CN114279805B - Porous water bath concentrator - Google Patents
Porous water bath concentrator Download PDFInfo
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- CN114279805B CN114279805B CN202111422665.8A CN202111422665A CN114279805B CN 114279805 B CN114279805 B CN 114279805B CN 202111422665 A CN202111422665 A CN 202111422665A CN 114279805 B CN114279805 B CN 114279805B
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Abstract
The invention discloses a porous water bath concentrator, which comprises a water bath box, wherein a water bath groove is formed in the water bath box, an isolation disc is arranged in the water bath groove, water is contained below the isolation disc, a placement opening is formed in the isolation disc, a water bath pipe penetrates through the placement opening in the water bath groove, a heater is arranged at the bottom of the water bath groove and is used for heating water in the water bath groove, and the water bath pipe is connected with an external negative pressure device so as to heat and concentrate the water bath pipe. In summary, the above technical scheme has the following beneficial effects: the isolation disc is used for placing a water bath tube, the water bath tube is a test tube for containing samples or other containers which can be used for concentration, the water bath tube is heated in a water bath through a heater, and the temperature is controllable; the opening of the water bath pipe is connected with the negative pressure device so as to concentrate the sample, and the concentration mode can realize the stable and rapid concentration of the solvent sample with high boiling points such as methanol, acetonitrile and the like.
Description
Technical Field
The invention relates to the field of water bath concentration, in particular to a porous water bath concentration instrument.
Background
The nitrogen blowing instrument is also called a nitrogen rapid concentration instrument, and is widely used in the industries of pesticide residue analysis, food, environment and the like, in particular in the sample preparation of liquid phase, gas chromatography and mass spectrometry. The instrument can quickly, continuously and controllably blow nitrogen to the surface of the heated sample so as to accelerate the volatilization of the solvent in the sample to be treated and shorten the pretreatment time of the sample. However, the conventional nitrogen blowing instrument has weak sample processing capability for high boiling point solvents such as methanol, acetonitrile and the like, and long-time nitrogen blowing concentration is not beneficial to maintaining the stability of the sample.
Therefore, how to efficiently and stably concentrate a sample to be tested is a matter of the present application.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a porous water bath concentrator, which realizes rapid concentration of samples by controlling the temperature and improving the negative pressure of a water bath box.
In order to achieve the above purpose, the following technical scheme is provided:
the utility model provides a porous water bath concentrator, its is including the water bath box, the water bath groove has been seted up to the water bath box, be provided with the spacer disc in the water bath groove, the below of spacer disc is used for holding water, set up on the spacer disc and place the mouth, the water bath pipe passes in the water bath groove and places the mouth setting, the bottom of water bath groove is provided with the heater for water in the heating water bath groove, the water bath pipe is connected with outside negative pressure device, thereby heats the concentration to the water bath pipe.
In summary, the above technical scheme has the following beneficial effects: the isolation disc is used for placing a water bath tube, the water bath tube is a test tube for containing samples or other containers which can be used for concentration, the water bath tube is heated in a water bath through a heater, and the temperature is controllable; the opening of the water bath pipe is connected with the negative pressure device so as to concentrate the sample, and the concentration mode can realize the stable and rapid concentration of the solvent sample with high boiling points such as methanol, acetonitrile and the like.
Drawings
FIG. 1 is a schematic diagram of a porous water bath concentrator;
FIG. 2 is a schematic cross-sectional view showing a state of a porous water bath concentrator;
FIG. 3 is a schematic view of a porous water bath concentrator in a second cross-section;
FIG. 4 is a schematic diagram of the structure of a regulating device of the porous water bath concentrator;
FIG. 5 is a schematic diagram of the structure of the connector and the air extractor of the porous water bath concentrator;
FIG. 6 is a schematic diagram of the structure of the clamping end of a porous water bath concentrator;
FIG. 7 is a schematic diagram of the structure of a clamping sleeve and a regulating ring of the porous water bath concentrator;
FIG. 8 is a schematic diagram of the structure of the connecting through holes of the porous water bath concentrator;
FIG. 9 is a schematic diagram of the structure of the suction head of the porous water bath concentrator;
FIG. 10 is a schematic diagram of the structure of an isolation disc of the porous water bath concentrator;
FIG. 11 is a schematic view of the annular rim of a porous water bath concentrator;
FIG. 12 is a schematic diagram of the structure of a clamping ring of the porous water bath concentrator;
FIG. 13 is a schematic diagram of a chucking assembly of a porous water bath concentrator;
FIG. 14 is a schematic illustration of a cartridge constricting cross section of a porous water bath concentrator;
fig. 15 is a schematic drawing showing a block extension section of a porous water bath concentrator.
Reference numerals: 10. a water bath box; 11. a water bath; 12. a water storage chamber; 13. an adjusting device; 131. a pressure plate; 132. a handle; 14. ventilation holes; 20. a spacer disc; 21. a placement port; 22. a clamping groove; 23. an annular rim; 231. a boosting part; 232. a limit part; 30. a connector; 31. a clamping end; 311. a clamping sleeve; 3111. a top cover; 3112. a surrounding wall; 3113. a clamping piece; 3114. an external thread; 312. an adjusting ring; 3121. an internal thread; 3122. a protrusion; 32. a connection end; 33. a connecting through hole; 34. a rubber ring; 40. a clamping ring; 41. an annular groove; 42. a mounting port; 50. a clamping assembly; 51. a clamping block; 511. a friction part; 512. a reset section; 513. an inclined portion; 514. a vertical portion; 52. a reset member; 60. an air extracting head; 61. an insertion end; 62. a negative pressure end; 70. a water bath tube.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
As shown in FIG. 1, a porous water bath concentrator comprises a water bath box 10, a water bath tank 11 is arranged in the water bath box 10, an isolation disc 20 is arranged in the water bath tank 11, water is contained below the isolation disc 20, a containing opening 21 is arranged on the isolation disc 20, a water bath pipe 70 penetrates through the containing opening 21 in the water bath tank 11, a heater is arranged at the bottom of the water bath tank 11 and used for heating water in the water bath tank 11, and the water bath pipe 70 is connected with an external negative pressure device so as to heat and concentrate the water bath pipe 70. The isolation disc 20 is used for placing a water bath tube 70, the water bath tube 70 is a test tube for containing samples or other containers which can be used for concentration, the water bath tube 70 is heated in a water bath through a heater, and the temperature is controllable; the opening of the water bath pipe 70 is connected with a negative pressure device so as to concentrate the sample, and the concentration mode can realize the stable and rapid concentration of the high-boiling-point solvent sample containing methanol, acetonitrile and the like. The placing port 21 is provided with a plurality of water bath pipes 70 which can be simultaneously placed for water bath concentration, and each water bath pipe 70 is connected with the negative pressure device through a pipeline independently, so that mutual influence can be avoided.
As shown in fig. 2 and 3, a water storage cavity 12 is further formed in the water bath box 10, the bottom of the water storage cavity 12 is communicated with the bottom of the water bath 11, and an adjusting device 13 is arranged in the water storage cavity 12 and used for adjusting the water level in the water bath 11. The time for completing the concentration is different due to different conditions of each water bath pipe 70 when the water bath concentration is performed, and the number of water bath pipes 70 placed each time can be different, so that the water level in the water bath 11 can be changed, when part of the water bath pipes 70 are taken out, the water level is lowered and the rest water bath pipes 70 cannot be well covered, at this time, the water level in the water bath 11 can be raised by pressing the water in the water storage cavity 12 into the water bath 11 through the adjusting device 13, preferably, the water storage cavity 12 is arranged around the water bath 11, and the water in the water storage cavity 12 can uniformly flow from the periphery of the water bath 11 when the water storage cavity 12 is compressed.
As shown in fig. 4, the adjusting device 13 comprises a pressure plate 131 and a handle 132, the pressure plate 131 is arranged in the water storage cavity 12 and is tightly attached to the inner side wall of the water storage cavity 12, the water bath 11 is provided with air holes 14, the handle 132 is connected with the pressure plate 131 and penetrates through the air holes 14 to extend to the outside of the water storage cavity 12, and when the pressure plate 131 is controlled to rise, the water level of the water bath 11 is reduced; when the control platen 131 descends, the water level of the water bath 11 rises. The periphery of the pressure plate 131 is provided with a sealing layer, such as a rubber layer or other material capable of sealing and waterproofing, and water can be sucked into the water storage cavity 12 or pressed out to the water bath 11 through the cooperation of the handle 132 and the pressure plate 131. The handle 132 is provided with scales, the scales correspond to the change relation between the water level of the water storage tank and the water level of the water storage tank, namely, the handle 132 is pressed down to the height that the water level of the water outlet tank rises according to the numerical value corresponding to the corresponding scales.
As shown in fig. 5, a detachable connector 30 is provided at the opening of the water bath pipe 70, and the connector 30 is used for connecting an external negative pressure device. The external negative pressure device is connected with the water bath pipe 70 through the connector 30 and pumps air to the water bath pipe 70, when the water bath pipe 70 is used, the connector 30 can be conveniently connected to the opening of the water bath pipe 70, and the water bath pipe 70 is a test tube or other container capable of being used for concentration.
As shown in fig. 6, the connector 30 includes a clamping end 31 and a connecting end 32, the clamping end 31 is detachably connected with the water bath tube 70, the clamping end 31 is provided with a connecting through hole 33, the connecting end 32 is tubular and fixedly arranged at the connecting through hole 33 on the clamping end 31, and the connecting end 32 is used for connecting an external negative pressure device. In use, the clamping end 31 can be connected to the opening of the water bath pipe 70, and then the air pipe of the negative pressure device is connected to the connecting end 32 to perform negative pressure concentration on the water bath pipe 70.
As shown in fig. 7, the clamping end 31 comprises a clamping sleeve 311 and an adjusting ring 312, the clamping sleeve 311 is used for being sleeved on the pipe orifice of the water bath pipe 70, the adjusting ring 312 is used for adjusting the caliber of the clamping sleeve 311 so as to clamp the water bath pipe 70, the connecting through hole 33 is arranged on the clamping sleeve 311, and the connecting end 32 is fixedly arranged at the connecting through hole 33 on the clamping sleeve 311. The adjusting ring 312 is detachably connected with the clamping sleeve 311, the aperture of the adjusting ring 312 is fixed, and the inner diameter of the clamping sleeve 311 can be adjusted by moving the adjusting ring 312 up and down on the clamping sleeve 311, so that the water bath pipe 70 is clamped or the water bath pipe 70 is loosened.
As shown in fig. 8, the clamping sleeve 311 comprises a top cover 3111, a surrounding wall 3112 and a plurality of clamping pieces 3113, the top cover 3111 is arranged on the surrounding wall 3112, the clamping pieces 3113 are uniformly arranged on the lower edge of the surrounding wall 3112, the clamping pieces 3113 are in a sector shape equal to the curvature of the surrounding wall 3112, the thickness of the upper end of the clamping pieces 3113 is equal to the thickness of the lower edge of the surrounding wall 3112, the thickness of the lower end of the clamping pieces 3113 is larger than the thickness of the upper end, the aperture of the adjusting ring 312 is equal to the outer diameter of the surrounding wall 3112, and when the clamping sleeve 311 moves from the upper end to the lower end of the clamping pieces 3113, the clamping pieces 3113 gradually shrink towards the inner side of the surrounding wall 3112, so as to clamp the water bath tube 70; a connection through hole 33 is provided on the top cover 3111, and a connection end 32 is fixedly provided at the connection through hole 33 on the top cover 3111. The junction of the clip 3113 and the wall 3112 can be slightly bent to allow movement of the clip 3113, the more the clip 3113 gathers as the adjustment ring 312 moves toward the lower end of the clip 3113.
The inner side wall of the adjusting ring 312 is provided with an internal thread 3121, the outer side of each clip 3113 is provided with an external thread 3114 which is matched with the internal thread 3121, and the adjusting ring 312 is matched with the external thread 3114 on each clip 3113 through the internal thread 3121 so as to control the shrinkage of the clip 3113. In use, the enclosure wall 3112 is sleeved on the water bath pipe 70, the adjusting ring 312 passes through the enclosure wall 3112, the adjusting ring 312 is rotated to tighten each clamping piece 3113 to clamp the water bath pipe 70, and each clamping piece 3113 can be tightened more effort-effectively through threaded fit of the adjusting ring 312 and each clamping piece 3113.
Two protrusions 3122 for rotation extend from the outer sidewall of adjustment ring 312. The protrusions 3122 may facilitate manual rotation of the adjustment ring 312.
The inner side walls of the enclosure wall 3112 and the inner side of each clip 3113 are provided with an elastic sealing layer. The elastic sealing layer is a rubber layer or other materials capable of playing a sealing role.
As shown in fig. 9, the vacuum pump further comprises a vacuum pump 60 for connecting the external negative pressure device and the connecting end 32, the vacuum pump 60 comprises an insertion end 61 and a negative pressure end 62, the insertion end 61 is used for being inserted into the water bath pipe 70 through the connecting end 32, and the negative pressure end 62 is used for connecting the pipeline of the external negative pressure device. A rubber ring 34 is disposed within the connecting end 32. After the insertion end 61 is inserted into the water bath pipe 70, the negative pressure device sucks air into the water bath pipe 70 through the negative pressure end 62, when the insertion end 61 is pulled out, the rubber ring 34 in the connecting end 32 can isolate the water bath pipe 70 from the external connection, so that the water bath pipe 70 is kept in a negative pressure state, and the concentration of samples in the water bath pipe 70 can be accelerated when the negative pressure device is not connected.
As shown in fig. 10, the isolation disc 20 is provided with two clamping grooves 22 communicated with the placement openings 21 at the placement openings 21. The clamping groove 22 is matched with the protrusion 3122, the water bath pipe 70 is placed in the inner opening of the placing opening 21, the protrusion 3122 is embedded into the clamping groove 22 of the device, and the clamping piece 3113 can be folded to clamp the water bath pipe 70 by rotating the surrounding wall 3112.
As shown in fig. 11 and 12, the device further comprises a clamping ring 40, an annular groove 41 is formed in the inner side wall of the clamping ring 40, an annular edge 23 clamped with the annular groove 41 extends outwards from the outer side wall of the isolation disc 20, a mounting opening 42 communicated with the annular groove 41 is formed in the outer side wall of the clamping ring 40, a movable clamping assembly 50 is arranged in the mounting opening 42, and the isolation disc 20 is used for controlling the clamping assembly 50 to move outwards so as to be clamped with the water bath 11. The height of the isolation disc 20 in the water bath 11 can be adjusted at will through the clamping assembly 50, the height is adjusted according to the height of the water bath pipe 70, when the water bath pipe 70 is used, the water bath pipe 70 passes through the placement opening 21, the bottom of the water bath pipe 70 contacts the bottom of the water bath 11, then the isolation disc 20 is moved to the pipe orifice close to the water bath pipe 70, after the clamping sleeve 311 and the adjusting ring 312 are placed, the protrusions 3122 on the adjusting ring 312 can be embedded into the clamping groove 22, and accordingly the adjusting ring 312 and the clamping piece 3113 can be conveniently controlled to be matched and screwed through rotating the clamping sleeve 311.
13-15, the clamping assembly 50 comprises a clamping block 51 and a reset piece 52, the annular edge 23 comprises a boosting part 231 and a limiting part 232, the clamping block 51 is movably arranged in the mounting opening 42, and when the isolation disc 20 rotates along one direction, the boosting part 231 drives the clamping block 51 to move towards the outer side of the mounting opening 42; when the spacer 20 is rotated in the other direction, the restoring member 52 moves the latch 51 toward the annular groove 41 on the inner side and completes the restoration, and the limiting portion 232 is used to limit the spacer 20 to continue to rotate in the direction when the restoration of the latch 51 is completed. Preferably, the boosting part 231 drives the clamping block 51 to move towards the outer side of the mounting opening 42 when the isolating disc 20 is rotated clockwise at the left side of the limiting part 232, so as to clamp the inner wall of the water bath 11, and the reset piece 52 drives the clamping block 51 to move towards the annular groove 41 at the inner side when the isolating disc 20 is rotated anticlockwise until the limiting part 232 contacts with the clamping block 51 to complete reset. The latch 51 is provided with a plurality of, preferably four, latch 51 of different orientations, and each latch 51 is provided with a reset piece 52, a boosting portion 231 and a limiting portion 232 engaged therewith.
The latch block 51 includes a friction part 511, a reset part 512, an inclined part 513 and a vertical part 514, and when the isolating disc 20 is rotated clockwise to make the inclined part 513 act on the boosting part 231, the friction part 511 moves to the outside of the mounting opening 42; when the isolation disc 20 is rotated anticlockwise, the reset piece 52 acts on the reset portion 512 to drive the friction portion 511 to move into the mounting opening 42 until the limiting portion 232 contacts the vertical portion 514 to complete resetting of the friction portion 511. Two resetting portions 512 of each clamping block 51 are provided, and each resetting portion 512 corresponds to one resetting piece 52, and the resetting piece 52 is an elastic object, such as a spring.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (6)
1. The utility model provides a porous water bath concentrator, its characterized in that, including water bath box (10), water bath (11) have been seted up to water bath box (10), be provided with isolation dish (20) in water bath (11), the below of isolation dish (20) is used for holding water, set up on isolation dish (20) and place mouth (21), water bath pipe (70) pass in water bath (11) and place mouth (21) setting, the bottom of water bath (11) is provided with the heater for heating the water in water bath (11), water bath pipe (70) are connected with outside negative pressure device, thereby heat concentration to water bath pipe (70);
a water storage cavity (12) is further formed in the water bath box (10), the bottom of the water storage cavity (12) is communicated with the bottom of the water bath tank (11), and an adjusting device (13) is arranged in the water storage cavity (12) and used for adjusting the water level in the water bath tank (11);
the adjusting device (13) comprises a pressure plate (131) and a handle (132), the pressure plate (131) is arranged in the water storage cavity (12) and is tightly attached to the inner side wall of the water storage cavity (12), the water bath box (10) is provided with air holes (14), the handle (132) is connected with the pressure plate (131) and penetrates through the air holes (14) to extend to the outside of the water storage cavity (12), and when the pressure plate (131) is controlled to ascend, the water level of the water bath tank (11) is lowered; when the pressure plate (131) is controlled to descend, the water level of the water bath (11) rises;
the novel water bath device is characterized by further comprising a clamping ring (40), wherein an annular groove (41) is formed in the inner side wall of the clamping ring (40), an annular edge (23) clamped with the annular groove (41) extends outwards from the outer side wall of the isolation disc (20), a mounting opening (42) communicated with the annular groove (41) is formed in the outer side wall of the clamping ring (40), a movable clamping assembly (50) is arranged in the mounting opening (42), and the isolation disc (20) is used for controlling the clamping assembly (50) to move outwards so as to be clamped with the water bath (11);
the clamping assembly (50) comprises a clamping block (51) and a reset piece (52), the annular edge (23) comprises a boosting part (231) and a limiting part (232), the clamping block (51) is movably arranged in the mounting opening (42), and when the isolation disc (20) rotates along one direction, the boosting part (231) drives the clamping block (51) to move towards the outer side of the mounting opening (42); when the isolation disc (20) rotates along the other direction, the reset piece (52) drives the clamping block (51) to move towards the annular groove (41) on the inner side and complete reset, and the limiting part (232) is used for limiting the isolation disc (20) to continue to rotate along the direction when the clamping block (51) is reset;
the clamping block (51) comprises a friction part (511), a reset part (512), an inclined part (513) and a vertical part (514), and when the isolating disc (20) is rotated clockwise to enable the inclined part (513) to act on the boosting part (231), the friction part (511) moves to the outer side of the mounting opening (42); when the isolation disc (20) rotates anticlockwise, the reset piece (52) acts on the reset part (512) to drive the friction part (511) to move into the mounting opening (42) until the limit part (232) contacts with the vertical part (514) to finish resetting of the friction part (511).
2. The porous water bath concentrator according to claim 1, characterized in that a detachable connector (30) is arranged at the opening of the water bath tube (70), and the connector (30) is used for connecting an external negative pressure device.
3. The porous water bath concentrator as claimed in claim 2, wherein the connector (30) comprises a clamping end (31) and a connecting end (32), the clamping end (31) is detachably connected with the water bath tube (70), the clamping end (31) is provided with a connecting through hole (33), the connecting end (32) is tubular and fixedly arranged at the connecting through hole (33) on the clamping end (31), and the connecting end (32) is used for connecting an external negative pressure device.
4. A porous water bath concentrator according to claim 3, wherein the clamping end (31) comprises a clamping sleeve (311) and an adjusting ring (312), the clamping sleeve (311) is used for being sleeved on a pipe orifice of the water bath pipe (70), the adjusting ring (312) is used for adjusting the caliber of the clamping sleeve (311) so as to clamp the water bath pipe (70), the connecting through hole (33) is formed in the clamping sleeve (311), and the connecting end (32) is fixedly arranged at the connecting through hole (33) in the clamping sleeve (311).
5. The apparatus according to claim 4, wherein the grip sleeve (311) comprises a top cover (3111), a surrounding wall (3112) and a plurality of clips (3113), the top cover (3111) is disposed on the surrounding wall (3112), the clips (3113) are uniformly disposed on a lower edge of the surrounding wall (3112), the clips (3113) are in a fan shape with equal curvature to the surrounding wall (3112), and an upper end of the clips (3113) is equal in thickness to a lower edge of the surrounding wall (3112), a thickness of a lower end of the clips (3113) is greater than a thickness of an upper end, an aperture of the adjusting ring (312) is equal to an outer diameter of the surrounding wall (3112), and when the grip sleeve (311) is moved from the upper end to the lower end of the clips (3113), the clips (3113) are gradually contracted inward to grip the water bath tube (70); the connecting through hole (33) is arranged on the top cover (3111), and the connecting end (32) is fixedly arranged at the connecting through hole (33) on the top cover (3111).
6. The apparatus according to claim 4 or 5, characterized in that two protrusions (3122) for rotation are extended on the outer side wall of the adjusting ring (312).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111422665.8A CN114279805B (en) | 2021-11-26 | 2021-11-26 | Porous water bath concentrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111422665.8A CN114279805B (en) | 2021-11-26 | 2021-11-26 | Porous water bath concentrator |
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| Publication Number | Publication Date |
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| CN114279805A CN114279805A (en) | 2022-04-05 |
| CN114279805B true CN114279805B (en) | 2023-06-23 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207379803U (en) * | 2017-11-17 | 2018-05-18 | 山东理工昊明新能源有限公司 | Water-bath nitrogen evaporator |
| CN207923581U (en) * | 2018-02-12 | 2018-09-28 | 天津市恒奥科技发展有限公司 | A kind of vacuum concentration sample bottle quick-change mechanism |
| CN210756467U (en) * | 2019-07-11 | 2020-06-16 | 湖北蓬鑫机械有限公司 | Frock clamp is used in automobile parts processing |
| CN211877580U (en) * | 2020-01-19 | 2020-11-06 | 贵州省农产品质量安全监督检验测试中心 | Multifunctional integrated water bath solvent concentrator |
| CN212757303U (en) * | 2020-05-26 | 2021-03-23 | 安徽恒达药业有限公司 | Water bath heating concentration crystallization device for preparing menthol |
| CN212819999U (en) * | 2020-08-04 | 2021-03-30 | 睿科集团(厦门)股份有限公司 | Automatic concentration instrument |
| CN112382864A (en) * | 2020-09-18 | 2021-02-19 | 芜湖腾飞信息科技有限公司 | Flame-retardant power cable |
| CN112834318B (en) * | 2021-03-04 | 2021-10-26 | 长沙永乐康仪器设备有限公司 | Exhaust method and device for concentrator |
| CN113237728B (en) * | 2021-04-14 | 2023-05-23 | 北京莱伯泰科仪器股份有限公司 | Independent sealing and integral sealing two-in-one device for vacuum multi-position concentration |
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2021
- 2021-11-26 CN CN202111422665.8A patent/CN114279805B/en active Active
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