Over head crane technical
introduction1
Design standards Crane design standards are state standards and
applicable standards and requirements from user.
1.1 Crane design,
construction and inspection and test standards are as follows.
GB3811-83............ lift equipment design
standardGB/T14405-93...... general over head crane
standardGB/T14407............ general overhead crane and gantry
crane operator cabin standardGB6067-85............ lift equipment
safety design standardGB10183-88.......... over head crane and
gantry crane construction and rail installation
toleranceGB12602-90.......... lift equipment overload protective
device standardGB5905-86............ crane test
standardGB8918.................. steel rope
standardGB5972-86............ lift equipment steel rope inspection
and desert standardGB7592-87............ general over head crane
dimension standardGB8923-88............ steel surface rusty grade
and rust deleting grade before painting treatmentSDZ
014................ general painting standardGB9286-88............
colored paint and paint film case inscription
testGB1497-85............ low voltage electric apparatus
standardJB/DQ4658-91...... crane resistor set
standardJB/DQ6146-86...... crane control tableJB/ZQ2007-90......
crane electric circuit drawing standardQ/DQ109-92.......... crane
electric devices technical standardJBZ299-78............. mines and
project lift equipments paint color and safety
signsGB/T13384............ general electrical and mechanical
product package technical standardASEM and so on equivalent
standard can also be followed for design, manufacture and testing.
1.2 General
specificationNo.specificationnumbernote1QD30t-30m M51
set 2
Technical outlineOur company is a special crane maker. Designing
work is done by engineering department. Crane computer aided design
standards are based on user technical parameters and use
environment conditions. Construction standard is
GB/T14405.3
Over head crane technical introduction
3.1 Steel structure
3.1.1 Bridge structure include main girder
and end beam. Main girder is middle rail box girder with static
rigidity less than s/800 within class A4 and class A6 and static
rigidity less than s/1000 for class A7. Full loaded self-vibration
frequency is no less than 2Hz.Out side of girder has walkway and
guard rails. Crane travel devices and girder electric apparatus are
set on walkway. Crane arrangement and profile is reasonable and
beautiful. 3.1.2 End beam is box girder
which is bolted with high strength bolts.
3.2 Crane
mechanisms3.2.1 In hoist mechanism,there
are electric motors, brakes, couplings and transmission shafts,
reducers and winding drum, steel wire and hook set, and stationary
pulley. A. Winding drum is made of cast steel or rolled
steel plate and steel wire flat angle is no more than 3.5°. There
are at least two rounds of safety steel wire. Press pads and bolts
are stable and reliable. B. Hoist mechanism has extreme
position limit with rotary switch. C. Hoist mechanism has CLZ
gear couplings; crane and trolley travel mechanism is CL and CLZ
type.3.2.2 Trolley travel
mechanism Trolley is separate driving type. Wheel
is double rim type and bumper is spring
type.3.2.3 Crane travel mechanism
Crane is four-drive type, and wheel has double
rims .Bearing shell is angle shape. Bumper is hydraulic anti-crash
type.3.3 Key components
3.3.1 Electric motor is YZP series with
rated volt of 380 v and 50Hz, insulation degree is F grade and
protective grade is IP44.This type of motor has bigger over load
capacity and mechanical strength and is suitable to equipments
which start and stop frequently or with over load and obvious
vibration and crash. 3.3.2 Brake is YWZ
series with hydraulic normal closed thruster, lift mechanism has
manual release device. Brake has constant features, longer use life
and ease of maintenance required in GB6333-86.
3.3.3 Reducer has ZQ type and ZSC type
required in ZBJ19010. 3.3.4 Crane hook is
forged material required by GB699-65 and GB1051.
3.3.5 Pulley material is HT150 cast
required by ZBJ80006-87 and ratio of pulley and steel wire is no
less than 22.4.3.3.6 Winding drum is HT200
cast required by ZBJ80007-87 3.3.7 Steel
wire of 6w(19) type is required by GB1102-74 with strength within
1400~1700N/mm2.Safety factor from 5 to 7 should be applied
according to mechanism class.3.3.8 Wheels
set standard is GB4628-84 and wheel material isZG50SiMn.Tread
hardness is within HB300 and HB 380 and more than HB260 in depth of
20mm. 3.3.9 Material of brake wheel in lift
mechanism is #45 steel at least in GB699.Brake wheel surface
hardness is within HRC45 and HRC 5 5,and HRC40 in depth of 2mm.
3.3.10 Material of major components such as main girder and
end beam and trolley frame meet standards of GB700-88 and GB1591-88
as follows. Components Significant componentsOther componentsWork
ambient
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