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introduction：In a cycle of a piston machine，The gas pressure in the cylinder moves with the piston（Or cylinder content volume）And the cyclic curve of change。The area enclosed by the cyclic curve can be expressed as the work done or the work consumed by the machine，Therefore, it is called indicator diagram，It can be recorded with indicator。The indicator diagram shows in addition to the amount of work done or work consumed，It is often used to analyze and improve the working process in the cylinder。 Internal combustion engine indicator diagram1a[Indicator diagram of internal combustion engine]It is the actual indicator diagram of four stroke internal combustion engine。The ordinate indicates the gas pressure in the cylinder,The horizontal coordinate indicates the working volume of the cylinderV。Line segment1-2
2015-03-23 Reading quantity 2780
introduction：China is a major energy producer and consumer in the world，Energy saving is urgent。We need to fundamentally address energy constraints，To meet the needs of sustained and rapid economic growth，We must persist in saving money，We will also develop new technologies and materials，Take a low-energy leapfrog development road，Build a conservation-oriented society。 We actively study the thermal insulation of door and window curtain wall structure at the same time，It must be realized that the development of high-tech new materials is an important basis for building energy conservation，Only materials with excellent properties，In order to ensure the lasting thermal insulation performance of the external protection project，Ensure the energy saving effect of the whole building project in its whole life cycle。 Carry out construction
2015-03-23 Reading quantity 2889
introduction：Flame retardant chemicals have been successfully used in plastics for fire resistance and flame retardancy，Reduce the danger and damage to human life and property。But adding flame retardants does not make plastic a non-combustible material。 The requirement of flame retardant is to increase the resistance of plastics to people，Reduced combustion rate。These requirements are the basis for flammability test methods and industrial testing of plastic flame retardancy。 halogen（Such as chlorine、Australia）、Phosphorus and water have the best flame retardancy。Their flame retardancy can also be modified by the following synergists，For example，antimony、Reinforced by zinc and other selected metal salts。 The role of flame retardants is realized in many ways。Some flame retardants help
2015-03-23 Reading quantity 2794
introduction：A crane route laid by rail﹐It can ensure that the crane runs along the specified line﹐And transfer wheel pressure to the foundation。The track usually consists of two steel rails﹐A crane with a heavy load﹐For example, the track of a large cable crane is composed of multiple steel rails。Depending on the purpose and type of crane﹐Ordinary railway rails can be used﹑Special crane rail(See picture Crane rail )Or rails with square and rectangular sections。Compared with ordinary railway rail﹐Special crane rail head width﹑Small height﹑Waist of rail﹐It helps to improve the contact with the wheel﹐And conducive to withstand horizontal load﹐But the price is more expensive。Ground running up
2015-03-23 Reading quantity 2777
introduction： 1introduction In the steel industry production，Blast furnace、The gas produced by coke ovens and converter is an important high calorific value fuel，If discharged into the atmosphere，Will cause serious air pollution，If they are collected and put to good use，Used as fuel for various industrial gas heating furnaces，Its economic benefits are considerable。The general treatment process is to collect the various types of gas produced separately into the gas tank(Or gas tower tank)Then the pipeline is transmitted to the relay station and pressurized for each user to use。When from primary energy(coaly)Converted into secondary energy(gas)when，Because the primary energy is unstable，Secondary energy is inevitable in the conversion process(coal
2015-03-23 Reading quantity 2870
introduction：one、Test format The maximum test area should be exceeded18×20″。In particular, factories that often do oversized plates and flying needle test foundry centers，This type of machine with a large test area should be considered。 two、Test the accuracy of the machine Machine accuracy should pay attention to the understanding of different labeling methods。The general labeling method is：Accuracy nominal（Resolution，repeatability）、Minimum testPADdimension、Minimum pad spacing。For other ways of labeling must be clearly explained by the manufacturer，Prevent misunderstanding。The accuracy of the medium and high level flying needle test machine is generally2mil，Minimum testPADThe size is...6~8 mi
2015-03-23 Reading quantity 2908
introduction：1、Shaft and 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。]Selection and control of room tolerances SKFbearing[SKFbearing:SKFThe full name is“Svenska Kullager-Fabriken”The Chinese transliterated name is“SKF”；SKFThe group is headquartered in Gothenburg, Sweden，Yes bearing
2015-03-23 Reading quantity 1507
introduction：1.The process of cylindrical roller Blank forming→Deburring or banding→Soft grinding raceway surface→Soft grinding double end face→Heat treatment→Roughing the rolling surface before→Coarsely ground double ends→After coarse grinding rolling surface→End grinding double end→fine、Final grinding rolling surface→Super finishing rolling surface→cleanse、desiccation→Final inspection appearance、Size grouping→Oiled package。 2.The process of conical roller Blank forming→Deburring or banding→Soft grinding raceway surface→Soft grinding double end face→Heat treatment→Rough grinding rolling surface→Fine grinding rolling surface→Grind the ball base→Final grinding rolling surface→Super finishing rolling surface→cleanse、desiccation→Final inspection appearance、dimension
2015-03-23 Reading quantity 1564
introduction： pick to: The experiment proves that the blank is tight by tension，The possibility of forming a flat inclined wall without contact with the tool。The flatness of the inclined wall is guaranteed by plastic drawing。The mold structure of the process was developed。A die with a movable punch is mounted on a press of a high power buffer to clamp the edges of the blank。 keyword: Slot section parts;stamping;Mold structure 0introduction Sheet material profile with small length，And slot section parts(figure1)It is traditionally used in special molds1sub-or2Secondary stamping
2015-03-23 Reading quantity 2799
introduction：Some users have broken the output shaft of the drive motor after several months of operation of the equipment。Why did the reducer break the output shaft of the drive motor？For this purpose we looked at the output shaft cross section of the drive motor，It is found that the cross section of the output shaft of the reducer is almost exactly the same。The outer ring of the cross section is brighter，And the more toward the axis of the section color darker，It breaks at the end of the shaft！figure2Its a cross-sectional photo。This fully shows that the main reason for the broken shaft of the output shaft of the drive motor is that the motor and the reducer are assembled differently！ When the concentricity between the motor and the reducer is guaranteed to be very good，Motor output bearing[bearing:shaft
2015-03-23 Reading quantity 2882
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