Vacuum net belt drying machine with double-layer heating plates

Abstract

The invention discloses a vacuum net belt drying machine with double-layer heating plates. The vacuum net belt drying machine comprises a drying bin, net belt conveyors, heating devices, a vacuum unit, discharge valves, a feeding hopper, an air guide pipe, material stirring plates and material guide plates. One end of the air guide pipe is fixedly connected with an air outlet of the drying bin; and the other end of the air guide pipe is fixedly connected with the vacuum unit. The discharge valves are mounted at a feeding port and a discharge port of the drying bin. Upper-layer conveying beltsof the net belt conveyors pass through spaces between upper heating plates and lower heating plates of the heating devices. Heat energy inlets and heat energy outlets are formed in the heating plates,and guide plates are arranged in the heating plates. Heat-conducting media carrying heat energy carry out heat conduction and dissipation on materials on the upper-layer conveying belts through the upper heating plates and the lower heating plates, the heat conversion efficiency is high, and the losses are low, so that the heat conduction speed and the heat exchange speed are high, and the effective usage rate of heat energy conduction and exchange is high. The materials on the conveying belts are stirred by the material stirring plates under a conveying inertia effect of the conveying belts,so that the drying efficiency of the materials is improved, and the drying effect of the materials is optimized.

Description

technical field [0001] The invention relates to a vacuum mesh belt dryer, in particular to a vacuum mesh belt dryer with double-layer heating plates. Background technique [0002] The vacuum mesh belt dryer is a continuous operation vacuum drying equipment. The current main heating method of the vacuum mesh belt dryer is to put hot water, water vapor mixture or other flowing heating medium into the heating plate under the conveyor belt. On the conveyor belt, the conveyor belt carries the materials through each heating zone in turn at the set speed, and the heating medium (steam, hot water) in the heating plate below the conveyor belt transfers heat to the materials on the conveyor belt through the heating plate, and the material absorbs The heat evaporates the water, and the water vapor is sucked away by the vacuum system, and the dried material is discharged out of the drying chamber, and the whole drying process is carried out in the vacuum chamber. [0003] Since the hea...

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Problems solved by technology

[0003] Since the heating plate of the traditional vacuum mesh belt dryer uses heat conduction to provide heat to the material, this heating plate can only be installed close to the bottom of the upper conveyor belt, and the heat conduction of the lower heating plate (materials on the upper conveyor belt Upper surface) In the later stage of drying, due to the one-sided contact of the material with the heat medium (conveyor belt), the drying rate of the material on the upper surface is slow, and the materials on the upper conveyor belt are dried by static transportation stacked together, which will cause uneven drying of the material and affect The drying effect of the material

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