Sand mill is a kind of sand treatment equipment widely used in foundry industry. According to the characteristics of sand mixing process, sand mixer can be divided into: roller sand mixer with rolling and grinding as its main functions; Blade sand mixer with mixing effect as the main factor; Countercurrent or rotor sand mixer with grinding and mixing functions and pendulum sand mixer with rolling and mixing functions. According to the nature of work, sand mixers can also be divided into intermittent and continuous sand mixers. Appeared at the beginning of the 20th century, it is still widely used to mix molding (core) sand with clay as binder. This sand mixer is equipped with rollers with a certain weight. When mixing sand, the roller can revolve around the main shaft of the sand mixer or rotate around the roller. The roller grinds molding sand while rolling, so that the molding sand particles are covered with a layer of adhesive film. When mixing surface sand and core sand, the quality of mixed sand is better than other sand mixers. In the early 1950s, a spring roller sand mixer appeared. Due to the spring pressure, the weight of the roller is reduced, and a higher spindle speed can be used. At the same time, the rolling pressure can be automatically adjusted with the thickness of the rolled sand layer, which ensures the uniform sand mixing effect and improves the sand mixing efficiency.

Specific model

S 1 1 10 double drum sand mixer;

S 1 1 1A double drum sand mixer;

S 1 1 12 double drum sand mixer;

S 1 14C double drum sand mixer;

S 1 18 twin-roll sand mixer

Technical parameter project unit s111114cs118s12s65438. +03 15s 14 15438+0000 1250 1820 1800 1200 1500 65438。 H1.5-22-410-15-6-88-107-9 feed rate kg1065438+35030. When the chassis rotates clockwise, the rotor and scraper rotate counterclockwise, and the rotating speed of the rotor is higher than the chassis. When mixing sand, because the chassis and rotor of the sand mixer move in opposite directions and rotate at different speeds, the molding sand on the chassis will get different speed difference, and the corresponding friction force and shear force will be generated between the sand particles, resulting in friction, mixing and crushing, which not only has high mixing efficiency, but also has good quality of the mixed molding sand.

Example: Micro sand mixer for experiment

The experimental sand mixer is an important equipment for experimental research on the technological performance of molding sand casting. Experimental sand mixer, whether it is a runner or a rotor. The amount of bowl-shaped sand added is 3 kg at a time, which is mainly used for the experimental study of the normal performance of mold (core) sand at room temperature. When these sand mixers are used to study the properties of molding sand with only tens or hundreds of grams of sand each time, such as thermal expansion, they will waste high-quality raw sand and binder and increase the experimental cost. In order to solve the above problems, we developed a micro sand mixer to carry out experiments, and the amount of sand mixed at one time was only 250 g. The invention has the advantages of simple structure, convenient operation, adjustable parameters, less sand mixing at one time and the like. The experimental results show that the quality of mixed sand meets the requirements of laboratory sand mixer, and at the same time, the consumption of raw materials and the experimental cost are reduced.