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introduction：one、Definition of plastic Plastic is mainly composed of resin，Molded into a certain shape under a certain temperature and pressure，And at room temperature can maintain a given shape of the polymer organic material。 Resin refers to a range of conversion or melting that usually occurs when heated，It has fluidity when it is transformed by external force，Organic polymers that are solid or semi-solid or liquid at room temperature，It is the most basic plastic，And the most important ingredient。Broadly speaking，Any polymer used in the plastics industry as a basic material for plastics can be called a resin。 two、Classification of plastics There is no exact classification of plastics，The general classification is as follows： 1．Plastic press material
2015-02-06 Reading quantity 2893
introduction：Rolling bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Precision score of（main）Dimensional accuracy and rotation accuracy。Accuracy levels are standardized，Fall into0level、6Xlevel、6level、5level、4level、2Grade six。 Accuracy from0Step by step increase，For general purpose0Level sufficient，But in the table used1When the condition or occasion is shown
2015-02-06 Reading quantity 1452
introduction： polypropylene（PP）Because of its small density、Good mechanical properties、Chemical resistance、tractability、High heat deformation temperature、Low price and other outstanding advantages，It has been widely used in many industries。Flame retardantPPHas become the use of flame retardant dose maximum、The fastest growing polymer flame retardant material。Magnesium hydroxide［Mg(OH)2］As a halogen-free flame retardant，In addition to flame retardant and smoke resistance，And the dehydration temperature is high，More suitable for higher processing temperaturePPFlame retardant modification of isohigh polymer，It can better meet the requirements of relevant regulations in terms of reducing environmental hazards and safe material handling，It also makes flame retardant plastics easier to re-use
2015-02-06 Reading quantity 2896
introduction：First step:Crystal expansion The use of expansion machine will be provided by the manufacturer of the whole sheetLEDThe wafer film expands uniformly,So attached to the surface of the film tightly arrangedLED(Light-emitting diode)Grain opening,crystalloid. The second step Rubber backing Place the expanding ring of the expanded crystal on the surface of the gluing machine that has scraped the silver paste layer,Silver on ones back[Shanghai Yin:Shanghai Silver official website，Silver mounting rail]pulp.Silver point paste.Suitable for bulkLEDchip.Use the dispenser to dot the appropriate amount of silver paste onPCＢOn the printed circuit board. The third step Put the expanding ring of the prepared silver paste into the crystal holder,By the operator under the microscope willLEDThe chip is pierced with a needle pen
2015-02-06 Reading quantity 2794
introduction：gongreshi qilunji Heat-supply turbine steam turbine for cogeneration A steam turbine that provides both power and heat。The power it provides can be used to drive a generator running at a constant speed or a pump running at a variable speed、Blower and other machinery；The heat energy provided can be used for industrial production or civil use。The heat energy of steam can be fully utilized by the application of heat-supply turbine。The heating turbine may be of back pressure type、Extraction condensing type、Extraction back pressure type and low vacuum condensing type。Exhaust steam is used for heating of back pressure turbine。Steam extraction
2015-02-06 Reading quantity 2790
introduction：The three key functions of the automobile clutch 1、Ensure a smooth start：The car is at rest before starting，Once in gear，The car will suddenly take on power and thrust forward，It will not only cause damage to the tension controller of the machine，And the driving force is not enough to overcome the huge inertial force generated by the cars forward thrust，Cause the engine speed to drop sharply and stall。The clutch is used to temporarily separate the engine from the gearbox at the start，Then the clutch gradually engages，There is a phenomenon of slippage between the active part and the driven part of the clutch，The torque from the clutch can be gradually increased from zero，While cars
2015-02-06 Reading quantity 2880
introduction：Use clean diesel，It is particularly important for the construction machinery powered by diesel engine。If the diesel in the tank is not clean，It will significantly aggravate the fuel string plunger、Wear or corrosion of precision pairs such as oil delivery valves and injection nozzle needle valves，Thus greatly reducing the reliability and durability of the machine operation。For this purpose，Pay attention to the daily maintenance of the fuel tank。 （1）Before diesel fuel is added to the tank，correspondence48hPrecipitation above，To prevent impurities in the oil from being carried into the tank。 （2）Construction machinery is often scattered in the field，It is not convenient to drive back to the tank depot for refueling，The oil is delivered to the construction site in barrels。The pumping unit that fuels the machine at this time
2015-02-06 Reading quantity 1445
introduction： Rolling bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The complete code of parts and accessories consists of basic code and supplementary code。 The basic designation is given by the bearing type，Size series code and inside diameter code constitute。Indicates the basic type of bearing，Structure and size，Is the basis of bearing code。
2015-02-06 Reading quantity 1555
introduction：bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The configuration includes not only rolling bearings，It also includes components related to bearings，Such as shaft and bearing seat。Lubricants are also a very important part of the bearing configuration，Because lubricants are abrasion and corrosion resistant，In this way the bearing can play its full role。In addition
2015-02-06 Reading quantity 1464
introduction： （1）Glass transition temperatureTg：Amorphous polymer（Includes an amorphous part of a crystalline polymer）The transition temperature from glassy state to high elastic state or from the latter to the former。It is the lowest temperature at which the chain segments of amorphous polymers move freely，It is also the upper limit of the working temperature of the product。 （2）Melting temperatureTm：For crystalline polymers，Refers to the temperature at which the three-dimensional long-range ordered state of the macromolecular chain structure transforms into a disordered viscous state，Also known as the melting point。It is the lower limit of the molding temperature of crystalline polymer。 (3)Flow temperatureTf：Amorphous finger
2015-02-06 Reading quantity 2789
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