A mold for producing large extruded blown plastic products

Abstract

The invention discloses a novel mould for producing large-scale extrusion blown products. The novel mould comprises a left mould, a right mould and a self-locking mechanism, wherein the self-locking mechanism comprises multiple pull rods, a long-strip-shaped left boss which is vertically arranged at the right end of the left mould, an oil cylinder, an oil cylinder sliding block, a second vertical rod, a first vertical rod which are arranged on the right mould in turn, and a long-strip-shaped right boss which is arranged on the left end of the right mould; and the an oil cylinder, the oil cylinder sliding block, the second vertical rod, the first vertical rod are arranged on the right mould. The left boss is provided with a column of clamp grooves, and the rear half parts of the pull rods are clamped in the clamp groove; the oil cylinder adopts the oil cylinder sliding block and the second vertical rod to drive the first vertical rod to move upwards; the right boss is provided with multiple pull grooves from up to down; the first vertical rod is longitudinally provided with multiple long-strip-shaped pull holes, and the left end surface of the second vertical rod is provided with multiple longitudinal sliding grooves; and when the mould is closed, clamp heads on the front end of the pull rods is inserted in the sliding grooves after penetrating through the pull grooves and the pull holes in turn, and the left tilting surface of each clamp head is matched with tilting tooth to finish the action for closing the mould. The novel mould disclosed by the invention has the advantages of reasonable structure, low cost and low power consumption, and can produce plastic products of which the surfaces are smooth.

Description

technical field [0001] In particular the invention relates to a mold for the production of large extruded blown plastic articles. Background technique [0002] In the prior art, the left mold and the right mold of the mold used to produce large extruded blown plastic products are respectively fixed on the vertical backboards on both sides, and the molds are closed in two steps, and the cooling and molding process of the product is realized through continuous hydraulic pressure in the lock. The first step is to close the mold with the pre-blowing action to evacuate the air in the mold cavity as much as possible. After the second step is to close the mold, the air sealed in the mold is compressed in the pits on the inner surface of the mold. [0003] In the prior art, both the mold opening and closing and the mold locking are realized by the same oil cylinder. Since the mold locking requires a very large pressure, the opening and closing of the mold requires a relatively larg...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, both the mold opening and closing and the mold locking are realized by the same oil cylinder. Since the mold locking requires a very large pressure, the opening and closing of the mold requires a relatively large stroke, resulting in the inner diameter and stroke of the mold opening and closing and locking cylinders being different. Larger, resulting in slow mold opening and closing speed in the production process, affecting production efficiency, and will cause relatively large energy consumption

The mold used to process large extrusion blown products is large in size and heavy in weight. During production, two molds need to be fixed on the vertical backplanes on both sides. It takes a long time to replace the mold. After the mold is fixed, the mold The bottom is suspended, which causes the entire weight of the mold and its internal cooling water to be borne by the side backplane, and the backplane base will bear a relatively large lateral moment, which will cause the two backplanes to tilt inward after a long time

At the same time, the production and processing of the backplane is more complicated, the cost is higher, and one or more large oil cylinders are required to drive the work, and the energy consumption is relatively large when producing products.

The structure of the exhaust mechanism of the mold of the large extruded blown plastic product in the prior art causes the outer surface of the produced large extruded blown plastic product to be covered with pockmarks, and its smoothness is poor, which seriously affects the appearance of the product, and it is impossible to compare with injection molding. product comparison

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