Conditions that need to be met before the sand mixer is weighed

A good sand mixer should be able to adapt to different quality of reclaimed sand, while ensuring the quality of sand mixing and reducing binder consumption.

Conditions to be met by the sand mixer before weighing:

Prepare weighing tools for weighing sand and liquid materials; Prepare containers that can hold sand and liquid materials. Organic grease and water glass need to be connected in two containers. Prepare the sand proportioning process; There are no people and things unrelated to production in the working area of the sand mixer. Turn on the air compressor and dryer; The air supply pressure has reached0.4MPAbove, whether there is a signal for gas source detection; There are sand materials meeting production needs in the sand bin; There are liquid materials meeting production needs in the liquid barrel; The sand mixing cage has been tightly closed, and there is a signal for safety inspection of the sand mixing cage. Open the dust collector and pulse blowback valve.

Start the liquid material pump and circulating liquid material system required for production. If the liquid material needs to be heated, turn on the liquid material heating system half an hour before weighing.

It is well known that the amount of binder added is a key factor affecting the cost of the self-hardening sand process. In addition to the quality of recycled sand, the design level of the sand mixer also has a great influence on the amount of binder added. We know that in the regeneration process, self-hardening sand in addition to the film rate of only40%Left and right, will be removed in the later transportation and movement. In addition, part of the regeneration equipment itself air separation is not complete, resulting in the accumulation of micro-powder content. With the increase of micropowder content and surface area, under the same strength requirements, it will undoubtedly lead to an increase in the amount of binder added, and the reduction of sand permeability will also increase the production cost, which is also an important reason for the high amount of binder added by some manufacturers and many waste products. In fact, the increase in the amount of resin added will not only increase the cost, but also cause a vicious circle. Therefore, the amount of binder added actually reflects the equipment level and management level of a workshop, which should be paid enough attention.

Before adding the binder to the sand mixer, a secondary boiling dust removal device for reclaimed sand is added, and an automatic switching device for back sand is set up, which well solves the problems of high micropowder content, large surface area, and large amount of resin added. The process guarantee of the sand mixer is improved, and the amount of binder added is effectively reduced.(10%Above), Not only reduces the production cost, but also ensures the quality of the sand mold, laying the foundation for the good circulation of the self-hardening sand workshop. With this sand mixer, the general resin content is less0.9%Can meet the pouring strength requirements, saving about cost per ton of castings.60yuan to further improve the adaptability to recycled sand.

There used to be a company's sand mixing equipment, which often suffered from defects in expansion tanks and air holes. The reason for the analysis is the high content of fine powder in the reclaimed sand. Only after the replacement of the sand mixer, similar defects have never appeared in the same reclaimed sand, indicating that the sand mixer has a greater impact on the quality of the sand mold. In the process of transformation of a vehicle factory, the original recycling equipment of a company did not move, but after replacing the sand mixer, the amount of binder added was reduced under the same strength requirements.30%It fully illustrates the importance of choosing a sand mixer.