EP0922921B1 - Steam-heated roller, especially for cardboard machines - Google Patents

Description

The invention relates to a steam-heated roller, in particular for corrugated cardboard machines, with those specified in the preamble of claim 1 Features. Such a roller is known from US-A-5 533 569.

Such steam-heated rollers can be used for a wide variety of purposes be used for the processing of web goods. As a typical example for this are preheating rollers or so-called "corrugated rollers" for corrugated cardboard machines to call. With such corrugated rollers, a paper web is used by working together with a counter corrugating roller in the typical Brought wave form, as can be observed with corrugated cardboard material. to The corrugating roller is known to support the corrugation of the paper web heated in temperature ranges from 180 ° to 200 ° C. this happens with saturated steam, which is in the interior of the hollow cylindrical roller body is introduced. Support the preheating rollers also mentioned the paper heating in front of the corrugating roller.

A problem with this type of roller heating is the formation of condensate on the inner wall of the roller shell. This teaches both rotating as well as stationary roller problems with itself.

When the roller rotates, a uniform film of condensate forms on the Inner wall of the cylinder jacket, which the heat transfer between the introduced saturated steam and the cylinder jacket hindered. This sets the Efficiency of saturated steam heating is considerably reduced.

When the roller is at a standstill - for example in the event of business interruptions - the condensate runs up to the inside of the cylinder jacket lowest point and it forms a so-called "Condensate swamp". This significantly reduced the bottom of the roll Heat transfer between saturated steam and cylinder jacket leads to a different heating in the area of the condensate sump on the one hand and the rolling areas not affected by this on the other hand. this in turn brings a deformation of the roller due to different thermal Linear expansion of the jacket material with itself.

To solve the above problem, the use of a so-called "Siphon tube" known. It is a pressure tight through one of the journals, statically arranged, bent pipe, that runs until just before the roller base and there is a suction opening forms. Since the siphon pipe is passed through the bearing journal and in must not be installed visible interior of the roller body is Now adjust the suction opening as close as possible to the Inner wall of the jacket extremely problematic. The smallest possible distance between the suction opening and the roller base is logical Therefore, to demand that the condensate be sucked off as completely as possible. However, the siphon tube is now mounted so that it is on the roller base abuts, it can lead to a deformation of the siphon tube and grinding come in the area of the suction opening.

A fundamental problem is also the pressure-tight implementation of the static siphon tube through the rotating journal of the steam-heated Roller.

Based on the problems described in the prior art the invention has for its object the mountability of the siphon tube, improve its adjustability and pressure-tight implementation. This According to the characterizing part of claim 1, the object is achieved by that the siphon tube from an outer, rigid support tube and one inside there is a slidably mounted, flexible insert tube. Through a relative shift The distance of the suction opening is from insert tube to support tube adjustable to the roller base.

The advantage of the construction discussed above is that outer support tube installed in a certain, uncritical mounting position can be. The adjustment can be carried out by means of the flexible insert tube take place, the z. B. up to the stop pushed onto the roller base and then a short distance - Just the desired distance between the suction opening and Roller base - can be withdrawn. The support tube remains firm in its position, with which a particularly tight implementation by the rotatable bearing pin can be achieved.

Preferred embodiments of the insert tube see its design as a corrugated metal hose. This material is for use well suited under saturated steam conditions, but shows the necessary ones Flexibility in the bending direction and immutability in length in the longitudinal direction.

The adjustability of the suction opening is further improved in that the insert tube at its inner end with a telescopic telescope in the support tube sliding nozzle is provided as another preferred Embodiment provides. The end of the support tube can be a corresponding one Have bevels so that the suction opening to the position angle the longitudinal axis at the end of the support tube is adapted. Thereby the suction opening can be adjusted so that all around uniform minimum distance is adjustable. Otherwise, the maximum angle limits the longitudinal axis of the support tube at its end the bending radius of the Support tube, because of the feasibility of a corresponding Opening in the bearing journal must not become too small.

Further subclaims relate to the pressure-tight implementation of the siphon tube through the bearing journal and the setting of the insert tube relative to the support tube for adjusting the suction opening just above the roller base. Further details and advantages are the description of the figures removable.

Fig. 1

einen vertikalen Axialschnitt durch eine Vorheizwalze einer Wellpappemaschine,

Fig. 2

eine teilweise geschnittene Darstellung des inneren Ende des Syphonrohres in seiner Montagestellung über dem Grund der Walze gemäß Fig. 1,

Fig. 3

eine teilweise geschnittene Seitenansicht des das Syphonrohr haltenden Dichtkopfes der Walze gemäß Fig. 1,

Fig. 4

eine gegenüber der Schnittdarstellung nach Fig. 3 um 90° gedrehte Seitenansicht des Dichtkopfes,

Fig. 5

eine Seitenansicht des Dichtkopfes analog Fig. 3 mit geänderten Teilschnitten, und

Fig. 6

einer Ansicht aus Pfeilrichtung VI. nach Fig. 5.

For the rest, further details and advantages of the invention can be gathered from the description which now follows, in which an exemplary embodiment of the subject of the invention is explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1

a vertical axial section through a preheating roller of a corrugated cardboard machine,

Fig. 2

2 shows a partially sectioned illustration of the inner end of the siphon tube in its assembly position above the base of the roller according to FIG. 1,

Fig. 3

2 shows a partially sectioned side view of the sealing head of the roller holding the siphon tube according to FIG. 1,

Fig. 4

3 compared to the sectional view of FIG. 3 rotated side view of the sealing head,

Fig. 5

a side view of the sealing head analogous to FIG. 3 with modified partial sections, and

Fig. 6

a view from the direction of arrow VI. according to FIG. 5.

As is clear from Fig. 1, a preheating roller, as in a Corrugated cardboard machine is used, a roll body 1 with a roll shell 2 and on the front openings welded roller flanges 3 on. The roller flanges 3 with journals 4 are central provided in a roller frame 5 with roller bearings for rotatable storage of the roller body 2 sit. The roller interior 6 is not in with saturated steam for heating the roller body 1 applied. The steam is e.g. B. introduced through the journal 4, why the outside of the siphon tube 8 to be explained Annulus is used.

For suctioning off condensate collecting on the roller base 7 the aforementioned siphon tube 8 is provided, which is pressure-tight by the Journal 4 inserted into the roller interior 6 and through his slightly curved course (see Fig. 1) ends just before the roller base 7.

As is particularly clear from Fig. 2, the siphon tube 8 consists of a outer, rigid support tube 9, in which a flexible metal corrugated hose 10 is slidably mounted. This corrugated hose 10 ends before the opening of the support tube 9 and is provided at its end with a nozzle 11, which is telescopically displaceable in the support tube 9. The support tube 9 ends with a distance A of a few centimeters above the roller base 7 and is therefore uncritical in its assembly and adjustment. The gap to Roll base 7 is bridged by the nozzle 11, the opening on free end forms the suction opening 12 of the siphon tube arrangement 8. By moving the corrugated hose 10 and thus the connector 11 in the support tube 9, the distance a of the suction opening 12 from the roller base 7 can be set exactly.

As is also clear from FIGS. 1 and 2, the support tube 9 is arcuate in this way trained that its longitudinal axis 13 at its roller inner end occupies an acute angle 14 of almost 60 ° to the roller base 7. As can be seen from FIG. 2, the suction opening 12 is in one of these Angle 14 corresponding manner beveled, so that from the front edge 15 of the nozzle 11 spanned plane parallel to that for this Purpose as the roller base to be considered essentially flat.

The course of the bending of the support tube 9 is dimensioned so that the Support tube 9 through the through opening provided centrally in the journal 4 16 can be threaded through.

1 in conjunction with FIGS. 3 to 6, the bracket and pressure-tight implementation of the static siphon tube 8 by the rotating To explain the bearing journal 4 of the roller body 1. So on that End of the bearing journal 4 facing away from the roller body 1 with an intermediate layer a sealing ring 17, a first sealing flange 18 and in turn one Screwed on mounting flange 19. Both parts are with the journal 4 coupled via fastening screws 20 and therefore rotate with. With the Sealing flange 18 is part of the sealing head 21 of the siphon tube 8 and thus static connecting sleeve 20 via a narrower sealing ring 23 in connection. The holding flange 19 is loaded with an intermediate layer a conical sliding ring 24, the connecting sleeve 22 to the sealing flange 18 out. Via sealing ring 17, sealing flange 18, sealing ring 23 and connecting sleeve 22 is the roller interior 6 and the through opening 16 sealed to the outside and to the sealing head 21.

The latter is, as can be seen from FIGS. 3, 5 and 6, via lateral extensions 25 held on two rods 26, 27, which are not shown in detail are rigidly connected to the roller frame 5. The extensions 25 are with Passages 28 provided in which sockets for receiving the two rods 26, 27 sit. Via appropriate fixing screws 30 in the extensions 25 sit and apply the rods 26, 27 via the bushings 29, the sealing head 21 can be fixed stationary in a certain position in which the connecting sleeve 22 the sealing contact to the sealing flange 18 manufactures. The two ends of the rods 26, 27 are over one Yoke 51 connected to one another by nuts 52 on rods 26, 27 is fixed.

In Fig. 3, the outer end 31 of the support tube 9 is now in one Mounting flange 32 welded position recognizable. This mounting flange 32 is via mounting screws 33 with an insert 34 in the sealing head 21 connected. This insert 34 holds the support tube 9 over a certain Length to provide adequate support.

The mounting flange 32 has a receptacle 35 on its outside a stuffing box 36, which can be acted upon by a clamping ring 37 is.

As is clear from Fig. 3, is now the outside end of the corrugated hose 10 provided with a grommet 38 through the Stuffing box 36 and the central opening of the clamping ring 37 protrudes. By acting on the stuffing box 36 by the Ring shoulder 39 on the clamping ring 37 by screwing in the clamping nuts 40 on the threaded bolt 41 fixed in the mounting flange 32 Sealing at the bushing 38. This is also the space between the outside of the corrugated hose 10 and the inside of the support tube 9 sealed to the outside.

As can be seen particularly well from FIGS. 3 and 4, the bushing is 38 provided with an adjusting device 42, by means of which the Bushing 38 and therefore the corrugated hose 10 and the nozzle 11 are displaceable in the longitudinal direction relative to the support tube 9. This adjustment device 42 sees two diametrically protruding from the bushing 38 Arms 43 in front, each with a passage opening 44 for threaded bolts 45 are provided. The latter are opposite on the clamping ring 37 the threaded bolt 41 fixed positions. On the threaded bolt 45 sit on both sides of the arms 43 fixing nuts 46 so that the in Fig. 4 shown position of the bushing 38 is fixed. Should now brought the suction opening 12 closer to the roller base 7 only the inner fixing nuts 46 (on the right in FIG. 4) solved and the bushing 38 are moved accordingly. This position can then be adjusted by tightening the outside fixing nuts 46 can be set. In a first adjustment step, the Corrugated hose 10 with its sockets 11, 38 are inserted as far as that the inner nozzle 11 with its suction opening 12 on the roller base 7 triggers. Then the entire arrangement can be pulled out a little be so that there is a small distance a of 1 to 3 mm leaves. This position can be secured by tightening the fixing nuts 46 become.

Since due to the bevel of the suction opening 12, the installation rotational position of the corrugated hose 10 must be precisely defined is an indexing device 47 in the form of an index pin 48 seated on the mounting flange 32 intended. This engages in a receiving opening 49 on the clamping ring 37 a, so that the corrugated hose 10 is never rotated in a 180 ° Location can be installed.

Finally - as can be seen from FIGS. 3 to 5 - the outer end of the Bushing 38 with a connecting flange 50 for connection provided with a condensate suction line (not shown).

Claims (8)

1. Steam heated roll, in particular for corrugating machines, comprising

   a rotatable roll body (1);

   a centric bearing journal (4) at the end of each roll body (1) for rotatably mounting the roll body (1);

   a static siphon pipe (8) which passes through one of the bearing journals (4) in a pressure sealed manner, having a supply (50) outside the bearing journal (4) and an aspiration mouth (12) on the roll bottom (7);

   characterized

   in that the siphon pipe (8) comprises an external rigid supporting pipe (9) and a flexible inserted tube (10) lodged displaceably therein; and

   in that the distance (a) of the aspiration mouth (12) from the roll bottom (7) is adjustable by displacement of the inserted tube (10) relative to the supporting pipe (9).
2. Roll according to claim 1, characterized in that the inserted tube is a corrugated metal hose (10).
3. Roll according to claim 1 or 2, characterized in that the inserted tube (10), on its end inside the roll, is provided with an aspiration port (11) which is telescopically displaceable in the supporting pipe (9).
4. Roll according to claim 3, characterized in that the supporting pipe (9) arches into the roll interior (6) such that its longitudinal axis (13), by the end, and the roll bottom (7) make an acute angle (14) of maximally 60°.
5. Roll according to claim 3 and 4, characterized in that the aspiration port (11) has an aspiration mouth (12) that is beveled corresponding to the angle (14) of the end of the supporting pipe.
6. Roll according to one of claims 1 to 5, characterized in that at its outer end, the inserted tube (10) is provided with a pass-through fitting (38), which extends out of the supporting pipe (9), pressure sealed by a packing (36).
7. Roll according to claim 6, characterized in that adjusting means (42) engage with the pass-through fitting (38) for displacement of the inserted tube (10) relative to the supporting pipe (9).
8. Roll according to claim 7, characterized in that a holder (37) for the adjusting means (42) is mountable in a defined position of rotation about the longitudinal axis (13) of the supporting pipe (9) by an indexing attachment (47).

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