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introduction：1 introduction Hydraulic support is powered by high pressure liquid，The utility model relates to a device which is composed of hydraulic components and metal components to support and manage the roof of underground mining face in a coal mine。Its emergence has greatly increased labor productivity，Therefore, it is widely used in the mechanized working face of modern mines。2 Existing system features figure1The schematic diagram of hydraulic transmission system of hydraulic support is shown。figure1 Support hydraulic system schematic diagram 1.upright 2.Safety valve 3.Hydraulically controlled check valve 4.Reversing valve2.1 Initial strut Reversing valve4In ascending post position，The high-pressure liquid sent by the hydraulic pump passes through the liquid-controlled check valve3Entry column1Under the
2014-12-27 Reading quantity 2780
introduction： Recently, some users often consult us about a certain optical 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 question of whether it can be used at the end of its life，Today we are bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）Its in the mechanical transmission process
2014-12-27 Reading quantity 1431
introduction：1、Axial sumNSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe function of the bearing fit is to makeNSKThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(Usually a bearing seat)And rotating part(Usually an axis)Solidify together，Thus, the basic tasks of transferring the load in the rotating state and defining the position of the moving system relative to the stationary system are realized。]Selection and control of room tolerances NSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD
2014-12-27 Reading quantity 1429
introduction： The effective gas supply of the refrigerated dryer can be reached100%，however，Due to the constraints of the working principle，The minimum gas dew point of the refrigerated dryer can only be reached3℃(Pressure dew point)around，And it is greatly affected by the intake air temperature，Every increase in intake temperature5℃，Cooling efficiency will decrease30%，The gas supply dew point will increase significantly。meanwhile，Refrigeration dryers must consume a certain amount of electricity and cooling water。 Adsorption drying devices are mainly：There are two kinds of regenerative drying device without heat and regenerative drying device with heat，They might use up air，Or use electricity，Add up，Energy consumption is higher than refrigerated
2014-12-27 Reading quantity 2787
introduction： 1．Screw loose fixed 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。]Seat bolt。willINAbearing[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
2014-12-27 Reading quantity 1428
introduction：Central air conditioning is provided in the factory，mall，Office building，Entertainment venue，Refrigeration of hotel restaurants and accommodation，Keep the building at a constant temperature，But because of the seasons and the changes of day and night，There are also changes in guest occupancy rates in hotels and restaurants and changes in opening hours of entertainment venues，In this way, there is a significant change in the demand for cooling equipment in the building，The traditional central air conditioning can not monitor the change of the environment and adjust its own energy consumption，In addition, the motor power design has considerable abundance in the process design，That is, the flow and head of the pump are greater than the actual need，Therefore, it is very necessary to install the frequency conversion energy-saving device developed and produced by the company and has obvious energy-saving effect。Change with...
2014-12-27 Reading quantity 2776
introduction：jiben jianshe gaisuan yusuan Capital estimate、budget preliminary estimate and estimate of capital construction To determine the total cost of the construction project，An estimate of the cost of a construction project made at various stages of design with varying degrees of accuracy。It is an important part of the capital construction design document，It is also the basis for determining the planned price of construction projects。 Use of estimates、Budget A method of determining the planned price of a construction project，is
2014-12-27 Reading quantity 2772
introduction： Supply treated air to a specified space﹐To maintain the specified temperature﹑humidness﹐Control dust﹑Equipment with harmful gas content﹐Air conditioning equipment。In the air conditioning unit﹐Purify the air﹑Heating or cooling﹑Drying or humidifying treatment。Due to the consumption of cooling air﹐A refrigerator is required﹐Air conditioning equipment can also be regarded as a kind of refrigeration equipment。According to the composition and adjustment of air conditioning﹐Air conditioning equipment can be divided into centralized and distributed two types。Centralized air conditioning is suitable for large workshops﹑theatre﹑A shop or a building﹑A complex of buildings﹔Decentralized air conditioning equipment is also known as air conditioning units﹐each(Or a few)
2014-12-27 Reading quantity 2786
introduction： Using negative pressure as filter driving force﹐Continuous filter with filter surface on cylindrical drum surface。This filter was originally used in the alkali and mining industries﹐Later the application was extended to the chemical industry﹑Coal and sludge dewatering departments。 figure1 Rotary drum vacuum filter The structure and working principle of the rotary drum vacuum filter are described。It has a horizontal drum﹐Opening of the drum wall﹐The drum head is covered with support plate and filter cloth﹐Forming filter surface。The space under the filter surface is divided into a number of separated fan filter chambers。Each filter chamber has a catheter communicated with the distributing valve。Every time the drum rotates﹐Each filter chamber is connected to the vacuum system and the compressed air system in turn through the distribution valve
2014-12-27 Reading quantity 2774
introduction：Generally speaking，The label on the lubricant is adopted by the American Society of Automotive Engineers（SAE）Oil viscosity classification method。This is a viscosity grade classification，Divide lubricating oil into high-temperature types for summer use、Low temperature type for winter and all-weather type for winter and summer。 The specific classification of lubricating oil is winter oil6Kind of，Summer oil4Kind of，Winter and summer oil16Kind of。 1.Winter oil grades are：0W、5W、10W、15W、20W、25W，symbolWRepresents winter isWinter(winter)rind，WThe smaller the number before，The lower the low temperature viscosity, the better the low temperature fluidity，
2014-12-27 Reading quantity 1445
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