting process Methods 0.000 claims abstract description 48
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 239000013618 particulate matter Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 abstract description 5
- 238000005192 partition Methods 0.000 abstract description 4
- 230000003044 adaptive effect Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract 1
- 239000002585 base Substances 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005303 weighing Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 238000011166 aliquoting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000003891 environmental analysis Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
- B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/01—Means for holding or positioning work
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
Abstract
The application provides a fixed accurate partition ware of circular filter membrane includes: an upper cover and a support platform; the upper surface of the upper cover is provided with a vertical groove extending in the radial direction, the upper part of the groove is a cutting knife groove, the lower part of the groove is a knife edge groove, and the width of the cutting knife groove is smaller than that of the knife edge groove; the inner surface of the upper cover is arranged in the pressing ring, the bottom of the blade groove is flush with the lower surface of the pressing ring, the supporting table is arranged to be adaptive to the upper cover and tightly buckled, and the top of the supporting table is supported on the lower surface of the pressing ring in a buckled state. The halving device can realize high-precision halving, quartering and octating of the circular filter membrane, meets the requirement of accurate sector halving of the circular filter membrane by common sampling analysis, improves the cutting precision and reduces the experimental error.
Description
Technical Field
The invention relates to the field of environmental analysis, in particular to a fixed circular filter membrane equal divider.
Background
Ambient air particulate matter such as PM2.5, PM10, TSP, etc. are important indicators of air quality. In off-line analysis and exposure evaluation, the particulate matter is typically filtered off using an air sampler onto a dedicated filter membrane. In parallel experiments, repeated experiments, and analysis of different components on particulate matter components, it is often necessary to quantitatively intercept the filter membrane carrying the particulate matter sample. The conventional cutting method such as folding cutting has large cutting error and is easy to cause pollution; in addition, the filter membrane sample cannot be completely utilized by punching and intercepting, and the cutting number is limited. For the most commonly used circular filters, the best solution is a fan-shaped bisection around the center of the circle. In addition, in order to reduce the blank of the metal background, a ceramic knife is generally selected for multiple cutting, and therefore, a filter membrane should be fixed in the cutting process. No such device is currently available.
Disclosure of Invention
This application provides a fixed accurate partition ware of circular filter membrane to the circular filter membrane of conventional use, can realize the halving of circular filter membrane high accuracy, the quartering, the octant, satisfies the requirement that general sample analysis carries out accurate fan-shaped partition to circular filter membrane, improves cutting accuracy, reduces experimental error.
In one aspect, the present application provides an accurate aliquot ware of fixed circular filter membrane, includes:
an upper cover and a support platform;
the upper surface of the upper cover is provided with a vertical groove extending in the radial direction, the upper part of the groove is a cutting knife groove, the lower part of the groove is a knife edge groove, and the width of the cutting knife groove is greater than that of the knife edge groove;
the pressing ring is arranged on the inner surface of the upper cover, the bottom of the blade groove is flush with the lower surface of the pressing ring,
the supporting table is arranged to be adaptive to and tightly buckled with the upper cover, and the top of the supporting table is supported on the lower surface of the compression ring in a buckling state.
In this application a possible implementation, the width of clamping ring slightly is less than the width in the region of filter membrane edge unloaded particulate matter, and the distance of the lower surface of clamping ring to the lower surface of upper cover is slightly less than or equal to a height of brace table.
In one possible implementation manner of the present application, the plurality of grooves intersect at the center of the upper surface of the upper cover, and horizontal included angles between adjacent grooves are 45 °.
In one possible implementation manner of the present application, the method further includes: the external cutter is used for cutting the filter membrane, and the thickness of the cutting edge and the back of the cutter of the external cutter is matched with the width and the height of the cutting cutter groove.
In this application a possible implementation, the width in cutting sword groove and the back of a knife width looks adaptation of external cutter, in the cutting state, cutting sword groove is used for guiding the cutter to get into, the cutting edge groove is used for fixed blade position.
In one possible implementation manner of the present application, an outer pin hole is formed in a side wall of the upper cover, and an inner pin hole corresponding to the outer pin hole is formed in an outer wall of the support table;
in the buckling state, the outer pin hole aligns with the inner pin hole, and the fixing pin inserts in the outer pin hole and the inner pin hole.
In one possible implementation manner of the present application, the method further includes: a base;
the supporting platform is fixed on the base.
In this application a possible implementation, the size of propping up the bench upper surface is the same with the filter membrane, and in the lock state, the clamping ring compresses tightly the filter membrane that tiles the upper surface of propping up the bench.
In a possible implementation manner of the application, the fixing pin is a cylindrical combined structure with a thin front end and a thick rear end; the base is a cylindrical combined structure with a thick lower end and a thin upper end.
In one possible implementation of the present application, the upper cover, the support platform and the fixing pin are made of inert, non-adhesive materials.
The utility model provides an accurate partition ware of fixed circular filter membrane has following beneficial technological effect:
aiming at the circular filter membrane used conventionally, the fixed type circular filter membrane accurate divider is provided, the circular filter membrane can be accurately divided into fan-shaped parts around the circle center, the cutting precision is improved, the experimental error is reduced, and the filter membrane is utilized to the maximum extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a perspective view of a fixed circular filter membrane precise aliquotter provided in the examples of the present application.
FIG. 2 is a front view of a fixed circular filter membrane precision aliquotter provided in embodiments of the present application.
Fig. 3 is a top view of a fixed circular filter membrane precise aliquot device according to an embodiment of the present disclosure in a snap-fit state.
FIG. 4 is a cross-sectional view of a fixed circular filter membrane precise aliquot appliance in a snap-fit configuration according to an embodiment of the present disclosure.
In the figure: 1. an upper cover of the halving device; 2. an equalizer base; 3. a support table; 4. pressing a ring; 5. cutting a cutter groove; 6. a blade groove; 7. an outer pin hole; 8. a fixing pin; 9. filtering the membrane; 10. an inner pin hole.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a fixed circular filter membrane accurate divider, which is described in detail below.
As shown in fig. 1-4, the fixed circular filter membrane precise equally dividing device provided by the embodiment of the present application includes an upper cover 1, a support table 3, a base 2 and a fixing pin 8.
Upper cover 1 is used for accurate location, and guide cutter equant filter membrane includes cutting sword groove 5, cutting edge groove 6, clamping ring 4 and outer pinhole 7.
As shown in fig. 3, four vertical grooves extending in the radial direction are formed in the upper surface of the upper cover 1, each groove intersects with the center of the upper surface of the upper cover 1, and horizontal included angles between adjacent grooves are 45 °. The groove is divided into an upper part and a lower part, the upper part is a cutting knife groove 5 used for guiding a cutting knife to enter and cut in an equal division mode, and the width of the cutting knife groove 5 is matched with the width of a knife back of the cutting knife entering the knife groove.
The lower part of the groove is a blade groove 6 with a narrow width for fixing the position of the blade, and the bottom of the blade groove 6 is flush with the lower surface of the pressing ring 4, as shown in fig. 2. The cutting pocket 5 has a width greater than that of the blade groove 6 and horizontal center lines thereof are parallel to each other.
The compression ring 4 is an annular pressure bearing table which is internally arranged on the inner surface of the upper cover 1 and is used for compressing and fixing the filter membrane sample 9 and preventing the filter membrane sample 9 from displacing in the cutting process. The width of the compression ring 4 is slightly smaller than that of the area which is not loaded with the particles at the edge of the filter membrane. The distance between the lower surface of the press ring 4 and the lower surface of the upper cover 1 is slightly less than or equal to the height of the support platform 3, as shown in fig. 1.
The outer pin hole 7 is arranged on the side wall of the upper cover 1 and is positioned below the pressing ring 4.
The supporting table 3 is used for supporting the filter membrane and the cutting edge and is arranged on the base 2, the diameter of the supporting table 3 is equal to that of the circular filter membrane and is matched with the outer diameter of the pressing ring 4, so that the supporting table 3 can be contained in the upper cover 1, and at the moment, the top of the supporting table 3 is supported on the lower surface of the pressing ring 4. The diameter of base 2 slightly is greater than the diameter of brace table 3, makes things convenient for handheld base 2 and 1 lock of upper cover and separation. The outer wall of the support platform 3 is provided with inner pin holes 10 corresponding to the outer pin holes 7, and when the filter membrane sample is loaded, the inner pin holes 10 are aligned with the outer pin holes 7, and the fixing pins 8 can be inserted, as shown in FIGS. 3 and 4.
The fixing pin 8 is a cylindrical combined structure with a thin front end and a thick rear end. The inner pin hole 10 and the outer pin hole 7 are sized to correspond to the diameter of the front end cylinder of the fixing pin.
The cutter (not shown in the figure) for cutting the filter membrane is a high-purity ceramic blade, and the thickness and the height of the back of the ceramic cutter are matched with the width and the height of the cutter groove.
The filter membrane 9 is placed on the supporting platform 3 of the aliquotter by using ceramic tweezers, the aliquotter upper cover 1 is covered, the base 2 and the upper cover 1 are relatively rotated, the inner pin hole 10 and the outer pin hole 7 are correspondingly rotated, and the fixing pin 8 is inserted into the pin hole. At this point, the clamping ring 4 has compressed the annular region of the filter membrane edge. The ceramic knife is placed vertically into the cutting knife slot 5 with the knife edge positioned in the knife edge slot 6 and the knife back positioned in the cutting knife slot 5. The cutter handle is rotated by taking the top of the blade as an axis to cut vertically downwards. And vertically taking out the ceramic knife to complete one halving. If a quarter cut is made, the entire divider is rotated 90 degrees to align the blade with another cut and the cutting operation is repeated. If the octant operation is performed, the cutting is performed along the other two cutting sipes 5 and the blade grooves 6. After the cutting is completed, the fixing pin 8 is pulled out, the upper cover 1 is taken down, the edge of the filter membrane 9 is clamped by tweezers, and the equally divided filter membrane 9 is taken out. After the contact surfaces of the support table 3 and the press ring 4 are wiped, the next filtration membrane can be equally divided.
The upper cover 1, the supporting table 3, the base 2 and the fixing pin 8 of the invention can be made of inert and non-adhesive materials, such as polytetrafluoroethylene, which has the characteristics of acid resistance, alkali resistance and low blank background. Can be used for analyzing most substances except perfluorinated compounds, such as metals, ions, conventional organic substances and the like.
The tweezers for clamping the filter membrane should be made of inert materials, such as ceramic tweezers or polytetrafluoroethylene tweezers.
The aliquoting effect of the aliquotter mentioned in the present invention can be evaluated in the following two ways. First, visual observation was performed. The method specifically comprises the following steps: all slits meet at a point with no excess. Any two filter membranes are basically overlapped after being stacked, and no obvious difference exists. Secondly, weighing method. And (3) weighing the whole filter membrane and the cut filter membrane one by using a high-precision electronic balance, such as a hundred thousand-position electronic balance. Weighing twice in parallel each time, wherein the difference between the two weighing times is not more than 0.04mg, and taking the average value as the mass. And (4) calculating the relative error of cutting of a certain filter membrane according to the formula (i).
In the formula I, EiRelative error of the i-th filter cut, i ═ 1, 2, … … n; n is the number of equal parts of the filter membrane; m is a unit ofiThe mass of the ith part of the filter membrane is divided equally; m is the mass of the whole filter membrane. To meet the analysis requirements, | EiThe | should be less than or equal to 5%.
The parallelism of an aliquot of the filter was calculated according to equation (II) and expressed as the Relative Standard Deviation (RSD).
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A fixed circular filter membrane accurate aliquot ware which characterized in that includes:
an upper cover (1) and a support table (3);
the upper surface of the upper cover (1) is provided with a vertical groove extending in the radial direction, the upper part of the groove is a cutting knife groove (5), the lower part of the groove is a knife edge groove (6), and the width of the cutting knife groove (5) is larger than that of the knife edge groove (6);
the pressing ring (4) is arranged on the inner surface of the upper cover (1), the bottom of the knife edge groove (6) is flush with the lower surface of the pressing ring (4),
the supporting table (3) is matched with the upper cover (1) to be tightly buckled, and the top of the supporting table (3) is supported on the lower surface of the pressing ring (4) in a buckled state.
2. The fixed circular filter membrane precise equally divider according to claim 1, characterized in that the width of the press ring (4) is slightly smaller than the width of the area of the filter membrane edge not loaded with particulate matter, and the distance from the lower surface of the press ring (4) to the lower surface of the upper cover (1) is slightly smaller than or equal to the height of the support table (3).
3. The fixed circular filter membrane precise equally divider according to claim 1 or 2, characterized in that a plurality of said grooves intersect at the center of the upper surface of the upper cover (1), and the horizontal included angles of adjacent grooves are both 45 °.
4. The fixed circular filter membrane precision aliquotter of claim 1 or 2, further comprising: the external cutter is used for cutting the filter membrane, and the thickness of the cutting edge and the back of the cutter of the external cutter is matched with the width and the height of the cutting knife groove (5).
5. The fixed circular filter membrane precise divider according to claim 4, characterized in that the width of the cutting knife groove (5) is matched with the width of the knife back of an externally arranged cutting knife, in a cutting state, the cutting knife groove (5) is used for guiding the cutting knife to enter, and the knife edge groove (6) is used for fixing the position of a knife edge.
6. The fixed circular filter membrane precise equally divider according to claim 1 or 2, characterized in that the side wall of the upper cover (1) is provided with outer pin holes (7), and the outer wall of the support table (3) is provided with inner pin holes (10) corresponding to the outer pin holes (7);
after the circular filter membrane is arranged on the upper surface of the support table (3), in a buckling state, the outer pin hole (7) is aligned with the inner pin hole (10), and the fixing pin (8) is inserted into the outer pin hole (7) and the inner pin hole (10).
7. The fixed circular filter membrane precision aliquotter of claim 1 or 2, further comprising: a base (2);
the supporting platform (3) is fixed on the base (2).
8. The fixed circular filter membrane precise aliquotter according to claim 1 or 2, wherein the size of the upper surface of the support table (3) is the same as that of the filter membrane (9), and in a buckled state, the pressing ring (4) presses the filter membrane (9) laid flat against the upper surface of the support table (3).
9. The fixed circular filter membrane precise equally divider according to claim 1 or 2, characterized in that the fixed pin (8) is a cylinder combination structure with a thin front end and a thick rear end; the base (2) is of a cylindrical combined structure with a thick lower end and a thin upper end.
10. The fixed circular filter membrane precise aliquotter according to one of claims 1 to 8, characterized in that the upper cover (1), the support table (3) and the fixing pins (8) are made of inert, non-stick material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111372541.3A CN114083587A (en) | 2021-11-18 | 2021-11-18 | Fixed accurate divider of circular filter membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111372541.3A CN114083587A (en) | 2021-11-18 | 2021-11-18 | Fixed accurate divider of circular filter membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114083587A true CN114083587A (en) | 2022-02-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111372541.3A Pending CN114083587A (en) | 2021-11-18 | 2021-11-18 | Fixed accurate divider of circular filter membrane |
Country Status (1)
| Country | Link |
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| CN (1) | CN114083587A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030201066A1 (en) * | 2002-04-29 | 2003-10-30 | Applied Optoelectronics, Inc. | Method and apparatus for demounting workpieces from adhesive film |
| CN204869033U (en) * | 2015-06-03 | 2015-12-16 | 山西省交通科学研究院 | A cutting anchor clamps for rotatory compaction test piece of bituminous mixture |
| CN208867318U (en) * | 2018-10-15 | 2019-05-17 | 南京信息工程大学 | A kind of Multifunction cutting diaphragm |
| CN209075505U (en) * | 2018-08-14 | 2019-07-09 | 李仕君 | A kind of Medical care medicine distribution device |
| CN210649963U (en) * | 2019-08-19 | 2020-06-02 | 腾景科技股份有限公司 | Multi-cutter cutting fixture with array placing function |
| CN211362478U (en) * | 2020-01-07 | 2020-08-28 | 河南理工大学 | Portable filter membrane cutting machine |
| CN113547567A (en) * | 2021-07-16 | 2021-10-26 | 四川省疾病预防控制中心 | Filter membrane cutter |
-
2021
- 2021-11-18 CN CN202111372541.3A patent/CN114083587A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030201066A1 (en) * | 2002-04-29 | 2003-10-30 | Applied Optoelectronics, Inc. | Method and apparatus for demounting workpieces from adhesive film |
| CN204869033U (en) * | 2015-06-03 | 2015-12-16 | 山西省交通科学研究院 | A cutting anchor clamps for rotatory compaction test piece of bituminous mixture |
| CN209075505U (en) * | 2018-08-14 | 2019-07-09 | 李仕君 | A kind of Medical care medicine distribution device |
| CN208867318U (en) * | 2018-10-15 | 2019-05-17 | 南京信息工程大学 | A kind of Multifunction cutting diaphragm |
| CN210649963U (en) * | 2019-08-19 | 2020-06-02 | 腾景科技股份有限公司 | Multi-cutter cutting fixture with array placing function |
| CN211362478U (en) * | 2020-01-07 | 2020-08-28 | 河南理工大学 | Portable filter membrane cutting machine |
| CN113547567A (en) * | 2021-07-16 | 2021-10-26 | 四川省疾病预防控制中心 | Filter membrane cutter |
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Application publication date: 20220225 |