tailieunhanh - Ship Knowledge: A Modern Encyclopedia (Klaas van Dokkum) - Part 3

Tham khảo sách 'ship knowledge: a modern encyclopedia (klaas van dokkum) - part 3', kỹ thuật - công nghệ, kiến trúc - xây dựng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | maximum range side view Revolving crane of the low type with hydraulic topping cylinders 4. The revolving crane of the low type Hook rota 11 I 1. Jib 2. Crane house 3. Runner 4. Topping cylinder 5. Crane cabin 6. Hoisting winch 7. Hook block 8. Cam disc 9. Outlet air-cooler 10. Floodlight 11. Fulcrum of the jib 12. Crane foundation 13. Hook rotator A crane of the low type In cranes of the conventional type the crane houses are 8-15 metres above the slewing bearing. However in cranes of the low type this distance is approximately 5 metres. The crane cabin extends only just above the fulcrum of the forked jib which fuses into one box-beam jib further away from the crane. The drum of the hoisting winch which also serves as a pulley is placed on top of the crane house. The lifting capacity of these cranes can vary between 10 and 150 tons the range between 12 to 35 metres. The crane s construction The figures above show one of many versions of the low type cranes. A peculiarity of this crane is that the horizontal position is merely used to park the crane in the boom cradle More containers fit beneath the jib without obscuring the view Ship Knowledge a modern encyclopedia the boom rest. When operating the crane should remain topped at least 15 . as indicated by the minimum and maximum range. All revolving cranes give the load a certain freedom of rotation. The runner itself however also has the tendency to entwine when being loaded or unloaded. For this reason the hook is always connected to the runner via a swivel bearing allowing the two parts to rotate independently. When a double cargo runner is used the hook block must not rotate relative to the crane jib because this will cause the two parts of the runner to get entangled. An electric-hydraulic hook rotator is used to prevent this and to prevent undesired rotation of the load. Somewhere on the crane jib there is a cable reel that slacks and hoists the power cable via a number of guide sheaves ensuring that it

• Kiến trúc - Xây dựng
• shipwise
• building of ship
• various sections
• closing arrangements
• engine room
• electrial installations