Saturday 21 July 2012

Ways to maintain Chain Hoists


Any device that you use needs to be looked upon regularly otherwise it shall not give the optimum level of performance as it is expected to give. The same goes for the ChainHoist and so different points to be kept in mind for the maintenance of it are discussed here.

The following are the points to be kept in mind while using it and mainly during its maintenance:

1. Whenever any new installation or overhauling is done, there should be first trial run and only after that it should be used actually.

2. In normal use, should be carried out prior to 125% of rated load, lifting off the ground about 100 mm, 10-minute static load test and check whether it is normal. 

3. Dynamic test is based on rated load weight, lift and move around for repeated testing, test check the mechanical transmission parts, electrical parts and connecting parts are normal and reliable.

4. In use, the absolute prohibition of the environment is not allowed and more than rated load and nominal closing hour number (120) of cases.

5. In the use of specialized personnel must inspect hoist regularly, found that failure to take timely measures, and carefully recorded.

6. Chain retirement criteria should be decided and strictly followed.

7. Chain oil should be used when a hard brush or small piece of wood is prohibited by hand to direct the work of the rope is oil.

8. The use of worn out parts should be given special attention and change should be made immediately.
There should be also a committee that is responsible for checking this, else it shall create mishaps.

Saturday 14 July 2012

Importance of outriggers in parts of Crane


On the whole the crane comprises of many Crane Parts and their description is outlined here in brief. The prime use of it is to carry or rather move heavy load from one destination to other. It is one of the very commonly used mechanical assistants.

As they are used to lift heavy loads to tall heights so it is important that the truck be completely stable during the lifting operation. The tires donot offer the stability needed, so the truck employs outriggers that act as balances to keep it from leaning too much to one side or the other. They use hydraulics to lift the entire truck, tires and all, off the ground. They are basically comprised of the beam, which is the leg and the pad, which is the foot. Sometimes, "floats" are placed under the pad to dissipate the force of the crane and the load over concrete or pavement. Floats are usually wood planks that are lined up to create a base that is larger than the pad itself.

The outriggers are only one mechanism used to balance the crane during lifting operations. There are also detachable counterweights that can be placed on the back of the crane on the underside of the cab. These counterweights prevent the crane from tipping forward during operation. The amount of counterweight needed for a particular lift is determined by the weight of the load, the radius of the boom and the boom's angle during operation. The 70-ton Link-Belt truck crane has counterweights that come in 4,000-pound sections. The counterweights are only used during lifts; they have to be removed before the truck can be driven. Thus it clear that the backbone of the Crane.