Real-time monitoring system to determine wear of grate ribs in semi-autogenous mills, to detect clogging conditions of the grates during the operation and to detect working conditions under direct impact of the balls on the grates

摘要

A real-time monitoring system to monitor the wearing in the thickness of the ribs (5) of a grate (1) of a SAG mill (9) due to the abrasive action of the ore pulp residing inside the mill and due to the action of the grinding elements during the operation, and which in certain cases also generates obstruction of the slots (4) due to the jamming of said grinding elements inside the slots (4) while the mill is running, and said grate (1) has a screening surface (2) that includes a pulp lifter (3) and an external surface (7) that is not exposed to impacts, and also includes a central trough (6) where the supporting elements fit and which allow securing the grate inside the mill through fitting bolts (12), wherein said system includes: a sensor (16) located on the external surface (7), and said sensor (16) is connected to a sensor adaptor unit (17); a wireless transmitter (18) connected to said sensor (16), and said transmitter transmits the signal from the sensor (16); a wireless receiver (20) receiving the signal from the wireless transmitter (18); and a signal reader (21) connected to said wireless receiver (20) which processes the signals received from the accelerometer. The sensor (16) can be an accelerometer or a strain gage.

主权项

1. A real-time monitoring system to monitor wearing in thickness of ribs (5) of a grate (1) of a semi-autogenous (SAG) mill (9) due to abrasive action of tore pulp residing inside the mill and due to action of the grinding elements during operation of the mill, and which in certain cases also generates obstruction of slots (4) due to jamming of said grinding elements inside the slots (4) while the mill is running, and said grate (1) has a screening surface (2) that includes a pulp lifter (3) and an external surface (7) that is not exposed to impacts, and also includes a central trough (6) where the supporting elements fit and which allow securing the grate inside the mill through fitting bolts (12), WHEREIN said system includes:
a sensor (16) placed on the external surface (7) of said grate (1); a wireless transmitter (18) connected to said sensor (16), wherein said transmitter outputs a signal from the sensor (16); a wireless receiver (20) for receiving the signal from the wireless transmitter (18); a signal reader (21) connected to said wireless receiver (20) to process signals received from the sensor; a ball (26) for use in the mill (9) for impacting the ribs (5) of the grate (1) to produce a vibration that is registered by a sensor (16) which transmits a signal to the wireless transmitter (18), and the wireless transmitter outputs the signal that is received by a wireless receiver (20) that is connected to a signal reader (21); recording means for recording the signal using the signal reader (21); and correlating means for correlating the signal with the ribs thickness (5); whereby the ball (26) cooperates with the ribs (5), sensor (16) wireless transmitter (18), recoding means, and correlating means as indicated above for calibrating the real-time monitoring system to monitor wearing in the thickness of the ribs of the grate (1) of the mill (9).