Brief introduction of the encoder level of protection！

Brief introduction of the encoder level of protection

        

In life, we use a lot in the field encoder used properly, can be used for a period of time when it inexplicably damaged. This is what causes it? In fact, this is because the encoder level of protection is not enough. Some users think that the work environment free of dust, moisture problems, how will damage it? In fact, the encoder in the work environment, changes to work with the encoder or downtime, since the thermal expansion and contraction caused by temperature difference between inside and outside air pressure difference, the difference between the degree of protection encoder (including other sensors), will have a "breathing" of water vapor due to internal and external pressure vapor inhalation encoder, because the accumulation of time and damage the internal optical system or the board, and damage the encoder, this internal damage accumulation is chronic, often with today's good, but internally accumulate the risks.

This situation is particularly prominent in the project, such as high temperature, temperature area, high humidity areas, coastal areas (salty air), therefore, the project used by the encoder, be sure to use standard industrial-grade high degree of protection performance encoder.

Encoder standard industrial protection class is actually divided into two parts, the shaft portion and the casing of electrical parts, some manufacturers will encoder shaft portion separately indicated level of protection and electrical parts protection. Because the shaft is rotated, water is more difficult to do, if only rely on precision ball bearing seal, to achieve complete waterproof is unrealistic, general industrial grade at IP64 (Note: The degree of protection that is dustproof and waterproof performance to IPxx 2 digits to represent the first dust-proof, waterproof second) or more, and if you want to reach IP66 or more, you need to have a special process, some by double inside the bearing structure, by adding some rubber stopper bowl to improve degree of protection, but in the low-speed encoder easy to handle, at higher speed on the difficult, most of the shaft in the IP66 or more turn up are heavy; and housing electrical part must be above IP65. The reaction on the degree of protection of the machine design, often shaft is a double bearing structure and shell package often does not depend on the outer diameter of the fixing screws, but a squeeze + O-ring sealed package. In this case, the outer diameter of the encoder housing is to see less than three screws, if three screws because the screws into the top, which is likely to cause a slight deformation of the outer roundness and slight damage, so sealing performance is difficult to have guarantees, in addition, these screws will be loosened due to vibration and thermal expansion and contraction, impact protection. Such an encoder may also be a high degree of protection in its labeling, but that is the ideal laboratory manufacturers factory state, use of the project, the more difficult or guaranteed. For example, an excellent performance in the engineering project of some famous German brand encoders, encoder on its outer diameter of the shell, it is impossible to see depends on three screws fixed, while in some Japanese Korean series economy series, this is dependent on the three screws of the housing (such low cost, easy maintenance disassembly).

Engineering project encoder used, it should be better than the shaft portion of the protection class IP64, housing the electrical part of the superior degree of protection IP65, (and the outer diameter of the housing should not rely on the three or four screws). For projects using the encoder, which is an important factor to consider.

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