The sandblasting process is an indispensable step in many activities related to the mechanical industry. In the final phase of preparation of a metal object it is necessary to remove impurities or to give particular characteristics to the surface of the treated object to make it suitable for painting or for various surface treatments. These operations disperse large quantities of sand in the working environment and leave residues in the interstices of the processed products.
DU-PUY, which has always been attentive to the needs of the sector, has developed a range of powerful industrial vacuum cleaners, equipped with side channel turbine or high-performance lobe pumps, specialized in the removal and recovery of abrasives from work cabins and cracks of products subject to sandblasting.
In detail, sandblasting is a process that allows you to smooth, polish and clean the surface of a material by eroding the surface layer. This mechanical process is carried out by abrasion caused by a jet of air and sand which must then be removed by suction and in some cases could be reused in the next process.
It’s a pretty quick process considering the standards of mechanics, but it can be slow in the presence of more resistant materials to remove. In these cases you can intervene by decreasing the size of the nozzle to focus more on the jet or choose a different size or type of abrasive.
Sandblasting can be divided into two methods:
· Conventional or free-jet sandblasting, consisting of a tank in which the abrasive is put into pressure and then be launched thanks to the jet of compressed air. There are no measures to reduce the dangers generated by the production of dust or for the recovery of the abrasive material.
· Sandblasting with closed cycle, or rather with equipment for the transport and recovery of sand, which can take place in:
o Cabin with manual control, with the operator placed outside to direct the jet through guns, without release of dust in the working environment.
o Tunnel shot blasting machine, able to adapt to objects with different shapes and suitable for the treatment of medium and large pieces.
In closed-loop sandblasting, the workpieces are inserted manually inside the machine by the operator, if they are small pieces, or with the help of the crane for large pieces. To avoid the dispersion of dust in the environment the machine cannot operate if the tailgate is not completely closed.
The range of medium-power vacuum cleaners is flanked by a machine of extremely small dimensions such as the W3 HV, with 3 powerful single-phase 3-stage motors capable of developing 3.9 kW of power and 3.600mm/H2O of maximum depression. The suitable solution for the sporadic suction of small amounts of residues and dust in conventional sandblasting with low budget.
Our range of vacuum cleaners dedicated to this sector is particularly powerful and complete, suitable for standard situations for small and large companies.
In the case of large plants, where there is a need for automatic suction and discharge of large volumes of grit, DU-PUY intervenes with centralized suction systems to SILOS connected to high vacuum suction units cut to the needs of the customer.
CVAC vacuum units and the filtering Silos SILOFILTER allow the extraction of sand at a distance, in raised areas and in depth, or in large quantities thanks to the high suction power and the high capacity of containment and filtration.