A sand-shooting exhaust pinch valve for a core making machine

Abstract

A sand-shooting exhaust pinch valve for a core making machine, including a cylinder, a piston and a piston rod. The lower end of the cylinder is equipped with a lower cylinder head, the lower end of the lower cylinder head is connected with the core making machine, the middle part of the lower cylinder head is provided with a through hole communicating with the inside of the cylinder and the core making machine, the lower part of the cylinder The outer wall of the cylinder is provided with a plurality of exhaust holes communicating with the inside of the cylinder, and the plurality of exhaust holes are evenly arranged along the circumferential direction of the cylinder. The lower cylinder head is connected with the core making machine, the piston is set in the cylinder barrel, and the piston has an inner cavity that runs through the lower end surface of the piston. The upper end of the piston is connected with one end of the piston rod, and the other end of the piston rod passes through the upper cylinder. Protrude behind the cover. This design not only has low failure frequency and low maintenance cost, but also has good noise reduction effect.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a sand-shooting exhaust pinch valve for a core making machine, which is mainly suitable for reducing failure frequency and maintenance cost. Background technique [0002] The core-making machine relies on air pressure to inject sand into the mold. The existing sand-injecting exhaust pinch valve of the core-making machine uses compressed air to press the rubber ring to seal the sand-injecting air pressure. The sand pressure pushes the rubber ring to release the sand-shooting and exhaust pressure. Each box of sand core needs to fold the rubber ring once. The higher the production output, the more high-pressure folding times. Repeated folding actions will easily cause damage to the rubber ring, resulting in a high frequency of failures; A core-making center used four such sand-shooting and exhaust pinch valves, which damaged one rubber ring every two months on average, and the rubb...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects and problems of high fault frequency and high maintenance cost in the prior art, and provide a sand-shooting and exhaust pinch valve for core making machines with low fault frequency and low maintenance cost

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