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introduction：Programmable controller（Programmble Controller）For shortPCorPLCIt is an electronic system for numerical operation，Specifically designed for use in industrial environments。It uses a memory that can be programmed，Used to store logical operations and sequence control during execution、timing、Instructions for counting and arithmetic operations，And through digital or analog input(I)Sum output(O)port，Control various types of machinery or production processes。Programmable controller 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、New industrial control device integrated with communication technology。At present，PLCIt has been widely used in the automatic control of various production machinery and production process，Become one of the most important、The most popular、The most widely used industrial control devices，It is recognized as the three pillars of modern industrial automation（PLC
2017-07-17 Reading quantity 279
introduction：Classification and use of current relays Slave structure type，Current relay<span style=fo...
2016-03-14 Reading quantity 1685
introduction：LL—12/5Calculation of protection setting value of overcurrent relay。 （1）Current velocity break protection（Should avoid the starting current of the motor or the output current of the motor when the external short circuit） Idzj=Kk x kjx ×【（Kq×Ied）÷N1】 Kk：Reliability factor1.8—2.0 KJN：Coefficient of connection1.0 Kq：Multiple of motor starting current。：icdRated current of motor（A） N1:Current transformer ratio。 (2) Overload protection（The rated current of the motor should be avoided） Idz.j=Kk×Kjx×【Ied÷（Kh×N1）】 Kk：Reliability factor，Action is taken at trip1.2。： KhRelay return coefficient take0.85。 kxj、ied、n1:Take the same value（１） The action time limit of the protective device is in practical application，The action time limit can be pressed to double the action current，Only overload time is allowed，Characteristic curve in relay Online search10The operating time when the operating current is doubledTjnCan be calculated according to the following formula： tgK=150÷｛【（2×Idz.j×N1）÷（Kjx×Ied）】2 －1｝ Calculation ex
2017-02-08 Reading quantity 331
introduction：Pneumatic actuator that converts the pressure energy of compressed gas into mechanical energy。There are two types of cylinders for reciprocating linear motion and reciprocating swing(See picture Type of cylinder )。The reciprocating linear movement of the cylinder can be divided into single action﹑Double acting﹑Diaphragm type and impact cylinder 4Kind of。(1)Single acting cylinder﹕Only one end has a piston rod﹐Air is supplied from the piston side﹑Output force in one direction﹐Return by spring or self weight。(2)Double acting cylinder﹕Alternate air supply from both sides of the piston﹐Output force in one or both directions。
2015-01-11 Reading quantity 2944
introduction：one、Characteristics of cylinder head mold for motorcycle engine Cylinder head is a very important key part of motorcycle engine，Its role is to form the working volume of the cylinder and guide the piston movement，At a high temperature、High tension、Poor lubrication、Work under alternating loads and corrosion conditions。To increase the cooling area，Ensure adequate heat dissipation，A number of heat sinks are cast on its outer surface，And has a large number of supporting ribs。lamina、The sinews and so on form small deep and complex grooves in the mold，Can not be cut with a tool machining，Electrodes must be made to shape by electrospark machining。therefore，Edm plays an important role in the manufacture of cylinder head die。 The cooling blade is characterized by a circle around the cylinder head、large(5～14Slice inequality)、Small thickness(3mmaround)、Small chip spacing(10～12mm)。The mold structure adopts three-way core pulling(See picture3)。Each mold core has a large number of deep slots(See picture4)。The main part of
2015-01-04 Reading quantity 2948
introduction：keyword：Aluminum alloy cylinder head、Gravity casting、Tilting top pouring process、Sequential solidification Dingbang mold factory was founded in the last century90Early era，Specializing in automotive engine aluminum alloy cylinder head metal gravity casting mold design and manufacturing，It has been produced so far20Multiple models，60Multiple cylinder head molds。21The beginning of the century，In order to adapt to the surge of Chinas automobile industry development，Employ the domestic metal gravity casting process、die10A number of experts set up Dingbang automotive cylinder head mold research Institute，Dedicated to the car cylinder head（Aluminium alloy）The casting process and mold development and research。 The cylinder head is a very important part in the automobile engine，The upper part is equipped with a camshaft，Lower and cylinder block、The piston forms the combustion chamber，On both sides are the intake and exhaust ducts，It is connected with the intake manifold for oil and gas entry and the exhaust pipe fo
2015-01-01 Reading quantity 2984
introduction：one、Characteristics of cylinder head mold for motorcycle engine Cylinder head is a very important key part of motorcycle engine，Its role is to form the working volume of the cylinder and guide the piston movement，At a high temperature、High tension、Poor lubrication、Work under alternating loads and corrosion conditions。To increase the cooling area，Ensure adequate heat dissipation，A number of heat sinks are cast on its outer surface，And has a large number of supporting ribs。lamina、The sinews and so on form small deep and complex grooves in the mold，Can not be cut with a tool machining，Electrodes must be made to shape by electrospark machining。therefore，Edm plays an important role in the manufacture of cylinder head die。 The cooling blade is characterized by a circle around the cylinder head、large(5～14Slice inequality)、Small thickness(3mmaround)、Small chip spacing(10～12mm)。The mold structure adopts three-way core pulling。Each mold core has a large number of deep slots。The main part of the three-way core pulling i
2014-12-20 Reading quantity 2959
introduction：Direct acting solenoid valve principle：When powered on，The electromagnetic coil generates an electromagnetic force to lift the closure from the seat，Valve open；In power off，Disappearance of electromagnetic force，The spring presses the closure against the valve seat，Valve closing。 peculiarity：In vacuum、Negative pressure、It works at zero pressure，But the diameter generally does not exceed25mm。
2014-12-31 Reading quantity 3001
introduction：A valve that opens and closes with a moving iron core driven by the electromagnetic force generated by the power supply coil。pre-power﹐Valve is normally closed(Or normally open)status﹐The moving core is driven by electromagnetic force after electricity is applied﹐Make the valve open immediately(Or Off)。The solenoid valve is characterized by rapid action﹑Simple structure﹑Easy to operate。It is mainly used for automatic truncation﹑Switch on or switch fluid flow。Because the electromagnetic force and the movement of the moving core are small﹐The nominal diameter of this valve generally does not exceed80millimeter。Solenoid valves have a variety of structures﹐It is generally divided into two categories: filler free type and filler type(See picture Solenoid valve diagram )。Packless solenoid valves are not sealed with packing﹐The casing is filled with fluid
2015-01-07 Reading quantity 2909
introduction：one：applicability The fluid in the line must be consistent with the designated medium in the selected solenoid valve series model。 The temperature of the fluid must be less than the calibrated temperature of the solenoid valve。 Solenoid valve allows liquid viscosity in general20CSTbelow，Greater than20CSTShall indicate。 Working pressure differential，The maximum pressure difference of the pipeline is less than0.04MPaWhen should choose such asZS,2W,ZQDF,ZCMSeries of equal direct action and step by step direct action；Minimum working pressure difference greater than0.04MPaThe pilot type can be selected（Differential pressure type）Solenoid valve；The maximum working pressure difference should be less than the maximum calibrated pressure of the solenoid valve；General solenoid valves are one-way work，So pay attention to whether there is a reverse pressure difference，Install check valves if available。
2015-01-10 Reading quantity 3042
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