Q:What role does the tower crane torque limiter play?

The overload protection of tower crane is protected by two equipment, lifting load limiter and torque limiter. The latter generally in the big arm root 4-5 meters to the front of the large arm, overloading (Chao Liju) work, it is more important, basically, the scope of work is torque limiter plays a protective role. While the former is the weight limiter function in the arm root within 4-5 meters, because the tower crane is a jib type crane, each allowing weight lifting position corresponding to the different (CAB load curve). For example, such as 63KN.M, the big arm root 2 meters lifting, the theory is 23 tons, while the torque limiter is not over, but in fact, the tower crane at early crouched down, so the weight limiter in this work.

Q:It seems like every time I turn on the news there is another crane collapse. I don't know if it is the same problem every time, but it seems awfully suspicious. Does anyone know why crane collapses seem so common lately? Has it always been this way?

You okorder .. This chart is not definitive, it leaves out many occupations (such as mining), it only considers fatalities (not loss of limbs, etc.) but it conveys the general picture. For hard data look at: www.bls /iif/

Q:I've heard that if one were to make 1000 paper cranes, then they would get one wish. Is this true?I've been making paper cranes for a few days now.

it's true that there is a belief in folklore that making 1000 paper cranes is lucky,or grants a wish. I can't testify to the actual truth of the folklore as I have never made 1000 cranes,but on the surface, it would not seem to follow the laws of probability or physics.

Q:I have to create a crane to support a dead load for my Engineering Technology class. It can be made out of only 1/8 inch balsa wood and wood glue, and is going to be graded by the ration of weight held to structure weight.Could anybody give me some suggestions as to how to go about designing this thing? I already know most of the basics, but if anybody could give me some specific tips, they would be greatly appreciated.Thanks!

Balsa Wood Crane

Q:I have a Holden 253 and I'm looking at a hydraulic street/strip cam, and I'm wondering which brand is better out of Crow and Crane?Cheers.

crane is they cam i like but they are both good.

Q:Is there a crane big enough to lift Hillary off the yoga matt when she has finished her yoga?

Unfortunatly....

Q:for example: erection, technical data...

Well now Slartybardfast may be tried lol but he is correct give him the points lol.

Q:how do they get counter-weights onto high cranes?

The crane itself hoists them. Suppose a crane is rated to support X tons, then the optimal counter weight would be X/2 tons, an the crane has to be designed to support an imbalance of X/2 tons. If the operational crane is not lifting anything, then it has to support its unbalanced counter weight, and if it lifts its maximum load, then it has to stand an unbalanced load of (again) X/2 -- the other half of the load is balanced by the counterweight. Therefore the crane is capable of hoisting its own counterweight as an unbalanced load. It is then secured in place and the crane can then start operating to its rated maximum lifting capability.

Q:the lenght of beam is 4.5mmaterial of beam is ASTM Gr60

Not enough information. What is the load weight? What is the size? How do you plan to attach to the machine. What size is the beam cross section? Capacity of the cranes? And so on. It sounds like you might need an engineer to supervise instead of relying on Yahoo Answers for an answer to a potentially deadly if not expensive way to fail.

Q:A heavy concrete panel is being lifted into position in a building by means of a crane (see figure below). The tension of 1.78 x 10^4 N in the supporting cable produces a torque with respect to point O. (Let L = 46.3 m.)

The crane contributes a torque of 495,979.8 Newton-meters. 1.78e+4 * 46.3 * cos(53.0) = 495,979.8 ...but this is not the total (net) torque. There is also a torque due to the weight of the concrete slab - torque we are ignoring since we do not know the weight of the slab.