Rotor-type pump assembly and installation comprising same

Abstract

The invention relates to an installation (1) for processing a material strip, the material strip in particular comprising a rubber mixture or silicone. The installation comprises a rotor-type pump assembly (2) for transporting the material strip through the installation, having a pump housing (4) which defines a pump interior (3), at least one inlet duct (5) on the inlet side and an outlet in the lateral surface of the pump housing, and at least two pump rotors (6, 8) which are mounted in the pump housing and which are in contact with the material strip during operation of the installation for transporting the material strip through the installation, wherein the pump housing provides a maintenance and / or cleaning position for the pump rotors in such a way that it is possible to quickly and temporarily bring the pump rotors into the maintenance and / or cleaning position, in particular for cleaning the pump rotors.

Description

[0001] Rotor pump arrangement and system with such

[0002] Description

[0003] Field of the invention

[0004] The present invention relates to a system prepared for processing a material strip, in particular the improvement of an extruder for plasticizing and extruding in particular a rubber mixture supplied in the form of at least one material strip, a rotor pump arrangement, a retrofit kit for retrofitting an existing system and a method for cleaning or servicing the pump rotors of a rotor pump arrangement.

[0005] Background and general description of the invention

[0006] Rubber and silicone processing, for example, presents rubber and tire manufacturers with major challenges every day. What's required is the highest level of product quality while simultaneously increasing cost-effectiveness. The roll-ex® extrusion system developed by UTH offers an innovative solution for particularly gentle processing and has thus become the global benchmark for the fine screening of rubber compounds. See, for example, patents DE 10 2006 027 896 B4 and EP 0 839 630 B1 from the applicant's company.

[0007] Fine straining is the term used to describe the fine filtration of rubber or silicone compounds. Impurities are retained in the sieve and thus removed from the material. Depending on the quality of the compound and the sieve width, this process requires pressures of several hundred bar. This has been proven to improve the quality of the material. The straining of rubber compounds is one of the main applications for gear pump extruders. In particular, high-quality products such as those used in the automotive sector, membrane technology, tire production, etc. require very clean compounds. The volumetric conveying method of the gear pump used can generate a uniform and synchronous material flow - independent of the back pressure.

[0008] With throughputs of up to 10,000 kg / h, the gear extruder and strainer solutions are optimally designed for operation in larger mixing lines, whereby the modular combination options of gear pump and a two-roll feeding unit (TRF) or a conical twin-screw extruder (DSE) enable integration into a wide variety of line concepts.

[0009] A particular problem in the operation of a typical rubber and / or silicone processing plant is that the interior of the plant has to be cleaned repeatedly, for example when the material is changed or at set intervals, in order to prevent contamination. The materials used are extremely tough and difficult to access in awkward areas, so that this type of cleaning process is labor-intensive and can entail a significant downtime. Although the plants from the applicant's company were already designed to be comparatively user-friendly, it was recognized that there is a need to reduce the labor input and / or the downtime resulting from cleaning in order to increase the plant throughput and / or improve the plant's profitability.If the system can be cleaned more effectively, it will also be possible to open up new areas of application, such as the food industry, for the system type presented here. The object of the present invention can therefore be seen as providing a device and a method for reducing downtime associated with system cleaning in a known rubber and / or silicone processing system and / or improving the system's economic efficiency.

[0010] The present invention is based on EP 0 839 630 A1 and represents in particular a further development which can also be integrated into existing systems as a retrofit solution.

[0011] A system disclosed in the present description adapted for processing a material strip can, for example, be provided as an extruder for plasticizing and extruding the material strip. Typically, the material strip is conveyed through the system, with a rotor pump arrangement moving or conveying the material strip. The material strip typically comprises a rubber mixture, for example for tire production, or silicone. The material strip can be a cold material strip, i.e., it can typically be processed at room temperature. The system is then adapted for processing the cold material strip. For example, a cold material strip can be present if the material strip has a temperature of 50°C or less.

[0012] The system comprises the aforementioned rotor pump arrangement for conveying the material strip through the system. The rotor pump arrangement comprises a pump housing which defines a pump interior and which has at least one inlet channel on the inlet side and one outlet in the outer surface of the pump housing. The material strip is therefore conveyed into the pump interior by means of the rotor pump and / or conveyed out of the pump interior by means of the rotor pump. To apply the pumping power to the material strip, the rotor pump arrangement comprises at least two pump rotors mounted in the pump housing. Such pump rotors are particularly preferably meshing gears. During operation of the system, the pump rotors are therefore in contact with the, in particular, cold, material strip in order to convey the material strip through the system.

[0013] The pump housing provides a maintenance and / or cleaning position for the pump rotors in such a way that, in particular for cleaning the pump rotors, a rapid and temporary transfer of the pump rotors into the maintenance and / or cleaning position is possible.

[0014] For this purpose, the system preferably comprises a disengagement device for laterally disengaging the pump rotor(s) in or out of the pump housing. A pump rotor drive is provided for driving the pump rotor and for generating the pump output. The pump rotor drive is preferably arranged opposite the disengagement device.

[0015] The system can be developed in such a way that a safety device with an operating state detection of the system is included, which is designed to enable the operation of the release device only when the operating state of the system is stopped.

[0016] The present description further includes a

[0017] Rotor pump arrangement for conveying a, in particular cold,

[0018] material strip, the material strip in particular comprising a rubber mixture or silicone, by a system in particular as described above. The rotor pump arrangement comprises a pump housing which defines a pump interior, at least one inlet channel on the inlet side and one outlet in the outer surface of the pump housing and at least two pump rotors mounted in the pump housing which, during operation of the rotor pump, are in contact with the material strip in order to convey the material strip through the pump housing. A maintenance and / or cleaning position is provided for the pump rotors in such a way that, in particular for cleaning the pump rotors, a rapid and temporary transfer of the pump rotors into the maintenance and / or cleaning position is possible. The pump rotors are preferably meshing gears.

[0019] The pump housing can have at least one shaft cutout for receiving a rotor shaft. If more than one shaft cutout is provided, the shaft cutouts can overlap, so that a common shaft cutout is formed in the pump housing, through which two or more rotor shafts can pass. In a further development, the shaft cutout can be configured to form or have an external bearing for supporting the rotor shaft.

[0020] Furthermore, the rotor pump arrangement can be further developed such that at least one pump rotor is arranged in the region of the shaft cutout and / or outside the pump interior when the maintenance and / or cleaning position is assumed. The pump rotors can be removed by pushing or extending them.

[0021] At least one pump rotor can be arranged on a rotor shaft; preferably, both pump rotors are each arranged on a rotor shaft. One pump rotor can be designed as a gear. Furthermore, the pump rotor can be pressed onto the rotor shaft. It is preferred if the pump rotor is formed in one piece with the rotor shaft, for example, connected integrally to the shaft. The or each rotor shaft can have a first housing bearing arranged on a first side of the respective pump rotor and a second housing bearing arranged on a second side of the pump rotor opposite the first side for holding the rotor shaft in the pump housing.

[0022] The shaft cutout can have a first diameter, the outer bearing a second diameter, and the pump rotor a third diameter. Then, the third diameter can preferably be less than or equal to the first or second diameter. This allows the pump rotor to be inserted into the shaft cutout and, in a preferred embodiment, also to be moved through the shaft cutout.

[0023] The rotor shaft is preferably designed to be laterally displaceable for at least partially extending the rotor shaft from the pump housing. The direction of laterally displaceable movement is particularly preferably along the axis of rotation of the rotor shaft. This is typically also the axis that runs along the longitudinal direction of the rotor shaft. With such an extension direction of the rotor shaft from the working position, a rotor arranged on the rotor shaft can be transferred particularly advantageously into the maintenance and / or cleaning position.

[0024] In an advantageous embodiment, a disengagement device is provided for disengaging the pump rotor(s) from the pump housing. The disengagement device can, for example, be designed to engage the rotor shaft(s) in order to disengage them laterally from the pump housing. The disengagement device can, for example, be actuated hydraulically or pneumatically. Alternatively or cumulatively, the disengagement device disengages the pump rotor(s) from the pump interior in a linear translational movement. Further alternatively or cumulatively, the disengagement device is arranged outside the pump housing and / or fastened to the pump housing and / or is part of the pump housing.

[0025] The release device, for example, has a cover plate for covering the shaft cutouts during operation of the rotor pump. Such a cover plate can, on the one hand, prevent material from the material strip from escaping from the pump housing. On the other hand, a cover plate can also be used to even out the force distribution of the release device on the rotor shafts when withdrawing from the operating position.

[0026] Alternatively or additionally, a pull-out bridge can also be provided for disengaging the pump rotors into the maintenance and / or cleaning position. A pull-out bridge can also achieve the purpose of distributing the force to the rotor shafts. The pull-out bridge can, for example, have a shaft groove for engaging around a shaft web formed on the rotor shaft, so that the rotor shafts are disengaged when the pull-out bridge is moved by means of the disengaging device.

[0027] The release device can have a plurality of at least four, preferably six, pressure cylinders. The pressure cylinders are part of the release device in that they apply a force between the release device and the pump housing, thus disengaging the pump rotors. The pressure cylinders preferably engage the extraction bridge for uniform extraction of the pump rotors or the rotor shafts.

[0028] Furthermore, the disengaging device is preferably arranged opposite the pump rotor drive. Such an arrangement causes the pump rotor to disengage from the pump rotor drive upon actuation of the disengaging device, or the pump rotor to engage the pump rotor drive when the pump rotor drive is returned to the operating position.

[0029] The present description also includes a retrofit kit for retrofitting an existing system for disengaging pump rotors of a rotor pump arrangement, for example as described above, and / or a system, for example as described above, the retrofit kit comprising a disengagement device for laterally disengaging the pump rotor(s) in or out of the pump housing, and for providing a maintenance and / or cleaning position for the pump rotors, such that, in particular for cleaning the pump rotors, a rapid and temporary transfer of the pump rotors into the maintenance and / or cleaning position is possible. At least one pump rotor is preferably arranged in the region of a shaft cutout and / or outside the pump interior when the maintenance and / or cleaning position is assumed. The transfer of the pump rotors into the maintenance and / or cleaning position is brought about by pushing or extending it.The release device is further designed for attachment to a pump housing and / or is designed as part of the pump housing.

[0030] The present description also includes a method for cleaning or servicing the pump rotors of a rotor pump arrangement, in particular as described above, for a system for processing a material strip comprising in particular a rubber mixture or silicone, in particular as described above, the method comprising the steps of stopping the system operation or ensuring that the system operation is stopped, disengaging the pump rotors by means of a disengaging device into a maintenance and / or cleaning position, in particular manually cleaning or servicing the pump rotors, re-engaging the pump rotors by means of the disengaging device into an operating position and restarting the system for continued operation.

[0031] In the following, the invention is described in more detail using exemplary embodiments and with reference to the figures, wherein identical and similar elements are partly provided with the same reference numerals and the features of the various exemplary embodiments can be combined with one another.

[0032] Short description of the figures It shows :

[0033] Fig. 1 Side view of a rotor pump arrangement, in operating position,

[0034] Fig. 2 Side view of a rotor pump arrangement, in the partially disengaged state,

[0035] Fig. 3 Side view of a rotor pump arrangement, in maintenance and / or cleaning position,

[0036] Fig. 4 Sectional view through part of a rotor pump arrangement with release device, Fig. 5 System with rotor pump arrangement,

[0037] Fig. 6 Flowchart.

[0038] Detailed description of the invention

[0039] Fig. 1 shows a first embodiment of a

[0040] Rotor pump arrangement 2. The pump rotors 6, 8 are arranged in a meshing position in the interior 3 of the pump housing 4, and the drive wheel 10 is connected to the pump drive 20. A strip of material introduced through the inlet 5 is grasped by the pump rotors 6, 8 and conveyed through the rotor pump arrangement 2 or the system 1. A release device 30 is provided on the pump housing 4.

[0041] The rotor shafts 12, 14 extend into the release device 30, where they are held in the support plate 34. Either a single-piece rotor shaft 12 or a multi-part rotor shaft 12 can be provided, or the rotor shaft 12 can be extended by adding a release projection to reach into the release device 30. A cover plate 36 is provided to cover a shaft cutout 22 in the pump housing 4.

[0042] The release device 30 is flange-mounted to the outside of the pump housing 4 by means of a frame 31 via a flange 33. The frame 31 can also serve as an abutment or plain bearing, or simply as a support for the support plate 34, so that the latter can be held perpendicular to the main direction of extension of the rotor shafts 12, 14. The support plate 34 can be connected to the rotor shafts 12, 14 or a corresponding release projection, or can encompass them, so that a longitudinal movement of the support plate 34 away from the pump housing 4 also moves the rotor shafts 12, 14.

[0043] With reference to Fig. 2, the rotor pump arrangement 2 is shown in a partially disengaged position, wherein the cover plate 36 has already closed up to the support plate 34 and the shaft bearings 16, 18 have been disengaged from the pump housing 4. The first shaft bearings 16, 18, which during operation are typically inserted with an exact fit into a shaft cutout 22 in the pump housing 4, are therefore already completely withdrawn from the pump housing 4 in the partially disengaged position and are thus spaced apart from the pump rotors 6, 8. Depending on the design of the disengagement device, the partially disengaged position enables maintenance and / or cleaning of the shaft bearings 16, 18 and the rotor shafts 12, 14 in the region of the bearing seat. The shaft bearings 16, 18 are disengaged on the rotor shaft 12, 14 separately from the rotor shaft 12, 14 and from the pump rotors 6, 8.

[0044] This also allows, for example, re-greasing of the shaft bearings 16, 18 for maintenance.

[0045] The partially disengaged position 110 is assumed in a first disengagement step 105 from the operating position 100. To assume the partially disengaged position 110, the disengagement device 30 is subjected to force in step 102, so that a partial disengagement takes place. Partial cleaning 104, for example, of the outer shaft bearings 16, 18 and a region of the rotor shafts 12, 14, can take place in this process.

[0046] With further reference to Fig. 3, the rotor pump arrangement 2 is shown in a maintenance and / or cleaning position 120. In this case, the rotor shafts 12, 14 are disengaged compared to the partially disengaged position 110 and also the operating position 100, wherein in the case shown the pump rotors 6, 8 also dip into the shaft cutout 22. Shaft bearings 16, 18 and cover plate 36 extend further so that the essential areas of the rotor shafts 12, 14 as well as the pump rotors 6, 8 and the shaft bearings 16, 18 are accessible for maintenance and / or cleaning. If necessary, a partial disassembly of the rotor pump arrangement 2 can also take place in the maintenance and / or cleaning position 120, if this is intended.

[0047] Fig. 4 shows a simplified partial sectional view of the rotor pump arrangement 2 and in particular of the release device 30 so that the operating principle can be explained in more detail. On the extensions of the rotor shafts 12, 14, which are either part of the rotor shafts 12, 14 or correspond to a release projection, there are arranged rotating drivers 44, 44A which are held by or in the support plate 34 or encompassed. For example, the driver 44, 44A is a rotating web arranged on the respective rotor shaft 12, 14 and which, depending on the function it performs, can be referred to as a driver plate or driver 44, 44A. The support plate 34 thus acts as a force distribution unit or stroke equalizer, since by means of the support plate 34 the individual stroke of the respective rotor shaft 12, 14 is adjusted to the other rotor shaft(s) 12, 14 and, if necessary,Minimal force deviations can be compensated for via the support plate 34. The support plate 34, as a stroke equalizer, thus introduces a forced synchronization of the rotor shafts 12, 14 in the extension direction.

[0048] The release device 30 can be supported on the pump housing 4 by a multi-part frame 31 (e.g., with frame parts 30A, 30B, 30C, and 30D). The support plate 34 and / or the cover plate 36 can be guided in slide rails 52. In order to achieve the most homogeneous force distribution possible across the support plate 34 and thus onto the rotor shafts 12, 14, four (or six) force distributors 54 can be provided, two (or three) on each side and arranged symmetrically around the two points of application of the rotor shafts. It is possible to provide the force distributors 54 themselves as hydraulic cylinders, which generate the force to move the components of the rotor pump arrangement into positions 100, 110, 120. For this purpose, the force distributors 54 can be supported on the frame cover part 30E. For this purpose, the force distributors 54 can be designed as pressure cylinders with an internally running piston and, for example, have hydraulic connections 40, 42 at both ends.On the other hand, the force distributors 54 can also be merely connecting bolts that apply the force evenly to the cover plate 36. In this case, for example, the frame parts 30A, 30B, 30C, 30D can be designed to be movable, in particular as hydraulic cylinders, so that the extension movement is induced thereby. Finally, there is a further possibility of using a drive function in the area of ​​the slide rails 52. For example, the slide rail 52 can be designed not as a slide rail 52 but as a rack or the like, and a rack drive can be installed in the area of ​​the support plate 34, so that the extension is thereby accomplished.

[0049] Fig. 5 shows an overview of a section of a system 1, wherein the installation position of the rotor pump arrangement 2 in the system 1 is illustrated. In systems 1, a strip of material 60 is typically moved through the system 1, wherein transport is sometimes made possible via material rollers 62. In the area of ​​the rotor pump arrangement 2, the strip of material 60 is finely strained, wherein, as explained at the beginning, a comparatively high pressure has to be overcome. In this area, the material feed for the strip of material 60 is provided by the rotor pump arrangement 2. With each material change or at set intervals, the rotor pump arrangement 2 is cleaned, for which purpose a substantial part of the system 1 may have to be dismantled. Furthermore, it has been shown that material residues can remain in the area of ​​the pump rotors 6, 8, which can contaminate the material following downstream.Therefore, particularly careful and at the same time rapid cleaning and / or maintenance of the rotor pump arrangement 2 is advantageous.

[0050] Finally, Fig. 6 shows an embodiment of a flow chart for moving the release device 30. From the operating position 100, the release device 30 can, for example, first be moved into a partially disengaged position 110 in the disengagement step 105. During or at the beginning of the disengagement step 105, a force 102 is applied to the release device 30, causing it to move. With the application of force 102 or at the beginning of the disengagement process 105, a first partial cleaning 104 can take place. A partially disengaged position 110 can then be assumed, in which initial maintenance and / or cleaning work can be carried out. The partially disengaged position 110 can also be reached, for example, only after the maintenance and / or cleaning position 120 has been assumed, in other words when the disengaging device 30 is moved back 125 into the operating position 100.When the corresponding work has been carried out in the partially disengaged position 110, the disengaging device 30 can be moved further with step 115 into the maintenance and / or cleaning position 120, in which other areas of the rotors 6, 8 or rotor shafts 12, 14 can be cleaned.

[0051] It will be apparent to those skilled in the art that the embodiments described above are to be understood as examples and that the invention is not limited to them, but can be varied in numerous ways without departing from the scope of the claims. Furthermore, it is clear that the features, regardless of whether they are disclosed in the description, the claims, the figures, or otherwise, also individually define essential components of the invention, even if they are described together with other features. In all figures, the same reference symbols represent the same objects, so that descriptions of objects that may only be mentioned in one figure or at least not in all figures can also be applied to these figures and embodiments, with respect to which the object is not explicitly described in the description. List of reference symbols

[0052] 1 system

[0053] 2 rotor pump arrangement

[0054] 3 Pump interior

[0055] 4 pump housing

[0056] 5 Enema

[0057] 6 Pump rotor (gear), drive side

[0058] 8 Pump rotor (gear)

[0059] 10 drive pins

[0060] 12 Rotor shaft

[0061] 14 Rotor shaft

[0062] 16 shaft bearings

[0063] 18 shaft bearings

[0064] 19 opposite shaft bearing

[0065] 20 drive unit

[0066] 22 wave cutout

[0067] 30 release device

[0068] 30A to 30D frame part

[0069] 30E frame cover part

[0070] 31 frames

[0071] 32 support posts

[0072] 33 flange

[0073] 34 Support plate

[0074] 36 Cover plate

[0075] 40 Hydraulic connection

[0076] 42 Hydraulic connection

[0077] 44 Shaft web, driver

[0078] 44A Shaft web, driver

[0079] 52 slide rail

[0080] 54 power distributors

[0081] 60 material strips

[0082] 62 material rolls

[0083] 100 operating positions

[0084] 102 application of force 104 partial cleaning

[0085] 105 Disengagement into partially disengaged position 110

[0086] 110 partially disengaged position

[0087] 115 Disengagement into maintenance and / or cleaning position 120 120 Maintenance and / or cleaning position

[0088] 125 Return to operating position

Claims

Patent claims:

1. System (1) prepared for processing a material strip (60), in particular an extruder for plasticizing and extruding the material strip, the material strip in particular comprising a rubber mixture or silicone, the system comprising a rotor pump arrangement (2) for conveying the material strip through the system with a pump housing (4) which defines a pump interior (3), at least one inlet channel (5) on the inlet side and an outlet in the outer surface of the pump housing, at least two pump rotors (6, 8) mounted in the pump housing, which are in contact with the material strip during operation of the system for conveying the material strip through the system, wherein the pump housing provides a maintenance and / or cleaning position (120) for the pump rotors, such that in particular for cleaning the pump rotors an at least temporary transfer of the pump rotors into the maintenance and / or cleaning position is possible.

2. System (1) according to the preceding claim, further comprising a disengaging device (30) for laterally disengaging the pump rotor(s) (6, 8) in or out of the pump housing (4), and / or a pump rotor drive (20) for driving the rotor pump arrangement (2) and for applying the pump delivery rate, wherein the pump rotor drive is arranged in particular opposite the disengaging device.

3. System (1) according to one of the preceding claims, further comprising a safety device with an operating state detection of the system, which is designed to enable the operation of the release device (30) only when the operating state of the system is stopped.

4. Rotor pump arrangement (2) for conveying a material strip (60), the material strip in particular comprising a rubber mixture or silicone, through a system (1), in particular according to one of the preceding claims, comprising a pump housing (4) which defines a pump interior (3), at least one inlet channel (5) on the inlet side and an outlet in the outer surface of the pump housing, at least two pump rotors (6, 8) mounted in the pump housing, which are in contact with the material strip during operation of the rotor pump for conveying the material strip through the pump housing, wherein a maintenance and / or cleaning position (120) is provided for the pump rotors, such that a rapid and temporary transfer of the pump rotors into the maintenance and / or cleaning position is possible, in particular for cleaning the pump rotors.

5. Rotor pump arrangement (2) according to the preceding claim, characterized in that the pump rotors (6, 8) are meshing gears.

6. Rotor pump arrangement (2) according to one of the preceding claims, the pump housing (4) having at least one shaft cutout (22) for receiving a rotor shaft (12, 14).

7. Rotor pump arrangement (2) according to the preceding claim, the shaft cutout (22) forming or comprising at least one external bearing for supporting the rotor shaft (12, 14).

8. Rotor pump arrangement (2) according to one of the preceding claims, characterized in that at least one pump rotor (6, 8) is arranged in the region of the shaft cutout (22) and / or outside the pump interior (3) when the maintenance and / or cleaning position (120) is assumed, and / or that the removal of the pump rotors (6, 8) takes place by pushing or extending.

9. Rotor pump arrangement (2) according to one of the preceding claims, characterized in that at least one pump rotor (6, 8) is arranged on a rotor shaft (12, 14), preferably both pump rotors are each arranged on a rotor shaft, the rotor shaft having a first housing bearing (16, 18) arranged on a first side of the respective pump rotor and a second housing bearing (19) arranged on a second side of the pump rotor opposite the first side for holding the rotor shaft in the pump housing.

10. Rotor pump arrangement (2) according to one of the preceding claims, wherein the shaft cutout (22) has a first diameter, the outer bearing has a second diameter, and the pump rotor (6, 8) has a third diameter, and wherein the third diameter is less than or equal to the first or second diameter.

11. Rotor pump arrangement (2) according to one of the preceding claims, wherein the rotor shaft (12, 14) is designed to be laterally displaceable for at least partial Push the rotor shaft out of the pump housing (4).

12. Rotor pump arrangement (2) according to one of the preceding claims, further comprising a disengaging device (30) for disengaging the pump rotor(s) (6, 8) from the pump housing (4).

13. Rotor pump arrangement (2) according to the preceding claim, wherein the disengaging device (30) is actuated hydraulically or pneumatically and / or wherein the disengaging device (30) disengages the pump rotor(s) (6, 8) in a linear translational movement from the pump interior (3).

14. Rotor pump arrangement (2) according to one of the preceding claims, wherein the release device (30) is arranged outside the pump housing (4) and / or is fastened to the pump housing and / or is part of the pump housing.

15. Rotor pump arrangement (2) according to one of the preceding claims, wherein the release device (30) has a cover plate (36) for covering the shaft cutout(s) (22) during operation of the rotor pump.

16. Rotor pump arrangement (2) according to one of the preceding claims, further comprising a pull-out bridge (34) for disengaging the pump rotors into the maintenance and / or cleaning position (120).

17. Rotor pump arrangement (2) according to the preceding claim, wherein the pull-out bridge (34) has a shaft groove for engaging around a shaft web (44) formed on the rotor shaft (12, 14), so that when the pull-out bridge is moved by means of the release device (30), the Rotor shafts are also disengaged, and / or wherein the disengaging device (30) has a plurality of at least four, preferably six, pressure cylinders (54), wherein the pressure cylinders act in particular on the extraction bridge (34) for uniform extraction of the rotor shafts (12, 14).

18. Rotor pump arrangement (2) according to one of the preceding claims, wherein the disengaging device (30) is arranged opposite the pump rotor drive (20), so that the pump rotor (6, 8) disengages from the pump rotor drive upon actuation of the disengaging device or wherein the pump rotor engages the pump rotor drive.

19. Retrofit kit for retrofitting an existing system (1) for disengaging pump rotors (6, 8) of a rotor pump arrangement (2) according to one of the preceding claims and / or a system (1) according to one of the preceding claims, the retrofit kit comprising a disengaging device (30) for laterally disengaging the pump rotor(s) in or out of the pump housing (4), and for providing a maintenance and / or cleaning position (120) for the pump rotors, such that, in particular for cleaning the pump rotors, a rapid and temporary transfer of the pump rotors into the maintenance and / or cleaning position is possible, such that the transfer of the pump rotors into the maintenance and / or cleaning position takes place by pushing or extending, and wherein the disengaging device is designed for attachment to the pump housing and / or is designed as part of the pump housing.

20. Method for cleaning or servicing the pump rotors (6, 8) of a rotor pump arrangement (2), in particular according to a of the preceding claims, for a plant (1) for processing a material strip (60) comprising in particular a rubber mixture or silicone, in particular according to one of the preceding claims, the method comprising the steps Stopping the plant operation or ensuring that the plant operation is stopped, Disengagement of the pump rotors using a disengagement device (30) into a maintenance and / or cleaning position (120), manual cleaning or maintenance of the pump rotors, Re-engaging the pump rotors into an operating position (100) by means of the release device, restarting the system for continued operation.

Images