The core moving part of the high-temperature melt pump is the gear assembly. On the one hand, the rotation and meshing of the gear can squeeze the melt between the teeth, so that materials can be transported from one end to the other. On the other hand, the meshing of the gear can close the low-pressure chamber, which is conducive to improving the output pressure. Gear components of high-temperature melt pump include spur gear, helical gear and herringbone gear. Spur gears and helical gears are easy to manufacture, but the self-cleaning property of spur gears is poor, and pressure fluctuations will occur at higher speeds; Although the helical gear overcomes the problems of poor self-cleaning and pressure fluctuation, it inevitably generates a large axial force during operation, which not only aggravates the wear of the gear shaft and sliding bearing, but also leads to serious shear of the trace melt on the tooth side, affecting the quality of the final plastic products. In order to make the axial force of the high-temperature sheet extrusion melt pump balance and run smoothly under heavy load, the better structural gear is herringbone gear.
At present, the usual way to process a herringbone gear assembly is to process two helical gears and a gear shaft respectively. After processing, the two helical gears are heated to 300 degrees Celsius at the same time by the interference static fit between the gear hub and the gear shaft, and then installed at the specific position of the gear journal. The heat shrinkage of the gear hub is used to connect the two helical gears into a herringbone gear assembly. For the material and treatment of the gear shaft of the high-temperature melt pump, the gear shaft material selected by Zhengzhou Batte high-temperature melt pump manufacturer should not only meet the load generated by the materials conveyed by the high-temperature melt pump, but also consider that the pump can work continuously at a high temperature of 300 degrees Celsius. The ideal material is 38CrMoAl forged steel after quenching and tempering heat treatment. In order to improve the wear resistance and fatigue resistance of the gear shaft and improve its reliability, After machining, it shall be subject to salt bath soft nitriding surface treatment. info@battemachinery.com
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