CN201014986Y - Potentiometric titration reversal valve and burette controlling device - Google Patents
Potentiometric titration reversal valve and burette controlling device Download PDFInfo
- Publication number
- CN201014986Y CN201014986Y CNU2007200339054U CN200720033905U CN201014986Y CN 201014986 Y CN201014986 Y CN 201014986Y CN U2007200339054 U CNU2007200339054 U CN U2007200339054U CN 200720033905 U CN200720033905 U CN 200720033905U CN 201014986 Y CN201014986 Y CN 201014986Y
- Authority
- CN
- China
- Prior art keywords
- buret
- screw mandrel
- titration
- reversal valve
- potentiometric titration
- 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
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Abstract
The utility model relates to a control device for a potentiometric titration change valve and buret. The model has two stepper motors. Under the help of a reducing mechanism, one of the stepper motors makes a screw mandrel move with a straight line, while the other motor makes a vertical axis swing with a sector line. There is a nut that cooperates with the screw mandrel, and the nut is carried by a surface bearing. A chopper is positioned on the upper end of the screw mandrel, while a sector chopper is positioned on the upper end of the vertical axis. And a photoelectric switch is arranged on the final position of the chopper and the sector chopper. The device is provided with a computer control system, which includes a change delay circuit. The utility model applies to controling the movement of the buret piston and the change valve core of the potentiometric titration. The utility model is capable of improving the titration precision, making vacancy compensation when the screw mandrel changes direction, boosting the titration veracity and providing a long service life. Meanwhile, the electric engine is not impacted by the axial force and can move neatly; while the change valve and the buret can work simultaneously as arranged.
Description
Technical field
The utility model relates to a kind of potentiometric titration reversal valve of electrochemical analysis automatical potentiometric titrimeter and control device of buret of being used for.
Background technology
In the design of electrochemical analysis automatical potentiometric titrimeter, two important critical components are always arranged, i.e. reversal valve and buret.And needing a specific device, reversal valve and buret finish driving and control to it.For reversal valve, be to guarantee to control passing through or ending of volumetric soiutions, reversal valve is to do circumference backswing campaign.Buret then is suction or the release that guarantees the control volumetric soiutions, and the piston head in the buret does reciprocating linear motion.Kinematic relation between them is interrelated cooperation.Control device commonly used at present is to utilize small type stepping motor directly to promote the interior piston of buret, its shortcoming is: the direct drive screw of (1) stepper motor, screw rod promotes piston, between motor shaft and the screw rod without gear change, the flow velocity of titrant directly depends on the slewing rate of stepper motor, the titration low precision, unit titration volume minimum only reaches Δ V=0.1ml.(2) screw rod commutates moment, because the pitch gap, it is motionless that motor is transferred piston, does not carry out the room compensation again, causes titration inaccurate.(3) thrust of buret inner carrier all acts on the rotation axis of stepper motor, and the axial force that stepper motor need be born is bigger, is unfavorable for operate as normal, even can damage.In addition, in this device reversal valve control inaccurate, cooperates difficult synchronously with buret, also influence the titration precision.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, the unlatching of reversal valve in a kind of automatic CONTROLLED POTENTIAL titrator is provided or closes and the suction of buret solution or the control device of release, this device can improve titration precision and accuracy, and motion flexibly, compact conformation, long service life.
The technical solution of the utility model is: the control device of potentiometric titration reversal valve and buret comprises stepper motor, by screw mandrel, the linear reciprocating mechanism that nut constitutes, improvements are that stepper motor has two, wherein the output shaft of a motor is by gear reduction and described screw mandrel, the nut motion is connected, nut support is on surface bearing, the lower end of screw mandrel links to each other with the buret inner carrier, the upper end is provided with crossbeam, cut mating plate on the crossbeam, cut mating plate on, optoelectronic switch is equipped with at place, following final position respectively, another motor-driven Z-axis is done fan-shaped swing, the Z-axis lower end links to each other with change-over valve core, the upper end is provided with the fan-shaped mating plate of cutting, optoelectronic switch is equipped with at fan-shaped place, two final positions of cutting mating plate respectively, be provided with computer program controlled system in this control device, above-mentioned motor, optoelectronic switch is connected with stored program controlled respectively, contains the delay circuit that turns to that is connected with the optoelectronic switch at the place, last final position of screw mandrel in the stored program controlled.
Further scheme is: be provided with gear reduction between stepper motor and the described Z-axis; This device is provided with upper, middle and lower-ranking horizontal fixed head, is connected by fixed leg each other, described two groups of gear reductions are separately positioned on, the middle level fixed head and in, between lower floor's fixed head.
The course of work of this utility model CONTROLLED POTENTIAL titration reversal valve and buret is: after start automatically resets, the spool of potentiometric titration reversal valve is in the imbibition position, at this moment, start the drive motor of buret, by the gear reduction transmission, by rotatablely moving of nut, be transformed into the rectilinear motion up and down of screw mandrel.Piston in the up drive buret of screw mandrel is drawn into titrant in the buret from titration bottle.During cutting mating plate and arrive to go up the optoelectronic switch position of destination county on being fixed on the screw mandrel crossbeam, screw mandrel is with regard to stop motion, and turning under the delay circuit effect immediately in the other direction downwards about lag motion 1～2mm (numerical value is slightly larger than the gap of moving about of screw mandrel), the titrant during lag motion in the buret comes back in the titrant bottle by the titration reversal valve.At this moment, the titration reversal valve is done fan-shaped gyration under motor-driven, and the fan-shaped mating plate of cutting of its axle head rotates thereupon, when arriving the optoelectronic switch position, promptly stops, and the position of titration this moment reversal valve is referred to as the titration position.Constantly to the titration cell titration, titration once detects once buret by pre-set program.When testing circuit detected titration end-point, buret stopped titration.Write down the volume and the concentration of the titrant that spends this moment, can extrapolate the N of titrated solution.
The utility model is owing to be provided with gear reduction, and reduction gear ratio is bigger, and motor rotates a circle, and screw mandrel only rotates a small angle, and the buret inner carrier moves very small distance, thereby can improve the titration precision, and minimum titration volume is Δ V=0.01ml.The commutation time-delay motion behind the terminal point is gone up in screw mandrel arrival, has eliminated the pitch gap of commutation moment, has the room compensate function, makes the control of titer more accurate.Thrust on the screw mandrel is born by surface bearing, and stepper motor is not subjected to axial force, only is subjected to less torque, even screw mandrel thrust is bigger, motor also can free and relaxedly turn round, long service life.In addition, the drive motor of reversal valve and buret, cooperates precisely by setting synchronization action by stored program controlled and the control of corresponding light electric switch in this device; Each parts multilayer is provided with in addition, and compact conformation further improves this device usability.
Description of drawings
Accompanying drawing is the utility model structural representation.
Embodiment
Referring to accompanying drawing, upper, middle and lower-ranking horizontal fixed head 1 is set in this device, be connected by fixed leg 20 each other, stepper motor 2 by be located at, second gear reduction unit structure 19 between the fixed head of middle level drives the nut 10 that is bearing on the surface bearing 18 and rotates, and then promotion screw mandrel 9 rises or descends, the screw mandrel lower end links to each other with the buret inner carrier, the screw mandrel upper end is provided with the crossbeam 7 that slides along guide pillar 8, be equipped with on the crossbeam and cut mating plate 5, be equipped with and cut the corresponding optoelectronic switch 6 in the upper and lower final position of mating plate and 3 on the side plate 4 in the guide pillar outside; Stepper motor 11 drives Z-axis 16 swings by the gear reduction in being located at, between lower floor's fixed head 17, the Z-axis upper end is provided with the fan-shaped mating plate 12 of cutting, its opening degree is 150 °, and optoelectronic switch 14 and 15 are equipped with respectively in place, two final positions, and the Z-axis lower end links to each other with change-over valve core; Be provided with computer program controlled system in this device, above-mentioned motor, optoelectronic switch are connected with computer program controlled system by connector 13, also contain in this stored program controlled one be connected with the optoelectronic switch 6 at the place, last final position of screw mandrel turn to delay circuit.
Claims (3)
1. the control device of potentiometric titration reversal valve and buret, comprise stepper motor, by screw mandrel, the linear reciprocating mechanism that nut constitutes, it is characterized in that stepper motor has two, wherein the output shaft of a motor is by gear reduction and described screw mandrel, the nut motion is connected, nut support is on surface bearing, the lower end of screw mandrel links to each other with the buret inner carrier, the upper end is provided with crossbeam, cut mating plate on the crossbeam, cut mating plate on, optoelectronic switch is equipped with at place, following final position respectively, another motor-driven Z-axis is done fan-shaped swing, the Z-axis lower end links to each other with change-over valve core, the upper end is provided with the fan-shaped mating plate of cutting, optoelectronic switch is equipped with at fan-shaped place, two final positions of cutting mating plate respectively, be provided with computer program controlled system in this control device, above-mentioned motor, optoelectronic switch is connected with stored program controlled respectively, contains the delay circuit that turns to that is connected with the optoelectronic switch at the place, last final position of screw mandrel in the stored program controlled.
2. by the control device of described potentiometric titration reversal valve of claim 1 and buret, it is characterized in that being provided with gear reduction between stepper motor and the described Z-axis.
3. press the control device of described potentiometric titration reversal valve of claim 2 and buret, it is characterized in that this device is provided with upper, middle and lower-ranking horizontal fixed head, connect by fixed leg each other, described two groups of gear reductions are separately positioned on, the middle level fixed head and in, between lower floor's fixed head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200339054U CN201014986Y (en) | 2007-01-29 | 2007-01-29 | Potentiometric titration reversal valve and burette controlling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200339054U CN201014986Y (en) | 2007-01-29 | 2007-01-29 | Potentiometric titration reversal valve and burette controlling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201014986Y true CN201014986Y (en) | 2008-01-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200339054U Expired - Fee Related CN201014986Y (en) | 2007-01-29 | 2007-01-29 | Potentiometric titration reversal valve and burette controlling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201014986Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102887630A (en) * | 2012-10-26 | 2013-01-23 | 扬州大学 | Vacuum glass edge sealing welding flux spreading device |
| CN103105316A (en) * | 2012-11-06 | 2013-05-15 | 苏州聚阳环保科技有限公司 | Injection pump |
-
2007
- 2007-01-29 CN CNU2007200339054U patent/CN201014986Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102887630A (en) * | 2012-10-26 | 2013-01-23 | 扬州大学 | Vacuum glass edge sealing welding flux spreading device |
| CN103105316A (en) * | 2012-11-06 | 2013-05-15 | 苏州聚阳环保科技有限公司 | Injection pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080130 Termination date: 20140129 |