EP0301016A1 - Dispositif de dosage et de melange de systemes a composants fluides multiples. - Google Patents

Dispositif de dosage et de melange de systemes a composants fluides multiples.

Info

Publication number
EP0301016A1
EP0301016A1 EP87902376A EP87902376A EP0301016A1 EP 0301016 A1 EP0301016 A1 EP 0301016A1 EP 87902376 A EP87902376 A EP 87902376A EP 87902376 A EP87902376 A EP 87902376A EP 0301016 A1 EP0301016 A1 EP 0301016A1
Authority
EP
European Patent Office
Prior art keywords
component
bellows
pressure
cylinder
space
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.)
Granted
Application number
EP87902376A
Other languages
German (de)
English (en)
Other versions
EP0301016B1 (fr
Inventor
Hans Willi Meinz
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT87902376T priority Critical patent/ATE61946T1/de
Publication of EP0301016A1 publication Critical patent/EP0301016A1/fr
Application granted granted Critical
Publication of EP0301016B1 publication Critical patent/EP0301016B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8823—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using diaphragms or bellows

Definitions

  • the invention relates to a device for metering and mixing flowable multicomponent systems, in particular polyurethane systems, with at least one cylinder space arranged in a cylinder housing for each component, with one displacement element in each cylinder space, the displacement elements being coupled synchronously with the cycle and conveying, and with a mixing chamber to which the cylinder rooms are connected.
  • a device which is intended for metering two reactive and flowable components via pipes in a mixing chamber.
  • This known device has two pistons coupled to one another, the displacement of which corresponds to the stoichiometric ratio of the substances to be mixed, the two pistons being rigidly connected to one another by a piston rod and arranged in cylinders, the cylinder sections of which lying in front of them in the direction of the working stroke Components are filled.
  • the cylinder containing the less problematic component consists of a commercially available hydraulic cylinder with piston, the cylinder section lying behind the piston in the direction of the working stroke being connectable to a source of higher pressure; the cylinder filled with the more problematic component, on the other hand, contains a piston covered with a rubber-elastic roll membrane, the cylinder section lying behind the piston in the direction of the working stroke being connectable to the atmosphere or a vacuum source.
  • the known device is designed only to convey a flowable component. A hydraulic or mechanical coupling of the displacement elements of this pump is not provided.
  • a disadvantage of this known device is that it due to pneumatic pressurization of the bellows a clock-synchronized and conveyor-synchronous coupling of two or more bellows pumps is not permitted.
  • the object of the present invention is now to design a device for metering and mixing flowable multicomponent systems in such a way that they are both the most abrasive, e.g. materials that tend to crystallize, as well as chemically aggressive liquids can be processed, the dosage ratio being able to be changed as desired in a manner known per se.
  • each cylinder space is divided into a component space and a pressure space by the displacement element, and at least one displacement element is designed as a flexible bellows, one end of which is hermetically sealed and supported on the cylinder housing and the other end is closed by a floor.
  • This device thus has two or more displacement elements which are coupled to one another in a clock-synchronized and conveyor-synchronous manner, wherein at least one displacement element consists of a flexible bellows and the other displacement elements can be designed, for example, as conventional pistons.
  • all displacement elements will be designed as bellows, since in most cases they enable much cheaper and more durable designs than conventional pistons and cylinders.
  • the operational readiness or the service life of the device is not affected by corrosion or deposits.
  • the bellows are completely wear-free. Even if deposits form on the surfaces of the bellows during operation, there are no serious malfunctions Furthermore, when using bellows, the cylinder inner surfaces do not need to be machined.
  • the device according to the invention offers many advantages in terms of maintenance and operational safety.
  • the components can be metered batchwise. Depending on the size of the bellows, shot volumes in the order of 50 1 maximum can be achieved.
  • Automatic control of the working and filling stroke is expedient. With automatic control, the component rooms are automatically refilled after each shot from compressed gas-laden storage containers. The filling times are so short with this system concept that they generally do not have a disturbing effect even with large shot volumes.
  • the device according to the invention can implement any desired dosage ratio in any pressure range, since the bellows are only ever loaded by an extremely low differential pressure.
  • the device can be designed such that each component space has almost the same pressure level as the corresponding pressure space.
  • the device can be designed so that the flexible bellows consists of austenitic stainless steel.
  • This embodiment is particularly advantageous when the temperatures of the components to be dosed are high (over 150 ° C), the components are particularly chemically aggressive (e.g. liquid alkali metals) or particularly abrasive (e.g. liquid plastics with mineral fillers).
  • the components are particularly chemically aggressive (e.g. liquid alkali metals) or particularly abrasive (e.g. liquid plastics with mineral fillers).
  • the device can be designed so that the flexible bellows consists of polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the bellows are made of PTFE without cutting from preformed blanks, and the bellows can also be formed with a closed base.
  • PTFE bellows reach 10 to 10 9 cycles. With the same displacement volume, the cost of a PTFE bellows is much lower than that of a stainless steel bellows.
  • the device can be designed such that the flexible bellows consists of an extrusion or injection-blown thermoplastic.
  • the bellows made of thermoplastic materials by extrusion or injection blow molding are characterized by high resistance to many chemicals and by an unrivaled low price compared to all others Bellows embodiments. They can therefore be regarded as cheap disposable parts that can be replaced with little effort, for example to remove component deposits or to change the fixed dosage ratio of the components. As a rule, the bellows will be designed with a closed bottom, so that the displacement element consists of only one component. A two-part version with a separately manufactured base is only recommended if standard bellows are to be used (e.g. for small series).
  • FIG. 1 shows a device in a low-pressure version for discontinuous two-component metering
  • Fig. 2 shows a device in high pressure design for continuous two-component metering.
  • Fig. 1 shows a particularly simple embodiment of the invention, in which the device in two-component design with two axially successively arranged cylinder spaces and each with an associated bellows and a connected mixing chamber and two storage containers for the two components is formed, the metering stroke by pneumatic pressurization of the bellows in the low pressure range.
  • the device shown consists essentially of two axially successively arranged cylinder spaces 1, 2 with bellows 3, 4 located therein, which are firmly connected to one another via a piston rod 5 and which form the cylinder spaces Divide 1,2 into a component space 6,7 and into a pressure space 8,9. Furthermore, the device has two storage containers 12, 13 connected to the component spaces 6, 7 via a check valve 10, 11 as well as a mixing chamber 14 which is connected directly to the component space 6 and to the component space 7 via a check valve 15 and a compressed air line 16.
  • the cylinder spaces 1, 2 are of the same diameter, so that any metering ratio can be achieved by exchanging the bellows 4.
  • the bellows 3, 4 used here are stockable PTFE pointed bellows of the same length with different diameters according to the desired dosage ratio, the bottoms 17, 18 of which are made of sheet steel and the divided steel flanges 19, 20, 21, 22 on the cylinder covers 23, 24 and Floors 17, 18 are fastened by screws, spring elements or resilient elastomer inserts between the steel flange 19, 20, 21, 22 and bellows flange 25, 26, 27, 28 to be used under the screws in order to provide an effective seal between component space 6 , 7 and pressure chamber 8.9.
  • the pressure level in the pressure rooms 8.9 and the component rooms 6.7 is almost the same in all operating states of the device.
  • this condition is met particularly simply by loading compressed air into the pressure spaces 8, 9 and the storage containers 12, 13, the pressures p 1 and p 3 being kept at a constant pressure level with p 1 ⁇ p 3 and the pressure P 2 raised to p 3 during the working stroke and lowered to p 1 during the filling stroke.
  • the differential pressure between the component spaces 6, 7 and the pressure spaces 8, 9 does not rise to an impermissibly high level.
  • the bellows 4 synchronously conveys the component 42 from the component space 7 via the open check valve 15 into the compressed air line 16, the component 42 supplied to the compressed air 41 being pressed into the mixing chamber 14 by the flowing compressed air 41 and being fed there directly to the mixing chamber 14 Component 40 is mixed.
  • the metering stroke can be interrupted at any time by simultaneously closing the two shut-off valves 38, 39.
  • the component spaces 6, 7 are filled from the storage containers 12, 13 by lowering the pressure p 2 in the pressure spaces 8, 9 to the pressure p 1 , which in the storage containers 12, 13 by compressed air loading via fixed pressure reducers (not shown). is always kept at a constant pressure level. Likewise, the pressure p 3 in the compressed air line 16 leading to the mixing chamber 14 is always kept constant at a fixed pressure level, which is higher than p 1 .
  • the device shown essentially consists of four individually arranged cylinder spaces 43, 44, 45, 46 with bellows 47, 48, 49.50 located therein, which each separate the cylinder spaces 43, 44, 45, 46 into a component space 51, 52, 53. 54 and divide into a pressure chamber 55,56,57,58.
  • the bellows 47, 48, 49, 50 are coupled to each other hydraulically and synchronously via an electric double-shaft motor 59 and two variable pumps 60, 61, the metering ratio being infinitely adjustable in a known manner.
  • the metering stroke of the first pair of cylinders 43, 45 takes place simultaneously with the filling stroke of the second pair of cylinders 44, 46. Due to a higher stroke speed when filling than when dosing, an overlap, ie simultaneous dosing of both cylinders 43, 44 and 45, 46 of one component, is possible in the end positions, which makes completely pulsation-free continuous dosing possible.
  • the size of the bellows In this exemplary embodiment, 47, 48, 49, 50 is essentially determined by the required discharge rate and by the switching duration and the permissible switching frequency of the positively controlled shut-off valves 66, 67, 68, 69 and 70, 71, 72, 73, respectively.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Un dispositif de dosage et de mélange de systèmes à composants fluides multiples comprend comme éléments de déplacement des soufflets (3, 4; 47, 48, 49, 50) agencés chacun dans une chambre cylindrique (1, 2; 43, 44, 45, 46) pour chaque composant et synchronisés de façon à travailler ensemble. Ils divisent chaque chambre cylindrique (1, 2; 43, 44, 45, 46) en une chambre à composant (6, 7; 51, 52, 53, 54) et en une chambre à pression (8, 9; 5, 56, 57, 58), la pression dans les chambres à pression (8, 9; 5, 56, 57, 58) étant toujours presque la même que dans les chambres à composants (6, 7; 51, 52, 53, 54). Les chambres à composants sont reliées chacune par une soupape d'obturation (38, 39; 70, 71, 72, 73) à une chambre de mélange (14) et par une autre soupape d'obturation (10, 11; 66, 67, 68, 69) à un réservoir (12, 13).
EP87902376A 1986-04-08 1987-04-04 Dispositif de dosage et de melange de systemes a composants fluides multiples Expired - Lifetime EP0301016B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87902376T ATE61946T1 (de) 1986-04-08 1987-04-04 Vorrichtung zum dosieren und mischen von fliessfaehigen mehrkomponentensystemen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611728 1986-04-08
DE3611728A DE3611728C1 (de) 1986-04-08 1986-04-08 Vorrichtung zum Dosieren und Mischen von fliessfaehigen Mehrkomponentensystemen

Publications (2)

Publication Number Publication Date
EP0301016A1 true EP0301016A1 (fr) 1989-02-01
EP0301016B1 EP0301016B1 (fr) 1991-03-27

Family

ID=6298193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87902376A Expired - Lifetime EP0301016B1 (fr) 1986-04-08 1987-04-04 Dispositif de dosage et de melange de systemes a composants fluides multiples

Country Status (4)

Country Link
EP (1) EP0301016B1 (fr)
AU (1) AU7232287A (fr)
DE (2) DE3611728C1 (fr)
WO (1) WO1987006154A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771235B1 (fr) * 1994-07-19 2003-02-26 Applied Chemical Solutions, Inc. Appareil et procede s'utilisant dans des modes operatoires de polissage mecano-chimique
DE19618591A1 (de) * 1996-05-09 1997-11-13 Micafil Vakuumtechnik Ag Vorrichtung zum Fördern dosierter Mengen mindestens zweier fliessfähiger Komponenten einer reaktiven Masse
DE19819271A1 (de) * 1998-04-30 1999-11-11 Guenther Kramb Dosiervorrichtung für eine Emulgieranlage
BE1026239B1 (nl) * 2018-04-26 2019-11-26 Soudal Apparaat en werkwijze voor het daarmee produceren en dispenseren van een reactiemengsel

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2788953A (en) * 1954-02-11 1957-04-16 Cayton Inc Automatic proportional metering, mixing, and dispensing system
US3100451A (en) * 1961-01-24 1963-08-13 Alexander S Limpert Proportioning pump
US3524714A (en) * 1968-10-30 1970-08-18 Us Air Force Pneumatic bellows pump
US3836335A (en) * 1973-06-01 1974-09-17 Corning Glass Works Reagent storage and dispensing system
US4060178A (en) * 1974-05-10 1977-11-29 Miller Mfg. Co. Of Schiller Park, Inc. Metering pump
US4132483A (en) * 1975-01-17 1979-01-02 Kimball International, Inc. Molding machine with proportional dispensing
DE2910798C2 (de) * 1979-03-20 1985-05-02 Meinz, Willi, 5100 Aachen Vorrichtung zur Polyurethanverschäumung
DE3128666C2 (de) * 1981-07-20 1984-07-05 Hans Willi 5100 Aachen Meinz Vorrichtung zur Dosierung von Zweikomponentensystemen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8706154A1 *

Also Published As

Publication number Publication date
DE3611728C1 (de) 1987-04-16
AU7232287A (en) 1987-11-09
DE3768952D1 (de) 1991-05-02
EP0301016B1 (fr) 1991-03-27
WO1987006154A1 (fr) 1987-10-22

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