FI57797C - FACILITY FOUNDATION AND RAFFINOERS DRIFTSTOERNINGAR - Google Patents

Description

Ρ55Ρη [Β] (11) ICULATION PUBLICATION c 7 7 9 7 jwa A lJ 1; UTLÄCGNINCSSKRIFT of fy f P Patent .ayLnne I by 10 10 1080 * iSvM ^ Patent meddelat ^ (51) Kv.ik.Wa3 D 21 D 1/30 FINLAND — FINLAND (21) fttMttn ^ «iw * -PMmtMrtknlnc 772109 (22) Htkemlipilvl — An * Oknlnf * d «g 05.07 · 77 ^ * (23) Alkuplhrl — Glltl * h« * d «f 05.07.77 (41) Tulkit JulklMk»! —Bllvlt offMtllg q6 01 79 juntti- J. «kl.Mrth.intu.

Patent- och rtgifterttyrtlaen 'Aratkin utta | d och utUkrlftM put> LieM-ad 30.06.Θ0 __ (32) (33) (31) Pyydvtty ituoikmt — fefftrd prloriMt (71) Yhtyneet Paperitehtaat Oy, Jylhävaara, PO Box 30, 37601

FIELD OF THE INVENTION The present invention relates to a device for reporting malfunctions of a grinding grinder.

At present, refiner malfunctions are often detected as a poor grinding result, by listening to or feeling sounds from or due to the refiner housing, or by listening to, for example, bearing sounds.

The disadvantages of such methods are the periodicity of monitoring and the uncertainty of the interpretation of the results, as well as other confounding factors.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a device which constantly monitors the operation of the refiner and notifies immediately if any changes or disturbances occur in the sharpness of the refiner.

The notification device according to the invention is characterized in that it has a vibration sensor which is connected to the grinding wheel of a grinder. The sensor thus provides an indication of a fault in the blade gap, such as contact of the blades with each other, foreign objects in the blade gap, etc.

2 57797

A preferred embodiment of the invention is characterized in that the vibration sensor is attached to the fixing and adjusting bolt of the grinding wheel. This bolt provides mainly axial vibrations to the sensor.

Another embodiment of the invention is characterized in that the vibration sensor is connected to an automation with amplifiers and display devices known per se. The intensity of the vibration from the vibration sensor is at certain levels in different situations, whereby the equipment can be automated so that it performs certain actions in each different vibration range, for example, alerting the operator to sharpen or lower, stop the refiner, etc.

The invention will now be described by way of example with reference to the accompanying drawing, in which

Fig. 1 schematically shows the grinding wheels of a grinder in an axial section.

Fig. 2 shows the mounting of the vibrating chute and the mounting bolt.

The grinder has one non-rotating grinding disc 1 opposite a second rotating grinding disc 2. The notification device comprises a vibration sensor 3 attached to a bolt 4 attached to the non-rotating grinding disc 1. If the blades of the grinding discs 5,6 come into contact changes due to bolt 4 to the vibration sensor 3. The vibration sensor can be connected in many ways to automation, which alerts the supervisor, adjusts sharply to a greater or lesser extent, stops the refiner, etc.

It will be apparent to those skilled in the art that various embodiments of the invention may vary within the scope of the claims set forth below. Thus, the vibration sensor does not necessarily have to be connected to an alarm, but it may just as well be connected to a display device which continuously indicates from the vibration coming from the refiner that the operation is smooth and normal. There can also be several vibration sensors and they can be attached, for example, directly to the blade block. The milling mill does not necessarily have to be according to the example with one non-rotating and one rotating milling disc, but can be any known milling mill.