One kind is anti-to bottom out sampling apparatusTechnical field
The invention belongs to detect sampling technique field, more particularly, to a kind of safety quantitative automatic sampling device.
Background technique
Automatic sampling, i.e., carry out representative sample in the case where unattended, obtains accurately and reliably reaction information.FromDynamic sampling application is more and more extensive, has many advantages: the system reacted such as some, artificial to stop will affect reactingJourney, automatic sampling will not influence reaction system；Automatic sampling, the sample taken are representative and repeated；Automatic sampling canWith unattended automation sampling in 24 hours；And sample automation is prepared, save manpower.
Although automatic sampling has various advantages, there is also what some safety and technical needs overcame to askTopic.Such as: sampling needle is in sampling, if the liquid level position inaccurate of sampling needle, What is more without personnel monitoring, if containedDress sample is the frangible glass article such as test tube, and position inaccurate is easy to be poked by sampling needle, causes danger.
Summary of the invention
In view of this, the present invention is directed to propose a kind of anti-bottom out sampling apparatus, it is accurate to carry out liquid level positioning, and guarantee not touchAnd bottom, improve safety and accuracy.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
One kind is anti-to bottom out sampling apparatus, including sampling needle and sampling needle cannula, and the head connection conduction of the sampling needle is replacedMend head；The sampling needle lower end is detachably connected sampling needle, reducing type is set as above the sampling needle cannula, and sampleBulge loop of the needle cannula major diameter portion setting for limiting vertically；Sample pivot bush unit between needle cannula and buffer ferrule, cushion collarPipe lower end is set as and the matched contraction mouth of bulge loop；Buffer spring is set in buffer ferrule, is arranged on buffer spring top and usesIn the limited cover of buffer spring limit；The minor diameter of the sampling needle prolongs end through buffer spring and limited cover and positioningBaffle is connected；
The buffer ferrule is outer to be connected with lifting support.
Further, the sampling needle is set as smooth bending type, and sampling needle is through in the bending perforation of sampling needle cannula,Lower section passes through collet cover locking；The collet set inner wall is threadedly coupled with sampling needle sleeve outer wall.
Further, vertical connector, diameter under the connector and buffer ferrule is arranged in the end of the positioning baffleThe connecting hole of end is threadedly coupled.
Further, the limited cover includes cover board and connection ring wall, and the connection ring wall is threadedly coupled with buffer ferrule.
Further, the lifting support includes connection ring, connecting rod and connecting plate, and the connection ring is placed on buffer ferruleOutside, the connection ring are connected by connecting rod with connecting plate, are arranged optocoupler on the connecting plate, the optocoupler vertical direction andPositioning baffle alignment.
Further, conductor wire is set outside the sampling needle, and the conductor wire is connected with conduction substitute head.
Further, the conductive substitute head material is conductive graphite.
Compared with the existing technology, one kind of the present invention prevents that bottoming out sampling apparatus has the advantage that
Sampling needle by sampling needle cannula pivot bush unit in buffer ferrule, by bulge loop and contraction mouth to sampling needle cannulaLower section positioning is carried out, top positioning is carried out to sampling needle cannula by limited cover, and be nested with buffering by the way that minor diameter is arrangedSpring, integrally playing sampling needle cannula and buffer ferrule has opposite activity surplus, and has under the action of buffer springThe effect of buffering, it is whole to realize when the bottom of conductive substitute head contact, it can be buffered in time, and positioning plate contacts optocouplerLater, it is automatically stopped knit stitch, has the function of bottoming out protection, prevents bottom damaged, plays safe sampling.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the inventionIt applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1, which is that one kind described in the embodiment of the present invention is anti-, bottoms out sampling apparatus diagrammatic cross-section.
Description of symbols:
1- sampling needle；2- conduction substitute head；3- samples needle cannula；31- collet set；32- major diameter portion；33- minor diameter；34- bulge loop；35- connecting hole；4- buffer ferrule；41- contraction mouth；5- buffer spring；6- limited cover；7- positioning baffle；71- connectionHead；8- lifting support；81- connection ring；82- connecting rod；83- connecting plate；9- optocoupler.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phaseMutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" isIt is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or darkShow that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pairPresent invention limitation.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply oppositeImportance or the quantity for implicitly indicating indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can be withExplicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phaseEven ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It canTo be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediaryConnection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete conditionConcrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment 1
Such as Fig. 1, one kind is anti-to bottom out sampling apparatus, including sampling needle 1 and sampling needle cannula 3, the head of the sampling needle 1 connectConnect conductive substitute head 2；3 lower end of sampling needle cannula is detachably connected sampling needle 1, is set as above the sampling needle cannula 3Reducing type, and sample bulge loop 34 of 3 major diameter portion 32 of the needle cannula setting for limiting vertically；Sample needle cannula 3 and buffer ferrule 4Between pivot bush unit, 4 lower end of buffer ferrule is set as and the matched contraction mouth 41 of bulge loop 34；Buffering is set in buffer ferrule 4Spring 5, the limited cover 6 that setting is limited for buffer spring 5 on 5 top of buffer spring；The minor diameter 33 of the sampling needle 1Prolong end to be connected through buffer spring 5 and limited cover 6 with positioning baffle 7；
The buffer ferrule 4 is outer to be connected with lifting support 8.
Sampling needle 1 by sampling 3 pivot bush unit of needle cannula in buffer ferrule 4, by bulge loop 34 and contraction mouth 41 to adopting1 casing of sample needle carries out lower section positioning, carries out top positioning by 6 pairs of sampling needle cannulas 3 of limited cover, and pass through setting minor diameterPortion 33 is nested with buffer spring 5, and integrally playing sampling needle cannula 3 and buffer ferrule 4 has opposite activity surplus, and in buffering elasticHave the effect of buffering under the action of spring 5, it is whole to realize when conduction substitute head 2 touches bottom, it can be buffered, be prevented in timeOnly bottom is damaged, plays safe sampling.
The sampling needle 1 is set as smooth bending type, and sampling needle 1 is through in the bending perforation of sampling needle cannula 3, lower sectionPass through 31 locking of collet set；The collet covers 31 inner walls and connect with sampling 3 outer wall thread of needle cannula.It is readily disassembled installation, and energyEnough guarantee that sampling needle 1 samples vertically.
The lifting support 8 includes connection ring 81, connecting rod 82 and connecting plate 83, and the connection ring 81 is placed on cushion collarOutside pipe 4, the connection ring 81 is connected by connecting rod 82 with connecting plate 83, and optocoupler 9, the light are arranged on the connecting plate 839 vertical direction of coupling is aligned with positioning baffle 7.The action principle of optocoupler 9 are as follows: using light as the device of media transmission electric signal, inputElectric signal drive light emitting diode, be allowed to issue the light of certain wavelength, by optical detector receive and generate photoelectric current, usingIt is exported after being further amplified.Complete the conversion of electrical-optical-electrical.
In the present invention, detection and the transmission of signal are carried out using optocoupler 9, after optocoupler 9 is blocked by positioning baffle 7, noOptical signal can be transmitted, the controller for receiving signal then changes output, and actuating mechanism is the lifting running of crane.
The power source of the above optocoupler 9, controller and lifting support 8 is the prior art, the optocoupler 9 of model TP805This function can be achieved, but not limited to this kind model；The lifting of lifting support 8 can use the power cylinder or electricity of the prior artPower telescopic rod is completed.
Embodiment 2
Conductor wire is set outside the sampling needle 1, and the conductor wire is connected with conduction substitute head 2.Conductive substitute 2 material of headMatter is conductive graphite.Such design forms detecting liquid level, when conduction substitute head 2 touches liquid level, conduction substitute head 2, moltenLiquid and conductor wire are formed into a loop, and may determine that the head of conductive substitute head 2 has contacted liquid level with this.
Sampling is anti-to bottom out method: when conductive substitute head 2 touches the test tube bottom for containing sample liquid, buffer spring 5It is squeezed, guarantees that sampling needle 1 and sampling needle cannula 3 no longer move down, conductive substitute head 2 and test tube is protected not to be damagedIt is bad；
At the same time, lifting support 8 continues to decline, and when dropping to certain position, positioning baffle 7 blocks optocoupler 9Signal, separate the transmission of signal, lifting support 8 stops decline, and returns to a distance, so that the top of conductive substitute head 2Slight distance is kept with test tube bottom, completes to prevent bottoming out protection, and invisible spectro liquid can be drawn as far as possible.
The foregoing is merely illustrative of the preferred embodiments of the present invention, be not intended to limit the invention spirit and principle itInterior, any modification, equivalent replacement, improvement and so on should be included within the scope of the invention.