Extrusion die head die lip opening automatic fine-adjustment structure provided with independent air cooling structure

Abstract

The invention provides an extrusion die head die lip opening automatic fine-adjustment structure provided with an independent air cooling structure. The extrusion die head die lip opening automatic fine-adjustment structure comprises an upper die body, a lower die body, an upper die lip and a lower die lip. The front side surface of the upper die body is connected with an upper fine-adjustment fixing seat and a lower fine-adjustment fixing block which are arranged in the width direction through screws correspondingly. The outer surface of the front side of the upper die body is provided with aplurality of expansion rods which incline in the length direction of the upper die body and are distributed uniformly in the width direction of the upper die body correspondingly. The upper portionsof the expansion rods are fixed into the upper fine-adjustment fixing seat, and the lower portions of the expansion rods are fixed into the lower fine-adjustment fixing block. The lower ends of the expansion rods abut against the upper die lip through fine-adjustment drag hooks correspondingly. Thermal insulation plates are arranged between the expansion rods and the upper die body, between the expansion rods and the upper fine-adjustment fixing seat, and between the expansion rods and the lower fine-adjustment fixing block correspondingly. Heating rods are arranged in the expansion rods correspondingly, the tail portions of the heating rods are connected to a junction box, the exteriors of the expansion rods are sleeved with air pipes which are in clearance fit with the expansion rods, and the air pipes are independently connected to an air chamber. By means of the extrusion die head die lip opening automatic fine-adjustment structure provided with the independent air cooling structure, the expansion rods can be cooled fast and effectively, and a discharging clearance between the upper die lip and the lower die lip is fast adjusted.

Description

technical field [0001] The invention relates to an extrusion die head, in particular to an automatic fine-tuning structure for the lip opening of the extrusion die head with an independent air cooling structure. Background technique [0002] The fine-tuning structure of the discharge gap of the die lip of the extrusion die is very important for the uniformity of the thickness of the extruded product. An automatic fine-tuning scheme designed in the early stage adjusts the output of the upper and lower die lips by heating the heating rod to cause the thermal expansion and contraction of the expansion rod. The size of the material gap, but the structure is complicated, and disassembly is very troublesome. It is necessary to disassemble the related parts of the automatic fine-tuning to disassemble and replace the heating rod, and the cooling of the expansion rod mainly depends on natural cooling, and the reaction speed is slow. Contents of the invention [0003] In view of the...

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Problems solved by technology

[0002] The fine-tuning structure of the discharge gap of the die lip of the extrusion die is very important for the uniformity of the thickness of the extruded product. An automatic fine-tuning scheme designed in the early stage adjusts the output of the upper and lower die lips by heating the heating rod to cause the thermal expansion and contraction of the expansion rod. The size of the material gap, but the structure is complicated, and disassembly is very troublesome. It is necessary to disassemble the relevant parts of the automatic fine-tuning to disassemble and replace the heating rod, and the cooling of the expansion rod mainly depends on natural cooling, and the reaction speed is slow.

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