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introduction：Tang Dequan Tang Dequan (1915～ ) People from Zhenhai, Zhejiang，1915years12month14Born in Shanghai。1937He went to Germany to study at Entertown University，He then transferred to the Department of Power Mechanics at the Federal Technical University of Zurich, Switzerland，1941He received a degree in power Mechanical Engineer。1942At the Blomberg power plant in Switzerland (Brown Borer Co.)Design and research engineer。1948After returning to China，Professor of Electrical engineering, Tongji University、1951The following year, he was appointed professor and director of the Department of Mining Machinery and Electricity of China Institute of Mining and Technology。Established the first mine in China
2015-02-09 Reading quantity 2817
introduction： 1、Microwave extraction mechanism Microwave extraction is the penetration of high frequency electromagnetic waves through the extraction medium，Reach the inside of the extracted material，Microwaves can be quickly converted into heat energy and the internal temperature of the cell rises rapidly，When the pressure inside the cell exceeds the capacity of the cell wall，Cell rupture，Free flow of active components from the cell，It is dissolved in the extraction medium at a lower temperature and then further filtered and separated，The extracted material is obtained。Under the action of microwave radiation, the components of the extracted material accelerate the diffusion to the interface of the extraction solvent，Thus the extraction rate is increased several times，The extraction temperature is also reduced，Maximum extraction quality is guaranteed。
2015-02-09 Reading quantity 2828
introduction：Plastic molding properties Chapter 1 Plastic formability Plastic is the main component of high molecular weight synthetic resin，Under certain conditions（Such as temperature、Pressure etc）A material that can be molded into a certain shape and retains its shape at room temperature。 The properties of plastics according to the surface after heating，Can be divided into thermosetting plastics and thermoplastic plastics two categories。The former is characterized by a certain temperature，After a certain amount of time heating、After pressurizing or adding hardener，It hardens by chemical reaction。The chemical structure of the hardened plastic changes、Hard texture、Insoluble in solvent、Heat no longer softens，If the temperature is too high, it will decompose。The latter is characterized by receiving
2015-02-09 Reading quantity 2803
introduction：In the reducer family，The planetary reducer is known for its small size，High transmission efficiency，Wide deceleration range，High precision has many advantages，It is widely used in servo、step-by-step、Dc and other transmission systems。Its role is to ensure the premise of precision transmission，It is mainly used to reduce speed, increase torque and reduce load/The moment of inertia ratio of the motor。In order to better help the majority of users with a good planetary reducer，In this paper, the causes of shaft breakage of reducer and drive motor are analyzed，And introduced in detail how to install the planetary reducer correctly。 one Broken axis problem in different hearts Some users drive after the device runs for several months
2015-02-09 Reading quantity 2805
introduction：belowNMRVWorm gear The constitution of worm reducer、Description of performance parameters、Usage matters are provided by Dongguan Taiji Reducer Company，For information purposes only。 NMRVWorm gear reducer is an aluminum alloy worm gear reducer，Its main components are as follows： The main components of the aluminum alloy worm gear reducer are oil seals、Oil plug、Worm gear case、Ball 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，Bring down
2015-02-09 Reading quantity 2942
introduction：Peoples Republic of China machinery industry standard JB/T6643-93 1Subject content and scope of application This standard specifies the contact Angle as35oGeneral purpose four-point contact ball 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，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]（d≤300mm）The value of axial clearance。{T
2015-02-09 Reading quantity 1463
introduction： In the past, truck gearboxes didnt have synchronizers，A two-foot clutch is required when shifting gears，Otherwise, only the gears are clattering and cannot be put into gear。What youre talking about，I have to add：Depress the clutch、Release the throttle、disengaging、Full release clutch、In the clutch、Engage a gear。This is a move from low to high gear，If you go from high to low，After releasing the first clutch, an empty throttle should be added，Step on the second clutch。As a result of：In the gearbox，Low hour，The diameter of the active intermediate shaft gear is smaller than that of the passive two-axis gear。uptime，Intermediate shaft gear diameter increased，Two-axis gear phase
2015-02-09 Reading quantity 2810
introduction：one.M50NiLbearing[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。]steel ，The high speed and high temperature of aeroengine have higher requirements for rolling bearings，M50NiLIn addition to the improvement of fracture toughness，Compared with other high temperature quenched bearing materials，The microstructure and fatigue strength are also good。One reason for this isM50iLNot in
2015-02-09 Reading quantity 1466
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。]In the process of use，There are many ways to cause rolling bearings to fail，And rolling bearings in daily use，There are three main types of failure that are most common：fatigued，Plastic deformation and abrasive wear，For these three types of rolling bearing failure forms are described in detail below。
2015-02-09 Reading quantity 1611
introduction：The first2The electrical maintenance technology of CNC machine tool is introduced(Up.) Kaipu Mechatronics Engineering Co., LTD(Peking100011)Liu Yinting Practice without theoretical guidance is blind practice，A theory without practice is an empty theory。 China is engaged in CNC machine tool electrical design、There are tens of thousands of engineers and technicians working on application and maintenance technology，However, due to the complexity of the technology、Diversity and variability as well as some objective environmental factors，In CNC machine tool electrical maintenance technology has not yet formed a mature set、A complete theoretical system。The rapid development of control theory and automation technology，Especially micro
2015-02-09 Reading quantity 2953
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