Pre-tensioning sieve structure have advantages as following: ①simple installation and maintenance; As long as regularly checking tension condition and timely adjust tension bolt to ensure sufficient tension, the failure rate is almost zero. ② sieve is of long service life. It gives full play of advantages of high-strength good wear resistance that polyurethane material has. The sieve material at feeding point can use be used for one and a half month, the middle two can be for 3-5 months, the bottom one can for about six months. Its weighted average life is (1.5 × 1 +4 x2 +6 xl) / 4 = 3.875 months. ③ The pre-tensioning strengthens the elasticity, which generates an additional movement and effectively avoids sieve mesh being plugged by materials. ④ Compared with other sieves, it is of lower running noise and decreased dust production.

The feeding point is a weak link of the sieve, the impact of ore often causes a range of local losses, and thus leads to damage of the entire sieve--it should be solved.

Installation structure: summing up the first two tests, and absorb the advantages of other sieve plate mounting structure, making use of the polyurethane material elastic properties, we modified the test program once again as following:

Both ends of the hook plate are made of 3 mm thick steel plate which is linked by six wire rope, part of hook board are cast for one with wire and polyurethane sieve. Wire rope not only hook prevents hook board dropping off, also improves the strength of the sieve. The ends are connected by articulated coupling, adjust tighten bolts at both ends so that the sieve in a tension state in advance, the middle is fixed by the plate and bolt, the following is supported by two channel, so that maintain a certain gap between the sieve and the sieve framework, and get as much vibration screening area as possible.

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