Lifting and returning device of lower ejecting core plate

Abstract

The invention discloses a lifting and returning device of a lower ejecting core plate. The lifting and returning device comprises lifting rods, lifting rod locking nuts and returning springs, wherein each lifting rod comprises a bolt head and a screw rod and can penetrate through the lower ejecting core plate in a sliding manner, the bolt head stops at the bottom surface of the lower ejecting core plate, and the screw rod is fixedly arranged in a lower core box in a penetrating manner; the lifting rod locking nut is adaptively screwed with one end of the screw rod, extending out of the lower core box; the returning spring is arranged on the screw rod of the lifting rod in a penetrating manner; the upper end of the returning spring is butted with the bottom surface of the lower core box and the lower end of the returning spring is butted with the top surface of the lower ejecting core plate. The lifting and returning device disclosed by the invention has the advantages that the structure is simple and reasonable; the returning device is arranged between the lower core box and the lower ejecting core plate, and the lower ejecting core plate can be automatically returned in time, so that the operation of a core box mold is stable, the core manufacturing efficiency is high, the core manufacturing quality is good and the service life of the mold is long.

Description

technical field [0001] The invention relates to the field of core box molds, in particular to a hoisting and resetting device for a lower top core plate. Background technique [0002] The core box mold is the most commonly used mold in casting molds, and its function is to make sand cores in the casting production process. The core box mold is generally installed on the core shooting machine and works in coordination with the core shooting machine. Its main structure generally includes an upper core box, a lower core box, a sand shooting system and an ejection system. The ejection system is usually divided into upper ejection system, lower ejection system and side ejection system. [0003] Among them, the lower ejection system includes the lower core plate, the lower core rod, the return guide rod, the boom and so on. In the current ejection system for the lower part of the core box mold, the thrust of the equipment is only responsible for lifting the lower core plate, not...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a simple and reasonable structure, which can be automatically reset in time, so that the core box mold runs stably, the core-making efficiency is high, the core-making quality is good, and the service life of the mold is long. The lower top core plate of the core box mold cannot be reset in time, which shortens the service life of the mold and seriously affects the core-making efficiency of the mold

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