Variable pitch transport chain

Abstract

The invention relates to a variable pitch transport chain which comprises hollow chain pins, wherein the chain pins are connected by chain plates; an autorotation axis is arranged in each hollow chainpin; the lower part of the autorotation axis is provided with an autorotation chain wheel, and the upper part of the autorotation axis is provided with a bottle blank supporting seat; and both sides of a transport chain are provided with annular guide rails. The variable pitch transport chain is characterized in that a chain link short pitch L1 in the same drawing and blowing unit group is smaller than a chain link long pitch L2 between the drawing and blowing unit groups; two chain links with the short pitch are connected by the short chain plate A and short chain plate B; and two chain links with the long pitch are connected by the long chain plate A and the long chain plate B. The scheme is suitable for simultaneously moulding a plurality of bottle blowing machines once and can fully and reasonably utilize a chain link space on the transport chain after the chain link pitch positioned in the same drawing and blowing unit group is shortened, thereby improving the moulding efficiency; in addition, die cavities of a moulding die correspond to bottle blanks of the same drawing and blowing unit group, after the pitch is reduced, distanc among all die cavities are also reduced, thereby saving die materials.

Description

technical field [0001] The invention relates to a conveying mechanism of a plastic hollow container stretch-blow machine, in particular to a variable-pitch conveying chain in the conveying mechanism, and belongs to the field of mechanical manufacturing. Background technique [0002] PET plastic bottles are widely used in filling various beverages, such as mineral water, juice drinks, tea drinks and dairy drinks, as well as medicine, cosmetics and other industries, which determines the broad market prospects of PET blow molding machines. PET plastic bottles are first injected with plastic raw materials into preforms by the injection molding machine, and the preforms are inserted into the preform support seat through the feeding mechanism or manually. The preform is driven by the advance type to move. The preform enters the heating zone to be heated, and then it is stretched and blown by the stretch blowing system after heating, and finally the bottle can be taken out. The pi...

AI Technical Summary

Problems solved by technology

However, for blow molding machines with one out of two, one out of three, one out of four, etc., when the cylinder drives the conveyor chain to move step by step, because the step distance is two (corresponding to one out Two blow molding machines), three or four pitches (that is, the cylinder will push the preforms into the mold in groups), if the chain link pitch in the same stretch blowing unit group is still the same as that between adjacent unit groups The pitch is the same, resulting in a waste of space (because the pitch in the same stretch-blow group only needs to meet the distance between the two cavities of the mold, it does not need to be too large); and because the number of cavities on the mold corresponds to one Group of preforms, resulting in a large distance between the cavities, thus wasting mold material

In addition, when the endless conveyor chain turns and transitions, because the existing turning guide mechanism uses the tooth plate to drive the chain links, not only the friction is relatively large, but also the installation is troublesome and the cost is high

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