EOT-Crane.pptx is about the mechanical maintenance of crane

EOT crane parts & working principle

1. EOT CRANE OPERATING AND SAFETY MECHANICAL MAINTENANCE

2. Full form of EOT Cranes ?

3. E-Electrical O-Over head T-Travelling Cranes

4. Full form of SWL?

5. SAFE Working Load Like EOT Crane SWL 5T Means capacity of EOT crane is not more than 5 Ton.

6. EOT CRANE PARTS

7. Single girder EOT CRANE

8. Double girder EOT CRANE

9. Difference

10. EOT Crane Working Principle

11. EOT Crane Working Principle system consists of three working movements: 1.crane hook up and down lifting. 2. Cross Trolley movement. 3. Crane long traveling longitudinal motion.

12. MAIN HOIST motor Thruster brake Gear box Drum

13. 1.Transmission of Power in hoisting system: The driving force of hoisting mechanism is from motor. It transmits power by gear coupling, and brake-wheel coupling. Then through Gear Box to reduce the high revolution of motor to the required revolution, and output by low-speed shaft of Gear box. The ring gear of drum transmit driving force to drum set, then through wire ropes and pulleys drive crane hook up and down, so as to finish the lifting of the heavy objects up and down. 

14. CROSS TRAVEL Motor Thruster brake Coupling Gear Box

15. Transmission of crane Trolley traveling system: 1.the driving force of crane trolley is from motor. It transmits power by brake-wheel coupling and half gear coupling. Then through Gear Box to reduce the high revolution of motor to the required revolution, and output by low-speed shaft of reducer. And then by gear coupling, the gear coupling joint with trolley driving wheels, so as to drive the trolley driving wheels rotating, so that finish trolley transport heavy objects by lateral movement.

16. crane long traveling longitudinal motion

17. 1.the driving force of crane trolley is from motor. It transmits power to the high speed shaft end of reducer by brake-wheel coupling, compensation shaft and half gear coupling. Then through reducer to reduce the high revolution of motor to the required revolution, and output by low-speed shaft of reducer. And then by full gear coupling joint with crane driving wheel shaft, so as to drive the crane driving wheels rotating, so that finish bridge transport heavy objects by lateral movement.

18. Working Load Limits (WLLs) of Attachments Below are the rule of thumb methods of calculating the WLL’s of flexible steel wire rope, chain and fiber rope. Please note that these methods only give approximate answers. 1. Flexible steel wire rope (FSWR) Formula: WLL ( kgs ) = D ² (mm) x 8 For example: Rope diameter (D) = 12mm WLL ( kgs ) = D ² (mm) x 8 = D (mm) x D (mm) x 8 = 12 x 12 x 8 = 1152 kgs WLL (t) = 1.15 tonnes

19. QUESTION ? Calculate the diameter (D) in mm of FSWR needed to lift load of 3 ton.

20. Answer Formula WLL ( Kgs )= D ² X 8 Here WLL=3000 Kgs D ² = 3000/8 D ² = 375 D = 19.3 mm

21. 2. For Chain The WLL of chain is determined by the grade (G). Formula: WLL ( kgs ) = D ² (mm) x G x 0.3 For example: Chain diameter – 10mm, Chain grade (T) i.e. grade 80.

22. 2. Chain The WLL of chain is determined by the grade (G). Formula: WLL ( kgs ) = D ² (mm) x G x 0.3 For example: Chain diameter – 10mm, Chain grade (T) i.e. grade 80 .

23. WLL = D ² (mm) x G x 0.3 WLL = 10 x 10 x 80 x 0.3 WLL= 2400 kgs WLL (t) = 2.4 tonnes . Grade 80 super alloy load chain is commonly used and heat-treated for long life. The safety factor is more than 6-1. Load chain is zinc plated for resistance against corrosion. 3. Fiber Rope Formula: WLL ( kgs ) = D ² (mm) For example: Diameter = 25mm WLL ( kgs ) = D ² (mm) WLL ( kgs ) = D (mm) x D (mm) = 25 x 25 = 625 kgs WLL (t) = 0.625 tonnes .

24. 3. Fiber Rope Formula: WLL ( kgs ) = D ² (mm) For example: Diameter = 25mm WLL ( kgs ) = D ² (mm) WLL ( kgs ) = 25 x 25 = 625 kgs WLL (T) = 0.625 tonnes .

25. Cross travel assembly. Position of Traversing limit switch.

26. Applications of EOT Cranes are vast.They are used in Many Industries. Ceramic Industries Power Plant Transport Industry Construction Industry Petrochemical Industry Chemical Industries Steel Plant Dairy Industries Foundries Textile Industry Cement Industry In Assembly Line Paper and Packing Petro-Chemical Shipbuilding Fertilizers Manufacturing

27. EOT CRANE CONTROLLING EQUIPMENTS 1.MASTER CONTROLLER. 2.ELECTRICAL THRUSTER BRAKE. 3.DC AND AC ELECTROMAGNETIC BRAKES. 4.LEVER LIMIT SWITCH. 5.ROTARY LIMIT SWITCH.

28. 1. Master controller for EOT crane Reversed Forward

29. Master Controllers are used for remote operation of Contactors in equipment such as E.O.T. Cranes Cam

30. Spring return arrangement & Dead man’s handle arrangement are also available.

31. Thruster brake is a device to retard the speed of rotating drum and to stop accurately in desired position. Working: When thruster is not energies then Brakes are in applied condition. When Thruster is energies brakes are released through compression spring and drum starts rotating. ELECTRICAL THRUSTER BRAKE Brake shoes Thruster Compression spring

32. Works for 220 V DC supply. DC Electro Magnetic Brakes

33. AC electromagnetic brakes suitable for single phase up to 440 V AC supply

34. These limit switches are used for controlling over travel of linear motion. Lever limit switch

35. GRLS are used for trip supply when moving loads are reaching to extreme limit of working zone. Mostly used in hoists. Geared rotary limit switch

36. Thank you