Sand-injecting exhaust pinch valve of core making machine

Abstract

The invention relates to a sand-injecting exhaust pinch valve of a core making machine. The valve comprises a cylinder barrel, a piston and a piston rod, wherein the cylinder barrel is of a hollow structure, an upper cylinder cover is installed at the upper end of the cylinder barrel, an air hole communicating with an interior of the cylinder barrel is formed in the upper end face of the upper cylinder cover, a lower cylinder cover is installed at the lower end of the cylinder barrel, the lower end face of the lower cylinder cover is connected with the core making machine, a through hole communicating with the interior of the cylinder barrel and the core making machine is formed in the middle of the lower cylinder cover, a plurality of exhaust holes communicating with the interior of the cylinder barrel are formed in the outer wall of the lower portion of the cylinder barrel and evenly distributed in the circumferential direction of the cylinder barrel, a silencing barrel is arranged on the outer side of the cylinder barrel in a sleeving mode and is of a hollow structure, the lower end of the silencing barrel is connected with the core making machine through the lower cylinder cover, the piston is sleeved with the cylinder barrel, an inner cavity penetrating through the lower end face of the piston is formed in 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 penetrates through the upper cylinder cover and extends out. According to the design, the fault frequency is low, the maintenance cost is low, andthe noise reduction effect is good.

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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