A casting raw sand screening device

Abstract

The invention provides a casting raw sand screening device. The technical problems of low screening efficiency, poor screening effect and the like in the existing screening technology are solved. Thecasting raw sand screening device comprises a sand crushing device and a sand filtering device, and is characterized in that the sand crushing device comprises a first vibrating disc, the first vibrating disc comprises a first disc body, a first spiral track is fixed on the inner wall of the first disc body, a plurality of conical protruding parts are uniformly distributed on the top surface of the first spiral track, sand rises along the first spiral track, and agglomerated sand is crushed by the protruding parts; and the sand filtering device comprises a sand filtering box, a second sand collecting barrel is arranged in an inner cavity of the sand filtering box, a conical sand filtering net is arranged above the second sand collecting barrel, a sand collecting pipe is arranged at the topof the sand filtering box, a mixture of sand and water in the sand collecting pipe is sprayed to the sand filtering net through a spray head under the action of high-pressure water flow, and impurities in the sand are filtered away in the rotating process of the sand filtering net. The casting raw sand screening device has the advantages of high screening efficiency, good screening effect and thelike.

Description

technical field [0001] The invention belongs to the technical field of sand screening, and relates to a sand screening device, in particular to a casting raw sand screening device. Background technique [0002] Raw sand is the most basic material for molding (core) in foundry production, and the most widely used is quartz sand, commonly known as silica sand. In sand casting, raw sand is the aggregate and main component in the mixture, and the casting sand used for the first time is called raw sand. In casting, there are certain performance index requirements for raw sand, such as: (1), air permeability, in order to allow gas and liquid pyrolysis residues to escape from the casting cavity during pouring, dry sand must have sufficient air permeability sex. Excessive mud content and excessive dust content in the raw sand will reduce the air permeability of the sand. (2) Moisture content. Moisture in the sand is the root cause of many casting defects. It is necessary to elimi...

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Problems solved by technology

(3) Purity, the original sand contains other large particles of impurities, such as fine gravel mixed in the original sand, which will affect the strength of the mold and the surface quality of the casting

[0003] The traditional screening method is usually to manually screen the raw sand with a sieve, which is inefficient. In order to solve this problem, there is a machine device for screening. At present, the usual machine screening is through the set screen, using the vibration of the screen. , to screen the sand falling on the sieve. The main problems are: 1. If the sand has agglomerates, it cannot pass through the sieve if the agglomerates are not broken; 2. If the sand is relatively wet or has large particles of impurities, the sand is easy to stick Attached to the sieve hole, or the impurities are blocked on the sieve hole, causing the sieve hole to be blocked and the screening efficiency to drop; 3. The screening cannot be carried out continuously, and the impurities screened out on the sieve need to be turned over or poured out of the sieve. The impurities on the net are poured out, and then the sieve returns to its position to continue screening. During the process of the sieve being overturned, the sand cannot be screened, so that the screening cannot be carried out continuously and the screening efficiency is reduced.

Chinese patent (application number: CN201720813864.4) discloses a sand screening mechanism, which uses the vibration of the screen in the mechanism to screen the sand falling on the screen. Although the screening mechanism replaces manual screening and improves efficiency, there are also The above-mentioned sieve holes are easy to be blocked, and the screening cannot be carried out continuously.

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