WO1984003451A1 - Procede et melangeur pour melanger continuellement un produit fin et sec, en particulier un materiau synthetique pulverulent ou granuleux - Google Patents

Procede et melangeur pour melanger continuellement un produit fin et sec, en particulier un materiau synthetique pulverulent ou granuleux Download PDF

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Publication number
WO1984003451A1
WO1984003451A1 PCT/EP1984/000068 EP8400068W WO8403451A1 WO 1984003451 A1 WO1984003451 A1 WO 1984003451A1 EP 8400068 W EP8400068 W EP 8400068W WO 8403451 A1 WO8403451 A1 WO 8403451A1
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WO
WIPO (PCT)
Prior art keywords
container
outlet opening
mixing
peripheral wall
fine material
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.)
Ceased
Application number
PCT/EP1984/000068
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German (de)
English (en)
Inventor
Friedrich Walter Herfeld
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
Publication of WO1984003451A1 publication Critical patent/WO1984003451A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/582—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/82—Pan-type mixers, i.e. mixers in which the stirring elements move along the bottom of a pan-shaped receptacle
    • 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
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/32—Driving arrangements
    • B01F35/321—Disposition of the drive
    • B01F35/3213—Disposition of the drive at the lower side of the axis, e.g. driving the stirrer from the bottom of a receptacle
    • 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
    • B01F35/75—Discharge mechanisms

Definitions

  • the invention relates to a process for the continuous mixing of dry fines, in particular powdery and granular plastic, in a mixer with an approximately upright mixing container, to which the fines are fed from above and drawn off at the bottom through a material outlet opening and in which the fines are removed by means of an approximately vertical, centric, rotating driven agitator shaft with mixing tools attached to it.
  • Fer ner the invention is concerned with a mixer for performing this method.
  • the fine material to be mixed is fed with the aid of a centrally arranged feed pipe which dips into the mixed material until just above the bottom of the container and into the immediate area of the mixing tools.
  • the fine material is then to be kept in a flowing state within the container so that it can be drawn off with the aid of an overflow pipe which protrudes obliquely through the container circumferential edge into the container interior and whose open end, which can be adjusted approximately in a medium height position, forms the material outlet opening.
  • the fine material filling in the mixing container is to be maintained up to a filling level determined by said outlet opening.
  • Fine material components are fed to the mixing container from above with the aid of metering screws, while the mixed material is drawn off via an outlet opening provided at the lower end of the cylindrical peripheral wall of the container, which is assigned a discharge screw running radially to the container.
  • the removal capacity of the screw conveyor assigned to the outlet opening must be precisely matched to the feed capacity of the various screw conveyors for the inlet components, quite apart from the considerable design effort for these screw conveyors.
  • the invention has for its object to provide a method of the type mentioned, in which the continuous mixing of fine material with ver relatively simple constructive means and in this way throughput and mixing times which can be changed quickly at any time.
  • a definable partial filling quantity is thus first created in the mixing container, which is essentially determined by the rotational speed or the peripheral speed of the mixing tools and by the position of the material outlet opening (seen in the radial direction in the container bottom) and by which the dwell time of the Fine material in the mixer or in the mixing container results. Only when this partial filling quantity is filled above the outer ring surface mentioned does the emptying of already mixed fine material begin, and - with the circumferential speed of the mixing tools remaining the same - exactly in line with the fine material quantity that flows into the mixing container from above.
  • Cross-sectional profile of the partial filling quantity mentioned and thus change the throughput time or mixing time of the fine material within the mixing container, so this can be done in a very simple manner by either increasing the peripheral speed of the mixing tools and thereby making the space above the outer base ring surface stronger with material is filled, or the peripheral speed of the mixing tools is reduced, as a result of which - due to the resulting lower centrifugal force acting on the material to be mixed - a correspondingly smaller partial filling quantity accumulates in the space above the outer longitudinal surface of the floor.
  • a continuously operating mixer for carrying out the method according to the invention, which has a mixing container, a driven agitator shaft which is arranged centrally and approximately vertically therein, and which is carried by this agitator shaft with a small amount
  • the material outlet opening is arranged at a radial distance from the peripheral wall of the container in the container bottom, this container bottom between the outer edge of the material outlet opening and the peripheral wall of the container has an annular surface, and that the agitator shaft has a variable rotary drive in such a way that the mixing tools have an outlet of the mixed Fine goods controlling peripheral speed can be driven.
  • FIG. 1 shows a vertical sectional view (approximately along the line I-I in FIG. 2) of an embodiment of the continuously operating mixer for carrying out the mixing process;
  • FIG. 2 shows a plan view of the mixer shown in FIG. 1 with the upper part of the container removed (cf. line II-II in FIG. 1);
  • FIG. 3 shows a very schematic cross-sectional view (similar to FIG. 1) through the
  • Mixing container for explaining different level profiles of the fine material during the mixing process; 4 shows a variant of FIG. 2.
  • the illustrated mixer 1 has an approximately upright mixing container 2, the upper part 2a of which is in the form of a truncated cone-shaped hood and the lower part 2b of which is cylindrical. Above is the mixing container 2 from a container ceiling
  • This container can - as indicated at 3 - be designed so that the upper part 2a can be removed from the lower part 2b.
  • the container 2 can still be surrounded in a conventional manner by a double wall 4 at a distance, so that, for example, water and / or air can be introduced into the resulting cooling jacket (cavity) 5 by means of a pump or a blower 6.
  • a material inlet nozzle 7 is arranged centrally, through which the main component of the fine material or the entire fine material can be introduced into the interior of the container.
  • at least one further inlet connection for an additional component or the like can be provided in the container ceiling 2c.
  • the container bottom 2d in the illustrated embodiment there is one
  • Good outlet opening 9 is provided for the continuous removal of mixed fine material during the mixing process, and in addition there is an additional outlet opening 10 for the total outlet of mixed fine material from the container 2 in the area of the container peripheral wall 2b '/ container base 2d, preferably on the outer peripheral edge of the container base 2d provided, this total outlet opening 10 is only opened for complete emptying or for cleaning the container 2.
  • the position of the material outlet opening 9 in the floor 2d is now of importance.
  • An agitator shaft 12 is arranged centrally and approximately vertically within the mixing container 2 with a circular cross section, which preferably projects from below into the mixing container 2 and extends with its upper free end to the vicinity of the centrally arranged material inlet nozzle 7 (or its opening 7a) and is formed there in the form of a conical distributor.
  • the agitator shaft end 12b protruding from the bottom of the container 2d is connected to a rotary drive 13, by means of which the agitator shaft 12 can be driven at a speed that can be varied in steps.
  • Mixing tools are carried by the agitator shaft 12, which are rotatably connected to it and are formed by at least two upright mixing blades 14.
  • the radially outer free ends 14a of the two mixing blades 14 are - in the direction of rotation
  • the mixing wing 14 may be arranged radially on the agitator shaft 12 or in the container 2; in the illustrated embodiment, however, it is preferred to fix the main parts of the mixing blades 14 approximately tangentially to the agitator shaft 12. In any case, however, the mixing blades 14 extend at a short distance from the container base 2d to in the immediate vicinity (with a small distance) of the peripheral wall 2b 'of the container, so that the entire container cross-section can be coated by these mixing tools in the base region, corresponding to the height of the mixing blades 14 .
  • each outlet opening 9 and 10 is assigned a shut-off device, for example in the form of a shut-off slide valve 19 for the product outlet opening 9 and a shut-off valve valve 19a for the total outlet opening 10, each shut-off valve valve 19, 19a having its own slide valve drive (indicated at 20 in FIG. 1).
  • the gate valve 19 should be controllable via its drive - pneumatically, hydraulically or electrically - in such a way that the passage cross-section of this material outlet opening 9 can be adjusted continuously from 0 to 100%, whereby this gate valve 19 not only has a purely opening and closing function, but can also be used as an adjustable dosing device for the fine material that is running out.
  • this gate valve 19 not only has a purely opening and closing function, but can also be used as an adjustable dosing device for the fine material that is running out.
  • the rotary drive 13 for the agitator shaft 12 should be designed such that the peripheral speed of the mixing blades 14 in the central annular region 21 of the container base 2d containing the product outlet opening 9 is between about 5 and 50 m / s, so that the discharge of the mixed fine material - as will be explained - can be controlled in the desired manner by a corresponding change in this peripheral speed.
  • the fines to be mixed are fed from above through the inlet spout 7 when the agitator shaft 12 is driven in rotation. Due to the rotational movement of the agitator shaft 12 and the mixing blades 14 attached to it, a centrifugal force is exerted on the supplied and falling fine material particles, by means of which the supplied fine material outwards in the direction of the container circumference wall 2b 'is thrown and in the space above the outer bottom ring surface 11 increasingly fills a partial filling quantity from bottom to top and from the peripheral wall area radially inwards to the imaginary circular ring area 21, on the latter
  • Container 2 then increases the fill level profile above the container base 2d in the radial direction inward, so that, for example, the hatched fill level profile B sets in, in which the proportion of mixed material located on the inner peripheral edge extends into the central container base circular region 21, in which also the material outlet opening 9 is located, whereby the portion of the mixed fine material which is moved in each case via the material outlet opening 9 - assuming that the material outlet opening 9 is completely open - can drop down into the outlet nozzle 16.
  • the fine material feed quantity can be increased through the inlet nozzle 7 and secondly the rotational speed of the agitator shaft 12 and thus the peripheral speed of the mixing blades 14 can be reduced, so that the hatched fill level profile indicated by C is obtained, in which essentially the entire central circular ring bottom 21 of the container bottom is covered with mixing fine material, so that a maximum throughput quantity of mixed fine material can run downwards * continuously from the material outlet opening 9.
  • the fill level profile C in which not only the outer base ring surface 11, but also the central annular surface 21 is covered with mixing fine material, can be seen in the illustration in FIG.
  • the partial filling quantity above the outer base ring surface 11 has a smaller volume than in the previously described level profiles A and B. This is due to the reduced peripheral speed of the mixing blades 14 and means a shorter throughput or mixing time of the introduced fingers.
  • an increase in the partial filling volume volume above the outer base ring surface 11 can be achieved if the peripheral speed of the mixing blades 14 is increased accordingly again. As soon as the partial filling quantity has increased, mixed fine material with maximum throughput continues to flow out without the incoming quantity of the fine material having been increased.
  • the mixing time i.e. the dwell time of the fine material to be mixed in the mixer 1
  • the mixing time in an extremely simple manner by changing the peripheral speed of the mixing blades 14 (via a corresponding change in the rotational speed of the agitator shaft 12) and So that a change in the partial filling quantity and the throughput can be controlled via a change in the fine material feed quantity through the inlet nozzle 7.
  • the mixing blades 14 In addition to the two parameters for the mixing duration and throughput quantity mentioned above, there is one more, namely the height of the mixing blades 14 rotating upright in the mixing container 2.
  • the above-described options for changing the mixing duration and throughput quantity always apply to a constant height of the mixing blades 14. Basically, can can be said that the mixing blades 14 have an approximately constant height over most of their radial length, which only decreases at the blade ends 14a (cf. bevels according to FIGS. 1 and 3).
  • the gel height should be such that, at the selectable peripheral speeds for the mixing blades 14, the falling movement of the fine particles is only influenced to such an extent that, on the one hand, a sufficient mixing effect is achieved, but on the other hand the desired continuous leakage of the mixed fingers is not prevented.
  • the peripheral speed of the mixing blades 14 in the central circular ring region 21 (which is determined by the material outlet opening 9) is decisive, and the falling speed of the fine material particles must also be taken into account in this region.
  • the mixing blades 14 As soon as the fine material to be mixed is detected by the mixing blades 14 on its fall path within the mixing container 2, the result is the falling speed of the mixed material particles and the peripheral speed of the mixing blades 14. So that the mixed fine material with rotating mixing blades 14 exits continuously from the outlet opening 9 can, the resulting speed must be directed to said central annular surface 21 with the outlet opening 9.
  • the peripheral speed and height of the mixing blades 14 would have to be adjusted to the fine material If optimal mixing results are to be achieved, since these are a function of the residence time in the mixer, the optimum partial filling quantity must be maintained at the same time. It has also already been said at the beginning that the radial position of the material outlet opening 9 can also influence the mixing time and the throughput time. This can also be seen well in the representation of the different fill level profiles A, B and C in FIG. In addition, if the passage cross section of the material outlet opening 9 is adjusted in the manner described above with the aid of the gate valve 19, there is a further possibility for influencing the mixing time and throughput. In a similar way, the mixing time of the fine material in the mixer 1 can also be influenced with the aid of several individually lockable product outlet openings provided in different radial positions in the container base.
  • the temperature of the fine material in the mixing container 2 can be controlled by changing the rotational speed of the agitator shaft 12 (and thus the peripheral speed of the mixing blades 14). This means that, for example, with an increase in the rotational speed of the agitator shaft 12, the temperature of the fine material in the container 2 can be increased and vice versa.
  • the mixing container 2 generally also has an essentially cylindrical shape. The embodiment described with reference to the drawing with a truncated cone-shaped upper container part 2a is advantageous in that the fine material circulation in the upper container area can be increased with maximum filling.
  • the throughput quantity emerging from the material outlet opening was reduced at the same time.
  • the outer cooling jacket of the mixing container was in a coolant (eg water or air) is supplied accordingly.
  • variable peripheral speed of the mixing blades 14 it should be added that it has been found that below a peripheral speed of 0.5 m / s there is no longer sufficient centrifugal effect from the mixing blades 14 on the fine particles, while the mixing fine material at a peripheral speed of Mixing blades 14 above 50 m / s to a certain extent occupies a level profile, ie The mixed fine material is prevented in this state from emerging from the material outlet opening 9.
  • the mixing blades 14a can exert a particularly favorable material pressure on the fine material located above the outer base ring surface 11.
  • the bend can, if necessary, be adapted to the fines to be mixed.
  • Fig. 4 illustrates a variant in which the material outlet opening 9 is formed by the radially inner part of the openings, which is released by the gate valve 19a, and which extends as far as the container peripheral wall 2b ', the radially outer part of which forms a total outlet opening 10 when the gate valve 19a is pulled completely outwards.

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

Abstract

Un mélangeur (1) avec un récipient de mélange (2) vertical et des outils mélangeurs (14) tournant dans celui-ci mélange un produit fin et sec qui est introduit par le haut et évacué par le bas grâce à une ouverture de décharge de produit (9). Entre cette ouverture, décalée radialement vers l'intérieur et située dans le fond du récipient (2d) vis-à-vis de la paroi périphérique du récipient (2b'), et la paroi périphérique du récipient est formée une surface annulaire de fond (11) sur laquelle un volume de remplissage partiel de produit fin est tout d'abord introduit lors d'une première étape de mélange en raison de la force centrifuge de bas en haut et radialement de l'extérieur vers l'intérieur jusqu'à la zone en anneau de cercle (21) qui contient l'ouverture de décharge de produit, avant qu'un apport supplémentaire de produit fin ne provoque la décharge continue par l'ouverture de décharge de produit (9) d'une quantité réglable de produit fin mélangé correspondant approximativement à la quantité de l'apport.
PCT/EP1984/000068 1983-03-11 1984-03-08 Procede et melangeur pour melanger continuellement un produit fin et sec, en particulier un materiau synthetique pulverulent ou granuleux Ceased WO1984003451A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833308712 DE3308712A1 (de) 1983-03-11 1983-03-11 Verfahren und mischer zum kontinuierlichen mischen von trockenem feingut, insbesondere pulverfoermigen oder koernigem kunststoff

Publications (1)

Publication Number Publication Date
WO1984003451A1 true WO1984003451A1 (fr) 1984-09-13

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PCT/EP1984/000068 Ceased WO1984003451A1 (fr) 1983-03-11 1984-03-08 Procede et melangeur pour melanger continuellement un produit fin et sec, en particulier un materiau synthetique pulverulent ou granuleux

Country Status (3)

Country Link
EP (1) EP0135571A1 (fr)
DE (1) DE3308712A1 (fr)
WO (1) WO1984003451A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112045883A (zh) * 2020-08-28 2020-12-08 泉州台商投资区正港工业设计服务中心 一种新型可自动翻转橡胶的塑炼机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH230900A (de) * 1942-07-15 1944-02-15 Lanz Fritz Vorrichtung zum Feinmischen pulverförmiger, trockener oder feuchter Stoffe.
DE2144715A1 (de) * 1971-09-07 1973-04-05 Papenmeier Kg Maschf Guenther Verfahren und vorrichtung zur herstellung von kunststoff-agglomeraten
DE2635756A1 (de) * 1976-08-09 1978-02-16 Friedrich Walter Adolf Herfeld Kontinuierlicher mischer mit einem mischbehaelter
GB2021962A (en) * 1978-05-18 1979-12-12 Cavalli Alfredo Domestic mixing apparatus
GB2046608A (en) * 1979-04-02 1980-11-19 Zyklos Maschinenbau Gmbh Discharging a mixer having a rotatable drum
FR2457711A1 (fr) * 1979-05-30 1980-12-26 Ladous Nicole Perfectionnement aux melangeurs avec turbine en fond de cuve
DE3111124A1 (de) * 1981-03-20 1982-09-30 Friedrich Walter Dr. 5982 Neuenrade Herfeld "zentrifugalmischer fuer trockenstoffe und pasten"

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB376057A (en) * 1931-08-12 1932-07-07 Albert William Sizer Improvements in moulding machines of the extrusion type
CH342451A (de) * 1955-03-17 1959-11-15 Henschel Flugmotorenbau Gmbh Verfahren zum Mischen und Zerkleinern von pulverförmigen und körnigen Stoffen und Maschine zur Durchführung des Verfahrens
DE1193016B (de) * 1960-12-15 1965-05-20 Henschel Werke Ag Kontinuierlich arbeitender Mischer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH230900A (de) * 1942-07-15 1944-02-15 Lanz Fritz Vorrichtung zum Feinmischen pulverförmiger, trockener oder feuchter Stoffe.
DE2144715A1 (de) * 1971-09-07 1973-04-05 Papenmeier Kg Maschf Guenther Verfahren und vorrichtung zur herstellung von kunststoff-agglomeraten
DE2635756A1 (de) * 1976-08-09 1978-02-16 Friedrich Walter Adolf Herfeld Kontinuierlicher mischer mit einem mischbehaelter
GB2021962A (en) * 1978-05-18 1979-12-12 Cavalli Alfredo Domestic mixing apparatus
GB2046608A (en) * 1979-04-02 1980-11-19 Zyklos Maschinenbau Gmbh Discharging a mixer having a rotatable drum
FR2457711A1 (fr) * 1979-05-30 1980-12-26 Ladous Nicole Perfectionnement aux melangeurs avec turbine en fond de cuve
DE3111124A1 (de) * 1981-03-20 1982-09-30 Friedrich Walter Dr. 5982 Neuenrade Herfeld "zentrifugalmischer fuer trockenstoffe und pasten"

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112045883A (zh) * 2020-08-28 2020-12-08 泉州台商投资区正港工业设计服务中心 一种新型可自动翻转橡胶的塑炼机
CN112045883B (zh) * 2020-08-28 2022-09-09 东莞市信诚硅胶电子有限公司 一种新型可自动翻转橡胶的塑炼机

Also Published As

Publication number Publication date
EP0135571A1 (fr) 1985-04-03
DE3308712A1 (de) 1984-09-13

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