Which aspects should be considered when choosing a sand mixer?
Sand mixer is the key process equipment, and it is also the equipment that is frequently operated by workers and directly affects production and quality. Generally, continuous self-setting sand mixers are similar in structure, but the relevant links must be adjusted according to the requirements of the sand mixing process and the type of binder used to meet the process requirements. Therefore, more attention should be paid to the choice of sand mixer.
1 Process adaptability is the primary issue when choosing a sand mixer.
Process adaptability includes binder type and adding method, sand type and adding method (whether the ratio of new to old sand is changed, whether the productivity is adjusted), and the effect of sand mixing. In terms of the type of sand and the method of adding it, there is a sand mixer that mixes quartz sand and chromite sand (for example, the production of some steel castings), and the ratio of new and old sand in the sand filling process For automatic adjustment, some powder materials (to prevent dust and sand or improve collapsibility) are added before adding the binder. These all put forward higher requirements on the control, structure, and boom conveying form of the sand mixer. Some sand mixers cannot meet the requirements due to their structure and control, resulting in mixed sand species and inaccurate quantification, resulting in waste products and affecting production.
Production practice shows that the type of binder and the way of adding it are the key to reflect the adaptability of the sand mixer. Therefore, the equipment manufacturer must check the chemical composition and performance characteristics (viscosity, density, temperature sensitivity, corrosion Performance, adding method, adding amount requirements), etc. have a detailed understanding. For example, the fat-hardened sodium silicate sand process has two types of grease and one type of grease. The two types of grease are added separately or in proportion. The Pep-set process is also similar, but the liquid material system is more demanding due to the amount of addition; some binders such as alkali phenolic resin have different binder components due to different manufacturers, and the material requirements of the liquid material system are the difference. Some adhesives are highly sensitive to viscosity and temperature, requiring constant temperature control and so on. These factors must be considered when selecting a sand mixer.
2 Working reliability is the main criterion to measure the quality of sand mixer.
The continuous sand mixer directly performs sand filling operations. Whether the reliability is high or not directly affects the production efficiency and production costs, so higher requirements are put forward on the processing quality, configuration level, and electrical control. What is the reliability of the basic components, whether it can achieve good human-machine dialogue, whether it can meet the requirements of workers'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' quality, and whether the operation and maintenance are simple should be considered. At the same time, because workers have more contact with them, safety interlock control is particularly important, otherwise it is easy to cause safety accidents.
3 A good sand mixer should be able to adapt to different qualities of reclaimed sand, and ensure the quality of sand mixing while reducing binder consumption.
As we all know, the amount of binder added is a key factor affecting the cost of the self-setting sand process. In addition to the quality of reclaimed sand, the design level of the sand mixer also has a greater impact on the added amount. We know that the release rate of self-hardening sand is only about 40% during the regeneration process. In the subsequent transportation and movement process, the film will be peeled off, and some regeneration equipment itself is not completely winnowed, which causes the accumulation of fine powder content. The increase in the content of micropowder and the increase in surface area will undoubtedly cause an increase in the amount of binder added when the same strength requirements are obtained. The air permeability of the sand mold will decrease and the production cost will also increase. This is why some manufacturers have a high binder content An important reason for constant and more waste. In fact, the increase in the amount of resin added will not only increase the cost, but also cause a vicious circle: large amount of resin → difficult regeneration → large amount of gas → increase in the amount of new sand → increase in the amount of resin. Therefore, the amount of binder added actually reflects the level of equipment and management of a workshop, and should be paid enough attention.
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