Compared with the traditional coupling, the spherical roller coupling has very obvious characteristics, mainly in the following aspects:
1, the transmission of large torque, long service life; spherical roller coupling tooth surface is circular arc tooth surface, with high contact strength and bending strength;
2, smooth and efficient, low noise; between the coupling, the ball and the ball between the pair of small friction, the contact gap is small, so high efficiency, low noise;
3, strong ability to align: The relative position accuracy of the coupling to the two shafts is to be low ball, which can replace the tooth coupling to achieve an ideal centering range.
4, easy to maintain. After the use period reaches 2-3 months, remove the end cap and inject the viscous grease. The maintenance cost is low and the operation is simple.
Unsaturated polyester resin is a polymer obtained by the polycondensation reaction between polyacids and polyalcohols. The development of water is the by-product of this polycondensation process. Specifically, the Unsaturated polyester resin, also known by the English acronym UPR, is an easily printable liquid polymer which, once cured (cross-linked with styrene, by the use of particular substances, organic peroxides, named hardeners), keeps the solid shape taken in the mold. The items so realized have exceptional strength and durability characteristics. Unsaturated polyester resins are mostly used in combination with reinforcing materials such as glass fibres, that give life to the FRP (an acronym deriving from the English), a polyester reinforced with glass fibres, better known with the name of fiberglass.
Unsaturated polyester resin
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