CHAIN BLAST CLEANING MACHINE

The field of application for DISA Blast Cleaning Machines is exceptionally widespread; in particular in the descaling sector there are a variety of possible applications for this equipment. Especially visionary projects solving the customer tasks in a convincing way are in great demand. For a Chinese customer, ZhangJiakou Coal Mining Machinery Company based in the province of Hebei in China, DISA Hagen developed a successful concept which convinced by simple handling and supplying perfect blasting results.

A DISA Blast Cleaning Machine with 4 blast wheels (Ø 380mm, 15 kW power) was planned for the mechanical descaling of round-link chains with a wire diameter of 20 – 52 mm and bars ranging between 86 and 165 mm. The compact design requires a floor space of only 3 x 3 m for the blast cleaning machine and chain transport facility. The sound insulation panelling ensures that the noise level is kept below 80 dB(A).

Chains blast cleaned perfectly: The functional principle

The chains are extracted from a transport container, loose chain strands are linked by the operator using special chain links to enable continuous operation. A drive wheel at the machine exit ensures a smooth chain transport.  It is configured in such a way that it can be used for all chain dimensions.  A brake positioned on the entrance side prevents any unintentional slipping of the chain. Via deflection rollers the chains are transported from the top to the shot blast chamber and run through this section in a U-shaped loop. The arrangement of blast wheels ensures that the chain links are evenly blast cleaned on the descending and ascending strand. The vertical chain guide ensures that the chain does not have to be additionally tightened during processing. Moreover, the abrasive – also deposited between individual chain links – is inevitably removed in the process.

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The throughfeed speed – depending on the scaling degree – ranges between 3 – 4 m/min with a surface quality of SA 2.5.  The customer’s expectations are thus surpassed not only in terms of quality, but also with regard to quantity. After the blas cleaning, the chains are deposited in a second transport container and following painted. The flexible machine concept also enables smaller chains with a wire diameter ranging between 8 and 20 mm to be treated. For this purpose 2 additional deflection rollers are installed. The chains run through the machine in 4 strands, thus allowing the blast cleaning performance to be optimally utilised.

R. Braetschneider