DE102022127357A1 - ROLL CYLINDER, INTERMEDIATE RING, PLANETARY ROLL EXTRUDER AND PROCESS - Google Patents

Abstract

The invention relates to roller cylinders (1) for a planetary roller extruder (50) constructed from modules (M) with a special favorable length (LW), to transition elements (20, 30) between the roller cylinders (1) in the form of toothed cylindrical intermediate rings (20) or non-toothed cylindrical starting or dispersing rings (30) also with a special favorable length (LÜ, LAD), to a planetary roller extruder (50) constructed from modules (M) comprising these components (1, 20, 30), and to a method (100) for assembling such a planetary roller extruder (50).

Description

The present invention relates, inter alia, to a roller cylinder for a planetary roller extruder constructed from modules with a special favorable length, to transition elements between the roller cylinders in the form of toothed cylindrical intermediate rings or non-toothed cylindrical starting or dispersing rings, also with a special favorable length, to a planetary roller extruder constructed from modules comprising these components, and to a method for assembling such a planetary roller extruder.

The main types of extruders are single-screw extruders, twin-screw extruders and planetary roller extruders. The planetary roller extruder allows particularly good thermal process control, which has opened up new fields of application in the plastics industry and other industries. The mechanical principle of the planetary roller extruder corresponds to a 45° helical planetary gear with a fixed roller cylinder and floating planetary spindles that are driven by a central spindle so that they perform a rolling and orbiting movement in the direction of rotation of the central spindle when the central spindle rotates. The planetary spindles are toothed on the outside and engage both the teeth of the central spindle and the teeth of the roller cylinder. The planetary spindles are under pressure in the longitudinal direction due to the helical gearing. The pressure is directed towards the discharge end of the extruder. This pressure is absorbed by thrust rings at the end of the extruder. The planetary spindles slide along the thrust ring as they rotate around the central spindle.

The design of a planetary roller extruder as a multi-modular system means that processes of increasing complexity can be implemented on the corresponding machine type, so that an extensive, cross-size system kit for modular planetary roller extruders with modules of various lengths is now available. Modular planetary roller extruders can now comprise between two and up to more than eight modules, with more process steps being able to be implemented in direct sequence if the planetary roller extruder is longer. In addition to melting and mixing processes, degassing and reactive processes are also being implemented more and more frequently. This means that solid and liquid feeds as well as degassing points can be implemented at almost any position along the process line.

It is often advantageous or even necessary not to feed solids via the main feed of the planetary roller extruder, but only later in the process using feeds connected to the side of the extruder. A typical application is, for example, the compounding of polymers with fillers and reinforcing materials only after the base polymer has been melted in previous modules. These side feeds or discharges are generally also referred to as so-called "features" and can serve other different purposes in addition to the feed of solids. The location and number of side-mounted feeds and/or discharges can be designed differently depending on the desired process. In the modules provided for the attachment of such feeds and/or discharges, the respective connections are preconfigured and, in the modular design, are arranged in the same position in the roller cylinder of the respective module.

When merging, the modules must be aligned with one another due to the internal gearing of the roller cylinder, so that the internal gearing parallel to the continuous central spindle also has the same orientation along the planetary roller extruder to the central spindle. If the modules are of different or unfavorable lengths, this can mean that the externally attached inlets and/or outlets cannot all be attached to the different modules of the modular planetary roller extruder at the same angle, which on the one hand places mechanical stress on the planetary roller extruder over its entire length and can cause difficulties when assembling the lateral inlets and outlets.

It would therefore be desirable to have a solution to avoid additional mechanical stress on modular planetary roller extruders, which also facilitates the assembly of the side feed and discharge lines.

It is an object of the present invention to provide an improvement or an alternative to the prior art.

This object is achieved by a roller cylinder for a planetary roller extruder constructed from modules with an inner side and an outer side and with a spiral-shaped internal toothing running from a first end of the roller cylinder to the opposite second end on the inner side of the roller cylinder, consisting of a plurality of tooth spirals running parallel on the inner side and equally spaced from one another, wherein the roller cylinder has a length parallel to its cylinder axis, which is adapted so that each tooth of the internal toothing at the first end of the roller cylinder is in projection along the cylinder axis is in alignment with a tooth at the second end of the roller cylinder.

The fixed roller cylinder forms the outer component of a planetary roller extruder, the mechanical principle of which is that planetary spindles floating on the internal teeth of the roller cylinder rotate, which in turn are floating on a central spindle that runs through the roller cylinder along its cylinder axis and are driven by the rotation of the central spindle, so that they perform a rolling and orbiting movement in the direction of rotation of the central spindle over the inside of the roller cylinder. The planetary spindles are externally toothed and engage in their rotation both in the teeth of the central spindle, which also has continuous external teeth, and in the teeth of the roller cylinder. The assembly of roller cylinder, central spindle and planetary spindles is called a module, with the central spindle passing through the modules as a common central spindle, while the roller cylinders and in most cases also the planetary spindles are restricted to the respective module. In some embodiments, however, the planetary spindles can also extend over two or more modules, the length of which in this case is defined by the roller cylinders alone.

The projection of the teeth at one end onto the teeth at the other end is a graphic projection, since the rotating tooth spirals are in the projection path for an actual optical projection along the inside, so that the teeth at the other end of the roller cylinder are covered. Nevertheless, such a projection can be carried out graphically as part of the design and the length required to cover the teeth can be determined constructively and the correspondingly designed roller cylinder can then be manufactured with this special length. The teeth that cover in the projection do not necessarily have to be the teeth of the same tooth spiral. A tooth spiral is the course of a toothing along the inside of the roller cylinder from the first to the second end, with the toothing running spirally over the inner wall. Teeth of different tooth spirals can also be made to cover by choosing the appropriate length of the roller cylinder, with all the teeth of the first end then covering one tooth of another tooth spiral at the second end. In this respect, with n spiral teeth of the internal toothing on the inside, there are n teeth at the respective first and second ends and thus n possible lengths for the roller cylinder per integer revolution of the spiral teeth, in which the teeth can be made to coincide as claimed above. The individual length of the roller cylinder depends on the distance between the spiral teeth and the pitch of the spiral teeth relative to the cylinder axis. Therefore, the length of the roller cylinder can only be claimed functionally for comprehensive protection of the roller cylinder according to the present invention. Examples of specific embodiments are only intended to illustrate the present invention in the description of the figures, without restricting the scope of protection to these examples.

The tooth of the first and second end refers to the cross-section through the tooth spiral that is obtained when the roller cylinder is cut perpendicular to the cylinder axis of the roller cylinder. Since the ends of the roller cylinders on the first and second sides are each aligned perpendicular to the cylinder axis (otherwise a continuous central spindle could not be arranged through the modules in the modular planetary roller extruder), the teeth on the first and second ends coincide when projected apart if the roller cylinder is of a suitable length along the cylinder axis. If both end surfaces of the roller cylinder were to be understood as the respective surfaces of an identical clock with, for example, a tooth at a "12 o'clock" position at the first end, then the roller cylinder claimed would also have a tooth arranged at the same "12 o'clock" position at the second end of the roller cylinder.

The roller cylinder according to the invention with the correspondingly determined special length along its cylinder axis provides a solution for avoiding additional mechanical loads in modular planetary roller extruders, which also makes it easier to install the lateral inlets and outlets. If the roller cylinders did not have this special length, it would not be possible to align the inlets and outlets in such a way that the mechanical load on the roller cylinder is low and the same for all roller cylinders of a modular planetary roller extruder. Installing inlets and outlets in any orientation would also be much more difficult than with a vertical or horizontal orientation. Other extruders are used as inlets, for example, where the spindle should be inserted into the roller cylinder as horizontally or vertically as possible in order to avoid having to provide complicated installation aids, for example for an inclined insertion.

In one embodiment, the roller cylinder comprises on its outside one or more connection arrangements suitable for connecting lateral inlets and outlets. Such a connection arrangement can be designed as a flange in an area of the outside of the roller cylinder. The lateral inlets and outlets can can be provided with an appropriately designed counter flange so that both components can be connected to one another via the flange. The term "lateral" here only means that the inlets and outlets are arranged perpendicular to the cylinder axis on the outside of the roller cylinder. The term "lateral", on the other hand, does not refer to the spatial orientation of the inlets and outlets relative to a base (parallel, perpendicular or at a different angle to one another) on which the planetary roller extruder with such roller cylinders is mounted. Inlets and outlets can, for example, be used to feed solids or liquids (inlets). The inlets and outlets could also be used to remove material from the roller cylinder or to degas the material processed in the roller cylinder (outlets) or for other purposes. The possibility of arranging one or more inlets and outlets on one or more roller cylinders enables solid or liquid supply as well as degassing of the processed material at almost any position in the process line and thus an exact adjustment of the planetary roller extruder to the individual requirements of a process, so that the application area of the planetary roller extruder is further broadened.

In a further embodiment, the connection arrangement of the roller cylinders is aligned such that, after suitable alignment of the roller cylinders to one another, lateral inlets and outlets can be mounted horizontally and/or vertically to the base of the planetary roller extruder. In conjunction with the length of the roller cylinder selected according to the present invention, this avoids additional mechanical stresses on modular planetary roller extruders and at the same time facilitates the assembly of the lateral inlets and outlets.

In a further embodiment, the length parallel to its cylinder axis is adjusted so that each tooth of the internal toothing at the first end of the roller cylinder, in projection along the cylinder axis, comes from the same tooth spiral to coincide with the tooth at the second end. This allows the modular design to be standardized even further, which further simplifies the modular construction system.

The invention further relates to a toothed cylindrical intermediate ring for an arrangement between two roller cylinders according to the invention in a modular planetary roller extruder, wherein the toothed intermediate ring has an inner side and an outer side and an internal toothing running from a first end of the toothed intermediate ring to the opposite second end on the inner side of the toothed intermediate ring and consisting of a plurality of tooth spirals running parallel on the inner side and equidistant from one another, wherein the internal toothing is designed analogously to the internal toothing of the roller cylinders between which the toothed intermediate ring is intended for arrangement, wherein the toothed intermediate ring has a length parallel to its cylinder axis, which is adapted so that each tooth of the internal toothing at the first end of the toothed intermediate ring is in projection along the cylinder axis in register with a tooth at the second end of the toothed intermediate ring. Since the intermediate ring is located between two roller cylinders, it must in principle meet the same length requirements as the roller cylinder itself, so that the advantage of the roller cylinder is not lost due to an intermediate ring that is not adapted in length. Since the intermediate ring is shorter in the direction of its cylinder axis than the roller cylinder, only the teeth of one end need to be aligned with the teeth of the other end over the selected length of the intermediate ring, without the aligned teeth having to be the teeth of the same spiral gear. The intermediate ring according to the invention achieves or maintains the same advantages as already described for the bug cylinder. An intermediate ring represents a toothed connection between the two roller cylinders, so that the planetary spindles can also be guided over the area of the toothed intermediate ring. In addition, intermediate rings (toothed or non-toothed) enable sensors, such as temperature sensors, to be attached at a close distance to the material processed in the planetary roller extruder by means of radial holes in the material of the intermediate ring.

The invention further relates to a non-toothed cylindrical starting or dispersing ring for an arrangement between two roller cylinders according to the invention in a modular planetary roller extruder, wherein the non-toothed starting or dispersing ring has a length between a first end and a second end of the non-toothed starting or dispersing ring along the cylinder axis, which is equal to the length of a toothed cylindrical intermediate ring according to the invention intended for arrangement between the same roller cylinders. Since in the case of non-toothed starting or dispersing rings, no teeth can be brought into alignment in projection, since there are no teeth there, the length of the starting or dispersing ring can nevertheless be selected such that the advantages of the roller cylinder according to the invention described above are retained in the same way. remain as if an internally toothed intermediate ring had been arranged there instead of the starting or dispersing ring. The two roller cylinders with the starting or dispersing ring in between could be aligned in exactly the same way as described above if the special length of the starting or dispersing ring is selected accordingly, resulting in the same advantages as described above. A starting ring represents a starting surface for the planetary spindle, so that axial movement of the planetary spindles along the central spindle is limited by the starting surface. In addition to this mechanical function, the starting ring creates a flow resistance for the material processed in the planetary roller extruder, for which purpose it protrudes into the space between the inside of the roller cylinder and the central spindle and thus also divides the two roller cylinders into separate modules. The dispersing ring serves the same purposes as the starting ring, so that what has been described above for the starting ring also applies to the dispersing ring. In contrast to the starting ring, the dispersion ring extends even further into the space between the inside of the roller cylinder and the central spindle, so that the central spindle has no external teeth in the area of the dispersion ring in order to be able to make the central hole in the dispersion ring around the central spindle as small as possible in order to be able to make the flow resistance for the material processed in the planetary roller extruder even more specific.

The invention further relates to a planetary roller extruder constructed from modules comprising at least two roller cylinders according to the invention, an externally toothed central spindle extending through the roller cylinders to one end of the planetary roller extruder and at least one, preferably a plurality of externally toothed planetary spindles arranged between the central spindle and the roller cylinder, wherein a cylindrical transition element in the form of an intermediate ring according to the invention or a starting or dispersing ring according to the invention is arranged between two roller cylinders arranged one after the other. The planetary roller extruder according to the invention with the correspondingly determined special lengths of the roller cylinders and the transition element between the roller cylinders along their cylinder axes provides a solution for avoiding additional mechanical loads in the planetary roller extruders according to the invention, which also facilitates the assembly of the lateral inlets and outlets. Preferably, all roller cylinders of the planetary roller extruder and the transition elements used have the length specified according to the present invention.

In one embodiment, a lateral feed and discharge is arranged on at least one of the roller cylinders by means of a connection to the connection arrangement of the roller cylinder. The details already described above also apply here to the lateral feed and discharge.

In a further embodiment, one or more lateral feed and discharge lines are arranged on several roller cylinders, which are aligned either parallel to one another or at a 90° angle to one another. This enables the planetary roller extruder to be loaded evenly for all modules.

In a further embodiment, the multiple lateral inlets and outlets are aligned horizontally to the base on which the planetary roller extruder is set up, or vertically to it. Such an alignment minimizes the mechanical loads on the planetary roller extruder caused by the inlets and outlets, which is only made possible by the special lengths of the roller cylinders and transition elements according to the invention.

• - Bereitstellen eines bereits auf Komponenten des Planetwalzenextruders montierten ersten der Walzenzylinder;
• - Montieren eines Übergangselements in Form eines erfindungsgemäßen verzahnten zylinderförmigen Zwischenrings oder eines erfindungsgemäßen nicht verzahnten zylinderförmigen Anlauf- oder Dispergierrings auf den ersten der Walzenzylinder, wobei im Falle des verzahnten zylinderförmigen Zwischenringes die Zähne der Zwischenrings und die Zähne des ersten Walzenzylinders an ihren aufeinander zugewandten Ende so aufeinander ausgerichtet werden, dass die Zähne der zugewandten Enden zur Deckung kommen;
• - Montieren eines weiteren der Walzenzylinder auf das Übergangselement, wobei der weitere Walzenzylinder so gegenüber dem Übergangselement ausgerichtet wird, als wäre das Übergangselement ein verzahnter zylinderförmiger Zwischenring, bei dem die Zähne des Walzenzylinders und die Zähne des angenommenen Zwischenrings an ihren aufeinander zugewandten Enden so aufeinander ausgerichtet würden, dass die Zähne der zugewandten Enden zur Deckung kämen; und
• - Widerholen der beiden vorangegangenen Schritte im Falle der Montage weiterer Walzenzylinder.

The invention further relates to a method for assembling a planetary roller extruder constructed from modules comprising one or more roller cylinders according to the invention, comprising the following steps:

• - Providing a first of the roller cylinders already mounted on components of the planetary roller extruder;
• - Mounting a transition element in the form of a toothed cylindrical intermediate ring according to the invention or a non-toothed cylindrical starting or dispersing ring according to the invention on the first of the roller cylinders, wherein in the case of the toothed cylindrical intermediate ring the teeth of the intermediate ring and the teeth of the first roller cylinder are aligned with one another at their mutually facing ends in such a way that the teeth of the facing ends coincide;
• - mounting a further roller cylinder on the transition element, the further roller cylinder being aligned with respect to the transition element as if the transition element were a toothed cylindrical intermediate ring, in which the teeth of the roller cylinder and the teeth of the assumed intermediate ring would be aligned at their mutually facing ends in such a way that the teeth of the facing ends would coincide; and
• - Repeat the two previous steps if additional roller cylinders are to be installed.

The method according to the invention makes it possible to avoid additional mechanical stresses on modular planetary roller extruders by installing lateral inlets and outlets and at the same time to facilitate the installation of the lateral inlets and outlets.

In one embodiment, when mounting the roller cylinders, they are aligned in such a way that existing connection arrangements of the roller cylinders are suitable for connection for lateral inlets and outlets so that later connected lateral inlets and outlets are arranged horizontally and/or vertically to the base of the planetary roller extruder.

It should also be mentioned at this point that in the context of the present patent application, the expression "in particular" is always to be understood as introducing an optional, preferred feature. Accordingly, the expression is not to be understood as "and in fact" or "namely".

It is understood that features of the solutions described above or in the claims can also be combined if necessary in order to be able to realize the advantages and effects that can be achieved here cumulatively. The above-mentioned embodiments of the present invention can also be combined with one another in a manner deviating from the reference numerals given in the claims.

Furthermore, further features, effects and advantages of the present invention are explained with reference to the attached figures and the following description. Components which are at least substantially identical in terms of their function in the individual figures are identified here with the same reference numerals, whereby the components do not have to be numbered and explained in all figures.

• 1: zeigt eine Ausführungsform eines Walzenzylinders im Schnittbild;
• 2: zeigt eine Ausführungsform (a) eines Zwischenrings, (b) eines Anlaufrings und (c) eines Dispergierrings;
• 3: zeigt eine Ausführungsform eines aus Modulen aufgebauten Planetwalzenextruders; und
• 4: zeigt ein erfindungsgemäßes Verfahren zur Montage eines aus Modulen aufgebauten Planetwalzenextruder.

The drawings show:

• 1 : shows an embodiment of a roller cylinder in a sectional view;
• 2 : shows an embodiment of (a) an intermediate ring, (b) a starting ring and (c) a dispersing ring;
• 3 : shows an embodiment of a planetary roller extruder constructed from modules; and
• 4 : shows a method according to the invention for assembling a planetary roller extruder constructed from modules.

Detailed description of the implementation examples

1 shows an embodiment of a roller cylinder 1 according to the invention for a planetary roller extruder 50 constructed from modules M in a sectional view. The roller cylinder 1 comprises an inner side 11 and an outer side 12 as well as a spiral-shaped internal toothing 13 running from a first end 1a of the roller cylinder 1 to the opposite second end 1b on the inner side 11 of the roller cylinder 1 and made up of a large number of tooth spirals ZS running parallel on the inner side 11 and at the same distance from one another, the roller cylinder 1 having a length LW parallel to its cylinder axis Z, which is adapted so that each tooth 13a of the internal toothing 13 at the first end 1a of the roller cylinder 1 is in line with a tooth 13b at the second end 1b of the roller cylinder 1 in projection along the cylinder axis Z. The roller cylinder 1 can comprise on its outer side 12 one or more connection arrangements 14 (not shown) suitable for connecting lateral inlets and outlets 40 (not shown). The connection arrangement 14 of the roller cylinder 1 is aligned such that, after suitable alignment of the roller cylinders 1 to one another, lateral inlets and outlets 40 can be mounted horizontally and/or vertically to the base 80 (not shown) of the planetary roller extruder 50. In one embodiment, the length LW parallel to the cylinder axis Z of the roller cylinder 1 is adjusted such that each tooth 13a of the internal toothing 13 at the first end 1a of the roller cylinder 1 in projection along the cylinder axis Z comes from the same tooth spiral ZS to coincide with the tooth 13b at the second end 1b.

2 shows an embodiment (a) of an intermediate ring 20, (b) of a starting ring 30 and (c) of a dispersing ring 30 according to the present invention for an arrangement between two roller cylinders according to the invention, see 1 . The toothed intermediate ring 20 with an inner side 21 and an outer side 22 and with a first end 20a of the toothed intermediate ring 20 to the opposite second end 20b comprises a continuous internal toothing 23 arranged on the inner side 21 of the toothed intermediate ring 20, consisting of a plurality of tooth spirals ZS running parallel on the inner side 21 and at the same distance from one another, wherein the internal toothing 23 is designed analogously to the internal toothing 11 of the roller cylinders 1, between which the toothed intermediate ring 20 is provided for arrangement, wherein the toothed intermediate ring 20 has a length LZ parallel to its cylinder axis Z, which is adapted so that each tooth 23a of the internal toothing 23 at the first end 20a of the toothed intermediate ring 20 is in projection along the cylinder axis Z in register with a tooth 23b at the second end 20b of the toothed intermediate ring 20. The non-toothed cylindrical starting or dispersing ring (30) also has a length (LAD) between a first end (30a) and a second end (30b) of the non-toothed starting or dispersing ring (30) along the cylinder axis, which is equal to the length of the toothed cylindrical intermediate ring (20) according to the invention intended for arrangement between the same roller cylinders (1).

3 shows an embodiment of a planetary roller extruder 50 according to the invention constructed from modules M, comprising at least two roller cylinders (1) according to the invention, an externally toothed central spindle (60) extending through the roller cylinders (1) to one end of the planetary roller extruder (50) and at least one, preferably a plurality of externally toothed planetary spindles (70) arranged between the central spindle and the roller cylinder (1), wherein a cylindrical transition element in the form of an intermediate ring (20) according to the invention or a starting or dispersing ring (30) according to the invention is arranged between two roller cylinders (1) arranged one after the other. In this case, lateral inlets and outlets (40) (not shown) are arranged on the roller cylinder (1) by means of a connection to the connection arrangement (14) (not shown) of the roller cylinder (1), which are aligned either parallel to one another or at a 90° angle to one another. The lateral inlets and outlets (40) are also aligned horizontally to the base (80) (not shown) on which the planetary roller extruder (50) is installed, or vertically thereto.

4 shows a method 100 according to the invention for assembling a planetary roller extruder 50 constructed from modules M comprising one or more roller cylinders 1 according to the invention, comprising subsequent steps of providing 110 a first of the roller cylinders 1 already mounted on components of the planetary roller extruder 50; of mounting 120 a transition element in the form of a toothed cylindrical intermediate ring 20 according to claim 4 or a non-toothed cylindrical starting or dispersing ring 30 according to claim 5 on the first of the roller cylinders 1, wherein in the case of the toothed cylindrical intermediate ring 20 the teeth 23a of the intermediate ring 20 and the teeth 13b of the first roller cylinder 1 are aligned at their mutually facing ends 20a, 1b such that the teeth 23a, 13b of the facing ends 20a, 1b coincide, of mounting 130 a further one of the roller cylinders 1 on the transition element 20, 30, wherein the further roller cylinder 1 is aligned with respect to the transition element 20, 30 as if the transition element 20, 30 were a toothed cylindrical intermediate ring 20 in which the teeth 13a of the roller cylinder 1 and the teeth 23a of the assumed intermediate ring 20 at their mutually facing ends 1a, 20b would be aligned with one another in such a way that the teeth 13a, 23b of the facing ends 1a, 20b would coincide; and repeating 140 the two previous steps in the case of assembling further roller cylinders 1. When assembling 130 the roller cylinders 1, these are aligned in such a way that existing connection arrangement 14 of the roller cylinders 1 suitable for connecting for lateral inlets and outlets 40 are aligned in such a way that later connected lateral inlets and outlets 40 are arranged horizontally and/or vertically to the base 80 of the planetary roller extruder 50.

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all combinations of the features described in the embodiments are necessarily essential means for achieving the object of the invention.

List of reference symbols

1

Roller cylinder

1a

first end of the roller cylinder

1b

second end of the roller cylinder

11

Inside of the roller cylinder

12

Outside of the roller cylinder

13

Internal teeth on the inside

13a

Tooth of the internal gear at the first end

13b

Tooth of the internal gear at the second end

14

Connection arrangement for supply and discharge lines to be connected

20

toothed cylindrical intermediate ring (transition element)

20a

first end of the toothed cylindrical intermediate ring

20b

second end of the toothed cylindrical intermediate ring

21

Inside of the toothed cylindrical intermediate ring

22

Outside of the toothed cylindrical intermediate ring

23

Internal teeth on the inside

23a

Tooth of the internal gear at the first end

23b

Tooth of the internal gear at the second end

30

non-toothed cylindrical starting or dispersing ring (transition element)

40

side inlets and outlets

50

Planetary roller extruder

60

Central spindle

70

Planetary spindle(s)

80

Subsurface (or ground)

100

Method for assembling a modular planetary roller extruder

110

Providing a first of the roller cylinders already mounted on components of the planetary roller extruder

120

Mounting a transition element on the first of the roller cylinders

130

Mounting another of the roller cylinders on the transition element

140

Repeat the two previous steps if additional roller cylinders are to be installed

LAD

Length of the non-toothed cylindrical starting or dispersing ring

LW

Length of the roller cylinder

LZ

Length of the toothed cylindrical intermediate ring

M

Modules of the planetary roller extruder

Z

Cylinder axis of the roller cylinder

ZS

Dental spirals

Claims (12)

Roller cylinder (1) for a planetary roller extruder (50) constructed from modules (M), having an inner side (11) and an outer side (12), and having a spiral-shaped internal toothing (13) extending from a first end (1a) of the roller cylinder (1) to the opposite second end (1b) on the inner side (11) of the roller cylinder (1), comprising a plurality of tooth spirals (ZS) running parallel on the inner side (11) and equidistant from one another, the roller cylinder (1) having a length (LW) parallel to its cylinder axis (Z), which is adapted so that each tooth (13a) of the internal toothing (13) at the first end (1a) of the roller cylinder (1) is in projection along the cylinder axis (Z) in register with a tooth (13b) at the second end (1b) of the roller cylinder (1). Roller cylinder (1) after Claim 1 , characterized in that the roller cylinder (1) comprises on its outer side (12) one or more connection arrangements (14) suitable for connecting lateral inlets and outlets (40). Roller cylinder (1) after Claim 2 , characterized in that the connection arrangement (14) of the roller cylinders (1) is aligned such that after suitable alignment of the roller cylinders (1) to one another, lateral inlets and outlets (40) can be mounted horizontally and/or vertically to the base (80) of the planetary roller extruder (50). Roller cylinder (1) according to one of the preceding claims, characterized in that the length (LW) parallel to its cylinder axis (Z) is adapted such that each tooth (13a) of the internal toothing (13) at the first end (1a) of the roller cylinder (1) in projection along the cylinder axis (Z) comes from the same tooth spiral (ZS) to coincide with the tooth (13b) at the second end (1b). Toothed cylindrical intermediate ring (20) for an arrangement between two roller cylinders (1) according to one of the preceding claims in a modular planetary roller extruder (50), wherein the toothed intermediate ring (20) has an inner side (21) and an outer side (22) and an internal toothing (23) extending from a first end (20a) of the toothed intermediate ring (20) to the opposite second end (20b) on the inner side (21) of the toothed intermediate ring (20) and consisting of a plurality of tooth spirals (ZS) running parallel on the inner side (21) and at the same distance from one another, wherein the internal toothing (23) is designed analogously to the internal toothing (11) of the roller cylinders (1) between which the toothed intermediate ring (20) is provided for arrangement, wherein the toothed intermediate ring (20) has a length (LZ) parallel to its cylinder axis (Z), which is adapted so that each tooth (23a) of the Internal teeth (23) at the first end (20a) of the toothed intermediate ring (20) are projected along the cylinder axis (Z) and coincide with a tooth (23b) at the second end (20b) of the toothed intermediate ring (20). Non-toothed cylindrical starting or dispersing ring (30) for an arrangement between two roller cylinders (1) according to one of the Claims che 1 until 4 in a modular planetary roller extruder (50), wherein the non-toothed starting or dispersing ring (30) has a length (LAD) between a first end (30a) and a second end (30b) of the non-toothed starting or dispersing ring (30) along the cylinder axis, which is equal to the length of a toothed cylindrical intermediate ring (20) according to Claim 5 intended for arrangement between the same roller cylinders (1). A planetary roller extruder (50) constructed from modules (M) comprising at least two roller cylinders (1) according to one of the Claims 1 until 4 , an externally toothed central spindle (60) extending through the roller cylinders (1) to one end of the planetary roller extruder (50) and at least one, preferably a plurality of externally toothed planetary spindles (70) arranged between the central spindle and the roller cylinder (1), wherein between two roller cylinders (1) arranged one after the other a cylindrical transition element in the form of an intermediate ring (20) or a starting or dispersing ring (30) according to one of the Claims 5 or 6 is arranged. Planetary roller extruder (50) according to Claim 7 , characterized in that a lateral supply and discharge line (40) is arranged on at least one of the roller cylinders (1) by means of a connection to the connection arrangement (14) of the roller cylinder (1). Planetary roller extruder (50) according to Claim 8 , characterized in that one or more lateral inlets and outlets (40) are arranged on several roller cylinders (1), which are aligned either parallel to one another or at a 90° angle to one another. Planetary roller extruder (50) according to Claim 9 , characterized in that the plurality of lateral inlets and outlets (40) are aligned horizontally to the base (80) on which the planetary roller extruder (50) is installed, or vertically thereto. Method (100) for assembling a planetary roller extruder (50) constructed from modules (M) comprising one or more roller cylinders (1) according to a Claims 1 - 3 , comprising the following steps: - providing (110) a first of the roller cylinders (1) already mounted on components of the planetary roller extruder (50); - mounting (120) a transition element in the form of a toothed cylindrical intermediate ring (20) according to Claim 4 or a non-toothed cylindrical starting or dispersing ring (30) according to Claim 5 on the first of the roller cylinders (1), wherein in the case of the toothed cylindrical intermediate ring (20), the teeth (23a) of the intermediate ring (20) and the teeth (13b) of the first roller cylinder (1) are aligned with one another at their mutually facing ends (20a, 1b) in such a way that the teeth (23a, 13b) of the facing ends (20a, 1b) coincide, - mounting (130) a further one of the roller cylinders (1) on the transition element (20, 30), wherein the further roller cylinder (1) is aligned with respect to the transition element (20, 30) in such a way as if the transition element (20, 30) were a toothed cylindrical intermediate ring (20), in which the teeth (13a) of the roller cylinder (1) and the teeth (23a) of the assumed intermediate ring (20) are aligned with one another at their mutually facing ends (1a, 20b) in such a way would be aligned with each other so that the teeth (13a, 23b) of the facing ends (1a, 20b) would coincide; and - repeating (140) the two previous steps in the case of mounting further roller cylinders (1). Procedure (100) according to Claim 11 , wherein during assembly (130) of the roller cylinders (1) these are aligned such that existing connection arrangement (14) of the roller cylinders (1) suitable for connection for lateral inlets and outlets (40) are aligned such that later connected lateral inlets and outlets (40) are arranged horizontally and/or vertically to the base (80) of the planetary roller extruder (50).

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