CN112473760A - Air pressure type liquid level detection method and device by blowing and sucking method - Google Patents
Air pressure type liquid level detection method and device by blowing and sucking method Download PDFInfo
- Publication number
- CN112473760A CN112473760A CN202011273031.6A CN202011273031A CN112473760A CN 112473760 A CN112473760 A CN 112473760A CN 202011273031 A CN202011273031 A CN 202011273031A CN 112473760 A CN112473760 A CN 112473760A
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- air pressure
- liquid level
- lead screw
- piston cylinder
- push rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0213—Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
- G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
- G01F23/161—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid for discrete levels
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A method for detecting air pressure type liquid level by a blowing and sucking method relates to the technical field of liquid transfer workstations, and comprises a shell and a positive and negative rotation motor, wherein a lead screw is vertically arranged on one side of the upper part in the shell and is connected with an output shaft of the positive and negative rotation motor; the liquid level detection method comprises the following specific contents: when the liquid transfer pump moves downwards, the positive and negative rotating motors are started simultaneously and drive the push rod piston to move up and down in the piston cylinder at the amplitude of 0.3mm and the frequency of 10-30Hz, the air pressure sensor monitors the air pressure in the piston cylinder in real time, and when the air pressure monitored by the air pressure sensor has a variation difference of 0.7kPa-2.1kPa, the suction head can be judged to be in contact with the liquid level. The application provides a pressure type liquid level detection method by a blowing and sucking method, which can judge the contact liquid level of a suction head more accurately.
Description
Technical Field
The invention relates to the technical field of liquid transfer workstations, in particular to a method and a device for detecting a liquid level by using a pneumatic pressure type blowing and sucking method.
Background
With the rapid development of science and technology, the pipetting work of laboratories such as biology, chemistry, environment, medicine research and development, food and the like, and units such as hospitals, blood stations and the like is no longer simple small-scale experiment for operating a plurality of samples, but rather, in the face of more complicated research objects and increasing sample numbers, multi-path and diversified large-scale experiments are carried out by using various experimental techniques, so that automatic pipetting systems (or pipetting stations) in the market become increasingly popular, wherein a Z-axis mechanical arm and a pipetting pump are two basic components, and FIGS. 1 and 2 are respectively schematic diagrams of a Z-axis mechanical arm and a pipetting pump, wherein a 1 '-Z-axis mechanical arm, a 2' -Z-axis motor, a 3 '-mounting plate, a 4' -pipetting pump, a 5 '-driving motor, a 6' -push rod piston, a 7 '-piston cylinder, and an 8' -pipette head are fixed on the mounting plate, the Z-axis motor can push the mounting plate and the pipetting pump on the mounting plate to move up and down through the transmission mechanism in the Z-axis mechanical arm, and the driving motor can push the push rod piston to move up and down in the piston cylinder through the transmission mechanism in the pipetting pump so as to complete pipetting (namely liquid pumping and liquid discharging).
It is known that, in the process of pipetting by a pipetting pump, it is necessary to first determine that a tip is in contact with a liquid surface and then perform pipetting, and conventionally, it is generally determined whether the tip is in contact with the liquid surface by using a height sensor or the like.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides a method and a device for detecting the air pressure type liquid level by a blowing and sucking method, which can judge the contact liquid level of a suction head more accurately.
In order to achieve the technical effects, the specific technical scheme of the invention is as follows:
a method for detecting a liquid level by a pneumatic liquid level method through a blowing and sucking method comprises a liquid transfer pump, wherein the liquid transfer pump comprises a shell and a forward and reverse rotating motor, the forward and reverse rotating motor is arranged above the shell, a rotatable screw rod is vertically arranged on one side of the upper part in the shell and is connected with an output shaft of the forward and reverse rotating motor, a screw rod sliding block is sleeved on the screw rod in a matching manner, one side of the screw rod sliding block is connected with a vertical push rod piston, the push rod piston is plugged into a piston cylinder positioned below the push rod piston and is sealed, a suction head is connected below the piston cylinder, a pneumatic sensor is arranged on the lower part in the shell and is communicated; the liquid level detection method comprises the following specific contents: when the liquid transfer pump moves downwards, the liquid transfer pump moves downwards through the existing Z-axis mechanical arm, the descending speed of the liquid transfer pump is not limited, the standards in the industry are adopted, the forward and reverse rotating motors are started simultaneously and drive the push rod piston to move up and down in the piston cylinder at the amplitude of 0.3mm and the frequency of 10-30Hz, the air pressure sensor monitors the air pressure in the piston cylinder in real time, and when the air pressure monitored by the air pressure sensor has a variation difference of 0.7kPa-2.1kPa, the suction head can be judged to be in contact with the liquid level. When the suction head is not contacted with the liquid surface, the air pressure in the piston cylinder is stable, so the air pressure value monitored by the air pressure sensor has no change, when the suction head is contacted with the liquid surface, because the head of the suction head is sealed by the liquid, because the push rod piston moves up and down in the piston cylinder rapidly at the amplitude of 0.3mm and the frequency of 10-30Hz, the air pressure in the piston cylinder has great change, generally between 0.7kPa and 2.1kPa, and the contact of the suction head with the liquid surface can be accurately judged through the air pressure difference.
Furthermore, the air pressure sensor is connected with a digital display air pressure device. The digital display air pressure device is a device in the prior art, such as a digital display air pressure meter.
The utility model provides a pressure-vaccum method vapour-pressure type liquid level detection device, includes the liquid transfer pump, the liquid transfer pump includes casing, positive reverse motor is installed in the casing top, the vertical lead screw that can rotate of installing in upper portion one side in the casing, this lead screw with the output shaft of positive reverse motor, a lead screw sliding block is established to the matching cover on the lead screw, one side of lead screw sliding block is connected with vertical push rod piston, push rod piston fills in the piston cylinder that is located its below and seals, the piston cylinder below is connected with the suction head, baroceptor is installed to the lower part in the casing, baroceptor pass through an air flue with the piston cylinder intercommunication.
Furthermore, the air pressure sensor is connected with a digital display air pressure device. Wherein the digital display air pressure device is a prior art device, such as a digital display air pressure meter
According to the technical scheme, the liquid level detection method realizes judgment of whether the suction head contacts the liquid level or not by the designed air pressure sensor and by controlling the moving amplitude and frequency of the piston push rod and monitoring the change of air pressure, and can judge the contact of the suction head with the liquid level more accurately.
Drawings
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.
FIG. 1 is a schematic view of a prior art Z-axis robotic arm;
FIG. 2 is a schematic view of a prior art pipetting pump;
FIG. 3 is a schematic view of a pipetting pump according to the invention;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is a sectional view taken along line B-B in FIG. 4;
wherein, 1', a Z-axis mechanical arm; 2', a Z-axis motor; 3', mounting plate; 4', a liquid transferring pump; 5', a driving motor; 6', a push rod piston; 7', a piston cylinder; 8', a suction head; 1. a liquid transferring pump; 2. a housing; 3. a positive and negative rotation motor; 4. a screw rod; 5. a screw rod sliding block; 6. a push rod piston; 7. a piston cylinder; 8. a suction head; 9. an air pressure sensor; 10. an airway.
Detailed Description
In order to make the objects, technical solutions and advantages of the present embodiments more clear, the technical solutions in the present embodiments will be described clearly and completely below with reference to the accompanying drawings in the present embodiments, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present application.
In the description of the present invention, it is to be understood that the terms "upper end", "lower end", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred apparatus or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
As shown in fig. 3 to 5, a method for detecting a liquid level by a pressure-vapor suction method includes a liquid displacement pump 1, where the liquid displacement pump 1 includes a housing 2 and a forward and reverse rotation motor 3, the forward and reverse rotation motor 3 is installed above the housing 2, a rotatable lead screw 4 is vertically installed on one side of an upper portion in the housing 2, the lead screw 4 is connected to an output shaft of the forward and reverse rotation motor 3, a lead screw sliding block 5 is sleeved on the lead screw 4 in a matching manner, a vertical push rod piston 6 is connected to one side of the lead screw sliding block 5, the push rod piston 6 is plugged into a piston cylinder 7 located below the push rod piston and sealed, a suction head 8 is connected below the piston cylinder 7, an air pressure sensor 9 is installed on a lower portion in the housing 2, and the air pressure sensor 9 is communicated; the liquid level detection method comprises the following specific contents: when the liquid transfer pump 1 moves downwards, the liquid transfer pump moves downwards through the existing Z-axis mechanical arm, the descending speed of the liquid transfer pump is not limited, the standards in the industry are adopted, the forward and reverse rotating motor 3 is started simultaneously and drives the push rod piston 6 to move up and down in the piston cylinder 7 at the amplitude of 0.3mm and the frequency of 10-30Hz, the air pressure sensor 9 monitors the air pressure in the piston cylinder 7 in real time, and when the air pressure monitored by the air pressure sensor has the variation difference of 0.7kPa-2.1kPa, the fact that the suction head 8 is in contact with the liquid level can be judged. When the suction head is not contacted with the liquid surface, the air pressure in the piston cylinder is stable, so the air pressure value monitored by the air pressure sensor has no change, when the suction head is contacted with the liquid surface, because the head of the suction head is sealed by the liquid, because the push rod piston moves up and down in the piston cylinder rapidly at the amplitude of 0.3mm and the frequency of 10-30Hz, the air pressure in the piston cylinder has great change, generally between 0.7kPa and 2.1kPa, and the contact of the suction head with the liquid surface can be accurately judged through the air pressure difference. Compared with the existing detection method with the accuracy rate of 80-85%, the detection method has the advantages that the accuracy times can reach 90-95 times by taking 100 times of tests as the standard, and the accuracy rate is greatly improved.
Wherein, the air pressure sensor is connected with a digital display air pressure device. The digital display air pressure device is a device in the prior art, such as a digital display air pressure meter.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (4)
1. A method for detecting a liquid level by a pneumatic liquid level method of a blowing and sucking method is characterized by comprising a liquid transferring pump, wherein the liquid transferring pump comprises a shell and a forward and reverse rotating motor, the forward and reverse rotating motor is arranged above the shell, one side of the upper part in the shell is vertically provided with a rotatable lead screw, the lead screw is connected with an output shaft of the forward and reverse rotating motor, a lead screw sliding block is sleeved on the lead screw in a matching manner, one side of the lead screw sliding block is connected with a vertical push rod piston, the push rod piston is plugged into a piston cylinder positioned below the push rod piston and sealed, a suction head is connected below the piston cylinder, the lower part in the shell is provided with a pneumatic sensor, and; the liquid level detection method comprises the following specific contents: when the liquid transfer pump moves downwards, the forward and reverse rotating motors are started simultaneously and drive the push rod piston to move up and down in the piston cylinder at the amplitude of 0.3mm and the frequency of 10-30Hz, the air pressure sensor monitors the air pressure in the piston cylinder in real time, and when the air pressure monitored by the air pressure sensor has a variation difference of 0.7-2.1 kPa, the suction head can be judged to be in contact with the liquid level.
2. The air pressure type liquid level detection method of the blowing and sucking method according to claim 1, wherein the air pressure sensor is connected with a digital display air pressure device.
3. The utility model provides a pressure-vaccum method vapour-pressure type liquid level detection device, a serial communication port, including moving the liquid pump, move the liquid pump and include casing, positive reverse motor is installed in the casing top, the vertical lead screw that can rotate of installing in upper portion one side in the casing, this lead screw with the output shaft of positive reverse motor, a lead screw sliding block is established to the matching cover on the lead screw, one side of lead screw sliding block is connected with vertical push rod piston, the push rod piston is filled in the piston cylinder that is located its below and is sealed, the piston cylinder below is connected with the suction head, baroceptor is installed to the lower part in the casing, baroceptor through an air flue with the piston cylinder.
4. The air pressure type liquid level detection device adopting the blowing and sucking method as claimed in claim 3, wherein the air pressure sensor is connected with a digital display air pressure device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273031.6A CN112473760A (en) | 2020-11-14 | 2020-11-14 | Air pressure type liquid level detection method and device by blowing and sucking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273031.6A CN112473760A (en) | 2020-11-14 | 2020-11-14 | Air pressure type liquid level detection method and device by blowing and sucking method |
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| Publication Number | Publication Date |
|---|---|
| CN112473760A true CN112473760A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011273031.6A Pending CN112473760A (en) | 2020-11-14 | 2020-11-14 | Air pressure type liquid level detection method and device by blowing and sucking method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115215077A (en) * | 2022-07-22 | 2022-10-21 | 上海鼎珂科技有限公司 | Vertical moving device |
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| CN106423324A (en) * | 2016-09-28 | 2017-02-22 | 长春迪瑞医疗科技股份有限公司 | Fluid transfer device and fluid transfer method |
| CN109718883A (en) * | 2018-12-25 | 2019-05-07 | 迪瑞医疗科技股份有限公司 | A kind of liquid-transfering device and liquid relief method |
| CN111589481A (en) * | 2020-06-04 | 2020-08-28 | 向军 | Clinical laboratory uses pipettor |
| CN211403198U (en) * | 2020-04-10 | 2020-09-01 | 佛山市顺励成生物科技有限公司 | Control system of multichannel liquid-transfering device |
| CN211477294U (en) * | 2020-04-10 | 2020-09-11 | 佛山市顺励成生物科技有限公司 | Liquid level detection module and multichannel liquid-transfering device |
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2020
- 2020-11-14 CN CN202011273031.6A patent/CN112473760A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106423324A (en) * | 2016-09-28 | 2017-02-22 | 长春迪瑞医疗科技股份有限公司 | Fluid transfer device and fluid transfer method |
| CN109718883A (en) * | 2018-12-25 | 2019-05-07 | 迪瑞医疗科技股份有限公司 | A kind of liquid-transfering device and liquid relief method |
| CN211403198U (en) * | 2020-04-10 | 2020-09-01 | 佛山市顺励成生物科技有限公司 | Control system of multichannel liquid-transfering device |
| CN211477294U (en) * | 2020-04-10 | 2020-09-11 | 佛山市顺励成生物科技有限公司 | Liquid level detection module and multichannel liquid-transfering device |
| CN111589481A (en) * | 2020-06-04 | 2020-08-28 | 向军 | Clinical laboratory uses pipettor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115215077A (en) * | 2022-07-22 | 2022-10-21 | 上海鼎珂科技有限公司 | Vertical moving device |
| CN115215077B (en) * | 2022-07-22 | 2023-12-22 | 上海鼎珂科技有限公司 | Vertical moving device |
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Application publication date: 20210312 |