CN206192703U - Liquid level protection monitoring sampling device - Google Patents
Liquid level protection monitoring sampling device Download PDFInfo
- Publication number
- CN206192703U CN206192703U CN201621196203.3U CN201621196203U CN206192703U CN 206192703 U CN206192703 U CN 206192703U CN 201621196203 U CN201621196203 U CN 201621196203U CN 206192703 U CN206192703 U CN 206192703U
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- CN
- China
- Prior art keywords
- resistance
- liquid level
- comparator
- electrically connected
- sampling
- Prior art date
- 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.)
- Expired - Fee Related
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 60
- 239000007788 liquid Substances 0.000 title claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 230000001737 promoting Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 5
- 230000000875 corresponding Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000001429 stepping Effects 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The utility model discloses a liquid level protection monitoring sampling device, including sampling probe, liquid level detection circuit, syringe pump subassembly, motion control subassembly and central control module, be provided with capacitive sensor in the sampling probe, this capacitive sensor and liquid level detection circuit electric connection, this liquid level detection circuit and central control module electric connection, this capacitive sensor are used for detecting the capacitance variation in the sampling probe, the syringe pump subassembly includes a step motor and syringe, a step motor and central control module electric connection, syringe and sampling probe intercommunication, the sampling probe sets up on the syringe pump subassembly, a step motor is used for promoting the motion of syringe, the utility model discloses a to the liquid level detection sensor of sampling probe among the current full -automatic sampling system detect inaccurate, the precision is poor, receive the problem of environmental impact easily, design the just stable high liquid level protection monitoring sampling device of a simple structure.
Description
Technical field
The utility model belongs to technical field of medical instruments, more particularly to a kind of liquid level monitoring sampler.
Background technology
Sample adding device is single track micropipettor biological, that chemical laboratory is conventional low capacity moves body, its operation principle
It is that piston moves to realize imbibition and tapping along piston cylinder.Liquid is sucked using atmospheric pressure, then promotes liquid to realize by piston
Tapping.Existing sample adding device is divided into manual sample injector and autopipette.
Because the environment that sample injector is used there may be with communicable virus or other harmful materials, this
When sample-adding process autopipette is needed to complete.But there is problems with, such as sample needle function list in current autopipette
One, external syringe pump, transfer conduit is long, and detecting liquid level is easy to failure etc..
And it is typically all at present, to use pressure sensor in detection of the full-automatic sampling system to liquid level, and easily
Receiving the influence of external pressure causes erroneous judgement, have impact on the precision of equipment sampling.
Utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of liquid level monitoring arrangement, its energy
Solve the technical problem of level detection.
The purpose of this utility model is realized using following technical scheme：
A kind of liquid level monitoring sampler, including sampling probe, liquid level detection circuit, injection pump group part, motion control component
And central control module；Capacitance sensor is provided with the sampling probe, the capacitance sensor electrically connects with liquid level detection circuit
Connect, the liquid level detection circuit is electrically connected with central control module, the capacitance sensor is used to detect that the electric capacity in sampling probe to become
Change；
The injection pump group part includes the first stepper motor and syringe, first stepper motor and central control module
It is electrically connected with, the syringe is connected with sampling probe, the sampling probe is arranged in injection pump group part, first stepper motor
For the motion of pushing syringe；
The motion control component includes the second stepper motor, line slideway, screw mandrel and sampling arm, the second stepping electricity
Machine is electrically connected with central control module；The injection pump group part is installed on line slideway by sampling arm, the sampling arm
It is connected with wire rod thread, second stepper motor is used to drive sampling arm to be moved on line slideway by screw mandrel.
Preferably, the liquid level detection circuit includes that RC sample circuits, reference voltage module, first comparator, pulse take
Sample circuit；The capacitance sensor is electrically connected by RC sample circuits with the inverting input of first comparator, the benchmark electricity
Die block is electrically connected with the normal phase input end of first comparator, and output end and the pulse sampling circuit of the first comparator are electrically connected
Connect, and the pulse sampling circuit is electrically connected with central control module.Its circuit knot that can further solve liquid level detection circuit
Structure.
Preferably, the model LM393A of the first comparator.Its model for further disclosing first comparator.
Preferably, including electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Resistance R6 and the second comparator；
Capacitance sensor is electrically connected with one end of electric capacity C1, one end of resistance R3, one end of electric capacity C2 and the second comparator
Inverting input electrical connection, the other end of resistance R3 electrically connects with one end of resistance R2；The other end of electric capacity C2 passes through electric capacity
C3 is grounded；One end of resistance R1 connects with power supply, the positive input of one end, one end of resistance R6 and the second comparator of resistance R5
The other end with resistance R1 is held to electrically connect；The other end ground connection of resistance R5, the other end of resistance R6, the output of the second comparator
End, the other end of the one end of resistance R4 with resistance R2 are electrically connected, and the output end of second comparator controls mould with center
Block is electrically connected, and the other end of resistance R4 is electrically connected with the feeder ear of the second comparator.It can further solve liquid level detection circuit
Particular circuit configurations.
Preferably, the model LM393A of second comparator.Its particular type that can further solve the second comparator
Number.
Compared to existing technology, the beneficial effects of the utility model are：
The purpose of this utility model is directed to the level detection sensors device inspection of sampling probe in existing full-automatic sampling system
Indeterminacy, low precision, the problem for being easily subject to ambient influnence, design a kind of simple structure and stability liquid level monitoring sampling high
Device.
Brief description of the drawings
Fig. 1 is a kind of structure chart of liquid level monitoring sampler of the utility model；
Fig. 2 is the circuit structure diagram of the utility model liquid level detection circuit.
Reference：1st, sampling probe；2nd, syringe；3rd, the first stepper motor；4th, sampling arm；5th, screw mandrel；6th, line slideway；
7th, the second stepper motor.
Specific embodiment
Below, with reference to accompanying drawing and specific embodiment, the utility model is described further：
As shown in figure 1, a kind of liquid level monitoring sampler is present embodiments provided, including sampling probe 1, level detection electricity
Road, injection pump group part, motion control component and central control module；Capacitance sensor is provided with the sampling probe 1, the electric capacity
Sensor is electrically connected with liquid level detection circuit, and the liquid level detection circuit is electrically connected with central control module, the capacitance sensing
Device is used to detect the capacitance variations in sampling probe；
The injection pump group part includes the first stepper motor 3 and syringe 2, and first stepper motor 3 is controlled with center
Module is electrically connected with, and the syringe 2 is connected with sampling probe 1, and the sampling probe 1 is arranged in injection pump group part, and described first
Stepper motor 3 is used for the motion of pushing syringe 2；The motion control component includes the second stepper motor 7, line slideway 6, silk
Bar 5 and sampling arm 4, second stepper motor 7 are electrically connected with central control module；The injection pump group part passes through sampling arm
4 are installed on line slideway 6, and the sampling arm 4 is installed on screw mandrel 5 by screw thread, and second stepper motor 7 is used to pass through
Screw mandrel 5 is moved on line slideway 6 driving sampling arm 4.Wherein sample needle 1 is joined directly together with syringe 2 and connects, the first stepping electricity
Machine 3 is loaded by syringe 2, and sampling arm 4 is fixed on line slideway 6, and the second stepper motor 7 controls sampling arm along straight line
The direction of guide rail 6 moves up and down and is sampled, and sample needle 1 runs into after non-ionic solvents that electric capacity becomes on sample needle 1 during sampling
Change, different waveforms are produced by liquid level detection circuit, then analyse whether to touch liquid.
The liquid level detection circuit specifically includes electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, resistance
R4, resistance R5, resistance R6 and comparator；The resistance R2 is variable resistor, and electric capacity can occur after sampling probe touches liquid level
Change, the triangle that RC sample circuits are produced diminishes period of wave, that is, frequency becomes big, and the pulse carries out voltage by comparator again
Compare, the positive input input of comparator is reference voltage, and the size of voltage is determined by the ratio of resistance R1 and resistance R2,
When the voltage of input comparator is more than reference voltage, comparator output high level；When the voltage of input comparator is less than
During this voltage, the low level of comparator output, through over-voltage comparator output is square wave, eventually passes pulse sampling circuit and enters
Horizontal pulse frequency judges whether to have touched liquid, the first step motor control syringe when judging to touch liquid
It is sampled, and the sensitivity of the level detection of this sample needle 1 depends on pulse frequency.
The capacitance sensor of sample needle in fig. 2 is at IN1, and the capacitance sensor is electrically connected with one end of electric capacity C1
Connect, the inverting input electrical connection of one end, one end of electric capacity C2 and comparator of resistance R3, the other end and the resistance R2 of resistance R3
One end electrical connection；The other end of electric capacity C2 is grounded by electric capacity C3；One end of resistance R1 connects with power supply, and the one of resistance R5
The other end of the positive input of end, one end of resistance R6 and comparator with resistance R1 is electrically connected；Another termination of resistance R5
Ground, the other end of the other end of resistance R6, the output end of comparator, one end of resistance R4 with resistance R2 is electrically connected, and described
The output end of comparator is electrically connected with central control module, and the other end of resistance R4 is electrically connected with the feeder ear of comparator.It is described
The model LM393A of comparator.
The operation principle of the present embodiment：
When the sampler is started working, the second stepper motor 7 controls the edge of sampling arm 4 by controlling screw mandrel 5
Line slideway 6 moves to be sampled operation；When sampling probe 1 touches liquid level, capacitance sensor detects electric capacity
Change, then transmitted to central control module the signal by liquid level detection circuit, and central control module controls the first step
Stepper motor 3 is operated, and the first stepper motor 3 drives syringe 2 to extract sample to complete corresponding sampling operation.
It will be apparent to those skilled in the art that technical scheme that can be as described above and design, make other various
It is corresponding to change and deformation, and all these change and deformation should all belong to the protection of the utility model claim
Within the scope of.
Claims (5)
1. a kind of liquid level monitoring sampler, it is characterised in that including sampling probe, liquid level detection circuit, injection pump group part, motion
Control assembly and central control module；Capacitance sensor is provided with the sampling probe, the capacitance sensor is electric with level detection
Road is electrically connected with, and the liquid level detection circuit is electrically connected with central control module, and the capacitance sensor is used to detect in sampling probe
Capacitance variations；
The injection pump group part includes the first stepper motor and syringe, and first stepper motor is electrical with central control module
Connection, the sampling probe is arranged in injection pump group part, and the syringe is connected with sampling probe, and first stepper motor is used
In the motion of pushing syringe；
The motion control component include the second stepper motor, line slideway, screw mandrel and sampling arm, second stepper motor with
Central control module is electrically connected with；The injection pump group part is installed on line slideway by sampling arm, the sampling arm and silk
Bar is threadedly coupled, and second stepper motor is used to drive sampling arm to be moved on line slideway by screw mandrel.
2. liquid level monitoring sampler as claimed in claim 1, it is characterised in that the liquid level detection circuit includes RC samplings
Circuit, reference voltage module, first comparator, pulse sampling circuit；The capacitance sensor passes through RC sample circuits and first
The inverting input electrical connection of comparator, the reference voltage module is electrically connected with the normal phase input end of first comparator, described
The output end of first comparator is electrically connected with pulse sampling circuit, and the pulse sampling circuit electrically connects with central control module
Connect.
3. liquid level monitoring sampler as claimed in claim 2, it is characterised in that the model of the first comparator
LM393A。
4. liquid level monitoring sampler as claimed in claim 1, it is characterised in that the liquid level detection circuit include electric capacity C1,
Electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and the second comparator；
Capacitance sensor is electrically connected with one end of electric capacity C1, one end of resistance R3, one end of electric capacity C2 and the second comparator it is anti-
Phase input is electrically connected, and the other end of resistance R3 is electrically connected with one end of resistance R2；The other end of electric capacity C2 is connect by electric capacity C3
Ground；One end of resistance R1 connects with power supply, and the normal phase input end of one end, one end of resistance R6 and the second comparator of resistance R5 is equal
The other end with resistance R1 is electrically connected；Resistance R5 the other end ground connection, the other end of resistance R6, the output end of the second comparator,
The other end of the one end of resistance R4 with resistance R2 is electrically connected, and the output end of second comparator is electric with central control module
Connection, the other end of resistance R4 is electrically connected with the feeder ear of the second comparator.
5. liquid level monitoring sampler as claimed in claim 4, it is characterised in that the model of second comparator
LM393A。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196203.3U CN206192703U (en) | 2016-10-28 | 2016-10-28 | Liquid level protection monitoring sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196203.3U CN206192703U (en) | 2016-10-28 | 2016-10-28 | Liquid level protection monitoring sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206192703U true CN206192703U (en) | 2017-05-24 |
Family
ID=58734286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621196203.3U Expired - Fee Related CN206192703U (en) | 2016-10-28 | 2016-10-28 | Liquid level protection monitoring sampling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206192703U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146415A (en) * | 2019-05-10 | 2019-08-20 | 深圳市万臣科技有限公司 | The detection method and device of liquid level contact |
| CN111380916A (en) * | 2018-12-29 | 2020-07-07 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN113285637A (en) * | 2021-06-01 | 2021-08-20 | 南京工业大学 | High-precision micropipette feedback control system |
-
2016
- 2016-10-28 CN CN201621196203.3U patent/CN206192703U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380916A (en) * | 2018-12-29 | 2020-07-07 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN110146415A (en) * | 2019-05-10 | 2019-08-20 | 深圳市万臣科技有限公司 | The detection method and device of liquid level contact |
| CN110146415B (en) * | 2019-05-10 | 2022-03-29 | 深圳市万臣科技有限公司 | Method and device for detecting liquid surface contact |
| CN113285637A (en) * | 2021-06-01 | 2021-08-20 | 南京工业大学 | High-precision micropipette feedback control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170524 Termination date: 20211028 |