新版轮机英语课件

新版轮机英语课件1 1新版轮机英语课件2 2 Anchor handling equipment The windlass（锚机）is the usual anchor handling device where one machine may be used to handle both anchor.Anchor handling equipment The3 3A more recent development,particularly on large vessels,is the split windlass where one machine is used for each anchor.A more recent development,pa4 4One unit of a split windlass(分离式锚机）is shown in Fig.25-1.One unit of a split windlass(分5 5新版轮机英语课件6 6The rotating units consist of a cable lifter(锚链轮）with shaped smug（凸起）to grip the anchor cable（锚链）,The rotating units consist of 7 7a mooring drum（绞缆筒）for paying out（放松）or letting go（放出）of mooring wires and a warp end for warping duties.a mooring drum（绞缆筒）for paying8 8Each of these units maybe separately engaged（啮合）or disengaged by means or a dog clutch（牙嵌离合器）,although the warp end is often driven in association with the mooring drum.Each of these units maybe sepa9 9A spur gear（正齿轮）assembly transmits the motor drive to shaft where the various dog clutches enable the power take-off.A spur gear（正齿轮）assembly tran1010Separate band brakes（独立式刹车）are fitted hold the cable lifter and the mooring drum（绞缆筒）when the power is switched off.Separate band brakes（独立式刹车）ar1111新版轮机英语课件1212The cable lifter unit（锚链轮）,show in Fig.25-1,is mounted so as to raise and lower the cable from the spurling pipe（锚链管）,which is at the top and center of the chain or cable locker（锚链舱）.The cable lifter unit（锚链轮）,s1313Details of the snugs（卡块）used to grip the cable and band brake（带式刹车）can be seen.Details of the snugs（卡块）used 1414Anchor capstans（起锚绞盘）are used in some installations where the cable lifter rotates a b o u t a v e r t i c a l a x i s.Anchor capstans（起锚绞盘）are used1515新版轮机英语课件1616Only the cable lifter unit is located on deck,the driving machinery（驱动机械）being on the deck below.Only the cable lifter unit is 1717A warping end or barrel may be driven by the same unit and is positioned near the cable lifter.A warping end or barrel may be1818The efficient working of the anchor windlass is essential to the safety of the ship.An anchor windlass can expect to fulfill（满足）the following:The efficient working of the a19191.The windlass cable lifter brakes must be able to control the running anchor and cable when the cable lifter is disconnected from the gear during“letting go”（放锚）.1.The windlass cable lifter br2020Average cable speeds vary between 5-7 m/sec during this operationAverage cable speeds vary betw21212.The windlass must be able heave a certain weight of cable at a specified speed（额定转速）.2.The windlass must be able he2222This“full load”duty of the windlass varies but is commonly between 4 and 6 times the weight of one anchor,the speed of haul being at least 9 m/min up to 15 m/min.This“full load”duty of the w23233.The braking effort（刹车效果）obtained at the cable lifter must be at least equal to 40 percent of the breaking strength of the cable.3.The braking effort（刹车效果）obt2424Most anchor handing equipments incorporate（包含）warp ends for mooring purposes（系泊）and line speeds of up to 0.75 to 1.00 m/sec are required.Most anchor handing equipments2525The most conventional types of equipment in use are as follows.The most conventional types of2626WindlassesThis equipment is self-contained（独立的）and normally one prime mover drives two cablelifters and two w a r p e n d s（绞 缆 端）,WindlassesThis equipment is se2727t h e l a t t e r m a y n o t b e declutchable（离合装置）and,if so,rotate when the cablelifters a r e e n g a g e d.the latter may not be declutch2828There is some variation in detail design of cable lifters and in their drives.There is some variation in det2929Due to the low speed of rotation required of the cablelifter whilst heaving anchor,Due to the low speed of rotati3030(345r/min)a high gear reduction(齿轮减速机构）is needed when the windlass is driven by a high speed electric of hydraulic motor.(345r/min)a high gear reducti3131This is generally obtained by using a high ratio worm gear（涡 轮）followed by a single step of spur gears（单级正齿轮）between the warpend shaft and cablelifters.This is generally obtained by 3232Alternatively,multi steps of spur gears are used.Alternatively,multi steps of 3333Capstans（起锚机）with this type of equipment the driving machinery is situated below deck and the cablelifters are mounted horizontally being driven by vertical shafts.Capstans（起锚机）with this type o3434Mooring winchesMooring winches provide the facility for tensioning the wire up to the stalling capacity（堵转转矩）of the winch（绞车）,usually 1.5 times full load（全 负 荷）,Mooring winchesMooring winches3535thereafter the load is held（握持）by the prime mover brake or barrel brake when the power is shut off.thereafter the load is held（握持3636The winch cannot pay out wire unless the brake is overhauled（超越）or recover wire unless manually operated,thus wires may become slack.The winch cannot pay out wire 3737The majority of automatic mooring winches（自动系缆机）are spur geared（正齿轮）to improve the backward efficiency of the gear train for rendering,The majority of automatic moor3838the gearing（齿轮机构）and bearings being totally enclosed and lubricated from the oil sump.the gearing（齿轮机构）and bearings3939On larger mooring winches where a barrel brake is fitted,it is now common practice to design the brake to withstand the breaking strength of the mooring wire.On larger mooring winches wher4040Worm geared（涡轮蜗杆）automatic mooring winches are uncommonWorm geared（涡轮蜗杆）automatic mo4141as the multistart（多次起动）feature required to improve gear efficiency reduces the main advantage of the worm gear i.e the high gear ratio（传动比较高）.as the multistart（多次起动）featur4242Winches with various arrangements of barrels are the usual mooring equipment used on board ships.Winches with various arrangeme4343A mooring winch is Fig.25-2 where the various parts can be identified.A mooring winch is Fig.25-2 wh4444The winch barrel or drum is used for hauling（收紧）in or letting out the wires or ropes which will fasten the ship to the shore.The winch barrel or drum is us4545The warp end is used when moving the ship using ropes or wires fastened to bollards（系缆桩）ashore and wrap around the w a r p e n d o f t i l e w i n c h.The warp end is used when movi4646新版轮机英语课件4747The construction of a mooring winch will now be examined,again with respect to Fig.25-2.The construction of a mooring 4848The motor drive is passed t h r o u g h a s p u r g e a r transmission（直齿轮传动机构）,a clutch and thus to the drum（卷筒）and warp end.The motor drive is passed thro4949A substantial（坚实的）frame supports the assembly and a band brake is used to hold the d r u m w h e n r e q u i r e d.A substantial（坚实的）frame suppo5050The control arrangements for the drive motor permit forward or reverse rotation together with a selection of s p e e d s d u r i n g o p e r a t i o n.The control arrangements for t5151Modern mooring winches are arranged as automatic self tensioning units（自动张紧装置）.Modern mooring winches are arr5252The flow of the tides（潮）or changes in draught（吃水）due to cargo operations may result in tensioning or slackening of mooring wires.The flow of the tides（潮）or ch5353To avid constant attention to the mooring wires the automatic self tensioning arrangement provides for paying out(releasing)or recovering wire when a pre-set t e n s i o n i s n o t p r e s e n t.To avid constant attention to 5454