SYSTEM FOR ONLINE MONITORING METAL ABRASIVE GRAINS IN OIL LIQUID AND MONITORING METHOD THEREFOR

摘要

A system for online monitoring metal abrasive grains in oil liquid and a monitoring method therefor. The on-line monitoring system comprises an abrasive grain sensor (3) and an oilway connected in parallel to a device oil pool. The oilway is provided with an electromagnetic valve (2) and an auxiliary oil pump (4). The abrasive grain sensor (3) comprises an electromagnetic induction apparatus and an infrared thermal imager. The oilway is disposed at an alternating magnetic field area of the electromagnetic induction apparatus. A focus of the infrared thermal imager is located on a cross section of the oilway in the alternating magnetic field area. The abrasive grain sensor (3) transmits a data signal of a monitored location to an industrial control system (5). By using the characteristic that metal abrasive grains generate an eddy in an alternating magnetic field and cause increase of a temperature on the surface, the system acquires temperature distribution data of the abrasive grains in the oil liquid by means of an infrared thermal imager, so as to obtain information about a form, granularity size distribution, a material and the like of the metal abrasive grains.