Arrows are the most famous cargo vehicle on ships . Principles of classification of different arrows . So, in domestic shipbuilding distinguish arrows light and heavy . In the Rules of English Lloyd arrows are divided into three groups : small , medium and large capacity .
There are other principles of division, but in the future we will proceed from the adopted in our country division of arrows into two groups Given that the most acceptable feature of the classification is the capacity , letkiman will call arrows with a capacity of up to 10 tons . heavy-weight-more than 10 tons Of traditional options snap ” fishing line arrows and arrows heavyweight shown in the figure. Figure a cargo pendant is used for vertical load transfer , using the topenant the arrow changes the flight or is held with a predetermined angle of inclination , the delay of mn provided by the rotation of the boom around the vertical axis .
Features snap different options of arrows will be discussed below . Sign of classifications arrowheads can be the number of workers movements. Most light arrows have two working movements: lifting (lowering ) the load and moving the load in the horizontal plane when the boom is rotated around the vertical axis . Heavy-duty arrows have a third working movement-the transfer of cargo when changing the angle of the boom. In recent years, there were arrows ” , which is used as the light arrows and the arrows – heavyweights , light and mechanical arrows have three of the workers movement .
The peculiarity of the mechanized arrows is that all three working movements are provided with mechanisms related to the equipment of this boom . Most of the mechanized shafts in the snap , entered the cable or hoist that performs both functions topenant and braces smiling the term ” mechanized In this detailed description of the structural elements of the cargo of illicit small arms , ways of working , methods of calculation of strength and stability of arrows and accessories . In this regard, we will focus only on the features of structures that have appeared in recent years .