Patent Application
20070039184
1. Field of the Invention
The present invention relates to an apparatus for manufacturing and/or treating a material web, in particular a paper or board web, having a roll with bearing journals which are provided at the ends, a roll frame having bearings, in which the roll is mounted with its bearing journals so as to be rotatable about its longitudinal axis, and having a motor which is plugged onto a bearing journal.
2. Description of the Related Art
Rolls having plug-on motors are known. Here, the motor is usually configured as a hollow-shaft motor and is arranged on the bearing journal of the roll. A drive system of this type has, in particular, the advantage of a compact design. On the other hand, these systems have the disadvantage that the play which is necessary for assembly between the motor hollow shaft and the bearing journal of the roll widens during the course of operation, with the result that roundness and vibration problems can occur. The attempt to compensate for the assembly play by a clamping unit designed in the known manner has not proven successful for long-term disruption-free operation. The abovementioned problems also occurred here after only a short operating time.
The invention provides an apparatus of the type which is mentioned above, which apparatus firstly maintains the possibility of a compact design but secondly does not have the above-mentioned problems.
This is achieved in that the motor is clamped with respect to the bearing journal, the clamping length being at least one tenth of the length of the motor shaft.
According to the invention, it has been recognized that the problems which are depicted above can be avoided if the clamping length between the motor and the bearing journal has a defined minimum length, namely at least one tenth of the length of the motor shaft. The compact design of plug-on motors can be maintained with an arrangement of this type, without roundness or vibration problems occurring.
The minimum clamping length is preferably 1.5 tenths of the length of the motor shaft, particularly preferably two tenths of the said length. It has been possible to achieve very satisfactory results with this, with regard to roundness and vibration properties.
According to the invention, in arrangements of conventional rolls of paper machines and customary plug-on motors, the minimum clamping length is then 20 mm, preferably 30 mm and more preferably 40 mm. It has also been possible to achieve the advantages which are depicted above with this.
If a plurality of pressing faces are provided, the abovementioned minimum clamping lengths are preferably valid for each of these pressing faces. In this way, it can be ensured that roundness or vibration problems do not occur on any of the pressing faces.
According to one refinement of the invention, the motor is attached to the roll in what is known as a cantilever arrangement. The plug-on motor is seated at the end on the bearing journal of the roll. In an arrangement of this type, assembly or dismantling is particularly simple, in particular in the case of retrofitting or conversion.
According to another refinement of the invention, the motor is arranged on the bearing journal between the roll and the roll bearing. This results in a particularly stable arrangement and the possibility of a large clamping length in the interior of the plug-on motor.
In the depicted cantilever arrangement of the plug-on motor, an adapter flange is preferably provided between the motor and the bearing journal. A plug-on motor having almost any desired journal geometry can be used by the use of an adapter. The motor does not itself have to be adapted to the journal geometry, as a result of which only low costs are produced. Moreover, a relatively short journal length is sufficient to provide a plug-on motor. Standard motor sizes can therefore also be used.
In the case of the use of an adapter flange, the minimum clamping length is preferably present between the adapter flange and the bearing journal of the roll. The production of the clamping connection is particularly simple on account of the adapter flange which is small in relation to the motor.
The adapter flange can be arranged outside the motor or engage into the hollow shaft of the motor. The first mentioned arrangement is particularly simple and inexpensive, while the second arrangement makes a particularly large clamping length possible with a smaller overall size.
In particular, in the case of the cantilever arrangement of the plug-on motor and in particular in the use of an adapter flange, the clamping face is preferably formed by a press fit. A pressing action of this type can be carried out simply and can also be used inexpensively in the case of retrofitting or conversion.
According to a further refinement of the invention, the clamping face is formed by a clamping element. As a result of this refinement, particularly great clamping forces and therefore particularly stable mounting of the plug-on motor can be achieved.
The clamping element can be actuated mechanically. The clamping element is then preferably configured as an annular clamping element. Here, it is advantageous if the clamping ring can be actuated from that side of the plug-on motor which faces away from the roll.
In one special refinement of the annular clamping element, the latter has a slotted taper sleeve and a slotted taper ring which surrounds the sleeve, which can be clamped axially against one another. As a result of being clamped axially against one another, the slotted taper ring is widened and pressed against the hollow shaft of the motor, while the taper sleeve is pressed radially inwards onto the bearing journal of the shaft. This produces a particularly stable connection between the bearing journal and the hollow shaft of the plug-on motor.
A spacer ring which prevents displacement of the motor with respect to the bearing journal during clamping is preferably arranged between the taper sleeve and the hollow shaft of the plug-on motor. This makes it possible to ensure correct seating of the motor on the bearing journal in a simple manner.
According to a further refinement of the invention, the clamping element can be actuated hydraulically. As a result, particularly high clamping forces can be applied.
In particular, the clamping element can be configured as a releasable hydraulic press-fit connection. The clamping element can therefore be used as required. Here, the configuration of the press-fit connection as a taper press-fit connection has proven particularly suitable.
In particular, an electric asynchronous motor is suitable as a plug-on motor. However, other electric motors can also advantageously be used, such as an electric synchronous motor having a permanent magnet.
The invention also relates to a method for attaching a drive motor to a roll of a paper machine or for converting or retrofitting the drive of the roll.
According to the invention, the motor is clamped with respect to the bearing journal of the roll during attachment or retrofitting, at least one tenth of the length of the motor shaft being selected as the clamping length. Here, the bearing journal substantially carries the weight of the motor. The clamping length is selected in such a way that it is at least one tenth of the length of the motor shaft. In the case of defined motor sizes or power outputs, clamping lengths of 1.5 tenths of the length or, as an alternative, two tenths of the motor length are selected.
It is very advantageous, in particular in retrofitting, if the motor is attached in a cantilever arrangement. An adapter flange is attached between the motor and the bearing journal. Here, a press-fit connection or a press fit (for example, K7/m6) is realized, as a result of which only a very short bearing journal is necessary. Moreover, the journal geometry can be selected as desired. The motor itself does not have to be adapted to the journal geometry, as a result of which standard motor sizes can be used for retrofitting or conversion.
It is also very advantageous if the motor is connected to the frame of the paper machine on a torque support.
Above all, the particular advantage of the solution according to the invention consists in that the roll can remain in the machine or machine frame during conversion or retrofitting and does not have to be dismantled.
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate one preferred embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
The apparatus which is shown in
Drive motor 6 has a hollow shaft 7, to which an adapter flange 8 is fastened such that it points towards roll 1 on the end side. Adapter flange 8 has a central passage opening 9, the diameter of which is selected in such a way that adapter flange 8 is fastened with a press fit on end section 5 of bearing journal 2. Moreover, motor 6 is supported fixedly in terms of rotation with respect to roll frame 3 via a torque support 10. However, the weight of motor 6 is carried substantially by bearing journal 2. Motor 6 is therefore attached to roll 1 here in what is known as a cantilever arrangement. In particular, motor 6 is configured as an electric asynchronous motor.
The length of the adapter flange 8 and the length of section 5 of bearing journal 2 are selected in such a way that the pressing face which forms the press fit has a length l in the direction of the rotational axis I of roll 1 between adapter flange 8 and section 5 of bearing journal 2, which length l is selected in accordance with the desired minimum size of the clamping length. In particular, the clamping length l is at least one tenth, preferably at least 1.5 tenths, more preferably at least two tenths, of the length L of motor shaft 7. This results in reliable fastening of motor 6 to bearing journals 2 of shaft 1 with low or no roundness or vibration problems, even after relatively long operation. In conventional rolls 1 of paper machines and customary plug-on motors 6, the clamping length l is at least 20 mm, preferably at least 30 mm and more preferably at least 40 mm.
In the apparatus which is shown in
In this variant, hollow shaft 7 of plug-on motor 6 and bearing journal 2 are connected by a clamping element 11 which is arranged between bearing journal 2 and hollow shaft 7 of motor 6 and can be actuated from that side of motor 6 which faces away from roll 1. Clamping element 11 is formed by an annular clamping element, as is shown diagrammatically in
As can be seen in
The clamping length l which is determined by the length of taper ring 13 is particularly long, as can be seen in
In the embodiment which is shown in
In contrast to the embodiment of
As can be seen in
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| DE 102005037647.9 | Aug 2005 | DE | national |
