CN203816658U - Quantitative pipettor - Google Patents
Quantitative pipettor Download PDFInfo
- Publication number
- CN203816658U CN203816658U CN201420200926.0U CN201420200926U CN203816658U CN 203816658 U CN203816658 U CN 203816658U CN 201420200926 U CN201420200926 U CN 201420200926U CN 203816658 U CN203816658 U CN 203816658U
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- screw rod
- angular wheel
- wheel
- rotary handle
- fixed
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Abstract
The utility model discloses a quantitative pipettor which can meet a high-precision quantitative liquid taking requirement. The quantitative pipettor comprises a hollow barrel body, wherein two ends of the barrel body are sealed by virtue of cover plates; pipette connectors communicated with the interior of the barrel body are arranged on the cover plates; a piston and a screw rod are arranged in the barrel body; one end of the screw rod is fixedly arranged on the piston, and the other end of the screw rod is extended outside the barrel body along the axial direction of the barrel body; a screw rod travel control device is arranged on the screw rod. The quantitative pipettor is capable of precisely controlling the travel of the screw rod by virtue of the screw rod travel control device; when moving, the screw rod can drive the piston to move; when moving, the piston sucks liquid, and the volume of the sucked liquid is a product obtained by multiplying the screw rod moving distance and the cross sectional area of the piston; the screw rod travel control device is capable of precisely controlling the travel of the screw rod, so that the volume of the liquid sucked by the pipette is precisely controlled, and a requirement on high-precision quantitative liquid taking can be met; the quantitative pipettor is suitable for being popularized and applied in the field of chemical experiment teaching equipment.
Description
Technical field
The utility model relates to chemical experiment teaching apparatus field, especially a kind of quantitative liquid shifter.
Background technology
At present, in chemical experiment teaching process, conventionally be all to adopt following three kinds of modes to realize for quantitative liquid getting, the first is the mode that adopts graduated cylinder, and the liquid that is about to measure is poured in graduated cylinder, then adopts glue head dropper to carry out gradually quantitatively, this mode is in the time measuring liquid, want pouring liquid to use again glue head dropper quantitative, the liquid volume accuracy obtaining after so loaded down with trivial details operation is also lower, inefficiency; The second way is the mode that adopts pipette and ear washing bulb, while utilizing pipette and ear washing bulb to measure liquid, owing to sucking liquid level height in the restive pipette of liquid rear right hand forefinger, the precision of quantitative liquid getting is lower, but also can only measure fixed volume liquid, the third mode is the mode that adopts pipette, while measuring liquid with pipette, ear washing bulb can not accurately be controlled the volume that sucks liquid, is difficult to reach high-precision quantitative requirement.
Utility model content
Technical problem to be solved in the utility model is to provide and a kind ofly can reaches the high-precision fixed quantitative liquid shifter that measures liquid requirement.
The utility model solves the technical scheme that its technical problem adopts: this quantitative liquid shifter, comprise the cylindrical shell of hollow, the two ends up and down of described cylindrical shell are respectively by upper cover plate and lower cover sealing, described upper cover plate is provided with the pipette connector being communicated with inner barrel, in described cylindrical shell, be provided with piston and screw rod, described screw rod one end is fixed on piston, and the other end extends to cylindrical shell outside along the axial direction of cylindrical shell, is provided with screw stroke control device on described screw rod.
Be further, described screw stroke control device comprises the first angular wheel, the second angular wheel and be set in the nut on screw rod, between described nut and lower cover, be provided with position-limiting drum, lower end and the nut of described position-limiting drum are fixed together, described position-limiting drum outer surface of upper is fixed with limited block, also comprise the L-type arc plate being fixed on lower cover, described limited block be stuck in the groove that L-type arc plate surrounds with lower cover and the height of limited block and the height of groove consistent, described the first angular wheel is fixedly connected with nut and the central axis of the first angular wheel and the central axes of nut, orthogonal and the second angular wheel of the central axis of the central axis of described the second angular wheel and the first angular wheel and the first angular wheel are intermeshing, on described the second angular wheel, be connected with rotary handle, on described rotary handle, be arranged with fixed muffle, described fixed muffle is fixedly connected with cylindrical shell by support, on described support, be fixed with angle scale, the central axis of described angle scale and the central axes of rotary handle, on described rotary handle, be fixed with pointer, in the time that rotary handle rotates, pointer is along with the different graduation marks of the rotation orientation angle dish of rotary handle.
Further, the number of teeth of described the first angular wheel is N1, and the number of teeth of the second angular wheel is N2, and the ratio of the number N of teeth 1 of described the first angular wheel and the number N of teeth 2 of the second angular wheel is i=2～5.
Be further, between described the second angular wheel and rotary handle, be provided with deceleration device, described deceleration device comprises the first stud wheel, the second stud wheel, connecting axle, described connecting axle is fixed on support by bearing, the number of teeth of described the first stud wheel is N3, the number of teeth of the second stud wheel is N4, the ratio of the number N of teeth 3 of described the first stud wheel and the number N of teeth 4 of the second stud wheel is j=2～5, described the first stud wheel and the second angular wheel are separately fixed at the two ends of connecting axle, the second stud wheel is fixed on the termination of rotary handle, and described the first stud wheel and the second master gear are intermeshing.
Further, on described rotary handle, be connected with the automaton for driving rotary handle to rotate.
Further, described screw stroke control device comprises the nut being set on screw rod and the automaton rotating for drive nut.
Further, described automaton comprises stepper motor and the single-chip microcomputer for control step electric machine rotation, on described single-chip microcomputer, is connected with digital display tube.
Further, on described stepper motor, be provided with radiator fan.
Further, between described pipette connector and cover plate, be provided with safety gas cylinder, on described safety gas cylinder, be provided with venthole, described venthole seals by vent plug.
Further, on described cylindrical shell, be provided with bracket, on described bracket, be provided with multiple pipette draw-in grooves.
The beneficial effects of the utility model are: this quantitative liquid shifter utilizes screw stroke control device accurately to control the stroke of screw rod, when moving, screw rod can drive piston to move, imbitition when piston moves, the volume of its imbitition is the distance that moves of screw rod and the product of piston cross-sectional area, accurately can control the stroke of screw rod by screw stroke control device, thereby accurately control the volume of pipette imbitition, can reach the high-precision fixed requirement that measures liquid.
Brief description of the drawings
Fig. 1 is wherein a kind of structural representation of the utility model quantitative liquid shifter;
Fig. 2 is another structural representation of the utility model quantitative liquid shifter;
Description of symbols in figure: pipette 1, cylindrical shell 2, upper cover plate 301, lower cover 302, pipette connector 4, piston 5, screw rod 6, screw stroke control device 7, nut 70, the first angular wheel 701, the second angular wheel 702, rotary handle 703, fixed muffle 704, support 705, angle scale 706, pointer 707, the first stud wheel 708, the second stud wheel 709, connecting axle 710, stepper motor 711, tube connector 712, single-chip microcomputer 717, digital display tube 718, radiator fan 719, position-limiting drum 720, limited block 721, L-type arc plate 722, safety gas cylinder 8, venthole 801, vent plug 802, bracket 9, pipette draw-in groove 901.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, 2, this quantitative liquid shifter, comprise the cylindrical shell 2 of hollow, the two ends up and down of described cylindrical shell 2 seal by upper cover plate 301 and lower cover 302 respectively, described upper cover plate 301 is provided with the pipette connector 4 with cylindrical shell 2 internal communication, is provided with piston 5 and screw rod 6 in described cylindrical shell 2, and described screw rod 6 one end are fixed on piston 5, the other end extends to cylindrical shell 2 outsides along the axial direction of cylindrical shell 2, on described screw rod 6, is provided with screw stroke control device 7.This quantitative liquid shifter utilizes screw stroke control device 7 accurately to control the stroke of screw rod 6, when moving, screw rod 6 can drive piston 5 to move, imbitition when piston 5 moves, the volume of its imbitition is the distance that moves of screw rod 6 and the product of piston 5 cross-sectional areas, accurately can control the stroke of screw rod 6 by screw rod 6 travel control devices, thereby accurately control the volume of pipette 1 imbitition, can reach the high-precision fixed requirement that measures liquid, in the time of imbitition, can on pipette connector 4, connect pipette 1 also can not connect, conventionally for ensure draw liquid not contaminated, conventionally in the time of operation, all can connect pipette 1, and described pipette 1 connects by pipette 1 connector, thereby can change easily according to different demands the pipette 1 of different size.
In the above-described embodiment, described screw stroke control device 7 can adopt various ways to realize, can adopt pure frame for movement to realize, also realize in the mode that adopts electronic control, as a kind of preferred mode be wherein: described screw stroke control device 7 comprises the first angular wheel 701, the second angular wheel 702 and be set in the nut 70 on screw rod 6, between described nut 70 and lower cover 302, be provided with position-limiting drum 720, the lower end of described position-limiting drum 720 and nut 70 are fixed together, described position-limiting drum 720 outer surface of upper are fixed with limited block 721, also comprise the L-type arc plate 722 being fixed on lower cover 302, described limited block 721 be stuck in the groove that L-type arc plate 722 surrounds with lower cover 302 and the height of limited block 721 and the height of groove consistent, described the first angular wheel 701 is fixedly connected with nut 70 and the central axis of the first angular wheel 701 and the central axes of nut 70, orthogonal and the second angular wheel 702 of the central axis of the central axis of described the second angular wheel 702 and the first angular wheel 701 and the first angular wheel 701 are intermeshing, on described the second angular wheel 702, be connected with rotary handle 703, on described rotary handle 703, be arranged with fixed muffle 704, described fixed muffle 704 is fixedly connected with cylindrical shell 2 by support 705, on described support 705, be fixed with angle scale 706, the central axes of the central axis of described angle scale 706 and rotary handle 703, on described rotary handle 703, be fixed with pointer 707, in the time that rotary handle 703 rotates, pointer 707 is along with the different graduation marks of the rotation orientation angle dish 706 of rotary handle 703.The course of work of this screw stroke control device 7 is as described below: in the time that needs are drawn a certain amount of liquid, only need to rotate rotary handle 703, rotary handle 703 drives the second angular wheel 702 to rotate, due to the second angular wheel 702 and the first angular wheel 701 intermeshing, therefore, the second angular wheel 702 can drive the first angular wheel 701 to rotate, because the first angular wheel 701 is fixedly connected with nut 70, the first angular wheel 701 can drive nut 70 to rotate in the process of rotating, and then screw rod 6 is moved, the distance L that screw rod 6 moves is by the pitch d of screw rod 6, the number N of teeth 1 of the first angular wheel 701, the angle θ that the number N of teeth 2 of the second angular wheel 702 and rotary handle 703 turn over determines, concrete account form is as follows: distance L=N2*d* θ/N1*360 ° that screw rod 6 moves, the liquid volume V=LS drawing, wherein S is the cross-sectional area of piston 5, when need to emit in pipette 1 liquid time, only need opposite spin handle 703, the volume of emitting liquid calculates according to above-mentioned formula equally.
In order further to improve the precision of quantitative liquid getting, the ratio of the number N of teeth 1 of described the first angular wheel 701 and the number N of teeth 2 of the second angular wheel 702 is i=2～5, like this when rotary handle 703 rotates 2～5 circles, screw rod 6 just moves the distance of a pitch, can finely tune the stroke of screw rod 6 like this.
In order further to improve the precision of quantitative liquid getting, between described the second angular wheel 702 and rotary handle 703, be provided with deceleration device, described deceleration device comprises the first stud wheel 708, the second stud wheel 709, connecting axle 710, described connecting axle 710 is fixed on support 705 by bearing, the number of teeth of described the first stud wheel 708 is N3, the number of teeth of the second stud wheel 709 is N4, the ratio of the number N of teeth 3 of described the first stud wheel 708 and the number N of teeth 4 of the second stud wheel 709 is j=2～5, described the first stud wheel 708 and the second angular wheel 702 are separately fixed at the two ends of connecting axle 710, the second stud wheel 709 is fixed on the termination of rotary handle 703, and described the first stud wheel 708 and the second stud wheel 709 are intermeshing, now, liquid volume V=S*N2*N4*d* θ/N1*N3*360 ° that rotary handle 703 is drawn, by deceleration device is set, in the time that screw rod 6 moves the distance of a pitch, rotary handle 703 need to rotate 4～25 circles and could realize, so just can control more accurately the stroke of screw rod 6, improve the precision of quantitative liquid getting.For example, in the time of the pitch d=0.1cm of screw rod 6, the cross section radius of piston 5 is 3cm, the ratio of the number N of teeth 1 of the first angular wheel 701 and the number N of teeth 2 of the second angular wheel 702 is i=2, the ratio of the number N of teeth 3 of the first stud wheel 708 and the number N of teeth 4 of the second stud wheel 709 is j=2, when rotary handle 703 turns over 180 °, distance L=0.0125cm that screw rod 6 moves, the cross-sectional area of piston 5 is S=π * 3cm*3cm=28.26cm
2, the liquid volume of absorption is V=LS=28.26*0.0125=0.35325ml, can be as accurate as after decimal point five.
For the whole liquid process of getting is completed automatically, on described rotary handle 703, be connected with the automaton for driving rotary handle 703 to rotate.
Described screw stroke control device 7 can also adopt another preferred mode: described screw stroke control device 7 comprises the nut 70 being set on screw rod 6 and the automaton rotating for drive nut 70, this mode adopts the mode of automatic control to realize, and the displacement of screw rod 6 is realized by automaton.
Described automaton can adopt existing various control system to realize, and is: the single-chip microcomputer 717 that described automaton comprises stepper motor 711 and rotates for control step motor 711 as the preferred mode of one.By predefined parameter input single-chip microcomputer 717, utilize single-chip microcomputer 717 to calculate stepper motor 711 and need the number of turns of rotating, and then control step motor 711 rotates, in the time that the rotation number of turns reaches the regulation number of turns, single-chip microcomputer 717 sends signal quits work stepper motor 711, in order to make operating personnel know timely the progress of absorption, on described single-chip microcomputer 717, be connected with fixed number alarm.When need to emit in pipette 1 liquid time, adopt in the same way, make stepper motor 711 reversion.In order to make the state of real-time understanding pipette 1 imbitition of operating personnel, on described single-chip microcomputer 717, be connected with digital display tube 718, the real-time convenient operation personnel that reflect of amount of liquid that pipette 1 can be drawn like this observe understanding.
Overheated after working long hours for fear of stepper motor 711, on described stepper motor 711, be provided with radiator fan 719.
For preventing suction phenomenon, between described pipette 1 connector and cover plate 3, be provided with safety gas cylinder 8, on described safety gas cylinder 8, be provided with venthole 801, described venthole 801 seals by vent plug 802, safety gas cylinder 8 sizes are less, can one-handed performance, can prevent from inhaling and can prevent that again user from producing sense of fatigue.
In chemical experiment teaching process, need to use the pipette 1 of all size range and carry out imbitition, choose for the convenience of the users pipette 1, on described cylindrical shell 2, be provided with bracket 9, on described bracket 9, be provided with multiple pipette draw-in grooves 901, the pipette of all size range 1 can be stuck in pipette draw-in groove 901 like this, be convenient to take.
Claims (10)
1. quantitative liquid shifter, it is characterized in that: the cylindrical shell (2) that comprises hollow, the two ends up and down of described cylindrical shell (2) are respectively by upper cover plate (301) and lower cover (302) sealing, described upper cover plate (301) is provided with the pipette connector (4) with cylindrical shell (2) internal communication, in described cylindrical shell (2), be provided with piston (5) and screw rod (6), described screw rod (6) one end is fixed on piston (5), the other end extends to cylindrical shell (2) outside along the axial direction of cylindrical shell (2), on described screw rod (6), be provided with screw stroke control device (7).
2. quantitative liquid shifter as claimed in claim 1, it is characterized in that: described screw stroke control device (7) comprises the first angular wheel (701), the second angular wheel (702) and be set in the nut (70) on screw rod (6), between described nut (70) and lower cover (302), be provided with position-limiting drum (720), the lower end of described position-limiting drum (720) and nut (70) are fixed together, described position-limiting drum (720) outer surface of upper is fixed with limited block (721), also comprise the L-type arc plate (722) being fixed on lower cover (302), described limited block (721) be stuck in the groove that L-type arc plate (722) surrounds with lower cover (302) and the height of limited block (721) and the height of groove consistent, described the first angular wheel (701) is fixedly connected with nut (70) and the central axis of the first angular wheel (701) and the central axes of nut (70), the central axis of the central axis of described the second angular wheel (702) and the first angular wheel (701) is orthogonal and the second angular wheel (702) is intermeshing with the first angular wheel (701), on described the second angular wheel (702), be connected with rotary handle (703), on described rotary handle (703), be arranged with fixed muffle (704), described fixed muffle (704) is fixedly connected with cylindrical shell (2) by support (705), on described support (705), be fixed with angle scale (706), the central axes of the central axis of described angle scale (706) and rotary handle (703), on described rotary handle (703), be fixed with pointer (707), in the time that rotary handle (703) rotates, pointer (707) is along with the different graduation marks of the rotation orientation angle dish (706) of rotary handle (703).
3. quantitative liquid shifter as claimed in claim 2, it is characterized in that: the number of teeth of described the first angular wheel (701) is N1, the number of teeth of the second angular wheel (702) is N2, and the ratio of the number N of teeth 2 of the number N of teeth 1 of described the first angular wheel (701) and the second angular wheel (702) is i=2～5.
4. quantitative liquid shifter as claimed in claim 3, it is characterized in that: between described the second angular wheel (702) and rotary handle (703), be provided with deceleration device, described deceleration device comprises the first stud wheel (708), the second stud wheel (709), connecting axle (710), described connecting axle (710) is fixed on support (705) by bearing, the number of teeth of described the first stud wheel (708) is N3, the number of teeth of the second stud wheel (709) is N4, the ratio of the number N of teeth 4 of the number N of teeth 3 of described the first stud wheel (708) and the second stud wheel (709) is j=2～5, described the first stud wheel (708) and the second angular wheel (702) are separately fixed at the two ends of connecting axle (710), the second stud wheel (709) is fixed on the termination of rotary handle (703), and described the first stud wheel (708) is intermeshing with the second stud wheel (709).
5. quantitative liquid shifter as claimed in claim 4, is characterized in that: on described rotary handle (703), be connected with the automaton for driving rotary handle (703) to rotate.
6. quantitative liquid shifter as claimed in claim 1, it is characterized in that: described screw stroke control device (7) comprises the nut (70) being set on screw rod (6) and the automaton rotating for drive nut (70), and described nut (70) is connected with automaton by tube connector (712).
7. the quantitative liquid shifter as described in claim 5 or 6, it is characterized in that: the single-chip microcomputer (717) that described automaton comprises stepper motor (711) and rotates for control step motor (711), is connected with digital display tube (718) on described single-chip microcomputer (717).
8. quantitative liquid shifter as claimed in claim 7, is characterized in that: on described stepper motor (711), be provided with radiator fan (719).
9. quantitative liquid shifter as claimed in claim 1, it is characterized in that: between described pipette connector (4) and cover plate (3), be provided with safety gas cylinder (8), on described safety gas cylinder (8), be provided with venthole (801), described venthole (801) is by vent plug (802) sealing.
10. quantitative liquid shifter as claimed in claim 9, is characterized in that: on described cylindrical shell (2), be provided with bracket (9), be provided with multiple pipette draw-in grooves (901) on described bracket (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420200926.0U CN203816658U (en) | 2014-04-23 | 2014-04-23 | Quantitative pipettor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420200926.0U CN203816658U (en) | 2014-04-23 | 2014-04-23 | Quantitative pipettor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203816658U true CN203816658U (en) | 2014-09-10 |
Family
ID=51472202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420200926.0U Withdrawn - After Issue CN203816658U (en) | 2014-04-23 | 2014-04-23 | Quantitative pipettor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203816658U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920548A (en) * | 2014-04-23 | 2014-07-16 | 张建明 | Quantitative liquid transferring device |
| CN104760749A (en) * | 2015-04-16 | 2015-07-08 | 冯泰威 | Quantitative type push toothpaste barrel |
| CN110124762A (en) * | 2019-05-07 | 2019-08-16 | 河南康谱生物科技有限公司 | A kind of cell extraction quantitatively adds equipment with extractant |
| CN112098149A (en) * | 2019-06-17 | 2020-12-18 | 中肯(苏州)计量检测技术有限公司 | Liquid sampling, metering and detecting device |
| CN116764712A (en) * | 2023-08-22 | 2023-09-19 | 福建鸿燕化工有限公司 | Acetic acid liquid taking device |
-
2014
- 2014-04-23 CN CN201420200926.0U patent/CN203816658U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920548A (en) * | 2014-04-23 | 2014-07-16 | 张建明 | Quantitative liquid transferring device |
| CN104760749A (en) * | 2015-04-16 | 2015-07-08 | 冯泰威 | Quantitative type push toothpaste barrel |
| CN110124762A (en) * | 2019-05-07 | 2019-08-16 | 河南康谱生物科技有限公司 | A kind of cell extraction quantitatively adds equipment with extractant |
| CN112098149A (en) * | 2019-06-17 | 2020-12-18 | 中肯(苏州)计量检测技术有限公司 | Liquid sampling, metering and detecting device |
| CN112098149B (en) * | 2019-06-17 | 2022-07-19 | 中肯(苏州)计量检测技术有限公司 | Liquid sampling, metering and detecting device |
| CN116764712A (en) * | 2023-08-22 | 2023-09-19 | 福建鸿燕化工有限公司 | Acetic acid liquid taking device |
| CN116764712B (en) * | 2023-08-22 | 2023-10-20 | 福建鸿燕化工有限公司 | Acetic acid liquid taking device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140910 Effective date of abandoning: 20150617 |
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| RGAV | Abandon patent right to avoid regrant |