Secondary slide block core pulling mechanism for plastic mould

Abstract

The invention relates to a secondary slide block core pulling mechanism for a plastic mould. The secondary slide block core pulling mechanism comprises an upper compound plate and a lower compound plate, wherein the upper compound plate is connected to a fixed mould plate; a mould foot and a top plate are mounted on the lower compound plate; an ejector rod is mounted on the top plate; a moveable mould plate is mounted on the mould foot; and a mould cavity is formed between the fixed mould plate and the moveable mould plate; a molded plastic part is arranged in the mould cavity. The mechanism is characterized in that an I-shaped block is mounted on the lower compound plate; an external slide block is mounted on the I-shaped block; the external slide block is inserted into the inner wall of the molded plastic part; an internal slide block is arranged inside the external slide block; a compression spring and a pushing rod are mounted in the external slide block; the pushing rod is connected to the internal slide block; a mould-locking block is mounted in the fixed mould plate; a slope A and a slope B are respectively arranged at two sides of the mould-locking block; the slope A is in contact with the external slide block; the slope B is in contact with the moveable mould plate; and the external slide block is driven to pull outwards by virtue of a cylinder. A secondary slide block core-pulling mode is adopted in the scheme and the slide block is operated while the mould opening operation is performed, thereby shortening the core-pulling time, increasing the production efficiency, prolonging the service life of the mould and saving the cost.

Description

technical field [0001] The invention relates to a secondary sliding block core-pulling mechanism of a plastic mold, which is mainly applied to a plastic mold with a relatively long inner bend of 90° in a drainage plastic part and cannot be demolded normally by using a rotating slide block. Background technique [0002] In the injection mold, the 90° elbow with a relatively long inner bend in the drainage pipe needs to be designed with a rotating and outward drawing mechanism, but some products have a relatively long inner bend, which is easy to strain the product during the mold opening process, and may even be damaged during the mold closing process. Bruise the cavity. The traditional design method for this kind of plastic parts is: the outer slider is driven by the oil cylinder to pull out the straight part, and then another oil cylinder is used to drive the outer slider to rotate along the inner curved arc to eject the product. However, this solution has the following di...

AI Technical Summary

Problems solved by technology

However, this solution has the following disadvantages: 1. Multiple oil cylinders are required, and the cost is high; 2. In the injection molding process, there is a requirement for the core-pulling sequence; 3. The rotation cycle is long, which affects work efficiency; 4. The quality of the product is flawed. ; 5. The service life of the mold is short; 6. Difficulty in rotating the slider

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