电梯机房、井道和底坑外文文献翻译、中英文翻译、外文翻译
Machine room，Well and pit of lift
1
Machine room
Normally located on top of well (upper-placed machine room), machine room
includes traction machine, diverter pulley, control cabinet, overspeed governor and
main power control box.
1-1
Control cabinet
Located near traction machine, control cabinet serves as a trailing device and signal
control center, Originally, control cabinet included contactor, relay, capacitor, resistor,
transformer, and rectifier. With rapid development of computer and electronics as
well as wide application of VVVF control technology, optical fiber communication
technology, serial communication and network technology in lift, application of big
scale integrated circuit makes control cabinet smaller in size, stronger in function and
more reliable in operation. Currently, control cabinet is composed of computer
control panel and frequency inverter, to control AC motor in terms of frequency,
voltage and speed (VVVF).
Power supply of control cabinet is introduced from the main power supply in machine
room. Cable leads from the contactor of control cabinet to the motor terminal of
traction machine via conduit. Derived by conduit or channel, lift control signal line
enters well then is transmitted by flat or round traveling cable. Signal exchange
control lines are in well, forming lift control loop. It is required that power line and
weak signal be separated to prevent weak signal from being interfered with when
wiring is made in control cabinet and machine room.
1-2
Overspeed governor
Governor is installed on the ground of machine room, at the side of machine
2
Well
Composed of well wall, well top and well bottom, well is always located inside the
building as moving space for car and counterweight. It is made of concrete, brick or
steel so as to bear mechanical strength.
2-1
Guide rail
Guide rail: it is used to guide car and counterweight in vertical direction and restrict
their horizontal displacement.
Car and counterweight should have at least two rigid steel rails. Guide rails are always
made of cold-rolled T-steel, whose anti-pull strength should range from 370 N/m2 to
520N/m2. Following conditions should be taken into consideration when guild rails
are designed.
When unevenly-distributed load is imposed on rail;
When safety gear is activating;
When loading or unloading is under way;
Guide rail strength, especially anti-pull strength should be considered when safety
gear is activating, while rail deformation should be considered when uneven load is
moving on rail.
2-1-1
Connections between rails
Usually each guide rail is 4m to 5m long. When mounted, guide rails are connected to
each other and fixed by wedge and wedge groove on both sides. Its bottom is fixed
by connecting board. Featuring highly processing precision, wedge and groove serve
to connect and fix; strength of joint is guaranteed by connecting board and bolts.
After connection is completed, no continual gap should exist in joint and joints should
be smooth, if necessary, polished.
2-1-2
Rail support
Rails are connected with well wall by means of rail support which is usually
adjustable to ensure specific distance between rails. Support capacity of rail is related
to the distance between rail supports. For rail with same specifications, the shorter the
distance between rail supports is, the larger the support capacity is. The distance of
rail supports is normally 2.5m, which can be decreased or increased according to
actual circumstances; however, bending deflection for rails must not exceed
maximum allowed value of 6.3mm.
2-1-3
Rail clip
Rail supports are connected with rails by means of rail clip, which is classified into
floating and mold-cast types. Floating type can protect rails from deformation caused
by the intrinsic energy of rails, which derives from rail expansion and constriction due
to temperature change as well as unavoidable precipitation of building. After the
intrinsic energy overcomes friction of boards, rails can extend vertically to reduce
deformation and improve lift installation quality. Mold-cast type is mainly used to fix
sensor vane and final limit switch brackets to avoid their displacement.
2-2
Guide shoe
Preventing car from wiggling on traction rope or deviating under uneven load, guide
shoe is used to make car and counterweight move along rails. If suspension center of
car and counterweight is constant, almost no force is applied on guide shoe. Since
load movement always leads to the change of car center, force produced will be
reflected on guide shoe, making guide shoe lines worn out with lift moving upwards
and downwards.
摘要：
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Machineroom，Wellandpitoflift1MachineroomNormallylocatedontopofwell(upper-placedmachineroom),machineroomincludestractionmachine,diverterpulley,controlcabinet,overspeedgovernorandmainpowercontrolbox.1-1ControlcabinetLocatedneartractionmachine,controlcabinetservesasatrailingdeviceandsignalcontrolcenter...
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作者：设计吧
分类：课程设计课件资料
价格：10光币
属性：11 页
大小：57KB
格式：DOC
时间：2023-02-13
