FIBER TREATMENT ORDER

Description

[0001] The invention relates to an arrangement for the mechanical treatment of aqueous suspended cellulose fibers between two treatment plates forming a treatment gap, rotating relative to each other and arranged coaxially to each other, which are arranged in a closed housing with an inlet and an outlet for the fiber suspension.

[0002] It has long been known to mechanically treat cellulose fibers, i.e., virgin pulp and / or recycled paper fibers, in particular to grind or disperse them, in order to achieve the desired properties in the resulting fiber web, especially with regard to strength, formation and surface.

[0003] The refiners typically used in this process have treatment plates with a multitude of grinding bars, also called knives. The treatment plates themselves are each formed by several grinding sets. The refiners can be designed as disc refiners or conical refiners.

[0004] In contrast, the treatment plates of the Disperger have ring-shaped, concentrically arranged rows of teeth.

[0005] To achieve the desired fiber properties, the treatment plates must be adapted to the fiber material being treated as best as possible, also to prevent excessive wear of the same.

[0006] Due to the high drive power required, the components involved are subject to high stress and therefore also to high wear. In addition, the space required for this process must be taken into account.

[0007] A double-disc refiner is known from EP0 831 171 A2. For driving a drive shaft, one end of the drive shaft is connected to a motor via a coupling. The drive shaft 5 is supported by the coupling.

[0008] A refiner is known from US 3,129,898. Bearings are provided on both sides of the motor for supporting the drive shaft.

[0009] A fabric decongestant is known from DE 3808765 A1. In this decongestant, a feed and compression screw, a stator assembly, a rotor disk (the latter with a gap axially opposite the stator assembly), and an outlet on the housing of the fabric decongestant section are arranged in a housing in the following sequence. A bearing for the rotatably driven disk is provided. The drive motor is preferably an electric motor. The object of the invention is therefore to simplify the design of such arrangements.

[0010] According to the invention, the problem was solved by mounting rotating treatment plates in the housing and connecting them via a drive shaft to a gearbox or drive located outside the housing, wherein the drive shaft has no bearing of its own or is only mounted outside the housing.

[0011] By separately mounting the rotating treatment plates, the load on the drive shaft can be significantly reduced, which in turn affects its design and bearing arrangement. As a result, the required space and the corresponding manufacturing costs are substantially reduced.

[0012] This in turn allows the drive shaft to be mounted only outside the housing.

[0013] The simplest way to achieve this is to make the drive shaft one piece with an axle of the gearbox or drive.

[0014] Eliminating the need to support the drive shaft in the housing simplifies the design.

[0015] Alternatively, direct bearing support can be completely dispensed with for the drive shaft.

[0016] For the transmission of the driving force, the gearbox or drive should advantageously have a drive pin for the force- or form-fit reception of the corresponding end section of the drive shaft designed as a hub, or a drive hollow shaft for the force-fit reception of the corresponding end section of the drive shaft.

[0017] To absorb the forces exerted by the rotor on the housing via its bearings, the housing should be supported on a foundation. Likewise, the gearbox and / or drive should be supported on a foundation, preferably the same one.

[0018] Depending on the type of treatment and the specific requirements, the treatment surfaces of the treatment plates can run perpendicular to the axis of rotation or conically to the axis of rotation.

[0019] It is also possible that the housing contains several treatment slots. In this case, to fully utilize the advantages of the invention, the rotating treatment plates of the treatment slots should be driven via a common drive shaft.

[0020] The invention is applicable to arrangements with at least one treatment gap for grinding the fibers or at least one treatment gap for dispersing the fibers.

[0021] The invention will now be explained in more detail using several exemplary embodiments. The accompanying drawing shows: Figure 1 : a longitudinal section through a conventional grinding arrangement; Figure 2a-c: a longitudinal section through various grinding arrangements according to the invention with gear 8 and drive 9; Figure 3 : a detailed longitudinal section through a grinding arrangement and Figure 4 : a top view of housing 4 of the grinding arrangement.

[0022] In the closed housing 4 of the grinding arrangement, there are, by way of example, two treatment gaps 1 running perpendicular to a rotation axis 15 in the form of grinding gaps, each formed by a stationary treatment plate 2 connected to the housing 4 and a treatment plate 3 rotating around the rotation axis 15.

[0023] The circular and coaxially arranged grinding surfaces of the two treatment plates 2,3 of a grinding gap run parallel to each other, with the distance between them usually being adjustable.

[0024] Between the two treatment plates 2 anchored in the housing 4 are the two rotating treatment plates 3.

[0025] The rotating treatment plates 3 are, according to the invention, arranged in accordance with the Figures 2 to 4 They are rotatably mounted in housing 4 and are driven by a common drive shaft 7.

[0026] To simplify the design, the two rotating treatment plates 3 are arranged according to Figure 1 , as is known per se, attached to a common disc 16 of the drive shaft 7.

[0027] The grinding surfaces are each formed by a multitude of essentially radially extending grinding bars and the grooves between them.

[0028] In the example shown here, the fiber suspension to be ground enters one of the two treatment slots 1 between the two grinding surfaces via an inlet 5 through the center. The fiber suspension passes radially outwards across the interacting grinding surfaces and collects in the subsequent annular space 17.

[0029] While at least part of the fiber suspension treated in this way leaves this annular space 17 through a drain 6, the other part of the fiber suspension may, under certain circumstances, flow back through the grooves of the non-rotating grinding surface along a section of its length.

[0030] Only hinted at are in Figure 1 the means known per se by which a force is generated to press the two grinding plates 2,3 against each other.

[0031] The cross-section of the grinding bars, also called blades, is generally rectangular, although other shapes exist. The upper surface of these grinding bars, i.e., the surfaces bearing the grinding edges, lies in the radial plane.

[0032] The grooves running between the grinding bars also have a rectangular cross-section and serve as flow channels for the fiber suspension. The groove depth is usually between 2 and 20 mm.

[0033] The drive shaft 7 is driven via a gearbox 8, for example in the form of a spur gear or planetary gearbox, by an electric drive 9, wherein gearbox 8 and drive 9 are arranged outside the housing 4.

[0034] Since the rotating treatment plates 2 are rotatably mounted in the housing 4, the drive shaft 7 does not require a bearing in the housing 4, which significantly simplifies the design of the grinding arrangement.

[0035] The Figures 2 a to cshow different design options for coupling the drive shaft 7 with the gearbox 8.

[0036] At Figure 2c The drive shaft 7 of the grinding assembly is integrally formed with an axle 10 of the gearbox 8. This means that the drive shaft 7 is only supported in the gearbox 8 and thus transmits hardly any radial forces.

[0037] Alternatively, it is also possible that the drive shaft 7 does not have its own bearing.

[0038] This is according to Figure 2b for example, this is possible by the gearbox 8 having a drive pin 11 for the frictional engagement of the corresponding end section of the drive shaft 7, which is designed as a hub 12.

[0039] In a different version accordingly Figure 2aThe gearbox 8 has a hollow drive shaft 13 for the force- or form-fit reception of the corresponding end section of the drive shaft 7. If axial forces are also to be transmitted, this is possible by means of a suitable shape, for example with a shoulder shape.

[0040] As a result, in all versions the gearbox 8 takes over the complete bearing function for the drive shaft 7 of the grinding arrangement.

[0041] The housing 4, as well as the gearbox 8 and the drive 9, are supported on a common machine foundation 14.

[0042] In addition to the grinding surfaces of the treatment plates 2,3 shown here, which run perpendicular to the axis of rotation 15, a conical shape of the grinding surfaces is also possible, as with the conical refiner.

Claims

1. Arrangement for mechanically treating aqueously suspended cellulose fibres between two treatment plates (2, 3) which form a treatment gap (1), rotate relative to one another, are coaxial with one another and are arranged in a closed housing (4) with an inflow (5) and an outflow (6) for the fibre suspension, wherein rotating treatment plates (2, 3) are mounted in the housing (4) and connected via a drive shaft (7) to a transmission (8) or drive (9) outside the housing (4), characterized in that the drive shaft (7) does not have a dedicated mounting.

2. Arrangement for mechanically treating aqueously suspended cellulose fibres between two treatment plates (2, 3) which form a treatment gap (1), rotate relative to one another, are coaxial with one another and are arranged in a closed housing (4) with an inflow (5) and an outflow (6) for the fibre suspension, wherein rotating treatment plates (2, 3) are mounted in the housing (4), characterized in that the treatment plates are connected via a drive shaft (7) to a transmission (8) outside the housing (4) and the drive shaft (7) is only mounted outside the housing (4).

3. Arrangement according to Claim 1 or 2, characterized in that the drive shaft (7) is formed in one piece with an axle (10) of the transmission (8) or a drive (9).

4. Arrangement according to Claim 1 or 2, characterized in that the transmission (8) or a drive (9) has a drive pin (11) for force-lockingly holding the corresponding end portion, in the form of a hub (12), of the drive shaft (7).

5. Arrangement according to Claim 1 or 2, characterized in that the transmission (8) or a drive (9) has a hollow drive shaft (13) for force-lockingly or form-fittingly holding the corresponding end portion of the drive shaft (7).

6. Arrangement according to one of the preceding claims, characterized in that the housing (4) is supported on a base (14).

7. Arrangement according to one of the preceding claims, characterized in that the transmission (8) and / or a drive (9) is supported on a base (14).

8. Arrangement according to one of the preceding claims, characterized in that the treatment faces of the treatment plates (2, 3) extend perpendicularly in relation to the axis of rotation (15).

9. Arrangement according to one of Claims 1 to 7, characterized in that the treatment faces of the treatment plates (2, 3) run conically towards the axis of rotation (15).

10. Arrangement according to one of the preceding claims, characterized in that the housing (4) contains multiple treatment gaps (1).

11. Arrangement according to Claim 10, characterized in that the rotating treatment plates (2, 3) of the treatment gap (1) are driven via a common drive shaft (7).

12. Arrangement according to one of the preceding claims, characterized in that the treatment gap (1) serves to refine the fibres.

13. Arrangement according to one of Claims 1 to 11, characterized in that the treatment gap (1) serves to disperse the fibres.