EP0243426A1 - Procede et dispositif de dosage et de melange de deux masses diverses pateuses ou a faible ou forte viscosite - Google Patents

Procede et dispositif de dosage et de melange de deux masses diverses pateuses ou a faible ou forte viscosite

Info

Publication number
EP0243426A1
EP0243426A1 EP86906315A EP86906315A EP0243426A1 EP 0243426 A1 EP0243426 A1 EP 0243426A1 EP 86906315 A EP86906315 A EP 86906315A EP 86906315 A EP86906315 A EP 86906315A EP 0243426 A1 EP0243426 A1 EP 0243426A1
Authority
EP
European Patent Office
Prior art keywords
mixing
masses
mixing chamber
drive shaft
screws
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.)
Pending
Application number
EP86906315A
Other languages
German (de)
English (en)
Inventor
Alfred Jun. Schmid
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.)
Coltene Holding AG
Original Assignee
Coltene AG
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 Coltene AG filed Critical Coltene AG
Publication of EP0243426A1 publication Critical patent/EP0243426A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/426—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix with consecutive casings or screws, e.g. for charging, discharging, mixing
    • 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
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper

Definitions

  • the invention relates to a device and a method for dosing and mixing two different, pasty or low to higher viscous masses, comprising two storage containers for the two masses, a device for simultaneously conveying the masses from the storage containers into a mixing chamber and a device for mixing of the two masses in the mixing chamber, the mixing device and the mixing chamber possibly being designed to be removable as a disposable part.
  • the object of the present invention is to provide an apparatus and a method for mixing and dosing two different masses, the mixing and dosing of the two masses being simpler, i.e. with less mechanical effort, an exact dosing of the two masses is possible, possibly by changing the mixing ratio within desired limits, and the mixing of the two masses takes place under conditions so mild that in the case of thermosetting masses not by supplying too much mechanical energy converted into heat leads to premature hardening of the masses.
  • the device of the type mentioned which is characterized in that the device for conveying and metering the two masses are arranged on a common drive shaft, provided with opposing webs and optionally present in separate housings.
  • the invention further relates to a method for dosing and mixing two different, pasty or low to highly viscous masses, by simultaneously dispensing the masses stored separately in two storage containers into a common mixing chamber, mixing the masses in the mixing chamber and pressing them out of the mixing chamber, whereby this is characterized in that the two masses are introduced in a metering manner into the mixing chamber by means of two screws arranged on a common drive shaft, provided with opposing webs and optionally in separate housings.
  • the advantages of the device according to the invention and the method according to the invention are first of all that only one drive is required to convey and dose the two different masses to be mixed with one another, this drive advantageously also driving the mixing device in addition to the metering device. Since the metering device, ie the screws arranged on a common drive shaft, is only rotated relatively slowly when metering the two masses into the mixing chamber, the mixing device, ie the stirrer, is also only rotated at a slow speed in the mixing chamber, but it should for this reason be specially designed to enable mixing even at a relatively low stirring speed, as a result of which excessive heating due to the destruction of the mechanical stirring energy supplied is reliably prevented from premature curing in the case of mutually reactive compositions.
  • a further advantage of the device and the method according to the invention is therein see that not only with pasty masses, but also with viscous masses, ie viscous masses, for example with the consistency of viscous honey, can still be dosed perfectly in precisely controlled mixing ratios, i.e. a mixing ratio of 1: 1 in volume can also exactly with such viscous or viscous masses.
  • Another advantage of the device according to the invention and the method according to the invention can be seen in the fact that simple cartridges can be used as storage containers for the two different masses, optionally with a spring-loaded plunger movable therein or with a vented screw cap.
  • Another advantage is that because of the precise metering by the two screws arranged on a drive shaft, no particularly high pressure has to be exerted on the storage containers, so that the storage containers can consist of inexpensive materials, since they are not deformed when the device according to the invention is used .
  • an automatic shut-off device is provided in the passage from the screw housing to the mixing chamber in order to prevent the to avoid flowable masses under gravity in the mixing chamber in the long run.
  • a shut-off device can be, for example, a spring-loaded ball or plate arranged in a suitable seat.
  • the dosage ratio of the two masses can be varied within wide limits, e.g. from 1:20 to 20: 1. However, the dosage ratio is usually 1: 1 to 1:10, e.g. with hardening masses.
  • the metering ratio can be set once by using screws with webs arranged with different pitches or screws with different depths of the screw flights, according to an advantageous
  • Embodiments are provided for setting the dosing ratio, in particular for fine adjustment of the dosing ratio, control elements such as adjusting screws or valves in the feed channels for the masses from the screw housing to the mixing chamber.
  • the feed channels for the two different masses to the mixing chamber can have different diameters, either in order to adapt to the viscosity of the two masses, which can be the same or different, or in the case of mixing ratios which differ from 1: 1 to allow the masses to pass properly into the mixing chamber.
  • the drive of the two screws is on the common one
  • Mixing device is rotated relatively slowly.
  • This drive can either be operated manually, for example by means of a crank, or the drive can also be carried out by means of a motor, preferably an electric motor, in which case a suitably reduced gear can be arranged between the motor and the drive shaft.
  • the rotational speed of the drive shaft can be regulated by suitable control elements and, if necessary, also measured and, if desired, displayed.
  • an advantage of the mixing device according to the invention is that in the
  • Heating in the mixing chamber is avoided so that the mass does not harden prematurely, ie in order to achieve a sufficiently long pot life.
  • a catalyst there is a chemical reaction between reactive group-containing monomers or incompletely converted oligomers or polymers and another component.
  • Such systems are sensitive to the addition of catalyst and require particularly precise maintenance of the mixing ratio of the two components, which could result in metering problems. In such systems, however, mixing should also take place quickly, homogeneously and also free of bubbles.
  • the stirrer In order to achieve this perfect mixing at a relatively low rotational speed of the mixing device, ie a stirrer, the stirrer according to a preferred embodiment consists of a stripping stirrer which abuts the walls of the mixing chamber and strips off adhering masses and, through its shape, into the center of the mixing chamber promoted.
  • vanes which are statically fastened in the mixing chamber are also present and which are more attached to the center of the mixing chamber.
  • these blades are also fastened to the rotating mixing device and have such a shape that the mass to be mixed and stripped by the wipers from the mixing chamber wall are kneaded together, so to speak, in the inner part of the mixing chamber, so that this central one too Zone of the mixing chamber is used as a mixing zone.
  • these embodiments there is a mixing of the masses possible, in which the mix experiences maximum turbulence with as little energy loss as possible due to internal friction, without too fast rotation of a conventional stirrer generating excessive internal friction, which could lead to premature hardening of the mass or the output quantity by lowering the flow resistance , if the mixed mass becomes thinner due to the added heat, could be increased.
  • the mixing device ie the mixing tool
  • the turbulence should be increased as much as possible, even at a low rotational speed of the mixing device, in such a way that material conveyance to the center is supported, with material return possibly also taking place against the general flow direction of the mass in the mixing chamber.
  • an optimal ratio of the mixing movements to the quantity conveyed can be set. It goes without saying that the rotational speed of the screws on the one hand and the rotational speed of the mixing device on the other hand do not have to be the same, but can also be in a predetermined relationship to one another by means of a mechanical coupling known per se.
  • the mixing chamber and the mixing device are advantageously designed as a disposable part, in particular this is necessary in the case of masses reacting with one another, since the remnants of the masses mixed with one another harden in the mixing chamber and mixing device and reuse of the mixing device into one would not be possible later after curing.
  • the mixing device with the help of an easy-to-solve attachment, for. B. attached by means of a bayonet lock, as described in the aforementioned EP 0 087 029.
  • the stirring device is detachable-attached to the drive shaft, z. B. by plugging onto a square shaft.
  • a suitable seal e.g. B. be attached by means of an O-ring.
  • the fit can also be designed such that the seal is self-sufficient.
  • a seal, for. B. provided by means of an O-ring.
  • this hand crank is non-positively coupled to the drive shaft such that this drive shaft can only be rotated in one direction, namely in the direction in which the metering and mixing of the two Masses are done. This avoids that already mixed mass is sucked back into the feed channels by accidental or unintentional turning backwards of the hand crank, whereby in the case of curable mass a hardening and thus a blockage in the feed channels could be brought about.
  • the hand crank is non-positively connected to the drive shaft via a device acting as a freewheel, so that the hand crank, if it is not in a position with the lowest center of gravity after the end of a metering and mixing process, automatically in this position with the lowest center of gravity passes, ie is not rotated backwards by gravity.
  • the mixing chamber is provided with cams which engage in the coupling bayonet for attachment to the mixing device, as a result of which the mixing chamber is prevented from rotating during the mixing process.
  • the mixing chamber is arranged with an inclination of the outlet opening downwards, which inclination can be 15 ° to 40 °. This has the advantage that, for example, a vessel or a spoon can be filled more easily with the mixed mass.
  • the mixing chamber has an attachment at the outlet end, on which, for. B. a syringe to be filled with the mixed mass, can be attached.
  • a syringe to be filled with the mixed mass can be attached.
  • the storage containers for the two to be dosed and ver mixing masses of cartridges that are sealed until use.
  • Such cartridges can have a closed approach for placement on the device, which is opened before placement, e.g. B. by cutting, also at the other end a movable, acting as a piston cap, which is automatically pulled down when removing mass from the cartridge when the device is actuated.
  • the mixing device is provided with further wipers which wipe the two different masses emerging from the two feed channels of the cold part from this holding part and also directly at the outflow openings, i. H. rest on the holding part, so that when the mixing device rotates and this stripping takes place, the two masses are mixed immediately.
  • the mixing device consists of cams which are formed on a tube which is closed on one side, this closed tube with the cams and the aforementioned wipers being particularly advantageous and intensive over relatively short distances for the masses emerging from the feed channels Mixing of the two masses results, and allows a small dead space between the mixing chamber and the mixing device.
  • the mixing device also carries wipers at the end facing the outflow opening of the mixing chamber, as a result of which the mixture of the mass can be more easily pressed out of the mixing chamber.
  • the wipers which abut the holding part and sweep over the two feed channels on the holding part, are “propeller-like”, so that this further promotes the masses to be mixed through the mixing chamber.
  • This has the advantage that the conveying force to be applied by the two screws is reduced by such "propeller-shaped" wipers. This can be achieved in that the
  • the wipers provided at the outlet end of the mixing chamber can be “propeller-like”, that is to say arranged at an angle to the longitudinal axis of the mixing chamber.
  • the device can be processed from values of approximately 20,000 cps for low-viscosity compositions to values of approximately 10 6 cps for higher-viscosity compositions, the viscosity values being measured with a Brookfield viscometer at 23 ° C.
  • FIG. 2 shows a cross section through FIG. 1, the central regions of FIG. 1 being shown as a whole for clarification, i.e. in different cutting planes;
  • FIG. 4 the mixing device shown in FIG. 3 in section within a mixing chamber
  • the mixing device and the mixing chamber are inclined downwards at 30, the mixing chamber has an attachment for fitting a syringe and has cams to prevent the mixing chamber from rotating.
  • FIG. 7 shows a further embodiment in which the hand crank is coupled to the drive shaft by means of a freewheel and the storage container bears a cap as a closure;
  • FIG. 8 shows an embodiment of the mixing device in which there are wipers abutting the holding part and wipers abutting the outflow end of the mixing chamber;
  • Fig. 9 in an enlarged view the propeller-shaped 'configuration of the wipers, which rest on the holding part and the outflow end.
  • the device according to the invention is shown in supervision from the front.
  • the two housings 4, 5 there are the two screws 6, 7 on the drive shaft 1, which are provided with opposing webs 2, 3.
  • the two housings 4, 5 are made from one part.
  • the seal 8 which is shown in the upper part as a lip seal 8, while in the lower part of FIG. 1 this seal is shown as an O-ring 9.
  • the two storage containers 20, 21 for the two different masses to be metered and mixed are located on the two housings 4, 5.
  • the screws 6, 7 have screw cores that rise, ie, conically increase in the direction of conveyance, as a result of which the delivery rate is given.
  • the mixing chamber 12 is removable, ie is designed as a disposable part, as will be described in more detail with reference to FIG. 2.
  • the mixing chamber 12 is carried by the holding part 22, in which the feed channels 10, 11 are also partially formed. With 17 the mixing device is designated.
  • FIG. 2 shows a section approximately through the center of the device according to FIG. 1, several levels being shown here in order to reproduce all the details.
  • the supply channels 10, 11 lead from the housings 4, 5 into the holding part 22 for the mixing chamber 12 and the mixing device 17.
  • a gear wheel 15 is located on the drive shaft 1 outside the housing 4, which meshes with the gear wheel 16 and drives the shaft 23.
  • the bevel gear 24, which is in engagement with the bevel gear 25, is located on this shaft 23.
  • the shaft 26 is driven via the bevel gear 25 to drive the mixing device, which is not shown in FIG. 2 for the sake of clarity.
  • the free end of the shaft 26 is designed as a square on which the mixing device 17 can be attached.
  • the mixing chamber 12, which advantageously consists of plastic, has the outflow opening 27.
  • FIG. 3 shows an embodiment of a mixing device 17.
  • This has the recess 28 into which the free end of the shaft 26 is inserted when plugged on.
  • the mixing device 17 also has lateral cutouts 29 and 30, which are each offset from one another.
  • the mixing device 17 has dimensions such that it can be inserted straight into the mixing chamber 12, ie that the gap between the parts of the mixing device 17 projecting outwards and the inner wall of the mixing chamber 12 is as small as possible.
  • the mixing device 17 of FIGS. 3 and 4, FIG. 4 being a section through the embodiment shown in FIG. 3, also has vanes 19 arranged in the center, which in the embodiment shown are arranged obliquely to the axis of rotation and intimate mixing of the masses even in the central zones within ensure the mixing chamber. 4, the mixing chamber 12 is also shown.
  • FIG. 5 shows a further embodiment of a mixing device 17 in a mixing chamber 12, wipers 18 being provided on the outer edges of the mixing device 17, which wipe the masses off the inner wall of the mixing chamber 12.
  • the direction of rotation is shown by an arrow.
  • FIG. 6 which essentially corresponds to the arrangement according to FIG. 2, the mixing device 17, the holding part 22 and the mixing chamber 12 are inclined downwards at about 30 degrees. This is achieved in that the housings 4 and 5 have a trapezoidal cross section. Furthermore, the mixing chamber has at its outflow opening 27 an extension 31, on which a syringe or a hose can be placed to hold the mixed mass.
  • FIG. 6 also shows the embodiment in which twisting or rotation of the mixing chamber 12 during the mixing process is avoided by the fact that the mixing chamber has cams 33 which cut into corresponding sections of a - not shown in FIG. 6 - Bayonet nut can come into engagement.
  • FIG. 7 shows the embodiment with a hand crank and freewheel.
  • the crank handle 34 fastened on the drive shaft 1 drives the gear wheel 15, which has suitable circular cutouts 40 into which the ball 39 movable in the oblique cage-like part 35 can come into engagement.
  • This is turning the hand crank 34 is only possible in one direction, because when the hand crank 34 rotates in the opposite direction, that is to say when it rotates backwards, the ball 39 engages in the depression 40 and the ball 39 runs up on the inclined plane of the cage-like part 35 to block such a backward movement is effected.
  • another freewheel device e.g. B. a ratchet mechanism can be provided.
  • FIG. 7 also shows the embodiment of the device in which the storage container has the shape of a cartridge 36, this cartridge 36 being attached to the housing 4 by means of an attachment on the lower part 38, for. B. screwed on, and the cartridge is closed from the atmosphere by means of a cover 37 slidably arranged in the cartridge 36.
  • the supply of the device according to the invention with the two masses to be metered and mixed is particularly easy to achieve.
  • the mixing device 17 is formed from a closed tube 42, which is closed at the end facing the outflow opening 27.
  • the other end of this tube has e.g. a square, so that it can be plugged onto the free end of the shaft 26.
  • This closed tube 42 has cams 43.
  • the free space between the mixing chamber 12 and the mixing device 17 in the form of the tube 42 with the cams 43 is relatively small, so that the losses in mixed masses are relatively small.
  • the mixed mass which is located in this dead space between the mixing chamber 12 and the closed tube 42, hardens and is also discarded when the mixing device and mixing chamber, which is designed as a disposable part, is changed, i.e. is lost.
  • this dead space is as small as possible.
  • the wipers 45 provided at the outlet end 46 likewise bring about a further reduction in this dead space.
  • the wipers 41 and 46 of the mixing device 17, which is in the form of a closed tube 42, are “propeller-like”, ie these wipers are arranged obliquely with respect to the direction of the shaft 26, so that when the Mixing device 17 and thus also the scraper 41, the masses emerging from the feed channels 10 and 11 are moved in the direction of the outflow opening 27. This is done a relief of the delivery force to be exerted by the screws 8, 9 or the delivery pressure, by means of which the masses are ultimately also pressed out of the outlet opening 27.
  • a further support of this conveying effect is achieved in that the wipers 45 at the outlet end 46 of the mixing chamber 12 are also "propeller-like", ie also have a previously mentioned inclined surface, so that the conveying of the finished mixture from the outlet opening 27 is supported.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

Un dispositif de dosage et de mélange de deux masses diverses pâteuses ou à faible ou forte viscosité comprend deux réservoirs pour les deux masses, un dispositif de transport simultané des deux masses des réservoirs à une chambre de mélange et un dispositif de mélange des deux masses dans la chambre de mélange. Le dispositif et la chambre de mélange sont éventuellement amovibles et jetables. L'invention se caractérise par le fait que les dispositifs de transport et de dosage des deux masses sont des vis sans fin (6, 7) pourvues de nervures opposées (2, 3) et agencées sur un même arbre moteur (2, 3), éventuellement dans des carters séparés (4, 5).
EP86906315A 1985-10-21 1986-10-20 Procede et dispositif de dosage et de melange de deux masses diverses pateuses ou a faible ou forte viscosite Pending EP0243426A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853537381 DE3537381A1 (de) 1985-10-21 1985-10-21 Vorrichtung und verfahren zum dosieren und mischen von zwei unterschiedlichen, pastoesen oder niedrig oder hoeher viskosen massen
DE3537381 1985-10-21

Publications (1)

Publication Number Publication Date
EP0243426A1 true EP0243426A1 (fr) 1987-11-04

Family

ID=6284058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86906315A Pending EP0243426A1 (fr) 1985-10-21 1986-10-20 Procede et dispositif de dosage et de melange de deux masses diverses pateuses ou a faible ou forte viscosite

Country Status (4)

Country Link
US (1) US4759633A (fr)
EP (1) EP0243426A1 (fr)
DE (1) DE3537381A1 (fr)
WO (1) WO1987002271A1 (fr)

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ATE543563T1 (de) 2008-07-11 2012-02-15 Vervant Ltd Mischgerät zur bereitstellung von additiven beispielsweise für einen kunststoffextruder
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Also Published As

Publication number Publication date
DE3537381C2 (fr) 1988-06-23
DE3537381A1 (de) 1986-05-22
WO1987002271A1 (fr) 1987-04-23
US4759633A (en) 1988-07-26

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