Check valve for rubber injection molding

Abstract

The invention relates to a valve and discloses a check valve for rubber injection molding. The check valve comprises a valve body. The valve body is connected to an injection molding barrel and arranged between a threaded rod and an air cylinder. A valve seat is arranged in the valve body, and a valve element is arranged on the valve seat. A valve rod penetrating the valve body is connected to the valve element, and symmetric striker plates are hinged to the portion, below the valve element, of the valve body. Elastic parts are arranged between the two striker plates and the valve body, and the sum of the lengths of the two striker plates is larger than the caliber of the valve body. Compared with the prior art, when the air cylinder squeezes plastic, due to the check valve, part of the plastic is prevented from being squeezed on the threaded rod; and the plastic cannot apply acting force to the threaded rod, damage to the threaded rod is reduced, and the service life of the threaded rod is prolonged.

Description

Technical field [0001] The invention relates to a valve, in particular to a one-way valve for rubber injection molding. Background technique [0002] There are many plastic molding methods, but the injection molding method is the most common. Especially in recent years, the continuous research and improvement of molding machines have changed from manual, semi-automatic to fully automated. However, due to the different nature of the molding process, there must be various There are a variety of different forms of forming machines to adapt to different working conditions. Even in the same specifications of forming machines, the forms will vary due to different designs of various manufacturers. [0003] Under normal circumstances, the basic structure of a general-purpose injection molding machine includes three parts, namely the injection device, the clamping device (mold clamping and demoulding device), and the hydraulic transmission and electrical control system. The injection device...

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Problems solved by technology

[0004] The injection devices that can meet these requirements mainly include plunger type, plunger-screw type, screw type, etc. Among them, the screw type injection device includes an injection molding cylinder, which is connected with a hopper, and a screw 12 is provided inside the injection molding cylinder. The left side of the injection molding cylinder is provided with a cylinder 11, such as figure 2 As shown, when the screw 12 transports the plastic to the cylinder 11, when the amount of plastic reaches a certain amount, the screw 12 stops rotating, starts the cylinder 11, and the cylinder 11 injects the plastic into the mold, and because the screw 12 is adjacent to the cylinder , when the cylinder is extruding plastic, part of the plastic will be extruded on the screw 12 and exert pressure on the screw 12, causing damage to the screw 12 and reducing the service life of the screw 12

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