Blow molding device and blow molding method for plastic fuel tank

Abstract

The invention relates to a blow molding device and a blow molding method for a plastic fuel tank. The blow molding device is symmetrically provided with two sets of profile blank extrusion devices; each set of profile blank extrusion device comprises six extruders, six hoppers, six melt metering pumps, a composite distributor and a servo plane die head; the melt metering pumps are respectively arranged at the outlets of the six extruders, the melts pumped by the melt metering pumps are fused together through the composite distributor, and the fused melt is fed into the servo plane die head and extruded into left and right plane profile blanks; the left and right plane profile blanks are respectively clamped by a right half die of a left oil tank to close, and a pre-formed shim plate is clamped in the middle; a blowing needle pierces the cavities of the profile blanks to perform pre-blowing, so that the profile blanks are outwards expanded and jointed to the inner wall of the die cavity; the right half die of the left oil tank is opened, the pre-formed shim plate is moved out, and a built-in component is stuck to the inner wall of the die cavity; and the right half die of the left oil tank is newly closed, the left and right profile blanks are stuck to form an oil tank, and the cavity of the oil tank is subjected to high-pressure blowing so that the oil tank is formed. The fueltank manufactured by the method has the advantages that: leakage is reduced, and efficiency and quality of the finished product are improved.

Description

technical field [0001] The invention relates to a blow molding device for a plastic fuel tank, and also relates to a blow molding method for a plastic fuel tank, which belongs to the technical field of plastic fuel tanks for automobiles. Background technique [0002] Automobile plastic fuel tank blow molding has been widely recognized by customers for its light weight, good safety performance, corrosion resistance, impact resistance, long service life and large design freedom. [0003] The blow molding device of the existing plastic fuel tank includes a support platform, the left half mold of the fuel tank, the right half mold of the fuel tank, the clamping mechanism and the built-in mechanism of the fuel tank are arranged under the support platform, and a set of parison extrusion device is arranged on the support platform, and the parison The extrusion device includes six extruders, six hoppers, one compound distributor and one tubular parison die; the six extruders are the...

AI Technical Summary

Problems solved by technology

Since the molten parison is very soft, it enters the cutting knife completely by its own weight, and no matter how sharp the knife is, it will cause wrinkles at the cutting part of the parison, and it is easy to stick to the knife, and the distance between the two parisons after cutting is too close , easily stick together again

[0007] In addition, the existing blow molding method is controlled by weighing ingredients, and the plasticizing amount of the extruder is not stable enough; and because the molten material is pushed to the compound distributor and die head by the screw of the extruder, it will produce The reaction force is very large. Under the long-term action of the reaction force, the thrust bearing at the end of the screw shaft of the extruder is easily damaged, and the replacement is time-consuming and laborious, and the cost is high

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