30 The reason for the proper tension sieve net is that the looseness of the net generates secondary vibrations that are different from the original vibration of the sieve machine, resulting in fatigue destruction of the wires. Therefore, it is necessary to apply appropriate tension to the sieve net. The figure below shows the results of a wire mesh tensile test and is generally referred to as the S-S curve. Stickness is taken on the horizontal axis and tensile loads such as unit widths are taken on the vertical axis, and this is used as tension. The strain at the yield point is usually around 1%. In the Kansai wire network, 0.25 to 0.5 times the yield point is appropriate tension. Therefore, the appropriate tension indicates the strain of 0.25 to 0.5%. The higher the opening rate, the lower the clogging. ○The processing capacity is improved. ○The efficiency of sieves is high (be careful of gaps). ○The net is weak and the life is short. ○There is a gap in the eyes, and the opening of the eyes is easy to go wrong. Problems of clogging The biggest challenge in stimulating is clogging, which has various symptoms as shown below. You have to think about countermeasures according to each symptom. Symptom-cause countermeasures Increase the amplitude and frequency of the machine. Increase the opening rate by narrowing the line diameter. Manage the tension of the net to make it optimal tension. Take measures to prevent clogging, such as tapping balls and chain mounting. Consider toncap wire mesh and tie rod wire mesh. The vibration of the machine is weak. The opening rate is low. The tension of the net is weak. We do not take measures to prevent clogging. The shape of the mesh. Particles that are similar to the size of the mesh in one mesh are packed so that they can be pushed one by one. It has a network wire and 3 to 4 contact points, making it the most difficult to remove. A two-stage formula is used to remove long ones separately. It's caught in the mesh. It occurs when long things such as lint, pieces of cloth, and wire are contained. Reduce the supply. Change the vibration conditions of the machine. Take measures to prevent clogging, such as tapping balls and chain mounting. Take measures to remove power such as earth, corona discharge, and humidification. There is a large supply. We do not take measures to prevent clogging. Due to static electricity. Particles smaller than the mesh gather in a single mesh, push each other, and clogged. Generally, it is prone to the supply side. Single clogged clogged clogged clogged clogged 5 0.5% 1.0 10 15 strain (%) 20 25 tension (N/mm) opening rate 25% opening rate 40% Opening rate 60% “Sieved reading book” Shigeo Miwa 0. Take measures to remove power such as earth, corona discharge, and humidification. Increase the amplitude and frequency of the machine. Consider toncap wire mesh with rectangular mesh and tie rod wire mesh. Consider fluorinated resin coatings. It depends on water. Due to static electricity. Others It is clogged with particles attached. d A Ｇ： Estimated weight (kg/m) A: Open eye (mm) ε: Opening rate (%) G = 12.7 × d A + d G = M × d 22 2 A + d A = 2 × 100 ε d M 25.4 = A M: Mesh d: Line diameter (mm)
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