WO1990005284A1 - A method and apparatus for precise dosage measuring of liquid materials - Google Patents

A method and apparatus for precise dosage measuring of liquid materials Download PDF

Info

Publication number
WO1990005284A1
WO1990005284A1 PCT/FI1989/000206 FI8900206W WO9005284A1 WO 1990005284 A1 WO1990005284 A1 WO 1990005284A1 FI 8900206 W FI8900206 W FI 8900206W WO 9005284 A1 WO9005284 A1 WO 9005284A1
Authority
WO
WIPO (PCT)
Prior art keywords
cogged bar
cogged
bar
cogwheel
roll
Prior art date
Application number
PCT/FI1989/000206
Other languages
French (fr)
Inventor
Juha Aimo
Original Assignee
Tasowheel Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tasowheel Oy filed Critical Tasowheel Oy
Publication of WO1990005284A1 publication Critical patent/WO1990005284A1/en

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Classifications

    • 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
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B01L3/0227—Details of motor drive means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type

Definitions

  • the present invention relates to a method and apparatus with which before defined amount of liquid homogenous material , which fulfills certain demands of noncompressibility , can be measured precisely.
  • a dosage measuring device in which dosage of liquid material is measured from cylinder with piston by pushing and in which the piston is moved with a cogged bar. Measuring devices can be connected side by side , then movements of cogged bars pushing pistons is connected to each other with complex gear. This way measuring devices can produce about different materials a mixture , which has desired composition , motive power is given to the device with hydraulic cylinders.
  • rotating shaft is giving pushing movement to the piston , which is measuring liquid material from the cylinder.
  • the shaft is equipped with thread-part and while rotating the shaft is causing with aid of on thread-part located nut a movement of piston in
  • the device consists a precise scale and a gear to transform rotating movement to be observed on the scale. Measuring is done by rotating hand wheel , which is causing the piston to move in the cylinder.
  • SE-patent publication is presented a measuring device , in which a movement is given to in the cylinder located piston with a cogged bar , which is moving along a slide and is moved by cogwheel. Cogwheel is making movement back and forth only , when it is moved by lever. Length of stroke of the piston is adjusted with profile plate , which is giving levers desired movement.
  • the device according to present invention is providing a significant improvement in earlier mentioned difficulties. Characteristics of the present invention are presented in claim 1.
  • Fig 1 shows measuring device's drive system from side.
  • Fig 2 shows measuring device's drive system from top.
  • Fig 3 shows measuring device assembled on frame plate.
  • Fig 4 shows clearanceless contact between cogwheel and cogged bar.
  • Fig 5 shows clearanceless contact between cogwheel and cogged bar.
  • a measuring device's drive system which consists long shaped frame (1) in which is jointed a slide cylinder , which is guiding movement of cogged bar.
  • a middle member (2) In end of the cogged bar is coupled with screws (4) a middle member (2), dosage cylinder's piston is coupled in middle member (2) with screws (24).
  • Middle member has a slide (20) , which is sliding on inner surface of cylinder (3).
  • a stopper (21) In the end of cylinder (3) there is a stopper (21) and the cylinder is fixed in the frame (1) with screws (23) and (19).
  • the. frame (1) has guiding (28) and fixing hole (22).
  • Cogged bar is moved by stepping motor (26). In the shaft coming out of stepping motor is coupled a cogwheel fitting precisely with cogged bar (5).
  • Cogged bar (5) is all the 'time in precise contact with cogwheel , which is formed in the end of shaft (17).
  • pressing roll (6) which is pressed by spring (15) , and is pressing all the time cogged bar (5) against cogwheel , which is formed on shaft (17).
  • Pressing roll (6) consists a shaft (9) and locking member (8) and flexible plate (7). Supporting member (14) of roll (6) is coupled with pins (11) to
  • a drive system of dosage measuring device in the drive system cogged bar (5) is pressed with pressing roll (6) against cogs, of the shaft (17). Pressing roll (6) is coupled on shaft (9) with bearings (18). Spring (15) is pressing pressing-roll against cogged bar around pin (11). Magnet (27) is fixed in cogged bar , while magnet is passing HALL-detector (16) this is causing in guidance circuits of the device zero-set of position counter.
  • a dosage measuring device assembled on the frame (1).
  • Guidance pin (34) is fitted in hole (28) and the device is fixed with screws (35).
  • the device consists a cylinder (31) with rubber (32) protected end and in which piston (30) is determining amount of dosage while moving certain distance.
  • Piston rod (29) is coupled in middle member (2).
  • the measuring device consists flush- and valve-part (33) and flush-valve (39). Suction and dosage of liquid materials is done through pipe (36).
  • the device consists controlling unit (37) , under which control stepping motor can be guided to rotate desired number of steps back and forth and this way cogged bar is caused to move desired distance.
  • Precise dosage measuring of noncompressible liquid can be done by steering unit (37) which is connected to the stepping motor (26) with cable (38).
  • stepping motor can be replaced with stepping servo motor and to the pressing-roll pressing spring forge can be replaced with gravity forge of mass or with hydraulic pressure.

Landscapes

  • 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)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

A method and apparatus for precise dosage measuring of liquid materials in which ia in measuring cylinder located piston, with adjustable length of stroke, is forming dosage quantity that way, that desired length of piston's stroke is carried out according to stepping orders given to stepping motor by electronic steering unit, rotation movement of stepping motor is transformed to linear movement of piston with combination of cogwheel (17) and cogged bar (5), cogged bar is pressed with constant force against cogwheel with pressing roll (6) essentially in cogwheels position to accomplish contact without clearance between cogs.

Description

A METHOD AND APPARATUS FOR PRECISE DOSAGE MEASURING OF LIQUID MATERIALS
The present invention relates to a method and apparatus with which before defined amount of liquid homogenous material , which fulfills certain demands of noncompressibility , can be measured precisely.
About US-patent n:o 4,515,296 is known a dosage measuring device , in which dosage of liquid material is measured from cylinder with piston by pushing and in which the piston is moved with a cogged bar. Measuring devices can be connected side by side , then movements of cogged bars pushing pistons is connected to each other with complex gear. This way measuring devices can produce about different materials a mixture , which has desired composition , motive power is given to the device with hydraulic cylinders.
In SE-patent publication 440185 rotating shaft is giving pushing movement to the piston , which is measuring liquid material from the cylinder. The shaft is equipped with thread-part and while rotating the shaft is causing with aid of on thread-part located nut a movement of piston in
measuring cylinder. The device consists a precise scale and a gear to transform rotating movement to be observed on the scale. Measuring is done by rotating hand wheel , which is causing the piston to move in the cylinder.
In SE-patent publication is presented a measuring device , in which a movement is given to in the cylinder located piston with a cogged bar , which is moving along a slide and is moved by cogwheel. Cogwheel is making movement back and forth only , when it is moved by lever. Length of stroke of the piston is adjusted with profile plate , which is giving levers desired movement.
In DE-publication 2852073 is presented in the measuring device, located assembly of cogwheel and cogged bar , in which different kind of locking are constructed for cogwheel. As a disadvantage in measuring device presented in patent publication US 4 515,295 is , that with it one material can not be measured precisely at a time , or different amounts of one same material at a time. Also gearing with many steps causes inaccuracy in dosage of materials being mixed.
As a disadvantage in construction according to patent
publication SE 440185 is that several cogwheels and screw gears are causing inaccuracy because of their clearance and during use these inaccuracies increase because of wear. In this construction all dosage amounts have to be rotated manually.
In construction according to patent publication SE 415 935 as a disadvantage is that for each amount measured both stoppers in ends of the piston have to be adjusted according to the dosage , it means that stroke of the piston is adjusted with stoppers separately in every case. Also one must take care every time that stroke of piston is completed from one stopper to an other and that stoppers are staying in their fixed pbsftion.
As a common disadvantage in constructions presented is unsuitability for use in laboratory environment and for automatic precise adjusting of dosage measured.
The device according to present invention is providing a significant improvement in earlier mentioned difficulties. Characteristics of the present invention are presented in claim 1.
As a major benefit of present invention can be mentioned , that very high accuracy is achieved and this accuracy is remaining unchanged during whole life time of the device, change of dosage amounts can be done hygienically without touching the device itself. In following the invention will be examined more closely referring to drawings enclosed , in which
Fig 1 shows measuring device's drive system from side.
Fig 2 shows measuring device's drive system from top.
Fig 3 shows measuring device assembled on frame plate.
Fig 4 shows clearanceless contact between cogwheel and cogged bar.
Fig 5 shows clearanceless contact between cogwheel and cogged bar.
In fig 1 is shown a measuring device's drive system , which consists long shaped frame (1) in which is jointed a slide cylinder , which is guiding movement of cogged bar. In end of the cogged bar is coupled with screws (4) a middle member (2), dosage cylinder's piston is coupled in middle member (2) with screws (24). Middle member has a slide (20) , which is sliding on inner surface of cylinder (3). In the end of cylinder (3) there is a stopper (21) and the cylinder is fixed in the frame (1) with screws (23) and (19). For
mounting of dosage cylinder the. frame (1) has guiding (28) and fixing hole (22). Cogged bar is moved by stepping motor (26). In the shaft coming out of stepping motor is coupled a cogwheel fitting precisely with cogged bar (5). Cogged bar (5) is all the 'time in precise contact with cogwheel , which is formed in the end of shaft (17). This is secured with pressing roll (6) , which is pressed by spring (15) , and is pressing all the time cogged bar (5) against cogwheel , which is formed on shaft (17). Pressing roll (6) consists a shaft (9) and locking member (8) and flexible plate (7). Supporting member (14) of roll (6) is coupled with pins (11) to
supporting frame (13) , which is fixed into the frame (1) with screws (12).
In fig 2 is shown , as seen from the top , a drive system of dosage measuring device , in the drive system cogged bar (5) is pressed with pressing roll (6) against cogs, of the shaft (17). Pressing roll (6) is coupled on shaft (9) with bearings (18). Spring (15) is pressing pressing-roll against cogged bar around pin (11). Magnet (27) is fixed in cogged bar , while magnet is passing HALL-detector (16) this is causing in guidance circuits of the device zero-set of position counter.
In fig 3 is shown a dosage measuring device assembled on the frame (1). Guidance pin (34) is fitted in hole (28) and the device is fixed with screws (35). The device consists a cylinder (31) with rubber (32) protected end and in which piston (30) is determining amount of dosage while moving certain distance. Piston rod (29) is coupled in middle member (2). The measuring device consists flush- and valve-part (33) and flush-valve (39). Suction and dosage of liquid materials is done through pipe (36). The device consists controlling unit (37) , under which control stepping motor can be guided to rotate desired number of steps back and forth and this way cogged bar is caused to move desired distance. Precise dosage measuring of noncompressible liquid can be done by steering unit (37) which is connected to the stepping motor (26) with cable (38).
In fig 4 is shown clearanceless contact between cogged bar (5) and cogwheel (40) in which cog (41) of cogwheel is at the same time in contact with cog (42) and (43) of cogged bar (5) and cogged bar (5) is pressed against cogwheel (40) with pressing roll (6) , which is coupled in pressing frame (14) which is coupled to the frame (13) with pin (11). Pressing forge is caused with spring (15).
In fig 5 is shown clearanceless contact between cogged bar (5) and cogwheel (40) in which cog (43) of cogged bar (5) is at the same time in clearanceless contact with cog (41) and (44) of cogwheel (40) and cogged bar (5) is pressed against cogwheel (40) with pressing roll (6) , which is coupled in pressing frame (14) which is coupled to the frame (13) with pin (11). Pressing forge is caused with spring (15).
Especially should be observed , that stepping motor can be replaced with stepping servo motor and to the pressing-roll pressing spring forge can be replaced with gravity forge of mass or with hydraulic pressure.
While only one embodiment of the present invention has been described in detail herein , various modifications and changes may be applied without departing from the scope of the invention.

Claims

1. A method for precise dosage measuring of liquid materials, where in measuring cylinder (31) located piston with
adjustable length of stroke is forming dosage quantity and rotating movement of stepping motor (26) is transformed to linear movement of piston with aid of combination of cogwheel (17) and cogged bar (5) c h a r a c t e r i z e d in that cogged bar (5) is pressed with constant forge against
cogwheel (17) with pressing roll (6) essentially in
cogwheel's position to accomplish contact without clearance between cogs and in that cogged bar (5) is equipped with at least one location detector (16,17) , which is causing zero- set or calibration in control units pulse counter at least in one position of cogged bar.
2. A method according to claim 1 c h a r a c t e r i z e d in that continual contact with cogs is all the time
receiving and reacting the forge caused with the pressing roll (6).
3. A method according to claim 1 or 2 c h a r a c t e r i ze d in that pressing roll (6) , which is causing a forge against cogged bar (5) can during measuring motion move in both directions of its forge a minimal distance without loss of accuracy because of wear or inaccurate cogs.
4. A method according to claims 1-3 c h a r a c t e r i ze d in that roll (6) is pressing cogged bar (5) with aid of spring (15).
5. A method according to claims 1-3 c h a r a c t e r i ze d in that roll (6) is pressing cogged bar (5) with aid of gravity.
6. A method according to claims 1-3 c h a r a c t e r i ze d in that roll (6) is pressing cogged bar (5) with aid of hydraulic pressure.
7. A method according to claims 1-6 c h a r a c t e r i ze d in that stepping motor's (26) step counter's zero-set in control unit is happening , when magnet (27) coupled in cogged bar (5) is passing HALL-detector (16).
8. A method according to claims 1-6 c h a r a c t e r i ze d in that stepping motor is replaced with servo motor , rotation of which is controlled electronically.
9. An apparatus for carrying out the method according to claim 1 , which apparatus consists measuring cylinder (31) , piston (30) , stepping motor (26) and combination of cogged bar (5) and cogwheel c h a r a c t e r i z e d in that it consists members (15) for producing a constant forge , with aid of which roll (6) is pressed against cogged bar and position detectors (16,17) in the frame of apparatus and in the cogged bar for detecting at least one position of the cogged bar.
PCT/FI1989/000206 1988-11-10 1989-11-10 A method and apparatus for precise dosage measuring of liquid materials WO1990005284A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI885165A FI885165A (en) 1988-11-10 1988-11-10 FOERFARANDE OCH ANORDNING FOER EXAKT DOSERING AV FLYTANDE AEMNEN.
FI885165 1988-11-10

Publications (1)

Publication Number Publication Date
WO1990005284A1 true WO1990005284A1 (en) 1990-05-17

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Application Number Title Priority Date Filing Date
PCT/FI1989/000206 WO1990005284A1 (en) 1988-11-10 1989-11-10 A method and apparatus for precise dosage measuring of liquid materials

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FI (1) FI885165A (en)
WO (1) WO1990005284A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4107479A1 (en) * 1991-03-08 1992-09-10 Dynamic Antriebstechnik Gmbh Dosing arrangement for liquids or pastes for medical media - has piston movable axially in chamber with dispensing needle tip, electric motor driving piston rod via transmission
WO2006018148A2 (en) * 2004-08-10 2006-02-23 Heraeus Kulzer Gmbh Multi-compartment dosing for small amounts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2031049A5 (en) * 1969-02-26 1970-11-13 Desaga Gmbh Nachf Erich Micro dispenser for use in microchemistry - chromatography
FR2277332A1 (en) * 1974-07-05 1976-01-30 Tacussel Jacques Piston burette with motor control - useful in automatic titrations over a wide range of liq. rates
DE2937066A1 (en) * 1979-09-13 1981-03-26 Clinicon International Gmbh, 6800 Mannheim DOSING DEVICE
GB2093561A (en) * 1981-02-24 1982-09-02 Riv Officine Di Villar Perosa Support element for a motor vehicle steering box rack
EP0140622A1 (en) * 1983-10-13 1985-05-08 Corning Glass Works Friction drive for fluid metering system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2031049A5 (en) * 1969-02-26 1970-11-13 Desaga Gmbh Nachf Erich Micro dispenser for use in microchemistry - chromatography
FR2277332A1 (en) * 1974-07-05 1976-01-30 Tacussel Jacques Piston burette with motor control - useful in automatic titrations over a wide range of liq. rates
DE2937066A1 (en) * 1979-09-13 1981-03-26 Clinicon International Gmbh, 6800 Mannheim DOSING DEVICE
GB2093561A (en) * 1981-02-24 1982-09-02 Riv Officine Di Villar Perosa Support element for a motor vehicle steering box rack
EP0140622A1 (en) * 1983-10-13 1985-05-08 Corning Glass Works Friction drive for fluid metering system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4107479A1 (en) * 1991-03-08 1992-09-10 Dynamic Antriebstechnik Gmbh Dosing arrangement for liquids or pastes for medical media - has piston movable axially in chamber with dispensing needle tip, electric motor driving piston rod via transmission
WO2006018148A2 (en) * 2004-08-10 2006-02-23 Heraeus Kulzer Gmbh Multi-compartment dosing for small amounts
WO2006018148A3 (en) * 2004-08-10 2006-07-20 Heraeus Kulzer Gmbh Multi-compartment dosing for small amounts
CN100439872C (en) * 2004-08-10 2008-12-03 贺利氏古萨有限公司 Multi-compartment dosing for small amounts

Also Published As

Publication number Publication date
FI885165A (en) 1990-05-11
FI885165A0 (en) 1988-11-10
AU4491089A (en) 1990-05-28

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