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introduction： Standard number Standard Chinese name Standard English name JB/T7040-1993(2005reexamine) Hydraulic vane pump Test method JB/T7039-1993
2015-02-18 Reading quantity 2870
introduction：Parts in the process of processing，Due to machine tool－jig－There are geometric errors in the tool system，And the deformation occurred during processing、Thermal deformation、Effects of vibration and wear，The geometric elements of the machined parts will inevitably produce errors。These errors include dimensional deviations、Form error(Including macroscopic geometric errors、Waviness and surface roughness)And position error。 Shape tolerance Shape tolerance refers to the total amount of variation allowed in the shape of a single actual element。 Shape tolerances are expressed by shape tolerances。The shape tolerance zone includes the tolerance zone shape、direction、Position and size are the four elements。Shape tolerance items are：
2015-02-18 Reading quantity 2788
introduction：The foot plate of the reducer should be installed in the absence of vibration、Very solid horizontal foundation，In applications where tilt installation is necessary，The inclination of the shaft line of the reducer shall not be greater than 15。If necessary, other special installation forms other than foot plate horizontal installation and flange vertical installation are used，Appropriate lubrication and sealing measures must be taken to ensure adequate lubrication of the reducer to prevent oil leakage。Please contact our technical department。At impact、The use of large vibration or frequent starting，The frame is connected with the foundation except by foot bolts，We also need to use dowel pins（Provide for oneself）immobilize。 A lot of
2015-02-18 Reading quantity 2871
introduction：Furnace fixing、Chamber type industrial furnace whose bottom can be moved out of the oven（See picture[Diagram of the trolley type furnace]）。The bottom of the furnace equipped with a walking mechanism is pulled out or dragged into the furnace by a traction mechanism along a track on the ground，Easy to load and unload workpieces outside the furnace。The trolley type furnace is suitable for large ingot which cannot be heated in the chamber type furnace、billet、Heat steel plates and large castings before forging、forging、Heat treatment heating of welded parts。Car type furnaces can be fueled by gas or liquid，Electric heating is also available。When using gas or liquid fuels，The burners are arranged on both sides of the furnace。 Trolley type furnace is divided into trolley type heating furnace and trolley type heat treatment furnace according to use。Car type heating furnace
2015-02-18 Reading quantity 2790
introduction：INAbearing[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 gap between the jacket and the sealing cover is large、Oil spill、Change color、Bearing displacement、laceration、Rust and so on。Once the appearance fault feature is found during the check，We must judge carefully and carefully，Determine the exact location of the fault。The gap between the outer ring of the shaft end and the two sealing covers is too large，Find the front and rear ends of the bearing outer ring and seal
2015-02-18 Reading quantity 1536
introduction：The sealing material should meet the requirements of the sealing function。Due to the different media being sealed，And the working conditions of the equipment are different，Sealing materials are required to have different adaptability。The requirements for sealing materials are generally： 1） The material has good density，Non-leakage medium； 2） Have appropriate mechanical strength and hardness； 3） Good compressibility and resilience，Small permanent deformation； 4） Does not soften at high temperatures，Do not salvage，It does not harden at low temperatures，Non-brittle crack； 5） Good corrosion resistance，In acid，alkali，Oil and other media can work for a long time，Its volume and hardness change little，And does not adhere to the metal surface；
2015-02-18 Reading quantity 1551
introduction： The rate zone centrifugation method is to load density gradient medium into the centrifuge tube before centrifugation（Like cane sugar、glycerin、KBr、CsClEtc.），The sample to be separated is laid on top of the gradient liquid、Bottom of centrifuge tube or middle of gradient layer，Centrifuge with gradient liquid。After centrifugation near the axis of rotation（X1）The medium density is the smallest，Farthest from the axis of rotation（X2）The medium has the highest density，But the maximum density of the medium must be less than the minimum density of particles in the sample，namelyρP＞ρm。This method is based on the different sedimentation rates of the separated particles in the gradient liquid，The particles with different settling velocity are placed in different density gradient layers
2015-02-18 Reading quantity 2904
introduction： Fasteners are a type of mechanical parts used for fastening connections,Extremely widely used.Fastener characteristics：:Various varieties and specifications,Performance uses vary,And standardized、serialization、The degree of universality is extremely high。therefore，There are also people who have countries（profession）A standard class of fasteners is called standard fasteners，Referred to as standard parts。 Due to the specifications of each specific fastener product、dimension、allowance、weight、property、Surface condition、Marking method，And acceptance inspection、Specific requirements for items such as marking and packaging，It is regulated separately in several countries（profession）In standard，For example, there is the imperial system、German system
2015-02-18 Reading quantity 2792
introduction：Electromagnetic clutch we will use often，In this way, the electromagnetic clutch must be adjusted at any time，Since we need to adjust the control，Problems are inevitable，So how do we pay attention to the problems that occur when we adjust，What should we pay attention to at ordinary times。 Electromagnetic clutch is a kind of coil on and off to control the clutch engagement and separation。Electromagnetic clutch、The friction disc of the brake is worn after long-term use，Cause the gap between the electromagnet and the armature to increase，Elongate the compression spring length，This will reduce the elasticity，Cause to slip。At this time, the gap increases，Not only armature coil suction
2015-02-18 Reading quantity 2890
introduction： Sluice valve Gate valves are used as cut-off media，The whole circulation is straight through when it is fully open，At this time, the pressure loss of medium operation is minimal。Gate valves are generally suitable for use without frequent opening and closing，And keep the ram fully open or fully closed condition。Not intended for use as a regulator or throttling。For high speed flowing media，The damper can cause vibration of the gate when it is partially opened，The vibration may damage the sealing surface of gate and valve seat，The throttling will cause the ram to be eroded by the medium。structurally，The main difference is the form of the sealing element used。Depending on the form of the sealing element，Gate valves are often divided into
2015-02-18 Reading quantity 2895
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