Opening-closing device for plastic drawing-blowing machine pipe taking tongs

Abstract

The present invention relates to a switching device for the wrench for taking pipe of the plastic drawing and blowing machine, which comprises a support, a rolling disc arranged on the support, drawing and blowing machines for a plurality of working positions arranged on the rolling disc, the drawing and blowing machines for each working position is provided with a wrench for taking pipe, the wrench is driven by the inner and outer reciprocating movement mechanism, the sliding bar head of the wrench is provided with left and right tong heads which are provided with gear teeth respectively, a pushing bar is arranged on the sliding bar and is connected with rack at the head part, the rack meshes with the gear teeth of the tong head, an ejector cam is arranged at the end part of the pushing bar and contacts with the offsetting spring of the sliding bar, the spring is provided with a cover plate, the left and right tong heads are provided with jaws respectively, the jaw contacts with the plastic bottle tube. The present invention is characterized in that the left and right tong heads are respectively provided with tong rams, roller is arranged on the tong ram, guide rail is arranged on the support, the roller contacts with the guide rail.

Description

technical field [0001] The invention relates to an opening and closing device for pipe tongs of a plastic stretch blowing machine, belonging to the field of plastic machinery. Background technique [0002] Hollow plastic containers are processed by injection stretch blowing, such as mineral water bottles, oil bottles, etc. First, the plastic raw materials are injected into bottle tubes by injection molding machines, and then the bottle tubes are put into heaters for heating, and then stretched and blown by stretch blowing machines. Molded. There are many types of existing heaters and stretch-blow machines. There is a type of heater and multi-station stretch-blow machine that is suitable for plastic bottle nozzles facing upwards and can transport bottle tubes in translation. For example, heated plastic bottle tubes are released from the heater The bottle tube is taken out by the teeth of the edge of a middle dial, and the middle dial rotates with the b...

AI Technical Summary

Problems solved by technology

The pipe-taking tongs of the prior art, one class is driven by the cylinder, and the opening and closing of the pipe-taking jaws will be difficult to achieve; The middle of the gear teeth is driven by a rack, and the rack is driven by a swing mechanism. Not only is the structure complex, it takes up a lot of space, and it is generally only suitable for single-station stretch blowing machines. At the same time, there are left and right jaws with the same length. , it is not conducive to taking the tube during rotation

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