EP0101255B1 - Mischer - Google Patents

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Publication number
EP0101255B1
EP0101255B1 EP83304499A EP83304499A EP0101255B1 EP 0101255 B1 EP0101255 B1 EP 0101255B1 EP 83304499 A EP83304499 A EP 83304499A EP 83304499 A EP83304499 A EP 83304499A EP 0101255 B1 EP0101255 B1 EP 0101255B1
Authority
EP
European Patent Office
Prior art keywords
rotary platform
rim
machine according
platform
concave
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.)
Expired
Application number
EP83304499A
Other languages
English (en)
French (fr)
Other versions
EP0101255A2 (de
EP0101255A3 (en
Inventor
Stuart Pugh
Michael Edward Preston
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.)
CROKER Ltd
Original Assignee
CROKER Ltd
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 CROKER Ltd filed Critical CROKER Ltd
Publication of EP0101255A2 publication Critical patent/EP0101255A2/de
Publication of EP0101255A3 publication Critical patent/EP0101255A3/en
Application granted granted Critical
Publication of EP0101255B1 publication Critical patent/EP0101255B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/80—Mixers with rotating receptacles rotating about a substantially vertical axis
    • B01F29/82—Mixers with rotating receptacles rotating about a substantially vertical axis the receptacle comprising a rotary part, e.g. the bottom, and a stationary part, e.g. the wall, with optional use of a stirrer; the receptacle comprising parts moving in opposite directions

Definitions

  • the present invention relates to a mixing machine in which a rotor in the form of a circular rotary platform cooperates with a stator in the form of a stationary wall which encircles the periphery of the rotor and extends above its rim.
  • a rotor in the form of a circular rotary platform cooperates with a stator in the form of a stationary wall which encircles the periphery of the rotor and extends above its rim.
  • materials to be mixed are flung centrifugally outwards and upwards by the rotor against the stator which deflects the materials inwards again onto the platform so that the materials to be mixed are formed into a moving toroidal mass extending around the platform with individual particles of the mixture travelling helically around the toroid.
  • a mixing machine that operates on the above mentioned principle has been described by Milik-see UK Patent Specification No. 1365685 (assigned to Evans and Ryder). The use of that machine has been described by the same inventor in relation to fibrous materials (Patent Specification No. 1365686), granular materials having a density below 70 Ib per cubic foot which is less than the normal density of concrete (Patent Specification No. 1375943) and for the treatment of seed (Patent Specification No. 1417694).
  • the stator part of the machine is a substantially vertically directed stationary wall that surrounds and extends directly upwards from the rim of the rotor with an obtuse sharply defined angle between the wall and the rim of the platform.
  • the mixer described by Milik is difficult to use for the mixing of concrete in which water has to be mixed with - non-homogeneous mixture of particles ranging in size from very fine particles of cement to particles of gravel and coarse aggregates that are retained by a 5 mm mesh BS sieve.
  • the blend of water or other liquid with such a complex mixture of particles is liable to adhere to the inner surface of the stator at or adjacent to sharp angulations to build up a static boundary layer with the result that complete and uniform mixing is not achieved and the mixing operation may have to be prematurely discontinued.
  • sharp angulations in the circulation path of the particles being mixed result in high rates of inter-particle impact and damage to the particles being mixed.
  • the present invention is based on the realisation that more satisfactory results are obtained by using a stator having a concave curved inner face to which the rim of the rotor is tangential. With such an arrangement the particles to be mixed are positively guided along an appropriate toroidal path and there is no sharp angulation giving rise to a dead space for slow moving particles that could promote static boundary layer formation. Uniform mixing can be achieved very rapidly without build up of an unacceptable layer of incompletely mixed material at the stator wall and with a minimum of particle damage and with minimum energy consumption.
  • the invention provides a mixing machine comprising a dished circular rotary platform that is smoothly curved towards an upwardly and outwardly inclined rim, and a concave stationary wall which closely surrounds and extends upwardly from the rim of the rotary platform characterized in that:
  • Swiss Patent No. 455555 shows a mixer in which a generally toroidal circulation is produced by a deeply dished rotary platform in combination with a static lid having a curved surface defining the remainder of a closed toroidal space for material circulation. But Meier's mixer requires the lid to maintain a closed circulation path whereas in the present invention it is the concave part toroidal surface acting as a sidewall that produces' the toroidal circulation independent of the presence of a lid.
  • a mixing machine comprises a dished rotor a that is rotated by suitable drive means in the direction of arrow b. Its top face is smoothly curved towards its rim and although such smooth curvature is not essential and may be undesirable at its centre, the intermediate and rim regions should be smoothly curved and devoid of sharp angularities if damge to the material being mixed is to be avoided. It is important that there should be sufficient friction between the rotor and the material being mixed to drive the mix across the gap between the rotor a and the stator c.
  • the transfer of momentum may be improved by providing radially directed drive bars d ( Figure 2) at equal angular intervals around the rim of the rotor and for example there may be six such drive bars disposed at 60° intervals.
  • the top face of the rotor may also be coated with a plastics material such as a polyurethane. If the rotor is covered with Linatex, however, which is a hard wearing rubber material having good wet friction properties, there may be no need to use drive-off bars.
  • the stator c is formed with a concave inner face as shown that may be provided with a plurality of "breaker bars" e also disposed at equal angular intervals about the axis of rotation of the rotor a.
  • breaker bars In the absence of breaker bars the particles in the material being mixed follow generally circular rather than toroidal paths, and there is a tendency for material to adhere to the upper region of the curved part of the stator.
  • the function of the breaker bars which are vertically directed and made of steel or other wear-resistant material is to prevent material sticking to the stator and to encourage development of a toroidal circulation pattern.
  • stator and rotor together define a smoothly curved surface with only a small gap between them: Lo.ssof fine - material can be prevented-by directing an upward current of air f through the gap at a pressure of typically less than 172 kN/m 2 at a flow rate of 1.5 m 3 /min.
  • This is in relation to a production size mixer of overall diameter 1.0 metre.
  • the radius of curvature of the part-toroidal inner face of the stator which is circular in profile ranges typically from 0.127 metre to 0.203 metre, the size being selected to give the desired mixing capacity.
  • S represents the diameter of the vertical circle of which the-concave inner face of the stator (c) is an arc and D represents the furthest distance from the axis of the platform (a) to the inner face of the stator (c).
  • a motor 1 drives rotor 13 through gearbox 2 via a shaft 9 that is covered by a domed cover 27.
  • the rotor 13 cooperates with a dished stator 21 as previously described.
  • a compressor 3 that discharges air through pipe 20 to the space beneath rotor 13. Air flows upwards into a chamber 30 defined between a false floor the rotor 13 and the walls of the housing of the machine and thence upwards under appropriate pressure between the rotor 13 and the stator 21.
  • Portions of the upper part of the housing define a hinged discharge door 12 for mixed cement that may be opened and closed by means of a piston and cylinder device 4, 6 to permit the contents of the mixer to be discharged when required.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Claims (5)

1. Mischmaschine mit einer runden Drehschale (a), die zu einem, auf- und auswärts ansteigenden Randbereich hin sanft gebogen ist, und einer feststehenden konkaven Wandung (c), die den Randbereich der Drehschale eng umgibt und sich davon aufwärts erstreckt, dadurch gekennzeichnet, daß die Drehschale (a) die Form einer flachen Schale aufweist und daß die feststehende Wandung (c) eine konkave teil-toroidale Außenfläche aufweist, die durch Rotieren eines im allgemeinen vertikalen Bogensegmentes um die Rotationsachse der Drehschale definiert ist, wobei der Randbereich der Drehschale tangential zu der konkaven Außenfläche verläuft und die konkave Außenfläche einen kleineren Kurvenradius als die Schale aufweist.
2. Mischmaschine nach Anspruch 1, dadurch gekennzeichnet, daß auf die Drehschale (a) ein hoch gegenüber Naßreibung verschließfestes Material aufgebracht ist.
3. Mischmaschine nach Anspruch 1 oder 2, in der vertikal gerichtetete Streben (e) auf der inneren Fläche der feststehenden Wandung (c) angeordnet sind, um eine toroidale Zirkulation zu unterstützen und einen Aufbau einer statischen Grenzschicht zu verhindern.
4. Mischmaschine nach einem der vorangehenden Ansprüche, in der ein Kompressor angeordnet ist, um Gas (f) unter Druck in eine geschlossene Kammer einzublasen, die durch Bereiche eines Maschinengehäuses unterhalb der Drehschale (a) gebildet ist, wodurch der Durchtritt von Gas nach oben durch die ringförmige Lücke zwischen der Drehschale (a) und der Wandung (c) dem Durchtritt von Material, das gemischt wird, dort hindurch entgegenwirkt.
5. Mischmaschine nach einem der vorangehenden Ansprüche, in der die Drehschale eine erhabene Zone aufweist, die sich mit der Rotationsachse der Drehschel deckt um einen örtlichen Aufbau von Material zu unterbinden.
EP83304499A 1982-08-05 1983-08-04 Mischer Expired EP0101255B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8222636 1982-08-05
GB08222636A GB2125307B (en) 1982-08-05 1982-08-05 Improvements in mixing machines

Publications (3)

Publication Number Publication Date
EP0101255A2 EP0101255A2 (de) 1984-02-22
EP0101255A3 EP0101255A3 (en) 1984-07-25
EP0101255B1 true EP0101255B1 (de) 1986-11-26

Family

ID=10532137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304499A Expired EP0101255B1 (de) 1982-08-05 1983-08-04 Mischer

Country Status (4)

Country Link
EP (1) EP0101255B1 (de)
DE (1) DE3367865D1 (de)
DK (1) DK355883A (de)
GB (1) GB2125307B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3604619A1 (de) * 1986-02-14 1987-08-20 Spaleck Gmbh Max Fliehkraftbearbeitungsmaschine
US4828396A (en) * 1987-12-02 1989-05-09 The Nutrasweet Company Fluid processor apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1454743B2 (de) * 1962-06-07 1970-05-14 Beck, Erich, 6520 Worms Verfahren und Vorrichtung zum Verdichten und Agglomerieren von pulverförmigen bis körnigen thermoplastischen Stoffen
CH455555A (de) * 1967-09-09 1968-07-15 Meier Kurt Verfahren zum Waschen, Scheuern, Entgraten, Polieren oder Mischen von Bearbeitungsgut sowie Vorrichtung zur Ausübung des Verfahrens
FR2052018A5 (de) * 1969-07-04 1971-04-09 Moritz Jean
GB1365685A (en) * 1971-02-09 1974-09-04 Evans T G Mixing machines
DE2202185A1 (de) * 1972-01-15 1973-07-26 Wey Gino Dipl Ing Verfahren und einrichtung zum mischen von feststoff- und fluessigkeitsteilchen vorzugsweise zement mit wasser
US3751011A (en) * 1972-01-24 1973-08-07 Design Link Mixing of particulate and fibrous materials
US4408417A (en) * 1980-10-31 1983-10-11 Shikishima Tipton Mfg. Co., Ltd. Fully automatic barrel finishing machine

Also Published As

Publication number Publication date
GB2125307A (en) 1984-03-07
GB2125307B (en) 1985-10-23
DK355883D0 (da) 1983-08-04
EP0101255A2 (de) 1984-02-22
DE3367865D1 (en) 1987-01-15
EP0101255A3 (en) 1984-07-25
DK355883A (da) 1984-02-06

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