CH318547A - Kneading pump for processing and conveying plastic masses - Google Patents
Kneading pump for processing and conveying plastic massesInfo
- Publication number
- CH318547A CH318547A CH318547DA CH318547A CH 318547 A CH318547 A CH 318547A CH 318547D A CH318547D A CH 318547DA CH 318547 A CH318547 A CH 318547A
- Authority
- CH
- Switzerland
- Prior art keywords
- bar
- threaded
- diameter
- screw
- processing
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/22—Extrusion presses; Dies therefor
- B30B11/24—Extrusion presses; Dies therefor using screws or worms
- B30B11/243—Extrusion presses; Dies therefor using screws or worms using two or more screws working in the same chamber
-
- 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
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
- B01F27/721—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with two or more helices in the same receptacle
- B01F27/723—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with two or more helices in the same receptacle the helices intermeshing to knead the mixture
-
- 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
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/484—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with two shafts provided with screws, e.g. one screw being shorter than the other
-
- 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
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
- B29B7/489—Screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
- B29C48/405—Intermeshing co-rotating screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
- B29C48/41—Intermeshing counter-rotating screws
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)
- Screw Conveyors (AREA)
Description
Knetpumpe zur Bearbeitung und Forderung von plastischen Massen
Die Erfindung bezieht sich auf Knetpum- pen, welche dazu dienen, plastische Massen, z. B. solche, die aus einem in erwärmtem Zustande eine plastische Masse ergebenden Pulver bestehen, zu kneten und gleichzeitig gegen einen höheren Druck zu fordern. Die bekannten Maschinen besitzen wenigstens ein Paar Selneeken, welche im Eingriff miteinander stehen und gleichsinnig oder gegensinnig rotieren. Hierbei hat man stets darauf geachtet, dass der Gewindebalken der Schneeken und ihre Gangl cken m¯glichst dicht miteinander kämmen im Bereich der gesamten Schneeken- lange oder mindestens am Austragsende.
Durch die Änderungen des Volumes der Kammern zwisehen den Windungen der Schneckengänge soll eine starke Durcharbei- tung der Masse erzielt werden, auch durch die Bewegung der Masse durch die Spalte der ineinandergreifenden Sehneeken.
Hierbei ergeben sich konstruktive und auch betriebliche Schwierigkeiten, wenn die zu verarbeitenden knetbaren Massen, wie tllermoplastische Kunststoffe oder Kautschuk- misehungen, ziemlich hart oder sehr zähe sind. Der Antrieb der Schneeken in diesen lZaschinen erfordert nämlich grosse Leistungen, mit welchen beträchtliche Dreh-und Biegebeanspruchungen der Kraftübertra- gungsglieder verbunden sind. Diese grossen Beanspruehungen verlangen eine Vergrösserung des Kerndurchmessers der Schneeken.
Durch die Vergrösserung des Kerndurchmes- sers werden aber die Volumen der Kammern und damit die Förderleistung verringert.
Ausserdem wird die Fähigkeit solcher mehrspindeliger Maschinen zum automatischen Einziehen der zu verarbeitenden Massen ver schlechtert.
Nach der Erfindung besitzen die einzelnen Schnecken wenigstens eines Paares inein- ander eingreifender Schnecken der Knetpumpe einen durchlaufenden Gewindebalken mit sich gegen den Gewindebalken der je weils andern Schnecke abstützender Rolleiste, deren Durchmesser kleiner als der Durchmes- ser des Gewindebalkens und grosser als der Kerndurchmesser der betreffenden Schnecke ist.
Die Abstützung der Rolleisten, die nicht den vollen Querschnitt der die Schnecken enthaltenden Gehäuseinnenräume beanspruchen, gestattet einen steifen Aufbau der Maschinen- teile und eine gute Forderwirkung, und es kann erreicht werden, dass die bearbeiteten Massen stark durchgearbeitet werden.
Auf der Zeichnung sind einige Ausführungsbeispiele des Erfindungsgegenstandes dargestellt. Es zeigen :
Fig. 1 Aufriss,
Fig. la Grundriss und
Fig. 2 Querschnitt einer Knetpumpe mit zwei gegenläufigen, gegensinnig geschnittenen Sehneeken,
Fig. 3 den Grundriss von zwei zusammen- arbeitenden Schnecken nach einer Modifikation der Erfindung und
Fig. 4 eine weitere Modifikation der Erfindung mit teilweise konischem Verlauf des Schneekenkernes.
Nach Fig. 1, la und 2 ist 1 eine linksgän- gige und 2 eine rechtsgängige Schnecke. Die Schneeke 2 steht im Eingriff mit der Schnecke 2. Der durchgehende Gewindebalken 3 der Schnecke 1 und der durchgehende Gewindebalken 4 der Schnecke 2 bestimmen den äussern Schneckendurchmesser, welcher gleich dem Gehäuseinnendurchmesser ist. Die Ge windebalken 3 und 4 beriihren sich seitlich in der Mitte zwischen den Schneeken 1 und 2 ; sie gehen über diese Mitte etwas hinaus, wie Fig. la zeigt.
Die schmalen Gewindebalken würden für sich allein nicht eine genügende Abst tzung und auch nicht eine ausreichende Abdichtung ergeben. Diese For derungen werden aber doch erfüllt, nämlich dadurch, dass seitlich am Gewindebalken 3 bzw. 4 eine Rolleiste 5 bzw. 6 vorgesehen wird, welche gleiche Steigung wie der Ge windebalken 3 bzw. 4, jedoch kleineren Durch- messer wie dieser hat. Der Gewindebalken 3 rollt auf der Leiste 6, der Gewindebalken 4 auf der Leiste 5 ab. Durch das Zusammenwirken der Gewindebalken und der ihnen gegenüber abgestuften Rolleisten kann eine gute Förderwirkung, eine wirksame Dichtung und ein guter mechanischer Lauf der Schnekken erreicht werden.
Die Anordnung der Rolleisten in Verbindung mit den Gewindebalken der Schnecke macht es möglich, den Durchmesser des Kernes 7 bzw. 8 der Schnecken zu verkleinern, je nach der Hoche der zu übertragenden Lei stung. Der Kerndurchmesser ist kleiner als der Durchmesser der entsprechenden Rollleiste 5 bzw. 6.
Gemäss ¯ Fig. 3 trÏgt jede Schnecke einen sehraubenlinienförmigen Gewindebalken mit einer Rolleiste. Die Forderkammern zwischen je zwei Windungen der Gewindebalken ver ändern sieh progressiv. Die Progression ergibt sich in an sich b & kannter Weise dadurch, dass der Gewindebalken 3 der Schnecke 1 in der Achsrichtung sich dadurch Ïndert, dass die beiden Wendelflächen verschiedene Stei gungswinkel haben. Die Breite des Balkens 4 der Schnecke 2 verändert sich in umgekehrtem Sinne wie diejenige des Balkens 3. Die Gewindebalken stützen sich je auf die Rollleiste 5 bzw. 6 der benachbarten Schnecke ab.
Dabei können die durch die erwähnte Progression breiter werdenden Gewindebalken 3 und 4 mit Einschnitten 12 und 13 versehen werden und so mit den bereits gegebenen For derkammern 11 und 10 zusammenwirken.
Diese Einschnitte 12 und 13 brauehen sich nielit über die ganze Lange der Sehnecke zu erstrecken.
Fig. 4 zeigt eine weitere Modifikation der Erfindung mit zwei Schnecken 1, 2, welche gegensinnig geschnitten sind und gegensinnig laufen. Auch hier findet sich die doppelte Anordnung von Gewindebalken mit Rolleisten 3 und 5 bzw. 4 und 6. Im Bereich der Zone 21 ist der Kern der Schneeke 1 zylindrisch, während der Kern der Schnecke 2 in der Zone 21 sich in Pfeilrichtung A relativ stark konisch erweitert.
Hierdurch wird das geför- derte Massevolumen in der Pfeilrichtimg A aus der Schneeke 2 herübergedrüekt in die Sehneeke 1. Diese Knetwirkung wiederholt sich dadurch, dass in der Zone 22 der Kern der Schneeke 1 sich konisch erweitert in der Pfeilriehtung A, während in der Zone 22 der Kern der Schnecke 2 zylindrisch bleibt. Die beschriebene Massnahme der verschiedenen Ausbildung der Schneckenkerne, teilweise konisch und teilweise zylindrisch, kann mehrfach wiederholt werden im Bereich der gesamten Pumpenlänge.
Es liegt im Bereich der Erfindung, statt zwei Schnecken drei oder mehrere Schnecken ineinander eingreifen zu lassen. Die beschrie- benen Anordnungen von Gewindebalken mit Rolleisten und vertieften Kernen können auch gewählt werden in Verbindung mit gleichsinnig geschnittenen Sehnecken, welche im gleichen Sinne rotieren.
Kneading pump for processing and conveying plastic masses
The invention relates to kneading pumps which are used to produce plastic masses, e.g. B. to knead those that consist of a plastic mass yielding in a heated state powder and at the same time to demand against a higher pressure. The known machines have at least one pair of Selneeken which are in engagement with one another and rotate in the same direction or in opposite directions. Care was always taken to ensure that the thread bar of the Schneeken and their passageways mesh as closely as possible over the entire length of the Schneeken or at least at the discharge end.
By changing the volume of the chambers between the turns of the worm threads, a strong working through of the mass should be achieved, also by moving the mass through the gaps in the interlocking tendons.
This results in constructive and operational difficulties when the kneadable masses to be processed, such as thermoplastic plastics or rubber misehings, are fairly hard or very tough. The drive of the Schneeken in these machines requires great power, which is associated with considerable torsional and bending loads on the power transmission members. These great stresses require an increase in the core diameter of the Schneeken.
By enlarging the core diameter, however, the volume of the chambers and thus the conveying capacity are reduced.
In addition, the ability of such multi-spindle machines to automatically pull in the masses to be processed is deteriorated ver.
According to the invention, the individual screws of at least one pair of interlocking screws of the kneading pump have a continuous threaded bar with a rolling bar which is supported against the threaded bar of the other screw and whose diameter is smaller than the diameter of the threaded bar and larger than the core diameter of the respective screw Snail is.
The support of the roller bars, which do not take up the full cross section of the interior housing spaces containing the screws, allows a rigid construction of the machine parts and a good conveying effect, and it can be achieved that the machined masses are worked through.
Some exemplary embodiments of the subject matter of the invention are shown in the drawing. Show it :
Fig. 1 elevation,
Fig. La floor plan and
Fig. 2 cross section of a kneading pump with two oppositely rotating tendons cut in opposite directions,
3 shows the floor plan of two co-operating screws according to a modification of the invention and
4 shows a further modification of the invention with a partially conical shape of the snow core.
According to FIGS. 1, 1 a and 2, 1 is a left-hand screw and 2 is a right-hand screw. The Schneeke 2 is in engagement with the screw 2. The continuous thread bar 3 of the screw 1 and the continuous thread bar 4 of the screw 2 determine the outer screw diameter, which is equal to the inner diameter of the housing. The threaded bars 3 and 4 touch laterally in the middle between the snow bars 1 and 2; they go somewhat beyond this middle, as Fig. la shows.
The narrow threaded bars on their own would not provide adequate support or adequate sealing. However, these requirements are met, namely in that a scroll bar 5 or 6 is provided on the side of the threaded bar 3 or 4, which has the same pitch as the threaded bar 3 or 4, but has a smaller diameter than this. The threaded bar 3 rolls on the bar 6, the threaded bar 4 on the bar 5. The interaction of the threaded bars and the stepped roller bars opposite them can achieve a good conveying effect, an effective seal and good mechanical running of the screws.
The arrangement of the scroll bars in connection with the thread bar of the screw makes it possible to reduce the diameter of the core 7 or 8 of the screws, depending on the height of the power to be transmitted Lei. The core diameter is smaller than the diameter of the corresponding roller bar 5 or 6.
According to ¯ Fig. 3, each screw carries a very helical thread bar with a roller bar. The delivery chambers between each two turns of the threaded bar change ver see progressively. The progression results in a manner known per se from the fact that the thread bar 3 of the worm 1 changes in the axial direction in that the two helical surfaces have different angles of inclination. The width of the bar 4 of the screw 2 changes in the opposite sense as that of the bar 3. The threaded bars are each supported on the roller bar 5 or 6 of the adjacent screw.
The thread bars 3 and 4, which become wider due to the progression mentioned, can be provided with incisions 12 and 13 and so cooperate with the derkammern 11 and 10 already given.
These incisions 12 and 13 need not extend over the entire length of the tendon.
Fig. 4 shows a further modification of the invention with two screws 1, 2, which are cut in opposite directions and run in opposite directions. Here, too, there is the double arrangement of threaded bars with roller strips 3 and 5 or 4 and 6 expanded.
As a result, the conveyed mass volume in the direction of the arrow A is pushed over from the Schneeke 2 into the tendons 1. This kneading effect is repeated in that in the zone 22 the core of the Schneeke 1 widens conically in the arrow direction A, the core of the screw 2 remains cylindrical. The measure described for the various designs of the screw cores, partly conical and partly cylindrical, can be repeated several times over the entire length of the pump.
It is within the scope of the invention to have three or more screws mesh with one another instead of two screws. The described arrangements of threaded bars with scroll bars and recessed cores can also be selected in connection with tendons cut in the same direction, which rotate in the same sense.
Claims (1)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE746853X | 1952-05-05 | ||
DE1076676X | 1952-05-05 | ||
DE318547X | 1952-05-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH318547A true CH318547A (en) | 1957-01-15 |
Family
ID=27189829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH318547D CH318547A (en) | 1952-05-05 | 1953-04-22 | Kneading pump for processing and conveying plastic masses |
Country Status (4)
Country | Link |
---|---|
US (1) | US2745643A (en) |
CH (1) | CH318547A (en) |
FR (1) | FR1076676A (en) |
GB (1) | GB746853A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2994562A (en) * | 1959-02-05 | 1961-08-01 | Warren Pumps Inc | Rotary screw pumping of thick fibrous liquid suspensions |
US3057665A (en) * | 1960-06-24 | 1962-10-09 | Warren Pumps Inc | Pump |
US3601035A (en) * | 1970-02-04 | 1971-08-24 | Land O Lakes Inc | Apparatus for treatment of plastic material |
DE2033201C3 (en) * | 1970-07-04 | 1979-02-01 | Allweiler Ag | Screw motor or pump |
US3733152A (en) * | 1971-10-29 | 1973-05-15 | Warren Pumps Inc | Rotary pump |
CA1115690A (en) * | 1977-08-11 | 1982-01-05 | Henry Ellwood | Mixer rotor with a shear edge |
US4509696A (en) * | 1982-08-30 | 1985-04-09 | Chemfix Technologies, Inc. | Method for treating liquid and semi-solid organic waste materials |
US4474479A (en) * | 1982-08-30 | 1984-10-02 | Chemfix Technologies, Inc. | Apparatus for treating liquid and semi-solid organic waste materials |
US4471916A (en) * | 1982-08-30 | 1984-09-18 | Chemfix Technologies, Inc. | Apparatus for treating liquid and semi-solid organic waste materials |
FR2538463B1 (en) * | 1982-12-23 | 1985-06-21 | Dba | VOLUMETRIC CONICAL SCREW MACHINE |
US4848659A (en) * | 1987-06-08 | 1989-07-18 | American Building Restoration Chemicals, Inc. | Electric stripper applicator |
DE102014219706B3 (en) * | 2014-09-29 | 2016-03-31 | Battenfeld-Cincinnati Austria Gmbh | extruder screw |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1423768A (en) * | 1921-04-25 | 1922-07-25 | William S Holdaway | Pump |
DE649638C (en) * | 1935-03-05 | 1937-08-30 | Kampens Mek Verksted As | Screw press with two or more interlocking press screws |
US2231357A (en) * | 1938-02-04 | 1941-02-11 | Leistritz Maschfabrik Paul | Kneading pump |
-
1952
- 1952-09-02 US US307503A patent/US2745643A/en not_active Expired - Lifetime
-
1953
- 1953-04-22 CH CH318547D patent/CH318547A/en not_active IP Right Cessation
- 1953-04-29 GB GB11828/53A patent/GB746853A/en not_active Expired
- 1953-05-05 FR FR1076676D patent/FR1076676A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1076676A (en) | 1954-10-28 |
US2745643A (en) | 1956-05-15 |
GB746853A (en) | 1956-03-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased |