Characteristics of Polyurethane Screen
Writer： admin Time：2020-08-10 16:31 Browse：℃
Polyurethane screens have been used in cars, trains, papermaking machinery, construction machinery, etc. in the past. They have not been used for a long time in vibrating screening machinery, but because of their many advantages, they are gradually being used by vibrating machinery. Used by production enterprises and achieved good results. Polyurethane screen uses compressed air (water) as a medium, and is an elastic element that uses the reaction force of its internal compressed air as an elastic healing force.
is a non-metallic spring with a spring effect. Polyurethane cold storage board is fireproof, flame retardant, and high temperature resistant. After the addition of flame retardants, polyurethane is a kind of flame-retardant self-extinguishing material. Its softening point can reach more than 250 degrees Celsius. It will only show differentiation at higher temperatures: in addition, polyurethane will be in its The outer surface of the foam constitutes ash, which helps to block the foam below. Can effectively avoid fire extension. In addition, polyurethane does not generate harmful gases at high temperatures.
Polyurethane material has a stable porosity structure and is basically a closed-cell structure. It not only has a thermal insulation function, but also has good freeze-thaw resistance and sound absorption. The average life span of rigid foam polyurethane insulation structure can reach more than many years under normal use and repair conditions. It can be achieved under normal operating conditions during the life of the structure, in dry, humid or electrochemical corrosion, and because the unit price of insects, fungi or algae foaming materials is higher than that of other traditional insulation materials.
However, the additional costs will be offset by a significant reduction in heating and cooling costs. Polyurethane screen has good wear resistance and long service life. Its wear resistance is 3 to 5 times that of steel screens and more than 5 times that of general rubber screens. Because of the characteristics of the secondary oscillation of polyurethane, the polyurethane screen has a self-finishing effect, so the screening efficiency is high. The repair workload of the polyurethane sieve is small, the polyurethane sieve is not easy to be damaged, and the service life is long, so it can greatly reduce the amount of repairs and the loss of maintenance.
Method of inspecting perforated mesh screen
Touch inspection: Wipe the surface of the sieve plate clean with clean gauze. Workers need to wear touch gloves to touch the surface of the sieve along the longitudinal direction of the sieve. This inspection method depends on the experience of the worker. If necessary, oilstone can be used to polish the detected suspicious area and verify it, but this method can be regarded as an effective and rapid inspection method.
Whetstone polishing: first wipe the surface of the sieve plate with clean gauze, and then use oilstone for polishing. Use relatively small oilstone for arcuate and hard-to-touch areas. The choice of oilstone particle size depends on the surface conditions (such as Roughness, galvanizing, etc.). It is recommended to use fine-grained oilstone. The direction of whetstone grinding is basically along the longitudinal direction, and it fits well on the surface of the sieve plate. Some special areas can also compensate for the lateral grinding.
Gauze polishing: Use clean gauze to clean the surface of the outer screen. Use a flexible sand net to close the surface of the sieve plate and grind it longitudinally to the entire surface. Any pitting or indentation will be easily found.
Oiling: Wipe clean the surface with clean gauze. Then use a clean brush to apply oil evenly to the entire surface of the screen in the same direction. The oiled sieve is inspected under strong light, and it is recommended that the stamped parts be erected on the body. This method can easily find the fine pits, pits, and ripples on the stamping parts.
