Multi-ejection type injection molding mold ejection mechanism with main oil cylinder and auxiliary oil cylinder

Abstract

The invention discloses a multi-ejection type injection molding mold ejection mechanism with a main oil cylinder and an auxiliary oil cylinder. A plurality of ejection rods are uniformly arranged between a movable mold plate and an ejection plate. The multi-ejection type injection molding mold ejection mechanism further comprises the ejection oil cylinders connected with the ejection plate. The ejection oil cylinders comprise the auxiliary ejection oil cylinder and the main ejection oil cylinder. An auxiliary ejection piston rod of the auxiliary ejection oil cylinder is a barrel type piston rod. The inner diameter of the auxiliary ejection piston rod is larger than the diameter of a main ejection piston rod of the main ejection oil cylinder. The auxiliary ejection piston rod and the main ejection piston rod are coaxial. Besides, the main ejection piston rod is arranged in the auxiliary ejection piston rod. The length of the main ejection piston rod is larger than that of the auxiliary ejection piston rod. According to the multi-ejection type injection molding mold ejection mechanism with the main oil cylinder and the auxiliary oil cylinder, the main ejection piston rod is arranged in the auxiliary ejection piston rod, so that a product in a mold is rapidly ejected by means of intermittent movement of the auxiliary ejection piston rod and the main ejection piston rod, and the ejection force is large and is applied uniformly.

Description

technical field [0001] The invention relates to the technical field of mold processing, in particular to a multi-top injection molding top mold mechanism with two stages of primary and secondary oil cylinders. Background technique [0002] The ejector mechanism is an important part of the injection molding machine for accurate and reliable ejection of products. Most of the existing injection molding machines adopt single-cylinder direct-push top mold mechanism and main and auxiliary top mold mechanism. For example, the prior art discloses a main and auxiliary multi-top injection molding top mold mechanism, such as figure 1 , 2 As shown, the ejector plate 6' is connected with the ejector rod passing through the movable formwork 1', the movable formwork 1' is provided with ribs 3', the ribs 3' are parallel to the main body of the movable formwork 1', and the ejector plate 6' is located between the rib plate 3' and the main body of the movable formwork 1', the support rod 5'...

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Problems solved by technology

[0003] The above-mentioned top mold mechanism has the following defects: (1) the number of oil cylinders is large, and the installation of the oil circuit is complicated; (2) the installation of the auxiliary ejector cylinder needs to avoid the setting of the formwork, so that the formwork needs a strong rigidity, which leads to an increase in the weight of the formwork, making the The load of the rib plate is too heavy, which affects the running accuracy of the movable formwork; (3) The force on the ejector plate is uneven, and the pressure difference of the auxiliary ejector cylinder is different, resulting in uneven force on the ejector plate, and the rigidity of the ejector plate needs to be further strengthened. It causes the ejector plate to thicken and increase in weight; (4) It is not suitable for injection machines with small spacing, fewer mold cavities, and longer preforms

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