Types and functions of sensors in the most popular

2022-08-03
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The types and functions of sensors in CNC machine tools

different types of CNC machine tools have different requirements for sensors. Generally speaking, large machine tools require high speed response. Medium and high-precision CNC machine tools are based on the required accuracy. The steel bar zigzag testing machine is developed according to the national standard metal zigzag testing method (gb232 (8). The annual consumption will exceed 5trillion tons

the sensors for displacement detection mainly include pulse encoder, linear grating, resolver, inductosyn, etc

1. Application of pulse encoder

pulse encoder is a kind of angular displacement (speed) sensor, which can change mechanical angle into electrical pulse. Pulse encoders can be divided into three types: photoelectric, contact and electromagnetic. Among them, photoelectric is widely used

the rest are under preparation) metrological calibration specifications for the calibration of temperature screening instruments in use in Hubei Province

2. Application of linear grating

linear grating is made by using the transmission and reflection of light. It is commonly used in displacement measurement, with high resolution and higher measurement accuracy than photoelectric encoder, which strives to make a new breakthrough in material functionalization, greening and environmental friendliness. It is suitable for dynamic measurement

in the feed drive, the grating ruler is fixed on the NC drilling machine bed, and the pulse signal generated by it directly reflects the actual position of the carriage. The servo system for detecting the position of the worktable of NC drilling machine with grating is a full closed-loop control system

3. Application of resolver

resolver is an induction micromotor whose output voltage is a continuous function of angular displacement. Rotary transformer is composed of stator and rotor. Specifically, it is composed of one iron core, two stator windings and two rotor windings. Its primary and secondary windings are placed on the stator and rotor respectively. The degree of electromagnetic coupling between the primary and secondary windings is related to the rotation angle of the rotor

4. Application of inductosyn

inductosyn is made by using the principle that the mutual inductance of two planar windings changes with different positions. Its function is to convert the angular or linear displacement into the phase or amplitude of the induced electromotive force, which can be used to measure the linear or angular displacement. Inductosyn can be divided into linear type and rotary type according to its structure. The linear inductosyn consists of a fixed length and a sliding ruler. The fixed length is installed on the machine bed, and the sliding ruler is installed on the moving parts and moves with the workbench; The stator of the rotary inductosyn is a fixed disc and the rotor is a rotating disc. The inductosyn has the advantages of high precision and resolution, strong anti-interference ability, long service life, simple maintenance, long-distance displacement measurement, good processability and low cost. At present, linear inductosyn is widely used in large displacement static and dynamic measurement, such as CMM, program-controlled CNC machine tools, high-precision heavy-duty machine tools and machining center measurement devices. Rotary inductosyn is widely used in the turntable of CNC machine tools and instruments and various rotary servo control systems

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