External oil cylinder pressurized injection molding machine

Abstract

The invention discloses an external oil cylinder pressure-type injection molding machine and belongs to the technical field of injection molding equipment. The external oil cylinder pressure-type injection molding machine comprises a hot-fluid channel and a channel, one end of the channel is communicated with the hot-fluid channel, the other end of the channel is communicated with a sprue gate of a mold, the middle of the channel is provided with a material storage cylinder, the outer wall of the material storage cylinder is provided with a heating device, a material pushing rod is arranged in the inner cavity of the material storage cylinder, and the tail end of the material pushing rod is provided with a power device. The external oil cylinder pressure-type injection molding machine easily realizes pressure keeping and molding of a product difficult to be pressurized and molded, is free of an expensive hot-fluid channel and reduces a cost by more than 50%. Through two-step extrusion, injection molding stability and product molding quality are improved, a hot-fluid channel service life is improved and a maintenance cost is reduced. The external oil cylinder pressure-type injection molding machine can be placed in the desired pressurized area, controls a range, guarantees mold strength and controls a molding technology.

Description

technical field [0001] The invention belongs to the technical field of injection molds, and relates to a device capable of fully extruding materials into a mold during injection molding, in particular to a pressurized injection molding machine with an external oil cylinder. Background technique [0002] At present, the injection molding process ensures that the product can be completely filled, and the product part is guaranteed to be deformed. The main realization method is the pressure maintaining function of the injection molding machine (partial pressure needs to be pressurized through the hot runner needle valve), and the pressure of the injection molding machine is aimed at the entire The pressurization of the mold, the function of injection molding and pressurization seriously affects the life of the mold, and the pressurization is directly pressurizing the entire product, resulting in uneven shrinkage of the later product and cannot be effectively controlled. The cor...

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Problems solved by technology

[0002] At present, the injection molding process ensures that the product can be completely filled, and the product part is guaranteed to be deformed. The main realization method is the pressure maintaining function of the injection molding machine (partial pressure needs to be pressurized through the hot runner needle valve), and the pressure of the injection molding machine is aimed at the entire The pressurization of the mold, the function of injection molding and pressurization seriously affects the life of the mold, and the pressurization is directly pressurizing the entire product, causing the shrinkage of the later product to be uneven and cannot be effectively controlled

The core device in injection molding equipment is the hot runner. Before the material enters the mold, it is melted through the hot runner and then injected into the mold. The cost of the hot runner for transparent products is quite high, and the technical requirements are relatively high. The price of a single piece is generally 60,000 RMB, and the hot runner system is not stable enough. It is difficult to control the heating of materials in the hot runner, which is easy to cause uneven heating. For products that are difficult to maintain pressure and difficult to form, simply use hot runners. For injection molding, it is difficult to guarantee the molding; in addition, the hot runner that needs to be kept under pressure is easily damaged, and requires frequent repairs and maintenance, and the maintenance is difficult and costly

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