Fence device of thickener

The utility model discloses a thickener enclosure device which comprises a concentration tank, an annular overflow weir is fixedly connected to the bottom of an inner cavity of the concentration tank, a plurality of sliding grooves are formed in the inner surface of the annular overflow weir, sliding plates are slidably connected to the interiors of the sliding grooves, and floating blocks are fixedly connected to the bottoms of the sliding plates. The top of the concentration tank is fixedly connected with a marker post, the top and the bottom of the surface of the marker post are fixedly connected with fixing plates, and the opposite surfaces of the two fixing plates are fixedly connected with sensors by forming grooves; the top end of the marker post is fixedly connected with an audible and visual alarm matched with the sensor, the top of the annular flow baffle is fixedly connected with an L-shaped rod, one end of the L-shaped rod is fixedly connected with a sliding sleeve matched with the marker post, an