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introduction：SI…E、SA…E、SI…ES、SA…ESType rod end joint 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 structure type and overall dimensions E (is often) Department of
2015-03-06 Reading quantity 1437
introduction：Bearing bush or 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。]It is an important part of sliding bearing，The materials of bearing bush and bearing liner are collectively referred to as bearing materials。Because the bearing bush or bearing bush is in direct contact with the journal，The general journal part is more wear-resistant，Therefore, the main failure form of the bearing
2015-03-06 Reading quantity 1496
introduction：famen qudong zhuangzhi Valve drive valve actuator A device for opening and closing a valve using external power。The purpose of using the drive device is to make the operation of the valve labor-saving and convenient、Fast and reliable，Or realize automatic control and remote control。The basic requirements for the valve drive device are：Torque or thrust can meet the valve opening and closing needs，Precise and reliable control of stroke and torque，The choice of power is suitable for the site situation，The opening and closing actions meet the control requirements，The device itself is light and small。 The valve driving device is divided into multi-circle rotary according to the motion mode of the output shaft、The ministry of
2015-03-06 Reading quantity 2774
introduction：The physical properties of stainless steel are mainly expressed in the following aspects： ①Coefficient of thermal expansion A change in the measuring element of a substance caused by a change in temperature。The coefficient of expansion is expansion－The slope of the temperature curve，The instantaneous expansion coefficient is the slope at a specific temperature，The average slope between two specified temperatures is the average coefficient of thermal expansion。The coefficient of expansion can be expressed as volume or length，It is usually expressed in terms of length。 ②density The density of a substance is the mass per unit volume of that substance，The unit is...kg/m3or1b/in3。 ③Modulus of elasticity Objects can be caused when a force is applied to both edges of a unit length
2015-03-06 Reading quantity 1544
introduction： Heavy duty 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 main points of selection are basically the same as those of high-rigidity bearings。 Application problem of heavy duty bearing，It must be considered in combination with the working characteristics of heavy-duty bearings。Heavy duty bearings often work in a state of high stress，And bearings are sensitive to high stresses，Hence the application
2015-03-06 Reading quantity 1545
introduction： Bearing bush in 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。]Up.，The part directly in contact with the shaft，Bear loads and have relative motion with the shaft。To reduce friction，Wear puts various demands on bearing materials，In addition, the friction coefficient between the friction pairs is small，Wear-resistant should also meet the following points： 1.Should have enough
2015-03-06 Reading quantity 1440
introduction： In order to improve the effect of metal cutting, the workpiece and the tool are injected during the machining process(Or grinding tool)interliquid﹐Also known as cooling lubricant。The main role of cutting fluid is﹕cooling﹕Absorb heat generated during the cutting process﹔oiling﹕Reduce the friction and cutting force between the tool and the workpiece﹐Improve cutting efficiency and tool life﹐Improve the quality of machined surfaces﹔cleanse﹕Clipped chips(Or chips)Wash away﹔rust-proof﹕Make work piece﹑Machine tool﹑The tool is not corroded by the surrounding media。The role of different cutting fluids has its own emphasis﹐Therefore, the appropriate cutting fluid should be prepared and selected according to the specific requirements of cutting processing。 Cutting fluid fraction
2015-03-06 Reading quantity 2799
introduction： 1.Wedge joint type FRP anchor bolt The bolt body is made of unsaturated polyester resin as the basic material，In order to14 mGlass fiber is made of reinforced material。The bolt body has18㎜、20㎜、22㎜、26㎜4Kind of，The general length is1.6—3.0-m，tray、Hold-down ring、Baffles and other accessories are made of fiberglass。 The glass fiber reinforced plastic bolt is anchored in full length，To facilitate the rod body into drilling and mixing，Its head adopts45°bevel。At the tail are mounting trays and pressing rings，Adopt wedge-shaped head structure，Right after the end bar splits，A wooden or fiberglass wedge coated with resin is wedged and bonded
2015-03-06 Reading quantity 1434
introduction：China road transport education has full-time higher education、Full-time secondary professional education、Full-time technical education、In-service employee education and other four basic forms。Full-time higher education mainly trains senior engineering and technical personnel and business management personnel for the road transport sector。The full-time secondary professional education is mainly for the training of secondary engineering and technical personnel and business management personnel in the highway transportation sector。Full-time technical education is mainly to train skilled workers。The education of on-the-job workers is mainly to improve the professional level of on-the-job workers in the highway transport sector，Popularize new technology and knowledge。 At present，The major universities engaged in highway transportation education in China are Xi an Highway
2015-03-06 Reading quantity 2778
introduction：Keshi gansheyi Coriolis interferometer Ksters interferometer The wavelength of krypton light or helium light is taken as the known length，Using the phenomenon of light wave interference(See laser length measurement technique、Flat crystal)High precision length measuring tool for calibrating gauge blocks with fractional weight method。What is measured on the Coriolis interferometer is a fractional fraction of the total number of interference fringes corresponding to the full length of the measure block，Therefore, we need to use the fractional multiplication method to find the full length of the measure block。Start with an allowable error of less than 1The micron length measuring tool measures the measurement value of the measuring block，And calculate the range of variation（For example in98.123
2015-03-06 Reading quantity 2787
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