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introduction：【Abstract of a paper】This paper discusses the adoptionPLC PCControl powder coating production line。The surface treatment is described、Drying oven、Control principle of curing furnace and powder spraying。coalescePLC PCThe implementation of control system is introduced。 Our company mainly produces white household electrical products(refrigerator、Washing machine、Electric water heater and some small household appliances)The company has four powder spraying automatic production lines。The refrigerator company uses Nordsons friction gun spraying system，Is the largest in the country、The only flat coating line；Washing machines and water heaters use Nordson vertical electrostatic powder coating systems，And hot
2015-03-08 Reading quantity 2793
introduction：CNC machine tools are generally made ofNCControl system、Servo drive system and feedback detection system3 Partial composition。The servo performance required by the position system of CNC machine tools includes：Positioning speed and contour cutting feed speed；Positioning accuracy and contour cutting accuracy；Finish the surface roughness；Stability in the face of external interference。These requirements mainly depend on the static state of the servo system、Dynamic characteristic。For a closed loop system，It is always hoped that the system has high dynamic accuracy，That is, when the system has a small position error，The moving parts of the machine react quickly。The following position control system affects the machining requirements of CNC machine tools in several aspects are discussed
2015-03-08 Reading quantity 2883
introduction： 20century80age，China has introduced a large number of foreign boiling granulator dryers，And on the basis of the same type of product digestion and absorption、Improved design into a new type of drying equipment，Domestic commonly known as one step granulator。 Because the one-step granulator equipment is easy to operate，Superior performance，well-made，Especially to meet the pharmaceutical、Food industryGMPSpecification requirement，Zonpharma、Food field users welcome，Plus our products compared with developed countries，It has obvious price advantage，therefore，Domestic and foreign food and feed production enterprises attach great importance to such drying equipment，Its demand is expanding。 One step granulator equipment is especially suitable for
2015-03-08 Reading quantity 2786
introduction：Cochlear gear reducer general selection220#Gear oil，On some heavier loads，Start frequently，Use a poor environment reducer，The factory also uses some lubricating oil additives(Like Anji Chemical company will be fine)，When the reducer stops running，Gear oil is still attached to the gear surface，Form a protective film to prevent heavy loads，Low speed，High torque and metal-to-metal contact during start-up。The additives also contain sealing ring adjuster and anti-leakage agent，Keep the seal soft and flexible，Effectively reduce lubricating oil leakage
2015-03-08 Reading quantity 2874
introduction：A centrifugal separator with a number of concentric separation chambers in a rotating drum。This separator is specially designed to clarify suspensions containing small amounts of solid particles，Its overall structure is similar to that of the disc separator，It is characterized by a ring gap separation chamber composed of several concentric cylinders in the drum（See picture[Diagram of a chamber separator]）。The flow channels of each separation chamber are connected in series，The cross-sectional area or radial spacing of each ring gap is equal。The drum wall and the drum wall of each separation chamber have no holes2～7Separate chamber,Large settling area，Good clarifying effect，There is also more room for sediment。The separation factor is up to a maximum8000。Operational hours，The suspension is fed from the central feed pipe
2015-03-08 Reading quantity 2818
introduction：Plastic plasticizing screws are divided into three sections according to their geometric appearance： 1、Feed area(feed zone) This section is the groove depth of the fixed screw groove，Its function is responsible for preheating and plastic solid conveying and pushing。It must be ensured that the plastic begins to melt at the end of the feed section(That means preheating to melting point)。 The length of this section is divided into crystalline(POM、PA‧‧Etc.)>amorphous(PS、PU、ABSEtc.)>Heat sensitivity(PVCEtc.)。 Generally speaking： amorphous：about48~58%L……(AS、ABS、PSEtc.
2015-03-08 Reading quantity 2898
introduction： one、GB/T2423 Have the following51Individual standard composition： 1 GB/T 2423.1-2001 Environmental testing of electrical and electronic products The first2section: Test method testA: hypothermy 2 GB/T 2423.2-2001 Environmental testing of electrical and electronic products The first2section: Test method testB: hyperthermia 3 GB/T 2423.3-1993 Basic environmental test code for electrical and electronic products testCa:Constant damp heat test method 4
2015-03-08 Reading quantity 2793
introduction：Heat exchangers with plates and fins as heat transfer components。It is mainly composed of a plate bundle and a seal(See picture Schematic diagram of structural decomposition of plate-fin heat exchanger )。There are several channels in the beam。Fins are placed between the two plates of each layer channel﹐And seal on both sides with seals。Depending on how the fluid flows﹐cold﹑The hot fluid channel spacing is superimposed﹑Arranged and welded into a whole﹐It is made into a bundle of plates。Two fluid flow modes with countercurrent﹑Cross flow and cross current, etc。A﹑BThe fluid is respectively introduced into the respective beam channel by the inlet head through a distributive section of the baffle﹐Then it is led out by the guide vane of another distribution section to the outlet head﹐The two fluids present a countercurrent partition
2015-03-08 Reading quantity 2816
introduction： In the middle of an engine overhaul，Bearings must be replaced[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。]（watts）。The replacement of bearings includes two stages: matching bearings and machining bearings。 one、Crankshaft bearing seat hole inspection and bearing selection 1、Before bearing selection，First check whether the bearing seat hole meets the standard
2015-03-08 Reading quantity 1456
introduction： The lubrication methods of steel rolling equipment are mainly divided into thin oil lubrication and dry oil lubrication。 1 Thin oil lubrication system The thin oil lubrication system of steel rolling equipment can be divided into two kinds: single type and centralized type。 Centralized thin oil lubrication system is the most perfect lubrication system，It has the following advantages：(1)A large number and wide distribution of lubrication points can be lubricated。(2)Continuous cycle lubrication of the unit，Can take the heat away from the friction parts，Carry out cooling。(3)Because of the pressure supply of oil，It can ensure timely and reliable lubrication of friction parts。(4)Proper lubrication，Less lubrication material consumption。(5)All lubrication work can be automatically controlled，Greatly reduce
2015-03-08 Reading quantity 1463
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