CN113514304A - Multistage even reducing mechanism of sample is used in laboratory analytical test - Google Patents
Multistage even reducing mechanism of sample is used in laboratory analytical test Download PDFInfo
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- CN113514304A CN113514304A CN202110816201.9A CN202110816201A CN113514304A CN 113514304 A CN113514304 A CN 113514304A CN 202110816201 A CN202110816201 A CN 202110816201A CN 113514304 A CN113514304 A CN 113514304A
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- 238000004458 analytical method Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 7
- 238000003801 milling Methods 0.000 description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 5
- 235000017491 Bambusa tulda Nutrition 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 5
- 239000011425 bamboo Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000013522 software testing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- 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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a multistage uniform crushing device for samples for laboratory analysis and test, which comprises a crushing barrel, wherein the crushing barrel is placed on a working table surface, a retraction groove is formed in the outer side of the crushing barrel, a filter plate is connected to a joint shaft in the retraction groove, and a discharge hole is formed in the bottom of the crushing barrel; the sleeve is arranged on the outer side of the crushing barrel, a telescopic groove is formed in the inner wall of the sleeve, a guide rod of an arc-shaped structure is connected to the inner shaft of the telescopic groove, one end of the guide rod is connected to the outer side of the filter plate in an embedded mode, a positioning rod is fixed to the bottom of the inner wall of the sleeve and located in the positioning groove; the top cover is installed at the top of the crushing barrel, a micro motor is fixed on the top of the top cover through bolts, and a feeding hole is formed in the top of the top cover. This laboratory analytical test is with multistage even reducing mechanism of sample can carry out multistage even crushing and filter, realizes shaking the ejection of compact simultaneously, avoids the sample adhesion, and whole convenient dismantlement is washd.
Description
Technical Field
The invention relates to the technical field of laboratory analysis and test, in particular to a multistage uniform crushing device for a sample for laboratory analysis and test.
Background
In the laboratory, generally need carry out the analysis and test to the sample, conveniently carry out scientific research, the use of sample, for improving efficiency of software testing, can smash it, it is current commonly used means to adopt sample reducing mechanism, it smashes and hierarchical screening equipment to involve a laboratory soil sample in (CN 108827728A), including handle, host computer, motor, control circuit, power socket, arbor, blade, cup handle, sieve, buckle and material receiving box.
This laboratory soil sample smashes and sieves equipment in grades, smash and sieve work through blade and sieve, nevertheless inconvenient carry on multistage even crushing and screening, it is relatively poor to lead to the sample to smash and sieve the effect, influence follow-up analysis test result, this laboratory soil sample smashes and sieves equipment in grades simultaneously, though can dismantle the washing, inconvenient holistic dismantlement is washd, lead to inside sieve can't be washd, the sample remains, is unfavorable for next time experimental sample's crushing operation.
In order to solve the problems, innovative design is urgently needed on the basis of the original sample crushing device.
Disclosure of Invention
The invention aims to provide a multistage uniform crushing device for samples for laboratory analysis and test, and aims to solve the problems that the conventional sample crushing device in the background art is inconvenient to perform multistage uniform crushing and screening and is inconvenient to integrally disassemble and clean.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-stage uniform crushing device for samples for laboratory analysis and test comprises a crushing device, a crushing device and a crushing device, wherein the crushing device comprises a crushing device and a crushing device;
the crushing barrel is placed on the working table, a retraction groove is formed in the outer side of the crushing barrel, a filter plate is connected to the inner side of the retraction groove in a manner of being attached to a shaft, and a discharge hole is formed in the bottom of the crushing barrel;
the filter plate comprises a sleeve, a filter plate, a positioning groove, a reset spring and a filter plate, wherein the sleeve is arranged outside the crushing barrel, a telescopic groove is formed in the inner wall of the sleeve, a guide rod with an arc-shaped structure is connected in the telescopic groove in a shaft manner, one end of the guide rod is connected to the outer side of the filter plate in an embedded shaft manner, the positioning rod is fixed at the bottom of the inner wall of the sleeve and is positioned in the positioning groove, the positioning groove starts from the bottom of the outer side of the crushing barrel, and the reset spring is fixed between the positioning rod and the positioning groove;
the top cap is installed in the top of crushing barrel, the top bolt fastening of top cap has micro motor, and micro motor's output runs through the top cap and is connected with crushing pole to crushing pole is located crushing barrel, and the outside of crushing pole is fixed with crushing blade moreover, the top of top cap is provided with the feed inlet, and the bottom edge welding of top cap has the dead lever, and the dead lever is located the fixed slot, and the fixed slot begins in the top edge of crushing barrel moreover.
Preferably, the filter plate is in smashing a section of thick bamboo equal angle setting, and the filter plate has three groups from top to bottom equidistant distribution in smashing a section of thick bamboo to overlook the cross-section design of filter plate for the curved triangle-shaped structure of limit end, the just cross-section tip downward sloping setting of filter plate moreover, the filtration pore size of filter plate from top to bottom steadilys decrease in proper order simultaneously, carries out multistage filtration to the sample after the breakage through the filter plate, and the rotation of filter plate makes things convenient for the dismantlement and the installation of crushing pole and crushing blade simultaneously.
Preferably, the positioning rods are distributed in the sleeve at equal angles, elastically slide in the positioning grooves through the return springs, and are matched with the return springs to keep the sleeve to rotate and return to the original position.
Preferably, the outside of crushing pole is fixed with the push rod, and one side of push rod is provided with the cam to the cam rotates the cover through the torsional spring elasticity and locates on the installation pole, and on the installation pole was fixed in the inner wall of crushing section of thick bamboo moreover, the push rod followed crushing pole and rotated, contacted with the cam, drove the cam and rotated.
Preferably, the cams are located below the filter plate, the distribution number of the cams is the same as that of the filter plate, the length of each cam is larger than the distance between the installation rod and the bottom of the filter plate, and when the push rod loses the limitation on the cams, the cams rotate back to be in contact with the filter plate, so that the cams generate vibration, and a sample is prevented from being clamped during screening.
Preferably, the crushing blade is arranged on the crushing rod in an inclined mode, the end portions of the crushing blade and the end portions of the filter plates are parallel to each other, the distribution positions of the crushing blade correspond to the distribution positions of the filter plates, and the crushing rod drives the crushing blade to rotate so as to crush samples on the filter plates in a multi-stage mode.
Preferably, the dead lever is angle distribution such as arc in the bottom of top cap, and mutual block between dead lever and the fixed slot, through with the dead lever card go into in the fixed slot, carry out the location installation to the top cap.
Preferably, the outside of dead lever has been seted up and has been locked the groove, and lock inslot and be connected with the locking lever to the limit end of locking lever runs through crushing section of thick bamboo and passes through the pull rod axle and connect on telescopic inner wall, and the sleeve rotates, drives the locking lever through the pull rod and slides.
Preferably, the locking lever slides in crushing a section of thick bamboo through the telescopic rotation of pull rod, and the locking lever is the slope and sets up the block in locking inslot, and the locking lever card is gone into locking inslot, locks the position of dead lever, and then fixes the top cap.
Compared with the prior art, the invention has the beneficial effects that: the multi-stage uniform crushing device for the samples for laboratory analysis and test;
1. the sleeve is rotated through the sleeve arranged on the outer side of the crushing barrel, the guide rod of the arc-shaped structure moves and rotates in the telescopic groove, the filter plate of the arc-shaped triangular structure is driven to rotate in the retraction groove, the position of the filter plate is convenient to adjust, the crushing rod and the crushing blade at the bottom of the top cover are convenient to disassemble and install, and meanwhile, the position of the filter plate is exposed, so that the integral cleaning is facilitated;
2. through the pull rod arranged at the top of the sleeve, when the sleeve is rotated, the inclined locking rod can be driven by the pull rod to slide in the crushing barrel, the fixed rod in the fixed groove is locked through the insertion of the locking rod and the locking groove, the position of the top cover is fixed while the position of the filter plate is adjusted, and meanwhile, the positioning rod arranged in the sleeve slides in the positioning groove through the reset spring, so that the position of the sleeve can be reset and fixed, and the operation is convenient;
3. by arranging three groups of filter plates and crushing blades which are inclined downwards, when a sample on the filter plates is crushed by the crushing blades, the sample is filtered by the filter plates in multiple stages, and is crushed uniformly in multiple stages by the crushing blades, so that the crushing efficiency of the sample is improved;
4. through setting up the push rod in the broken pole outside of piece, it when following broken pole and rotate, with the cam contact, drive the cam and rotate, lose the restriction to the cam when continuing to rotate until the push rod, the cam elastically rotates on the installation pole and returns the normal position, contacts with the filter plate bottom, produces the vibration, effectively avoids the sample on the filter plate to block, improves screening efficiency.
Drawings
FIG. 1 is a schematic front sectional view of the present invention;
FIG. 2 is a schematic view of the filter plate structure of the present invention;
FIG. 3 is a schematic view of a filter plate according to the present invention in a top-down expanded configuration;
FIG. 4 is a schematic top view of a cross-sectional structure of a positioning rod according to the present invention;
FIG. 5 is an enlarged view of the structure at A in FIG. 1 according to the present invention;
FIG. 6 is a schematic top cross-sectional view of a locking bar according to the present invention;
fig. 7 is a schematic side view of the cam of the present invention.
In the figure: 1. a milling drum; 11. a retraction slot; 12. filtering the plate; 13. a discharge port; 2. a sleeve; 21. a telescopic groove; 22. a guide bar; 23. positioning a rod; 24. positioning a groove; 25. a return spring; 3. a top cover; 31. a micro motor; 32. a breaking bar; 321. a push rod; 322. a cam; 323. mounting a rod; 33. crushing the blade; 34. fixing the rod; 341. a locking groove; 342. a locking lever; 343. a pull rod; 35. fixing grooves; 36. and (4) feeding a material inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1-7, the present invention provides a technical solution: a multi-stage uniform sample crushing device for laboratory analysis and test comprises a crushing barrel 1, a collecting and releasing groove 11, a filter plate 12, a discharge hole 13, a sleeve 2, a telescopic groove 21, a guide rod 22, a positioning rod 23, a positioning groove 24, a return spring 25, a top cover 3, a micro motor 31, a crushing rod 32, a push rod 321, a cam 322, an installation rod 323, a crushing blade 33, a fixing rod 34, a locking groove 341, a locking rod 342, a pull rod 343, a fixing groove 35 and a feed inlet 36;
the crushing cylinder 1 is placed on a working table, a retraction groove 11 is formed in the outer side of the crushing cylinder 1, a filter plate 12 is connected to the retraction groove 11 in a joint shaft mode, and a discharge hole 13 is formed in the bottom of the crushing cylinder 1;
the sleeve 2 is arranged outside the crushing barrel 1, a telescopic groove 21 is formed in the inner wall of the sleeve 2, a guide rod 22 of an arc-shaped structure is connected to the inner shaft of the telescopic groove 21, one end of the guide rod 22 is connected to the outer side of the filter plate 12 in an embedded mode in a shaft, a positioning rod 23 is fixed to the bottom of the inner wall of the sleeve 2, the positioning rod 23 is located in a positioning groove 24, the positioning groove 24 begins at the bottom of the outer side of the crushing barrel 1, and a reset spring 25 is fixed between the positioning rod 23 and the positioning groove 24;
top cap 3, install in the top of crushing barrel 1, the top bolt fastening of top cap 3 has micro motor 31, and micro motor 31's output runs through top cap 3 and is connected with crushing pole 32, and crushing pole 32 is located crushing barrel 1, and the outside of crushing pole 32 is fixed with crushing blade 33 moreover, the top of top cap 3 is provided with feed inlet 36, and the welding of the bottom edge of top cap 3 has dead lever 34, and dead lever 34 is located fixed slot 35, and fixed slot 35 begins at the top edge of crushing barrel 1 moreover.
The filter plates 12 are arranged in the crushing barrel 1 at equal angles, three groups of filter plates 12 are distributed in the crushing barrel 1 at equal intervals from top to bottom, the overlooking section of each filter plate 12 is designed to be a triangular structure with arc-shaped side ends, the end part of the regular section of each filter plate 12 is arranged in a downward inclined mode, the sizes of filter holes of the filter plates 12 are sequentially decreased progressively from top to bottom, the crushing blades 33 are arranged on the crushing rods 32 in an inclined mode, the crushing blades 33 are parallel to the end parts of the filter plates 12, and the distribution positions of the crushing blades 33 correspond to the distribution positions of the filter plates 12;
as shown in fig. 1-3, firstly, clockwise rotating the sleeve 2 outside the milling barrel 1 to make the guide rod 22 rotate and rotate in the telescopic slot 21, the guide rod 22 driving the filter plate 12 to rotate out in the retraction slot 11 to expose the inner position of the milling barrel 1, then covering the top cover 3 on the milling barrel 1, inserting the crushing rod 32, the crushing blade 33 and the push rod 321 into the milling barrel 1, reversely rotating the sleeve 2, combining and folding three groups of filter plates 12, pouring the sample into the milling barrel 1 through the feed inlet 36 on the top cover 3, starting the micro motor 31, the micro motor 31 driving the crushing rod 32 and the crushing blade 33 to rotate, crushing the sample on the filter plate 12, and performing multi-stage screening on the crushed sample through the filter plate 12, and performing multi-stage crushing operation on the sample by matching with the three groups of crushing blades 33;
the positioning rods 23 are distributed in the sleeve 2 at equal angles, and the positioning rods 23 elastically slide in the positioning grooves 24 through the return springs 25;
as shown in fig. 1 and 4, when the sleeve 2 rotates, the positioning rod 23 rotates in the positioning groove 24 to position the position of the sleeve 2, and when the sleeve 2 rotates reversely, the elastic force of the return spring 25 pulls the positioning rod 23 and the sleeve 2 to the initial position, so as to keep the sleeve 2 stably used;
a push rod 321 is fixed on the outer side of the crushing rod 32, a cam 322 is arranged on one side of the push rod 321, the cam 322 is elastically sleeved on the mounting rod 323 through a torsion spring, the mounting rod 323 is fixed on the inner wall of the crushing barrel 1, the cam 322 is positioned below the filter plate 12, the distribution number of the cam 322 is the same as that of the filter plate 12, and the length of the cam 322 is greater than the distance between the mounting rod 323 and the bottom of the filter plate 12;
as shown in fig. 1 and 7, when the crushing rod 32 is driven by the micro motor 31 to rotate, the pushing rod 321 is driven to rotate, the pushing rod 321 contacts with the top of the cam 322 to drive the cam 322 to rotate, the pushing rod 321 loses the limitation on the cam 322 in the continuous rotation, and at this time, the cam 322 can rotate back up and contact with the bottom of the filter plate 12, so as to realize the vibrating screening of the filter plate 12 and avoid the sample from being blocked;
the fixing rods 34 are distributed at the bottom of the top cover 3 in an arc shape at equal angles, the fixing rods 34 are clamped with the fixing grooves 35, locking grooves 341 are formed in the outer sides of the fixing rods 34, locking rods 342 are connected in the locking grooves 341, the edge ends of the locking rods 342 penetrate through the crushing barrel 1 and are connected to the inner wall of the sleeve 2 through pull rods 343 in a shaft mode, the locking rods 342 slide in the crushing barrel 1 through the rotation of the sleeve 2 through the pull rods 343, and the locking rods 342 are obliquely arranged and clamped in the locking grooves 341;
as shown in fig. 1 and fig. 5-6, when the top cover 3 is installed, the fixing rod 34 at the bottom of the top cover 3 is vertically inserted into the fixing groove 35 to position and install the top cover 3, and at the same time, because the sleeve 2 is in a state after clockwise rotation, the sleeve 2 pulls the locking rod 342 to slide outwards through the pull rod 343, the locking rod 342 cannot influence the insertion of the fixing rod 34, after the belt is installed, the sleeve 2 returns to the original position, the locking rod 342 is forcibly inserted into the locking groove 341, and the position of the fixing rod 34 is locked and fixed, so that the sleeve 2 rotates, on one hand, the position of the filter plate 12 is adjusted, and on the other hand, the top cover 3 is fixed.
The working principle is as follows: when the multistage uniform crushing device for the sample for laboratory analysis and test is used, as shown in fig. 1-7, the sleeve 2 is rotated clockwise at first to drive the filter plate 12 to rotate outwards, then the top cover 3 is covered on the crushing cylinder 1, so that the crushing rod 32, the crushing blades 33 and the push rod 321 are inserted into the crushing cylinder 1 and correspond to the filter plate 12 in position, the sleeve 2 is rotated reversely to realize the folding of the filter plate 12 and the fixing of the top cover 3, the sample is poured into the crushing cylinder from the feed inlet 36, the micro motor 31 is started, the multistage crushing and screening are carried out through the three groups of crushing blades 33 and the filter plate 12, the sample is led out and collected from the discharge outlet 13, and meanwhile, the rotation of the push rod 321 is matched with the reciprocating rotation of the cam 322 to realize the vibrating screening of the filter plate 12, thereby completing a series of work.
Those not described in detail in this specification are within the skill of the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a laboratory analytical test is with multistage even reducing mechanism of sample which characterized in that includes:
the grinding cylinder (1) is placed on the working table, a retraction groove (11) is formed in the outer side of the grinding cylinder (1), a filter plate (12) is connected to the retraction groove (11) in a joint mode through a shaft, and a discharge hole (13) is formed in the bottom of the grinding cylinder (1);
the filter screen comprises a sleeve (2) which is arranged outside a crushing barrel (1), wherein a telescopic groove (21) is formed in the inner wall of the sleeve (2), a guide rod (22) with an arc-shaped structure is connected to the inner shaft of the telescopic groove (21), one end of the guide rod (22) is connected to the outer side of a filter plate (12) in an embedded mode in a shaft mode, a positioning rod (23) is fixed to the bottom of the inner wall of the sleeve (2), the positioning rod (23) is located in a positioning groove (24), the positioning groove (24) begins at the bottom of the outer side of the crushing barrel (1), and a reset spring (25) is fixed between the positioning rod (23) and the positioning groove (24);
top cap (3), install in the top of crushing barrel (1), the top bolt fastening of top cap (3) has micro motor (31), and the output of micro motor (31) runs through top cap (3) and is connected with crushing pole (32) to crushing pole (32) are located crushing barrel (1), and the outside of crushing pole (32) is fixed with crushing blade (33), the top of top cap (3) is provided with feed inlet (36), and the bottom edge welding of top cap (3) has dead lever (34), and dead lever (34) are located fixed slot (35), and fixed slot (35) begin in the top edge of crushing barrel (1) moreover.
2. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 1, wherein: the filter plate (12) is arranged in the crushing barrel (1) at equal angles, three groups of filter plates (12) are distributed in the crushing barrel (1) at equal intervals from top to bottom, the overlooking section of each filter plate (12) is designed into an arc-shaped triangular structure, the end part of the regular section of each filter plate (12) is downwards inclined, and the size of filter holes of each filter plate (12) is gradually reduced from top to bottom.
3. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 1, wherein: the positioning rods (23) are distributed in the sleeve (2) at equal angles, and the positioning rods (23) elastically slide in the positioning grooves (24) through return springs (25).
4. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 1, wherein: a push rod (321) is fixed on the outer side of the crushing rod (32), a cam (322) is arranged on one side of the push rod (321), the cam (322) is elastically sleeved on the mounting rod (323) in a rotating mode through a torsion spring, and the mounting rod (323) is fixed on the inner wall of the crushing barrel (1).
5. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 4, wherein: the cams (322) are positioned below the filter plates (12), the distribution number of the cams (322) is the same as that of the filter plates (12), and the length of the cams (322) is larger than the distance between the mounting rod (323) and the bottom of the filter plates (12).
6. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 1, wherein: the crushing blades (33) are arranged on the crushing rod (32) in an inclined mode, the crushing blades (33) are parallel to the end portions of the filter plates (12), and the distribution positions of the crushing blades (33) correspond to the distribution positions of the filter plates (12).
7. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 1, wherein: the fixing rods (34) are distributed at the bottom of the top cover (3) in an arc shape at equal angles, and the fixing rods (34) are clamped with the fixing grooves (35) mutually.
8. The multi-stage uniform crushing device for the samples for the laboratory analysis and test according to claim 1, wherein: locking groove (341) have been seted up in the outside of dead lever (34), and locking groove (341) in-connection has locking lever (342), and the limit end of locking lever (342) runs through crushing barrel (1) and is connected on the inner wall of sleeve (2) through pull rod (343) hub connection.
9. The multi-stage uniform sample crushing device for the laboratory analysis test according to claim 8, wherein: the locking rod (342) slides in the crushing barrel (1) through the pull rod (343) by the rotation of the sleeve (2), and the locking rod (342) is obliquely arranged and clamped in the locking groove (341).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110816201.9A CN113514304B (en) | 2021-07-20 | 2021-07-20 | Multistage even reducing mechanism of sample is used in laboratory analytical test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110816201.9A CN113514304B (en) | 2021-07-20 | 2021-07-20 | Multistage even reducing mechanism of sample is used in laboratory analytical test |
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| Publication Number | Publication Date |
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| CN113514304A true CN113514304A (en) | 2021-10-19 |
| CN113514304B CN113514304B (en) | 2022-09-23 |
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| CN202110816201.9A Expired - Fee Related CN113514304B (en) | 2021-07-20 | 2021-07-20 | Multistage even reducing mechanism of sample is used in laboratory analytical test |
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| CN113514304B (en) | 2022-09-23 |
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