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TCF007 举升机受力分析书

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2021-02-28 18:47
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2021年2月28日发(作者:sx是什么意思)


THE MAIN DESIGN CALCULATING AND CHECK STRENGTH



Part I Data Required




Data Required



Mss


of


the


carrying


device


Rated load



Nominal speed




Mc


Ml


v


Quantity


< p>
55


3500


0.03444








Unit



Kg


Kg


M/s


KN



mm


KN





Steel


rope


break


Fr


force



b


Steel


rope


Dr


diameter


Chain


breaking


Fc


force


b













Part II



Structural design of the supporting structure


According EN 1493:2010 Part 5.7



Note:


“?”


Means EN 1493:2010




(1)



General (


? 5.7.1)



The


design


of


vehicle


lifts


in


relation


to


materials,


construction


and


equipment


shall


be


such


that


a


satisfactory


level


of


safety


is


achieved


under


all


operating


conditions including the failure situations described in this standard. This shall be


demonstrated by calculation. Use of the permissible stress method is allowable.



The


stress,


resulting


from


the


most


unfavourable


load


distribution,


shall


be


calculated for each load bearing part.





For permissible stress see below.






If more the 22 000 load cycles at rated load, need fatigue calculation.





In case of exceptional situation the yield stress divided by a


safety factor of 1.1 is acceptable.




(2)



Loads and forces (


? 5.7.2)



<1> Regular loads (


? 5.7.2.1)





a)



Structure loads



The masses of components of the vehicle lift produce the structural loads.



1)



Loads due to components which are not


moving are considered to


be static


structural loads.









Chain




Carrying Device








The carrying device including the carrying arms is needed.



Mc, the mass of the carrying device is


55



Kg


2)



Loads


due


to


moving


components


are


considered


to


be


dynamic


structural


loads.



See part c) the dynamic forces


b)



Rated load



This vehicle lift



s rated load is


Ml is the rated load




c)



Dynamic forces




φ


=1.1 + 0.34 v = 1.1 + 0.34 *



3500



Kg



0.038



=


1.112



The result is more than 1.151, so choose value as 1.151.



φ


: dynamic factor


v : nominal speed



Note:


φ


is 1.151 maximum




d)



Manual forces



Manual force is produced by operators. This force shall be taken as 1 000 N acting


horizontally at the height of the supporting point. For motor bike lifts this force


shall be 10 % of the rated load, but not less than 300 N.





Fm=


1000



N




Fm: manual force




e)



Effects of accessories



Effects of accessories for the vehicle lift, e.g. jacking beams, of a type approved


by the manufacturer for use on that lift.



No additional accessories





Need addtional data!


f) Effects of inclination





Influence of permissible inclination.









<2> Occasional loads - In-service wind (


? 5.7.2.2)




if use outside , see EN 1493 5.7.2.2, need calculation.













<3>



Exceptional loads



(


? 5.7.2.3)



a)



Out-of-service wind



Need calculation




b)



Action



1)



of the catching device




Spring force = 300N






2)



of the re- raising prevention device




No this function



c)



Test load for:



1)



dynamic test (see EN 1493:2010 6.1.5.2)



Fdt: means dynamic test force



Fdt= 115% * Frl= 1.15 *


Frl



=




























2)



static test (see EN 1493:2010 6.1.5.3)





Fst: means static test force




Fst=150% * Frl = 1.5 *



=









Loads and forces (


? 5.7.3)



The loads defined in 5.7.2 shall be combined and classified as indicated in Table 3.



Table 3



Load combinations




Force


Load



Value


Clause


Load combination



A1


A2


B1


B2


C1


C2



Regular loads




5.7.2.1








F


sls



Structural


loads


a1



1


1


1


1


1


1




static



F


sld



Structural


a2



φ



1


φ



1


1


1



loads-dynamic



F


Rl



Rated load



b



φ



1


φ



1


1


1



F


Mf



F


Ea



F


Ei



F


IW




F


OW



F


cd



F


rpd



Manual forces



Effect


of


accessories



Effect


of


inclination



Occasional


loads



In-service wind



Exceptional loads




Out-of-service


wind



Action


of


the


catching device



Action


of


the


re-raising


prevention device







d


e


f





φ



φ



1


1


1













φ



φ



1









1


1


1


1











1


1





1








1


1







1




C3



1


1


1




1


1









1


5.7.2.2




5.7.2.3




a





b1


b2


















φ


Multiplication factor according to dynamic factor



























Load combinationa A1:



Y -Combination force


X -Manual force


Normal operation (raising/lowering) without wind or special forces




F


A1


= F


sls


* 1 + F


sld


*


φ


+


F


Rl


*


φ


+


F


Ea


*


φ


+


F


Ei


*


φ


=




Load combinationa A2:




Normal operation (service/repair work) without wind or special forces




Y:


F


A2


= F


sls


* 1 + F


sld


*


1 +


F


Rl


*


1 +


F


Ea


*


1 +


F


Ei


*


1 =



X:


F


Mf


=




Load combinationa B1:



Normal operation (raising/lowering) with wind force




F


B1


= F


sls


* 1 + F


sld


*


φ


+


F


Rl


*


φ


+


F


Ea


*


φ


+


F


Ei


*


φ


+


F


IW


* 1 =



Load combinationa B2:




Normal operation (service/repair work) with wind force





Y:


F


B2


= F


sls


* 1 + F


sld


*


1 +


F


Rl


*


1 +


F


Ea


*


1 +


F


Ei


*


1 +


F


IW


* 1=


X:


F


Mf


=




Load combinationa C1:





Vehicle lift out of service with wind force




F


C1


= F


sls


* 1 + F


sld


*


1 +


F


Rl


*


1 +


F


Ea


*


1 +


F


Ei


*


1 +


F


OW


* 1 =


Load combinationa C2:




Action of the catching device




F


C2


= F


sls


* 1 + F


sld


*


1 +


F


Rl


*


1 +


F


Ea


*


1 +


F


Ei


*


1 +


F


cd


* 1 =


Load combinationa C3:




Action of the re-raising prevention device





F


C3


= F


sls


* 1 + F


sld


*


1 +


F


Rl


*


1 +


F


Ea


*


1 +


F


Ei


*


1 +


F


rpd


* 1 =





Table 3-R Load combination result



Load combination result




A1



KN





A2



KN


B1



KN


B2



KN


C1



KN


C2



KN


C3



KN








Loads and forces (


? 5.7.4)





<1> General (


? 5.7.4.1)




The following requirements shall be fulfilled if no special data are specified


by


the


customer.


The


rated


load


shall


be


distributed


on


the


four


corners


of


a


rectangle with the width equating to wheel track and the length to wheel base.




<2> Wheel support vehicle lift for road vehicles (


? 5.7.4.2)



The rated load shall be distributed according to normative vehicle dimensions


as shown in Table 4.


When


carrying


out


structural


design


in


accordance


with


the


data


given


in


Table 4 consideration shall be given in each case to normative vehicles both less


than and equal to the rated load to ensure that the most adverse loading situations


are considered.


For structural


design purposes vehicle positioning on load


carrying devices


shall be considered in both directions.


The vehicle track symmetry axis and the wheel supports symmetry axis are


coincidental.


For


all


normative


vehicles


with


more


than


two


axles,


the


2-


or


3-axle


combinations shall be considered as a single


The


minimum


distance


X


between


the


nearest


vehicle


axle


and


the


wheel


support


end


depends


on


the


type


of


normative


vehicle


(dimension,


single-,


double-, triple- axle) (refer to Table 4).


When calculating for tracks, the plate stresses caused by supporting the loads


shall be taken into account assuming that the load is uniformly distributed on a


square or circular area at a pressure of 50 N/cm2. In the case of a virtual axle the


force to be considered for calculating plate stresses shall be equally distributed on


each axle. Plate stresses need not be considered if the plain area between any two


flanges or supporting sections is not considered when calculating the supporting


cross section.


Structural


design


shall


consider


the


vehicle


driving


on


and


off


wheel


supports.



<3> Chassis supporting vehicle lift for road vehicles (


? 5.7.4.3)




a)







2:3 and 3:2 (maximum load one pick-up point 3/10 of P)



On platform lifts the rated load shall be distributed on the four corners of a rectangle


with the dimensions



of:


―100 cm (width) X140 cm (length); and



―170 cm (width) X 140 cm (length)



at the maximum length of the platform and at the worst condition (with the maximum


load at the corner of



the platform or platform extension).


On


vehicle


lifts


with


carrying


arms


the


rated


load


shall


be


distributed


on


the


four


corners


of


a


rectangle



with


the


dimensions


of


100


cm


(width)


with


the


maximum


load


at


the


maximum


length


of


the


longest


arm



and


the


short


arm


in


the


position


which gives the worst condition.









b)



For rated loads > 3,5 t the load ratios between the front and rear load carrying points


shall be (in both



directions):



1:3 and 3:1 (maximum load one pick-up point 3/8 P)



On


platform


lifts


the


rated


load


shall


be


distributed


on


the


four


corners


of


a


rectangular with the



dimensions of:



―100 cm (width) 180 cm (length); and



―170 cm (width) X 180 cm (length)



at the maximum length of the platform and at the worst condition (with the maximum


load at the corner of



the platform or platform extension).



On


vehicle


lifts


with


carrying


arms


the


rated


load


shall


be


distributed


on


the


four


corners


of


a


rectangle



with


the


dimensions


of


100


cm


(width)


with


the


maximum


load


at


the


maximum


length


of


the


longest


arm



and


the


short


arm


in


the


position


which gives the worst condition.




The maximum load one pick-up point Factor of P - Pf is




<4>


Special


vehicle


lifts


(lifts


for


forklift


trucks,


dumpers,


rail-bound


vehicles, etc.) (


? 5.7.4.1)




-


-


-


-


-


-


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