A positive displacement pump, working on the drive gear and the driven gear are engaged with each other due to the volume change of the melt conveying. The volume of work by the pump body, the alveolar gear and bearing functions with side structure. When the gear rotates, the melt that is inhaled into the alveolar cavity of the two gears, along with the rotation of the melt was brought into the discharge from both sides of the cavity, gear meshing teeth again, so that the melt is out of the discharge chamber, pressure to the export pipeline. The bearing lubricant can not be used normally, in order to avoid the pollution is usually used to melt, melt self lubrication.
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