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introduction：The design of injection mold must follow the following steps： （1） Plastic analysis 1． Clear design requirements of plastic parts Read the plastic parts drawing carefully，Plastic varieties from products，Shape of plastic parts，Dimensional accuracy，Surface roughness and other aspects of the injection molding process to consider the feasibility and economy，In necessity，The possibility of material type and structural modification of plastic parts should be discussed with product designers。 2． Determine the production volume of plastic parts In small batch production，To reduce costs，Mold as simple as possible；In mass production，The quality of plastic parts should be guaranteed under the precondition，Try to use a mode of multiple cavities or high speed
2015-03-27 Reading quantity 2803
introduction：junhechuan River dredger Engineering ships dredging channels and harbors in ancient China。With the increasing size and number of ships,Dredging of waterways and ports is becoming increasingly important,There are records of river dredging ships and their development in history。《History of the Song Dynasty》record，At that time, the dredging rake dredged the river，Thats eight feet long、A wooden rake with two feet of teeth brought stones to the bottom of the river，Two boats moored eighty paces apart were tackled with a raking,To and fro to scratch the sand,Then move the boat to dredge section by section。To the Qing Dynasty Chen Zhicen built the engine ship,Also with two boats,A boatload of plows，A boat is loaded with wheels，Alternating dredging。Dredge rivers and rake profits
2015-03-27 Reading quantity 2777
introduction： Influence 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。]There can be many factors in service life，Use factors and intrinsic factors can be further explained。 The use factor mainly refers to the installation adjustment、Service and maintenance、Whether the maintenance and repair meet the technical requirements。Install according to rolling bearings、Use、maintenance
2015-03-27 Reading quantity 1535
introduction：The molten steel from the furnace is cast into billets，The ingot or billet is pressed into steel（Iron and steel products）。Many kinds of steel，Generally can be divided into types、plate、Four categories of tubes and wires。 1、Section steels There are many types of steel，It is a kind of solid long steel with a certain cross-section shape and size。According to its different section shape and divided into simple and complex section two。The former includes round steel、Square steel、Flat steel、Hexagon and Angle steel；The latter includes steel rails、joist、Steel channel、Window frame steel and shaped steel, etc。Have a diameter of6.5-9.0mmSmall round steel called wire。 2、Steel plates
2015-03-27 Reading quantity 1427
introduction：Used for planing、A tool having a cutting part（See picture[Plane tool structure diagram]）。Planer knife can be divided into longitudinal cutting according to the use、transversal、fluting、Cutting and forming planer knives, etc。The structure of the planer is basically similar to that of the turning tool，But the planer knife is working intermittently，Impact load。therefore，Under the same cutting section,The section size of the tool bar is larger than that of the turning tool1.25～1.5times，And adopt large negative edge Angle(-10°～-20°)，To improve the performance of cutting edge against impact load。In order to avoid bending deformation of the planer bar under the action of cutting force，This allows the blade to nibble into the workpiece，Usually a bend is used
2015-03-27 Reading quantity 2777
introduction：Dynamic weighing instrument mounted on belt conveyor。Belt scales can be used against belt conveyors(See belt conveyor)Automatic continuous measurement of transported bulk solid materials，The instantaneous throughput and total cumulative throughput through the weighing frame can be measured。Belt scale is widely used in industry for automatic continuous weighing of feed and automatic weighing of ingredients。Belt scale is divided into mechanical and electronic two types，Electronic belt scales are widely used in industry。It consists mainly of a weighing frame、idler、Conveyor belt、Force transducer、The speed sensor and the measurement circuit are composed（See picture[Principle and block diagram of belt scale]）。The instantaneous conveyance of the belt conveyor is equal to the mass of the material per unit length of the belt
2015-03-27 Reading quantity 2769
introduction：After decomposing the engine，Check the skew of the crankshaft。UseVRing supports the crankshaft，Use a dial gauge to read the degree of yaw，The degree of deflection of the crankshaft shall not exceed the limit of use，Limit of use0.05mm。 Excessive crankshaft yaw is often the cause of abnormal engine vibration，This vibration will shorten the life of the engine。therefore，If the limit of use is exceeded, it should be sent to the repair department for repair or replacement。 Check 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 are produced on the shaft
2015-03-27 Reading quantity 1437
introduction：1、Abide by《General operating rules for casting equipment》Relevant provisions。 2、pre-work，Check the boom for looseness，Whether the screen is damaged，If loose or damaged，Maintenance personnel should be notified to repair。 3、Start with a running test，Then run empty2-3minutes，Check the Fourier system（Motors and retarders）Sum elevator、Whether the motion of the screen frame is smooth，Just make sure everythings okay，Before production can proceed。 4、While driving，Start the elevator first，After opening the sand machine、Parking time，Stop the sanding machine first，Rear stop hoist。 5、According to different models of modules，Control the sand volume。 6、When adding sand to the elevator，Dont
2015-03-27 Reading quantity 2789
introduction：To save energy，Reduce cost，Automobile lightweight has become the development trend of the automobile industry，And the fuel tank is also a very heavy product in the car，Like Santana2000The fuel tank weighs up to6KgIf metal is used6kilogramme。The use of plastic fuel tanks by car manufacturers is increasing。Currently in the United States95%The car has a plastic fuel tank，There are also in Europe91%Car models use plastic fuel tanks，Even Japan, a big country with iron fuel tanks, has realized the hidden dangers of iron fuel tanks，The mass development of plastic fuel tanks has also begun。At present, most cars in China have used plastic fuel tanks，And the northeast and the river
2015-03-27 Reading quantity 2892
introduction：danxiang jigou Unidirectional mechanism unidirectional mechanism When the direction of motion of the driver changes,The follower moves continuously or intermittently,But the direction of motion remains the same for the body。The concrete forms are ratchet mechanism and escapement mechanism。It is often used to implement feed、immobilize、Movements such as indexation and indexing，Mostly for bicycles、A shaper、Cranes and clocks。figure[Bicycle freewheel]The bicycle flywheel is a one-way mechanism。It has a transcendental effect，When the small sprocket turns counterclockwise，Drive the rear axle to rotate through the pawl；Proper alignment
2015-03-27 Reading quantity 2783
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