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introduction：Fit tolerance（fittolerance）Refers to the holes that form a fit、Shaft tolerance sum。It is the amount of variation allowed in the gap or interference。The size and position of the tolerance zone of the hole and shaft constitute the fit tolerance。The size of the mating tolerance of the coupling hole and shaft indicates the mating accuracy of the hole and shaft。The size and position of the hole and shaft fitting tolerance zone indicate the fitting precision and fitting nature of the hole and shaft。 &...
2016-01-27 Reading quantity 1568
introduction：
one、plcHistory of development
Programmable logic controller，Also known as programmable controller，There have been many definitions。It can be regarded as a specially designed industrial computer，The whole design principle is simple and practical。
2016-01-27
Reading quantity 1948
introduction：1Characteristic parameters of high power relay 1.Rated operating voltage or rated operating current：This refers to the voltage or current required by the coil when the high-power relay is working。The construction of a type of high-power relay is generally the same。To adapt to different voltage circuit applications，A model of high power...
2016-01-27 Reading quantity 1536
introduction： one、plcdefinition Programmable controller（programmble controller）For shortpcorplc。It is developed on the basis of electrical control technology and computer technology，And gradually developed into a microprocessor as the core，Automation technology、Computer technology、A new industry integrated with communication technology...
2016-01-27 Reading quantity 1624
introduction： Structure and principle of intermediate relay The structure and principle of the intermediate relay are basically the same as that of the AC contactor，The main difference with the contactor is：The main contact of the contactor can pass a large current，The contact of the intermediate relay can only pass a small current。therefore，It can only be used in control circuits。 It usually has no main contact，...
2016-01-27 Reading quantity 1632
introduction： catalogue 1Principle of digital pressure sensor2Digital pressure sensor features3Applications of digital pressure sensors4Precautions for the use of digital pressure sensors &nbs...
2016-01-27 Reading quantity 1673
introduction： Sensor classification： How they transform(The basic physical or chemical effects of sensor operation)；Their use；Their output signal type and the materials and processes used to make them。 &n...
2016-01-27 Reading quantity 1540
introduction： Main classification 1.Classified according to the working principle or structural characteristics of relays 1)Electromagnetic relay：The force generated between the electromagnet core and the armature is used by the circuit in the input circuit...
2016-01-27 Reading quantity 1527
introduction： A capacitive sensor is a device that converts a measured change into a capacitance change，It is itself a variable capacitor。Resistance sensor is a kind of sensor with resistance strain gauge as the conversion element。Capacitive sensors have many advantages over resistive sensors，Like capacitive sensors have good stability、High measurement accuracy、Simple structure、Easy to use，These advantages are much better than resistive sensors，The following Xiaobian will introduce it in detail...
2016-01-27 Reading quantity 1521
introduction：Central issue： Typical circuit of power off delay relay Power off delay relay control line analysis Power off delay relay use precautions solution： Adopt bistable polarization electromagnetic relay Select an electromagnetic relay with a higher operating voltage of the coil adopt1Winding latching type relay A time relay is a controller whose delay function is realized by an electronic circuit。Under control...
2016-01-27 Reading quantity 1582
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