The invention relates to an automatic
coal density testing device which comprises a metering unit, a
water supply unit and a sampling unit, wherein the metering unit comprises a metering
storage tank,a weighing metering part and a liquid level metering part; the weighing metering part is arranged below the metering
storage tank; the liquid level metering part is used for metering the liquid levelof the metering
storage tank; a
discharge valve is arranged at the bottom of the metering storage tank; the
water supply unit is communicated with the metering storage tank and is used for supplyingwater into the metering storage tank; the sampling unit is arranged on one side of the metering storage tank and is used for grasping a
coal sample into the metering storage tank. Due to adoption of the metering unit, the
water supply unit and the sampling unit, the automatic
coal density testing device provided by the invention is capable of automatically supplying water and taking samples, so that automatic coal density testing is achieved, and problems that a conventional automatic coal density testing device is difficult in sampling, tedious in measurement, high in cost, large in labor andtime consumption, low in
measurement precision, and the like, are solved.