Core ejection device for sand core making machine

Abstract

The invention discloses a core ejection device for a sand core making machine and relates to casting machinery. The core ejection device comprises a pass box machine pressing plate (1) of the sand core making machine, a mandril plate (2) and a mandril (5), wherein the mandril plate (2) is arranged on the lower surface of the pass box machine pressing plate (1); a compaction screw sleeve (3) is sleeved outside a rod on the upper part of the mandril (5); the middle part of the compaction screw sleeve (3) is connected with a locking nut (4); an external thread at the upper end of the compaction screw sleeve (3) is meshed with an internal thread in a hole of the mandril plate (2). The core ejection device disclosed by the invention has the characteristics of shortening the maintenance period and improving the production efficiency along with simple and compact structure, convenience in manufacturing and assembling, safety, reliability and the like.

Description

Technical field [0001] The invention relates to a casting machine, in particular to a core top device for a sand core machine. Background technique [0002] In the foundry industry, sand core machines are widely used to make sand cores. During the process of making sand cores, the sand cores must be removed from the mold. Because the used foundry sand has a certain viscosity, it is not easy to make the sand cores fall off the mold. , With the help of external force to separate the sand core, the currently used mechanism structure is inserted into the hole of the mold at the lower end of the ejector pin to withstand the sand core, and the upper end of the inverted cone is inserted into the tapered hole of the ejector plate. The pressing plate of the machine uses the power of the sand core machine to move the pressing plate of the box-through machine downwards, forcing the ejector plate and ejector rod to also move down, so that the sand core at the lower end of the ejector rod als...

AI Technical Summary

Problems solved by technology

During long-term use, the upper end of the ejector rod and the hole of the ejector rod plate are worn together, resulting in a large gap between the two, and the ejector rod swings, which is easy to damage the mold at the lower end of the ejector rod; if the lower end of the ejector rod is inserted into the damaged pit of the mold , the ejector rod breaks and hurts people, causing unsafe factors

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