Device for machining the drying cylinders of a paper machine

Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof

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Details

409178, 409199, 51241S, B24B 2102

Patent

active

047793830

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a device by means of which the shell surfaces of the drying cylinders in a paper machine can be machined and particularly ground without having to detach the drying cylinders from the paper machine. It is of advantage to use this kind of device when a worn, dirty, or otherwise uneven shell surface of a drying cylinder is to be repaired by machining.
It is known to carry out grinding by means of a method wherein a separate body beam is mounted beside the drying cylinder, and the body beam is provided with guide rails on which a grinder secured on a displacing carriage is supported for the grinding of the shell surface of the drying cylinder. The repair grinding is difficult to carry out by means of this method, because the body beam must be steady, whereby it of necessity is heavy and the mounting thereof is both laborous and difficult. Further, the apparatus itself is very difficult to fasten on the object to be ground. The repair grinding of the shell surface of the drying cylinder thus takes plenty of time, and is difficult to carry out.
Finnish Patent Specification No. 822,448 discloses a grinder the body of which is formed e.g. by a felt roll on an adjacent drying cylinder to which guide rails are attached by means of clamp frames, magnets or some other fastening means, by virtue whereof the grinder is light and the mounting thereof is fairly easy to carry out. However, bringing the device into working order is accurate work, wherefore it often takes plenty of time, too.
Further, the prior art methods and devices for grinding a drying cylinder are disadvantageous in that the wire must be removed from the drying cylinder in order that the grinding could be carried out, which lengthens the highly costly downtime of the paper machine.
The object of the novel machining device according to the invention is to eliminate the above-mentioned disadvantages. For the achievement thereof the invention is characterized in that the carriage comprises a frame carriage which is provided with supporting elements by means of which the frame carriage is supported both on a drying cylinder of the paper machine and on a second cylinder of the paper machine between said cylinders when the device is in operation.
By virtue of the device according to the invention the grinding work can be carried out easily and rapidly, whereby the paper machine has to be put out of operation only for a short period of time.
The invention will be described in detail in the following by means of one preferred embodiment thereof with reference to the attached drawings, wherein
FIG. 1 illustrates the machining device in a side view, i.e. perpendicularly to the longitudinal axis of the drying cylinder, and
FIG. 2 illustrates the machining device in a partial sectional view seen in the direction of the longitudinal axis of the drying cylinder.
In FIGS. 1 and 2 the frame carriage of the machining device is indicated generally by the reference numeral 1. An abrasive belt grinder (a stone grinder is also possible) operated by a motor 2 is positioned within the frame carriage 1 and indicated generally by the reference numeral 3. The position of the abrasive belt grinder 3 can be adjusted by means of a horizontal carriage 4 and a vertical carriage 5, and the both carriages are operated by their own displacing motors 6 and 7. The abrasive belt grinder 3 is attached to the horizontal carriage 4, which is displaced on guides 8 and attached to the vertical carriage 5. In the figures the frame carriage 1 is fitted between two adjacent drying cylinders 9 and 10 of the paper machine, of which cylinders the upper one 9 is exposed to the grinding operation. As appears from FIG. 1, the displacement of the frame carriage 1 in the longitudinal direction of the drying cylinder is carried out by means of a displacing motor 11 which is separate from the frame carriage, e.g. attached to the frame of the paper machine. The displacing motor 11 operates the frame carriage by means of a displacing chain 12.
The frame carriage 1 comprises two parts

REFERENCES:
patent: 1088424 (1914-02-01), Hurley
patent: 1174213 (1916-03-01), White
patent: 2461459 (1949-02-01), Wilkes
patent: 2579391 (1951-12-01), Minarik et al.
patent: 2651152 (1953-09-01), Schnuck
patent: 4575972 (1986-03-01), Ohki et al.

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