FI80335C - Plant for monitoring the condition of layers in a paper machine - Google Patents

Description

! 80335

EQUIPMENT FOR MONITORING THE CONDITION OF PAPER MACHINE BEARINGS -ANLÄGGNING FÖR ÖVERVAKNING AV KONDITIONEN AV LAGER I EN PAPPERSMASKIN

The invention relates to an apparatus for monitoring the condition of the bearings of a paper machine, which apparatus comprises vibrations or the like placed in connection with the bearings to be monitored. monitoring sensors connected to the monitoring device.

10 At present, the condition of paper machine bearings is usually monitored centrally by a computer that reads the readings of the monitoring sensors mounted on the bearings alternately, e.g., every 0.5 h, 1 h, 2 h, or 4 h, or at some other time interval. One computer can then monitor, for example, the condition of several hundred bearings, and each bearing can thus be monitored only for a short time, e.g. 0.1 to 0.5 min. Due to the short monitoring time, occasional oscillation signals of the bearing, e.g. caused by a metal particle and occurring only infrequently, e.g. occasionally 20, are not detected at all during the monitoring period or cannot be taken into account due to their randomness and sparse number. However, a disturbance, e.g. said metal particle, may later cause damage to the bearing to begin, eventually destruction of up to 25 bearings. Thus, the methods and equipment currently in use are not suitable for detecting anomalies and defects that are difficult to detect in the condition of bearings.

It is an object of the present invention to obviate the above drawbacks. In particular, it is an object of the invention to provide a device for monitoring the condition of the bearings of a paper machine, by means of which damage threatening the condition of the bearings can be detected at an earlier stage, preferably when damage damaging the condition of the bearings occurs.

It is a further object of the invention to provide a device with which the condition of the bearings of a paper machine can be monitored continuously and, in addition, inexpensively and inexpensively and centrally.

With regard to the features characteristic of the invention, reference is made to the claims.

5 In this specification and requirements, the term paper machine means the actual machine used for making paper as well as machines used for paper finishing, coating, calendering, etc. By paper is meant conventional thin paper, paperboard and / or other web-like products made of wood fibers.

The invention is based on the basic idea that the condition of the monitored bearings is continuously monitored by recording the signals of the monitoring sensors continuously. In this case, occasional vibrations, e.g. caused by metal particles in the bearings, can be registered and can be taken into account in monitoring the condition of the bearing.

The registration of the signals from the bearing monitoring sensors is preferably performed by converting the signals to a digital format, e.g. by means of analog-to-digital converters, and by registering the signals converted to digital form by means of digital counters. The digital counters can advantageously be monitored by means of a monitoring device, such as a computer. When using the computer 25, signals deviating from the signal levels corresponding to the good condition of the bearings can be taken into account immediately when deviating signals occur.

The invention will now be described in detail by way of an exemplary embodiment with reference to the accompanying drawing, which shows in a simplified diagrammatic view an apparatus according to the invention for monitoring the condition of paper machine bearings.

Figure 1 shows schematically the rolls 8, 81, 8a, 83 of the paper machine 7 with their bearings 1, 35, 11, 12, 13, 1 °. Bearings 1 ° to 13 are provided with vibration sensors 2, 21, 22, 23; only the vibration sensors placed in connection with the bearings at the ends of the lower rollers ti 3 80335 are shown in the figure in order to simplify the structure, and the second bearings 1 ° of the rollers are also provided with corresponding vibration sensors. The condition of the bearings 1 ° to 13 can then be monitored by means of vibration sensors by continuously monitoring the condition of the bearings to be monitored and continuously recording the signals of the monitoring sensors so that the signals sent by the monitoring sensors deviate from the good signal level of each bearing. good condition can be taken into account immediately when ao signals and deviations occur. In this case, it is precisely thanks to the continuous monitoring of the condition of the bearings that intermittent, occasional and small damage to the condition of the bearings can be detected and taken into account during maintenance work.

In the figure, the signals of the monitoring sensors 2 to 23 are fed to the analog-to-digital converters 5, 51, 5a, 53 and the digital signals given by them are further fed to the digital counters 3, 31, 33, 33. by means of a microprocessor, and the monitoring device is arranged to monitor the condition of each bearing to be monitored continuously. The monitoring device 4 may form or may be connected to a central computer controlling the process control 25, such as a central control unit 6, suitably arranged to continuously register the signals given by the monitoring sensors and to indicate signals deviating from the signal level corresponding to the good condition of the bearings immediately.

The digital counters used in the presented application are very inexpensive and can continuously monitor the signals transmitted by the monitoring sensor of each bearing to be monitored in a simple manner. In addition, digital counters can be easily connected to a monitoring device 4, a computer 6 or the like.

The monitoring sensors 2 can be, for example, vibrating sensors, they can be arranged to detect breaks in the bearing lubricating oil film, the bearing speed or some other quantity that predicts bearing damage.

Instead of the counters 5 connected to the monitoring device 4 used, it is possible to use conventional analog detection, the signals of which are fed to the monitoring device, i.e. e.g. to a microporsor.

The device according to the invention is suitable not only for monitoring the rollers, but also for bearing the bearings of other parts of the paper machine.

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Claims (1)

5 80335 CLAIMS Apparatus for monitoring the condition of paper machine bearings (1), comprising vibration or similar monitoring sensors (2) located in connection with monitored bearings 5 and connected to a monitoring device (4), characterized in that the apparatus includes a digital converter (5) ) arranged to convert the signals from the monitoring sensors (2) into 10 digital formats; a digital counter (3) arranged to register the received digital signals; and a central control unit (6) arranged to continuously register the signals given by the monitoring sensors (2) and to indicate signals deviating from the signal level corresponding to the good condition of the bearings immediately upon the occurrence of the respective signals or deviations. 6 80335 Anläggning för vövervakning av londitionen av lager (1) i en pappersmaskin, vilken anläggning innefat-5 tar i samband med lagren son skall övervakas placerade vibrations- e.d. overturning devices (2), in which case the overturning device (4), the signaling means and the digital signaling device (5), and the anomalous operation of the signal-free signal (2) ; en digitalräknare (3), som är anordnad att Registrera de erhällna digitalsignalerna; ooh en centralstyrenhet (6), som är anordnad att Registrera de av övervaknings-givarna (2) avgivna alarmerna kontinuerligt ooh meddela 15 de signaler som avviker frän den signalnivä som motsva-rar condition with a light on the other side of the signal or on the other side of the signal. (I