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Specific measures to solve side wall wear of melt pump

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  The volume loss of the melt pump is inevitable in the process of transportation, which mainly includes:

(1) leakage of the axial clearance (that is, the end clearance of the gear).

(2) Leakage of radial clearance.

(3) Leakage of gear meshing point.

(4) Elastic loss in liquid compression.

  The axial clearance of the melt pump refers to the clearance between the end face of the gear and the side plate or the end face of the bearing. The melt leaking through this clearance flows into the bearing chamber and returns to the inlet side. Because there are many ways of axial clearance and the length of sealing liquid is short, the leakage of the axial clearance accounts for 70-80% of the total leakage, so reducing the leakage of the axial clearance plays a decisive role in reducing the volume loss and improving the volume efficiency. In high and medium pressure melt pumps, it is common to use hydraulic automatic compensation structure with axial clearance.

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