CH387289A - Extruder screw - Google Patents
Extruder screwInfo
- Publication number
- CH387289A CH387289A CH1186960A CH1186960A CH387289A CH 387289 A CH387289 A CH 387289A CH 1186960 A CH1186960 A CH 1186960A CH 1186960 A CH1186960 A CH 1186960A CH 387289 A CH387289 A CH 387289A
- Authority
- CH
- Switzerland
- Prior art keywords
- screw
- extruder screw
- extruder
- speed
- melting
- Prior art date
Links
Classifications
-
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92028—Force; Tension
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92457—Drive section, e.g. gearbox, motor or drive fluids
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92866—Inlet shaft or slot, e.g. passive hopper; Injector, e.g. injector nozzle on barrel
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Gears, Cams (AREA)
Description
Extruderschnecke
Es wird bekanntlich bei vielen verfahrenstechnischen Prozessen verlangt, dass der Ausstoss einer Schnecke oder einer schneckenähnlichen, kontinuierlich arbeitenden Apparatur zeitlich konstant bleibt.
Diese Forderung wird beispielsweise bei Schmelzund Plastifizierschnecken mit hohem Grade an Exaktheit verlangt, sofern das verarbeitete Gut im Anschluss an dieses Aggregat im kontinuierlichen Verfahren versponnen oder gepresst wird. Zu diesem Zweck wird gewöhnlich einem Schnecken- oder ähnlichen Aggregat ein wirksames Dosierorgan, z. B. eine volumetrisch arbeitende Zahnradpumpe, nachgeschaltet, welches von dem Schneckenaggregat unmittelbar gespeist wird. Damit diese Schnecke im Laufe der Zeit weder leer- noch überläuft, muss ihre Einspeisung auf regeltechnischem Wege betrieben werden, zu welchem Zweck eine passende Regelgrösse benötigt wird, die über den jeweiligen Füllgrad der Schnecke Auskunft gibt und daher zum Regeln der Schneckenspeisung herangezogen werden kann.
Man versucht gewöhnlich, als eine derartige Regelgrösse den hydrostatischen Druck am Austritt des Schneckenaggregates zu benutzen. Je zäher jedoch das zu verarbeitende Gut ist, desto schwieriger und unzuverlässiger ist eine Druckmessung. Kommt eventuell, wie es bei den Schmelzschnecken der Fall ist, noch hinzu, dass das Gut eine Temperatur von 150-3000 C hat, so wird die Benutzung des hydrostatischen Drucks zu Regelzwecken praktisch illusorisch.
Anderseits werden die Schnecken- und schnecken ähnlichen Aggregate in erster Linie in Verbindung mit hochkonsistenten Gütern, wie Thermoplasten, Pasten, Teigen, Schmelzen usw., verwendet.
Gegenstand der Erfindung ist eine Extruderschnecke zum Schmelzen und Plastifizieren von Stoffen, hinter der ein zwangläufiges Förderorgan geschaltet ist, welches von der Extruderschnecke unmittelbar gespeist wird, die dadurch gekennzeichnet ist, dass die Schneckenwelle in der Axialrichtung von mindestens einer Feder abgestützt ist, die den Aus- und Einschaltkontakt eines Relais trägt, welches auf eine Füllvorrichtung der Schnecke oder auf die Drehzahl des Schneckenantriebs einwirkt.
In der erfindungsgemässen Extruderschnecke wird die Axialschubkraft, die um so stärker und unerbittlicher in Erscheinung tritt, je konsistenter die zu verarbeitenden Güter sind, als eine geeignete Regelgrösse zum Einregeln der Schneckenaggregate mit Erfolg herangezogen. Dabei bringt auch die eventuell hohe Temperatur im Gut keinen Nachteil mit sich, da die Wahrnehmung der Schubkraft gewöhnlich weit ausserhalb des Verarbeitungsraumes der Schnecke, etwa an der Antriebswelle des Aggregates, vorgenommen wird.
Neben der Regelung des Füllgrades kann der Axialschub auch zum Regeln anderer Grössen, wie etwa der Drehzahl des Schneckenaggregates, herangezogen werden. Das geschieht z. B. dann, wenn der kontinuierliche Ausstoss der Schnecke nicht durch die minderung des Füllgrades, sondern durch die Anderung der Drehzahl der Schnecke geregelt wird.
Die Erfindung bedeutet eine wesentliche Verbesserung der Regelfähigkeit der Schneckenaggregate und zeichnet sich durch hohe Zuverlässigkeit sowie durch die relative Einfachheit der konstruktiven Mittel aus.
In der Zeichnung ist das Prinzip der Erfindung an einem schematisch dargestellten Ausführungsbeispiel erläutert. Die Schneckenwelle 1 wird in der Axialrichtung von einer Feder 2 abgestützt. Da der auf die Schneckenwelle wirkende Axialschub 3 mit zunehmendem Füllgrad der Schnecke grösser wird, gibt die Feder bei Überschreitung einer gewissen Belastung nach und betätigt dabei ein Relais 4, welches die Regelung der Schnecke ermöglicht. Es kann dabei je nach der Regelaufgabe die Einspeisung, der Ausstoss oder die Drehzahl der Schnecke geregelt werden.
Extruder screw
As is known, in many process engineering processes it is required that the output of a screw or a screw-like, continuously operating apparatus remains constant over time.
This requirement is required with a high degree of accuracy for melting and plasticizing screws, for example, provided that the processed material is spun or pressed in a continuous process after this unit. For this purpose, an effective metering device, e.g. B. a volumetric gear pump, connected downstream, which is fed directly by the screw unit. So that this screw neither empties nor overflows in the course of time, its feed must be operated by means of control technology, for which purpose a suitable control variable is required, which provides information about the respective filling level of the screw and can therefore be used to regulate the screw feed.
Attempts are usually made to use the hydrostatic pressure at the outlet of the screw unit as such a controlled variable. However, the tougher the material to be processed, the more difficult and unreliable it is to measure pressure. If, as is the case with melting screws, it is possible that the goods have a temperature of 150-3000 C, the use of hydrostatic pressure for control purposes becomes practically illusory.
On the other hand, the screw and screw-like units are primarily used in connection with high-consistency goods such as thermoplastics, pastes, doughs, melts, etc.
The subject of the invention is an extruder screw for melting and plasticizing substances, behind which an inevitable conveying element is connected, which is fed directly by the extruder screw, which is characterized in that the screw shaft is supported in the axial direction by at least one spring that drives the out - and switch-on contact of a relay, which acts on a filling device of the screw or on the speed of the screw drive.
In the extruder screw according to the invention, the axial thrust force, which appears stronger and more relentless the more consistent the goods to be processed are, is successfully used as a suitable control variable for regulating the screw units. The possibly high temperature in the product does not have any disadvantage, since the thrust force is usually perceived far outside the processing space of the screw, for example on the drive shaft of the unit.
In addition to regulating the degree of filling, the axial thrust can also be used to regulate other variables, such as the speed of the screw unit. This happens z. B. when the continuous output of the screw is not controlled by reducing the degree of filling, but by changing the speed of the screw.
The invention means a significant improvement in the controllability of the screw units and is characterized by high reliability and the relative simplicity of the structural means.
In the drawing, the principle of the invention is explained using a schematically illustrated embodiment. The worm shaft 1 is supported by a spring 2 in the axial direction. Since the axial thrust 3 acting on the worm shaft increases with the degree of filling of the worm, the spring gives way when a certain load is exceeded and actuates a relay 4, which enables the worm to be regulated. Depending on the control task, the feed, the output or the speed of the screw can be controlled.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF0029797 | 1959-11-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH387289A true CH387289A (en) | 1965-01-31 |
Family
ID=7093466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1186960A CH387289A (en) | 1959-11-07 | 1960-10-24 | Extruder screw |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH387289A (en) |
GB (1) | GB897975A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5023030A (en) * | 1988-09-14 | 1991-06-11 | Oy Partek Ab | Method for casting one or several concrete products placed side by side |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104708797A (en) * | 2015-03-24 | 2015-06-17 | 桂林市兴安天成科技有限责任公司 | Tension sensing control device |
-
1960
- 1960-10-24 CH CH1186960A patent/CH387289A/en unknown
- 1960-11-04 GB GB38022/60A patent/GB897975A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5023030A (en) * | 1988-09-14 | 1991-06-11 | Oy Partek Ab | Method for casting one or several concrete products placed side by side |
Also Published As
Publication number | Publication date |
---|---|
GB897975A (en) | 1962-06-06 |
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