Bottom die lifting mechanism for single open die bottle blowing machine

Abstract

The invention discloses a bottom die lifting mechanism for a single open die bottle blowing machine. The bottom die lifting mechanism comprises a die frame support, a bottom die support, a first sliding block, a bottom die pull rod, a bottom die swing rod, a space connecting rod, a cam curve and a rotor, wherein the bottom die support can swing around the axis of a first shaft and is connected to the die frame support; the first sliding block is arranged on the bottom die support in a lifting mode; one end of the bottom die pull rod can rotate around the axis of a second shaft and is connected to the first sliding block; one end of the bottom die swing rod is fixedly connected to the bottom die pull rod; the two ends of the space connecting rod are hinged to the die frame support and the other end of the bottom die swing rod through spherical surfaces of knuckle bearings fixedly connected to the space connecting rod correspondingly; the cam curve is arranged on one of the bottom die support and the bottom die pull rod and is parallel to a first plane; and the rotor is arranged on the other one of the bottom die support and the bottom die pull rod and is capable of rotating around the axis of the rotor. In the rotating process of the bottom die pull rod, the rotor always abuts against the cam curve through the outer side circumferential face of the rotor. The second shaft is perpendicular to the first shaft and parallel to the rotation axis of the rotor. According to the bottom die lifting mechanism, the movement rule of a bottom die can be accurately controlled, and the dynamic load is small.

Description

technical field [0001] The invention relates to the technical field of bottle blowing, in particular to a bottom mold lifting mechanism for a single mold opening blow molding machine. Background technique [0002] Blow molding machine is the key equipment for producing plastic bottles for various liquid packaging. Each process of the bottle blowing machine has strict requirements and high requirements for mutual cooperation, especially for the synchronous control of the bottom mold swing and lifting movement of the single mold opening. [0003] In the prior art, the linkage between the bottom mold swing and the lifting motion is generally realized through a cylindrical space cam mechanism. Mechanism advantages: simple mechanism, few moving parts. Disadvantages of the mechanism: 1) The design and machining accuracy of the cam flange or groove profile of the cylindrical space cam is high, the installation and positioning of the cam is difficult, and the rotor is easily stuck...

AI Technical Summary

Problems solved by technology

Disadvantages of the mechanism: 1) The design and machining accuracy of the cam flange or groove profile of the cylindrical space cam is high, the installation and positioning of the cam is difficult, and the rotor is easily stuck; 2) The contact surface between the rotor and the cylindrical space cam profile is easy to form Point contact, large compressive stress, easy damage to the rotor or easy wear on the cam surface; 3) limited by the space size, usually the pressure angle of the cam in the cylindrical space is too large, similarly, the rotor is easy to damage or the cam surface is easy to wear

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