| 摘要 |
The present invention relates to an automatic monitoring device comprising a duct 5, which is used for measuring the level and concentration of the pulp in the chamber for a flotation device, two double pipes 6,7 being connected to a differential pressure converter 13 connected up to a flow control duct and correction unit 16 for a frothing agent, which correction unit is also connected to a pressure converter 14 connected to the pipe 6. The pipes 6,7 are placed in hydrostatic pipes 8,9 outside the chamber 1, which are connected to the chamber at different levels in relation to the pulp level. The output in the correction unit 16 is connected up to a flow control circuit 21 for water and frothing agent, which circuit forms part of a stablization duct 20 for the pulp level and the output of which is connected up to an operating valve 23, the said output generating a signal in response to the deviation pertaining to an increase in the pulp level from a set value. A flow converter 25 for water and frothing agent is connected up to a control circuit 26 for controlling the rate of discharge for gangue, which control circuit forms part of the duct 20 and the output of which control circuit is connected up to the drive mechanism 29 for an operating valve 30, the said output transmitting a signal in response to the deviation in the flow velocity of the water and frothing agent from a set value. <IMAGE>
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