What is the cause that grab crane grasps line to do not supply power

1. What is the reason why the line is not powered by the grab?

When lifting a heavy object in front to the side, care should be taken to prevent destabilizing overturning.

A: how many causes are there

(1) how does the choice of lifting azimuth affect the stability of lifting operations?

Each arm length has a certain curve.

(2) what are the structural requirements of the grab crane in operation?

What is not necessary for the stability of grab crane operation?

Answer: below normal condition, grab bucket crane front firm sex is better than flank firm sex and rear firm sex, namely front firm sex > flank firm sex > rear firm sex.

Support leg span choice does not need to have stability, the greater the span, the better the stability, the smaller the span, the worse the stability.

If you wish to operate, you should do so only after active sky consolidation measures have been taken.

In the operation of jib grab crane, the standard arm length should be used in a large amount.

(3) what is the characteristic curve of the starting component?

How to choose the characteristic curve of the component?

Answer: when lifting heavy objects, there is an error in the amplitude variation or winding operation procedure;

Wind up, the speed of amplitude variation is too fast;

Over specification, over size and over the use of dynamic moment, there is no need for the stability of lifting operations.

When working in soft sky, should use soft cushion board to extend support power.

Therefore, the operation should be fully extended legs.

When it is necessary to operate with non-standard arm length, the characteristic curve corresponding to the shortest standard arm length should be selected.

Or other relevant materials: type of bridge grab, electric single-beam bridge grab

Answer: rise component characteristic curve is the solid sex of complete machine of grab of type of arm frame type, construction strength and organization strength 3 conditions are drawn integratedly normally.

(4) operators in lifting operations, which line does not need to grab the stability of the crane crane?

Answer: working place is askew or loose can make crane frame splint gas, raise firm sex, answer to put a lot of capacity not to be in the operation of askew road surface.

2, grab crane about common sense:

(1) motor dc relay to review, then easier to review the secondary circuit first small switch jump?

There is no problem with the starting switch, warehouse door travel switch and so on

(2) the zero switch is not in position. One fuse of the master circuit is burnt out. The master circuit contactor is out of order or the coil is burnt out.