EP1195518A2 - Procédé et dispositif pour le pompage dosé - Google Patents

Procédé et dispositif pour le pompage dosé Download PDF

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Publication number
EP1195518A2
EP1195518A2 EP01123104A EP01123104A EP1195518A2 EP 1195518 A2 EP1195518 A2 EP 1195518A2 EP 01123104 A EP01123104 A EP 01123104A EP 01123104 A EP01123104 A EP 01123104A EP 1195518 A2 EP1195518 A2 EP 1195518A2
Authority
EP
European Patent Office
Prior art keywords
piston
housing
movable piston
movable
distance
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.)
Withdrawn
Application number
EP01123104A
Other languages
German (de)
English (en)
Other versions
EP1195518A3 (fr
Inventor
Erwin Rein
Daniel Koehler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1195518A2 publication Critical patent/EP1195518A2/fr
Publication of EP1195518A3 publication Critical patent/EP1195518A3/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/003—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by piezoelectric means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/008—Piston machines or pumps characterised by having positively-driven valving the distribution being realised by moving the cylinder itself, e.g. by sliding or swinging

Definitions

  • the present invention relates to a device for Dosing of material with a fixed piston, a movable one Piston and a movable housing with a lockable with one of the pistons by moving the housing Material supply and one with one of the pistons material discharge that can be closed by moving the housing, the axis of the fixed piston with the axis of the movable piston is aligned and between fixed piston and the movable piston at least then there is a distance in the area of the material feed if the material supply is open.
  • the invention further relates to a method of dosing material in which (A) Material by a material supply to a filling area Housing is fed during a material export the housing of a fixed piston or a movable Piston is closed, the filling area at least is partially formed by a distance which between the fixed piston and the movable piston is present, the axis of the fixed piston with the The axis of the movable piston is aligned, (B) the housing is moved in a first direction so that the material feed from the fixed piston or the movable one Piston is closed and the material discharge opened , (C) the movable piston is fed so that the distance between the fixed piston and the movable one Pistons decreased and material from material export emerges, (D) the movable piston is returned is so that the distance between the fixed Piston and the movable piston enlarged, and (E) that Housing is moved in a second direction, which the first direction is opposite.
  • the dynamic pressure of the adhesives can be adjusted via the metering speed regulate. Fast dosing leads to one high back pressure; slow dosing has a low one Pressure. It should also be emphasized that the choice of one perfect length of stay is an important requirement for repeatable dosing. This applies to both for the length of stay before as well as for the length of stay after dosing. By choosing the appropriate length of stay you give the glue the time it takes to finish Relieve back pressure, so that the repeatability is optimized.
  • a difficult problem of the procedures of the State of the art is that the flow behavior the liquid due to the wetting properties of the substrate to which the liquid is applied should be very different. By different Wetting properties can cause major inaccuracies result.
  • the surface tension in terms of different involved materials is one of the biggest problems with regard to the exact Dosage.
  • an appropriate one Pretreatment to be taken are very time consuming and expensive.
  • the Surface tension affects slow drop formation the most on the needle. From a slow one Drop formation results in poor material removal. at the surface tension affects the formation of drops very quickly hardly or not at all between the dispensing needle and the adhesive not from. You shoot the drop according to the inkjet printer principle out of the needle.
  • the dynamic pressure in the dispensing needle influences to a great extent the repeatability of the point order. This in particular for the reason that it's discretionary which values set the dwell times during dosing become. Depending on the setting, the desired volume can be reached a residual ingredient is added, or the volume becomes only delivered incomplete. Also with regard to the Back pressure offers rapid drop formation advantages, because the dynamic pressure can be reduced many times over. You have to keep the process time low so that the Reduce the dynamic pressure in a flash via the metering needle bore got to.
  • the needle distance to the component is also very important, to counteract the surface tension.
  • the setting correct needle spacing is extremely complex, especially due to the required precision of the mechanical components. This problem too can be circumvented using the inkjet printer principle, that is, by shooting the adhesive at the component becomes. Because of this, the needle distance to the component adjustable to a certain extent. This is a crucial advantage for series production, especially with a view to saving costs, since there is no need for a Z-stroke query.
  • the invention builds on the prior art according to the Preamble of claim 1 characterized in that the movable Piston can be controlled by a piezo actuator.
  • a piezo actuator makes it possible to use a piston pump to provide which the material according to the inkjet printer principle from a reservoir shoots out.
  • Piezo actuators can be highly accurate with very little Strokes work so that extremely small volumes are dosed.
  • Piezo actuators are also able to To feed pistons an enormous acceleration, so that the material is unaffected by the problems described of the prior art emerge from a metering needle can. In particular, the problems are considered on the surface tension, the dynamic pressure and the setting of the needle distance to the component is eliminated.
  • the fixed piston is preferably in a precision bushing held, the movable piston is from the precision bush out, and the precision bush is in the Housing arranged.
  • the precision in terms of arrangement and the guidance of the pistons is an important requirement for setting exact volumes and for good reproducibility of the dosing processes.
  • the amount of material to be dosed of that in the case of open material supply Distance between the fixed piston and the movable one Piston depends in the area of the material feed.
  • the piezo actuator by an adjusting screw can be positioned. In this way the system can be adjusted, the one exact setting of the respective components relative to each other.
  • the adjusting screw for setting the in the case of open material supply existing distance between the fixed piston and the movable piston and the adjusting screw for positioning of the piezo actuator are identical. So you have one Adjustment screw with two functions, what with regard a simple construction of the piston pump is useful.
  • the piezo actuator is preferably of the order of magnitude for a stroke of 100 ⁇ m. With such strokes extremely small volumes can be precisely dosed.
  • the piezo actuator for a Acceleration in the order of 100000 g suitable is.
  • the movable piston and thus the material to be dosed also has a high acceleration fed so that the material is unaffected from the surface tension and the dynamic pressure the metering opening is shot out.
  • the material export has a dispensing needle.
  • the device preferably has a control. On in this way a dosing process can be automated and execute with a high number of cycles.
  • the method according to the invention is based on the prior art Technology according to the preamble of claim 12 thereby that the movable piston is controlled by a piezo actuator becomes.
  • the inventive Advantages of the device are implemented procedurally.
  • the distance between the fixed piston and the movable piston for determining the dosing Volume set. You got through this way a simple setting measure the preselection of the to be dosed Volume in hand.
  • the method is particularly advantageous when using this Adhesive is dosed. Especially when it comes to glue are extreme precise dosages desired. It also switches Process the problem with regard to compressibility and the dynamic pressure of the adhesive; this in particular due to the high speed of ejection of the material.
  • the piezo actuator is preferably provided with a stroke in the Order of magnitude of 100 ⁇ m. Strokes of this size allow highly precise dosing of small amounts of material.
  • the piezo actuator is preferred with an acceleration in on the order of 100,000 g.
  • This acceleration is an explosive discharge of the adhesive possible, so the disadvantages in terms of Surface tension and back pressure can be avoided.
  • the housing is preferably provided by a pneumatic cylinder emotional. This is a highly precise and quick positioning of the housing during the course of the procedure possible.
  • the method is preferably controlled by a controller.
  • the process is automatic Manufacturing process can be used at high speed.
  • the invention is based on the surprising finding that the use of a piezo actuator in a piston pump eliminates numerous problems which are evident in the metering of very small quantities of material. Due to the rapid formation of drops, the surface tension between the metering opening and the material to be dispensed has little or no effect. The back pressure in the dispensing needle is reduced many times over. The dispensing needle distance to the component is variable. If you compare the piezoelectric actuator with conventional actuator concepts, you will get an evaluation according to the following table (symbols: +: good, high; 0: medium; -: bad, low). The piezoelectric concept wins in particular with regard to the actuating time and also with regard to the consistently good evaluation with the various evaluation parameters. Steep link concept resolution Travel Range force Operating time Power density Temp range piezoelectric + - + + + + + + + + + 0 electromagnetic - + - - - + Pneumatic - + - - - + hydraulic - + + - + -
  • FIG. 1 is a piston pump for dosing material shown partially cut.
  • the device contains a fixed piston 10 and a movable piston 12.
  • the fixed piston 10 and the movable piston 12 are axially aligned so that they are aligned.
  • the device further includes a movable housing 14. Inside the housing is a precision socket 16, of which of the fixed pistons 10 is held and in which the movable piston 12 is guided.
  • the housing 14 and the precision bushing 16 have lateral holes, from one as material supply 18 and the other for material export 20 serves.
  • Inside the precision bush 16 a filling chamber 22 is formed by the ends of the fixed piston 10 and the movable piston 12 one Have distance from each other, which due to the Mobility of the movable piston 12 is changeable.
  • the fixed piston 10 ends approximately in the middle between the material feed 18 and the Material removal 20, which can be seen from a vertical line is.
  • the movable piston 12 ends in the present Representation at the position at which the dash-dot line ends.
  • This dash-dot line defines one Middle position of the movable housing 14.
  • Double arrow above the housing 14 indicates that the housing 14 moves through a pneumatic cylinder 24 leaves.
  • the precision bush 16 is through seals 26 sealed to the outside.
  • the housing 14 is through Screws 28 held together.
  • the housing 14 is in the illustrated state in a position in which the material feed 18 is open and opens into the free space 22.
  • the material removal 20 is however, closed by the fixed piston 10. In this Condition can thus material get into the filling chamber 22.
  • the amount of material to be dosed can be checked the size of the filling chamber 22 and thus by the distance between the fixed piston 10 and the movable piston Set 12. If the filling chamber 22 is filled, it will Housing 14. Moved to the left by the pneumatic cylinder 24.
  • the material feed 18 is by the movable piston 12 closed during the material removal 20 is opened.
  • the housing 14 moves under Action of the pneumatic cylinder 24 again in the illustrated Home position, and the movable piston 12th also goes back to its starting position shown.
  • the execution is for the inclusion of a further dose of material prepared.
  • FIG. 2 details the construction of a part a piston pump with a piezo actuator 30.
  • This construction includes a main plate 32 on which the other components directly or indirectly are attached.
  • the piezo actuator 30 is via a holder 34 and disks 36, 38 fixed with respect to the main plate 32.
  • the piezo actuator 30 is held by a holder 40 held, which is screwed directly to the main plate 32 is.
  • To adjust the piezo actuator 30 is one Adjustment screw 42 is provided, which in the holder 34th sitting.
  • the adjusting screw 42 can also be the distance between the movable piston 12 and that in FIG. 2 Adjust the fixed piston, not shown, whereby the volume to be dosed can be selected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating Apparatus (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP01123104A 2000-10-04 2001-09-27 Procédé et dispositif pour le pompage dosé Withdrawn EP1195518A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000148924 DE10048924C2 (de) 2000-10-04 2000-10-04 Vorrichtung und Verfahren zum Dosieren von Material
DE10048924 2000-10-04

Publications (2)

Publication Number Publication Date
EP1195518A2 true EP1195518A2 (fr) 2002-04-10
EP1195518A3 EP1195518A3 (fr) 2003-07-02

Family

ID=7658526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01123104A Withdrawn EP1195518A3 (fr) 2000-10-04 2001-09-27 Procédé et dispositif pour le pompage dosé

Country Status (2)

Country Link
EP (1) EP1195518A3 (fr)
DE (1) DE10048924C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107899627A (zh) * 2017-11-17 2018-04-13 北京红海科技开发有限公司 用于液体计量取用的初始定位***和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017207851B4 (de) * 2017-05-10 2023-02-16 Audi Ag Vorrichtung und Verfahren zum Auftragen von flüssigem Klebstoff

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE79345C (de) * Maschinenfabrik Kappel, Kappel-Chemnitz Ventillose Pumpe mit zwei Kolben
CH569883A5 (en) * 1973-06-27 1975-11-28 Nestle Sa Volumetric pump with piston inside slider - has piston and slider raised and lowered by cranks of independent actuator pistons
US4405294A (en) * 1980-10-11 1983-09-20 Dragerwerk Ag Dosing pump
US5024587A (en) * 1989-01-12 1991-06-18 Dragerwerk Aktiengesellschaft Valveless pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3745068C2 (de) * 1987-11-19 1995-08-10 Schuetze Alfred App Dosierventil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE79345C (de) * Maschinenfabrik Kappel, Kappel-Chemnitz Ventillose Pumpe mit zwei Kolben
CH569883A5 (en) * 1973-06-27 1975-11-28 Nestle Sa Volumetric pump with piston inside slider - has piston and slider raised and lowered by cranks of independent actuator pistons
US4405294A (en) * 1980-10-11 1983-09-20 Dragerwerk Ag Dosing pump
US5024587A (en) * 1989-01-12 1991-06-18 Dragerwerk Aktiengesellschaft Valveless pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107899627A (zh) * 2017-11-17 2018-04-13 北京红海科技开发有限公司 用于液体计量取用的初始定位***和方法

Also Published As

Publication number Publication date
DE10048924C2 (de) 2003-01-02
DE10048924A1 (de) 2002-05-29
EP1195518A3 (fr) 2003-07-02

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