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introduction： Valve procurement only clear specifications、category、Work pressure on the practice of meeting procurement requirements，It is not perfect in the current market economy environment。Because valve manufacturers for product competition，Each is under the idea of unified valve design，Innovate differently，Formed their own enterprise standards and product personality。Therefore, in the valve procurement more detailed technical requirements，Coordinate with manufacturers to achieve consensus，As an accessory to the valve procurement contract is very necessary。 1.General requirement 1.1 Valve specifications and categories，Shall comply with the requirements of the pipeline design document。 1.2 Valve type
2015-02-21 Reading quantity 2788
introduction：suncaoji Mortising machine mortising machine A woodworking machine for making rectangular mortising or circular mortising on wood。The mortising machine has a chain mortising machine、Square chisel mortising machine and waist round mortising machine and so on。 Chain mortise motor drives cutting chain through gearbox and sprocket（Chain with knife teeth）Rotate on the knife holder，The wood clamped onto the workbench（figure1[Chain mortising machine]）,During processing, the tool holder with the cutting chain is lowered to a certain depth, that is, the rectangular mortise is milled out。When machining long slots,Movable table,And the cutting chain is lowered several times
2015-02-21 Reading quantity 2797
introduction： What is the difference between electric electromagnetic brake and power-off electromagnetic brake The working principle of electrified electromagnetic brake is：Magnetic coil time，The electromagnetic force pulls on the brake pads，Use the brake pads to release the disc，At this time the drive shaft with the brake disc normal operation or start。When cutting off the current to the electromagnetic brake，So the brake pads are off the disc，Friction torque is produced between brake disc and brake pads and flanges，Use the drive shaft to stop quickly。 The electromagnetic brake is a split electric type electromagnetic brake and a power off type electromagnetic brake（electromagnetism
2015-02-21 Reading quantity 2908
introduction： one．Classification of greases There are many varieties and brands of greases，To regulate the production of greases，Especially for the convenience of users，It is necessary to unify the classification and naming of greases。There are many ways to classify greases，There are mainly according to the composition、Apply、Performance three kinds of classification methods。 1．By composition 2、Classification by application Grease is divided into main functions：oiling、Defense、Sealing grease； Divided by scope of application：General use、specific
2015-02-21 Reading quantity 1574
introduction： Raw material comparison Plastic is not metal Many plastic designs still remain“Metal parts”The design concept of。At the beginning of the proposal，The author proposes，Compared to other traditional raw materials，Points to pay attention to when designing plastic raw material parts。 Basic characteristics of various raw materials Plastic raw materials more than any other industrial raw materials，Its characteristics can vary over a wide range。By filler、Reinforcing materials and modifiers，Its properties will produce a large transformation。The basic properties of most plastics are clearly different from those of metals。Such as，By direct comparison，gold
2015-02-21 Reading quantity 2793
introduction： play：The amount of clearance between the rolling element and the ring。 precision：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。]Dimensional accuracy and rotation accuracy。 The accuracy of the bearing has a certain influence on the accuracy of the clearance，It has no effect on the size of the clearance。The clearance size is set before the factory。 Radial internal clearance code：
2015-02-21 Reading quantity 1485
introduction：A pressure transducer that brings two gaseous working substances into direct contact and transmits energy through pressure waves。It is used when the internal combustion engine pressurizes the gas entering the cylinder by using the exhaust energy of the internal combustion engine。The gas wave supercharger consists of an air stator、The gas stator and rotor are composed。The air stator is connected to the internal combustion engine intake pipe，The gas stator is connected to the exhaust pipe。The rotor is driven by the internal combustion engine crankshaft via a belt，The driving power is the internal combustion engine power1～1.5％。 figure[Working principle of gas wave supercharger]The working principle of the gas wave supercharger。When the rotor rotates in the direction of the arrow，An axial airway composed of blades on the rotor is connected to the high-pressure gas inlet，completio
2015-02-21 Reading quantity 2891
introduction： Working principle： DWPThe type is jet air belt drying type，Hot air is sprayed down or up to the material on the conveyor belt with slit flow or hole beam，Due to the jet gas belt high15m/sabove，Therefore, the heat transfer film of convective heat transfer is very thin，High heat transfer coefficient，Fast drying speed。The device is used for non-breathable materials，The upper jet stream still returns to the top，The gas from below is still coming back below，recirculation。Drying of permeable materials such as coated cloth，It is also suitable for drying of flake materials and some special materials。If two-way jet is used，Materials such as plates have little deformation after drying。Jet gas
2015-02-21 Reading quantity 2780
introduction： Special shaped tube with one end closed﹐When different pressures are applied inside and outside the tube﹐Deformation occurs within its elastic limit。The spring tube is a pressure detection component in the pressure measuring instrument。It is made of elastic material﹑Bend into CThe shape﹑Spiral and coil spring shaped hollow pipe。The earliest spring tube bent intoCThe shape﹐Because the FrenchE.Borden invented it﹐It is also called Bourdon tube﹐It is still widely used in modern times。Its free end is movable﹐Open end fixation。A fluid passes through the pipe﹐Under fluid pressure﹐The spring tube is deformed﹐The free end generates linear or angular displacement。The measuring range of the spring tube can be from tens of kpa to
2015-02-21 Reading quantity 2798
introduction：Grab with a fork or skewer、Handling and stacking or accessing unit cargo from high shelves（See unitized transport）Special crane。Its a kind of storage equipment（See Material handling machinery），It is divided into bridge type stacking crane and roadway type stacking crane（Also known as roadway crane）Two kinds of。 The bridge stacking crane is developed on the basis of the bridge crane combined with the characteristics of forklift（figure1 [Overhead stacker crane]）。There are lifting forks on rigid posts that hang down from the trolley，The column can be rotated around the vertical center line，So the shelf between the need for roadway width than forklift
2015-02-21 Reading quantity 2798
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