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introduction：19century30The commercialization of cellulose nitrate microfiltration membranes。 1953University of FloridaReidReverse osmosis desalination was first proposed by others。 1960Loeb, University of California(Loeb)With Sura Rajan(Sourirtajan)The first generation of asymmetric cellulose acetate membranes with high performance was invented，Reverse osmosis(RO)First used in seawater and brackish water desalination。 1961United StatesHevensThe company preferred to propose a manufacturing method for tubular membrane components。 1965The University of California produced a tube for the desalination of brackish water
2015-03-11 Reading quantity 2902
introduction：Chinas metallurgical industry to meet the increasing demand for building steel，In recent years, dozens of high-speed wire production lines have been introduced from abroad，Discharge port speed from63～100m/svary，The annual output is mostly in60×104～100×104tamong。Because of the special work of high line rolling mill，For matching bearings[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，Used to reduce the coefficient of friction during power transmission and to keep the shaft in
2015-03-11 Reading quantity 1450
introduction： Double row aligning roller 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。]Its a precision part.，Its use must also be carried out with corresponding care。No matter how high performance bearings are used，If used improperly，You dont get the high performance you expect。The use of bearings should be noted as follows。 Double row aligning roller bearing one move、Take the outer ring from the inner ring
2015-03-11 Reading quantity 1559
introduction： A mechanical transmission that uses the friction between the flexible ring band and the pulley to transmit power and motion。 type According to the cross-section shape of the flexible belt﹐Belt drive can be divided into flat belt drive﹑Triangle belt drive and circular belt drive。Among them, flat belt drive and triangular belt drive are the most widely used﹐Circular belt drives are used to deliver only a small amount of power。The main features of belt drive are﹕Smooth transmission﹐Large distance between transmission centers﹐Low noise﹐Simple structure﹐Cushioning impact﹐When overloaded, the flexible belt will slip to avoid damaging the device﹔But it does not guarantee an accurate transmission ratio。Besides the above3Kind of ordinary belt drive outside﹐There are some special
2015-03-11 Reading quantity 2788
introduction：Stuffing box seal A contact dynamic seal for reciprocating or rotating motion with a filler blocking a leakage path﹐Mainly soft packing seal(figure1 Soft packing seal )And hard packing seal(figure2 Hard packing seal )Two types of。Soft packing seal is also called packing seal﹐The packing gland in the stuffing box is expanded radially by the axial force of the compression cap﹐To achieve the purpose of sealing。Soft fillers are often made of fibers(asbestos﹑Nylon et al)﹑lubricant(graphite﹑Molybdenum disulfide﹑Talc powder, etc)And a variety of wire reinforcement。Packing wear can be compensated by tightening bolts。Soft packing seal structure is simple﹑reliable﹑Easy to inspect﹑Corrosion and resistance
2015-03-11 Reading quantity 2790
introduction：one、The influence of gear machining in the reducer on the noise of the reducer noise on the smoothness accuracy of the work、Gear contact accuracy、The motion accuracy of the gear、Assembly accuracy and other aspects have a great impact，If you want to reduce the noise of the reducer, you must know the cause of the noise，The noise of the tachometer is due to the periodic alternating force on the bearing generated by the meshing of the gear inside the machine during its operation[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，To reduce power transmission
2015-03-10 Reading quantity 2897
introduction： A mechanism used to control the direction of travel of various wheeled or tracked vehicles。The steering mechanism of wheeled vehicles is generally composed of steering gear and steering rod system。When using power steering﹐A hydraulic pump is also required﹑Operating valve﹑Function tank and oil storage tank﹐Collectively called hydraulic booster mechanism。 Steering mode The steering mechanism of wheeled vehicles has shaft steering﹑Wheel steering and articulated steering 3class。Axle steering is used on early cars and some modern full-trailers。This type of steering involves several wheel axes intersecting at one point during steering﹐But the wheel displacement is too large when steering﹐High steering resistance﹐Tires are worn out﹐So it doesnt work at high speeds
2015-03-10 Reading quantity 2786
introduction： one、Overview of high speed cutting technology 1931years4German physicistCarl.J.SalomanHigh-speed cutting was first proposed（High Speed Cutting）The theory of，He applied for a patent in the same year。He points out：Within the range of conventional cutting speeds，The cutting temperature increases with the increase of cutting speed，But after the cutting speed is increased to a certain value，The cutting temperature will not increase but decrease，And the cutting speedVCIt is related to the type of workpiece material。There is a speed range for each workpiece material，At that speed
2015-03-10 Reading quantity 2782
introduction：The strength of the valve refers to the ability of the valve to withstand the pressure of the medium。Valves are mechanical products that withstand internal pressure，Therefore, it must have sufficient strength and stiffness，To ensure long-term use without rupture or deformation。 Common valve technology has perfect product structure characteristics，Its strength performance is the ultimate standard strength performance of the valve。 Sealing performance The sealing performance of the valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium，It is the most important technical performance indicator of the valve。There are three sealing parts of the valve：The contact between the opening and closing member and the sealing surface of the valve seat；Packing with valve stem and packing box
2015-03-10 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 raceway sound and its control method the raceway sound is when the one-way bearing is running，A smooth continuous sound made by its rolling body rolling on the raceway surface，It is a basic sound unique to all rolling bearings。The general bearing sound is the raceway sound plus other sounds。 bearing
2015-03-10 Reading quantity 1514
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