Sand shooting system

Abstract

The invention relates to the technical field of precoated sand molding devices and discloses a sand shooting system. The sand shooting system comprises a sand shooting plate and a plurality of sand shooting nozzle modules arranged on the sand shooting plate in an array mode. Each sand shooting nozzle module comprises a three-way valve body provided with a sand inlet channel, a sand outlet channeland a sand return channel and a rotary valve element arranged in the three-way valve body and used for channel switching. A movable sand outlet pipe assembly is connected to an outlet of each sand outlet channel. Each three-way valve body is provided with a linear motion execution element and a rotational motion execution element. Each linear motion execution element is connected with the corresponding mobile sand outlet pipe assembly. Each rotational motion execution element is connected with the corresponding rotary valve element. The sand shooting system can improve the precoated sand molding efficiency. The device manufacturing cost is reduced. Meanwhile, the automation degree of precoated sand molding operation is improved. The sand shooting operation reliability is improved.

Description

technical field [0001] The invention relates to the technical field of coated sand molding process equipment, in particular to a sand shooting system. Background technique [0002] In the molding process of coated sand, it is necessary to use a sand shooting system to shoot sand in the cavity of the mold. During molding, under the action of the compressed air of the sand shooting system, the coated sand is ejected from the sand shooting nozzle of the sand shooting system, passes through the sand shooting plate and enters the cavity of the mold to complete the molding of the coated sand. [0003] The sand shooting system in the prior art has the following problems during use: [0004] One is that the sand shooting plate in the sand shooting system is a special part, which is connected with the mold and serves as a diversion channel for the molding sand (coated sand) during sand shooting. Therefore, the sand shooting plate needs to be fed according to the different sand holes...

AI Technical Summary

Problems solved by technology

[0004] One is that the sand shooting plate in the sand shooting system is a special part, which is connected with the mold and serves as a diversion channel for the molding sand (coated sand) during sand shooting. Therefore, the sand shooting plate needs to be fed according to the different sand holes on the mold. Different molds need to be equipped with different shooting boards. On the one hand, it increases the manufacturing cost of the shooting boards. On the other hand, frequent replacement of the shooting boards when performing coated sand molding for various molds also makes the production Efficiency drops

[0005] The second is that after sand shooting, some molding sand will fall on the mold, which needs to be cleaned manually with a scraper. On the one hand, the degree of automation of manual cleaning is low, and the efficiency and quality of cleaning are also poor. On the other hand, due to the high mold temperature High, manual cleaning has potential safety hazards

[0006] The third is that the retractable nozzle at the front end of the sand nozzle in the existing sand shooting system is a spring compression structure, which uses the force of the spring to make the nozzle and the sand shooting plate close, because the compression force of the spring is relatively small , Fatigue will also occur after long-term use, which may lead to a decrease in reliability under high-pressure sand shooting conditions, and there may be air or sand leakage at the close contact between the nozzle and the sand shooting plate, which will accelerate the sealing of the front end of the sand shooting nozzle Cushion wear

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