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a better insulating material

a better insulating material

Jul 09, 2019

Electrical properties of natural rubber handwheels Natural rubber handwheels are non-polar materials and are a good insulating material. When the natural rubber hand wheel is vulcanized, the insulation property is lowered due to the introduction of polarity factors such as sulfur, an accelerator, and the like.

Media Resistance of Natural Rubber Handwheels Natural rubber handwheels are non-polar materials that are soluble in non-polar solvents and non-polar oils. Natural rubber handwheels are not resistant to solvents such as cyclohexane, gasoline, benzene, etc. Unvulcanized rubber can be dissolved in the above medium, and the vulcanized rubber hand wheel is swollen. The natural rubber hand wheel is insoluble in polar acetone and ethanol, and is more insoluble in water, resistant to 10% hydrofluoric acid, 20% hydrochloric acid, 30% sulfuric acid, 50% sodium hydroxide, and the like.

The natural rubber hand wheel raw rubber has a glass transition temperature of -72 ° C, a gel flow temperature of 130 ° C, a decomposition temperature of 200 ° C, and a violent decomposition temperature of 270 ° C. When the natural rubber hand wheel is vulcanized, its Tg rises and no viscous flow occurs.

The photoelectric encoder is a sensor that converts the mechanical geometric displacement on the output shaft into a pulse or digital quantity by photoelectric conversion, and is the most widely used sensor. A general photoelectric encoder is mainly composed of a grating disk and a photoelectric detecting device. In the servo system, since the photoelectric code disk is coaxial with the motor, when the motor rotates, the grating disk rotates at the same speed as the motor. A detecting device composed of an electronic component such as a light emitting diode detects and outputs a plurality of pulse signals. The current motor speed can be reflected by calculating the number of photoelectric encoder output pulses per second. In addition, in order to determine the direction of rotation, the code wheel can also provide two channels of optical code output with a phase difference of 90°, and determine the steering of the motor according to the state change of the two-channel optical code. According to the detection principle, the encoder can be divided into optical, magnetic, inductive and capacitive. According to its scale method and signal output form, it can be divided into three types: incremental, absolute and hybrid.