Designing and manufacturing overhead crane

1
Designing and manufacturing overhead crane

• Omar Jaafar Hassan 199900307
• Humaid AL-Marzoqi 200000181
• Khalid AL-Hasani 199900342
• Zayed AL-Katheeri 199900295
• Advisor
• Prof. Kamal A.F.Moustafa

2
Crane Mechanism
3
Materials Handling

• 1) Picking up the load
• 2) Transporting the load
• 3) Setting the load down

4
Importance of cranes

• 1.Avoid Congestion, Delays and unnecessary
  handling.2. Improve production operations .
• 3. Lower unit Materials handling Cost

5
Importance of cranes cont.

• 4. Reduce damage due to Materials handling.
• 5. Maximize space utilization.
• 6. Reduce the accident rate and severity of
  injury.

6
Type of cranes

• Mobile cranes
• Stationary cranes

7
Mobile cranes

• Mounted Cranes
• Crawler-Mounted Cranes

8
Mounted Cranes
A wheel-mounted crane is mobile and flexible
crane that can be driven on or off roads over
rough terrain. Advantage small working area.
9
Crawler-Mounted Cranes
Stable base. The advantage continuous work in
remote areas
10
Stationary cranes

• Bridge Cranes
• Jib Cranes
• Gantry cranes
• Tower Cranes

11
Bridge Cranes

• The most important part are girders, trucks, end
  ties, walkway and a drive mechanism

12
Jib Cranes

• Jib cranes consist of a horizontally mounted
  beam, not unlike a monorail, but that can swing
  in a semi-circle.

13
Gantry cranes

• Bridge crane but with girders that used in free
  space.

14
Tower Cranes

• Construction crew uses the tower crane to lift
  steel, concrete, large tools.

15
Main Components of Overhead Crane

• Girder
• Trolley
• Hoist
• Runway Rail

16
(No Transcript)
17
Safety

• Safety instruction
• Steps to inspect the crane safety
• Maintenance of the overhead crane

18
Safety Instructions

• Loads should not be suspended over personnel
  below.
• Avoid rapid movements in any direction

19
Safety Instructions

• Do not exceed the rated load capacity of the
  crane, hoist, chain, cable, slings, or other
  component.

20
Steps to inspect the crane safety

• Daily inspection
• Periodic inspection

21
Daily inspection

• Hoisting and lowering
• Trolley travel
• Bridge travel

22
Periodic Inspections

• Deformed, cracked or corroded members
• Loose bolts or rivets
• Cracked or distorted parts such as bearings,
  gears, rollers, etc
• Excessive wear on brake system parts

23
Maintenance Requirements

• A preventive maintenance program based on the
  crane manufacturers recommendations must be
  implemented.
• Only specialist engineer may perform the required
  maintenance and repairs.

24
Procedure of designing
25
Designing Techniques

• Newtons Second Law approach
• Lagranges approach

26
Newtons Second Law approach

• Assumptions
• Cable is mass less
• The payload is lumped with the hook and
• modeled as a sphere
• The system is frictionless

27
Newtons Second Law approach cont. Free body
diagram of the system
28
Newtons Second Law approach cont. Trolley
kinetic
29
Newtons Second Law approach cont. Payload
kinetics
Force balance in the horizontal direction
30
Newtons Second Law approach cont. Payload
kinetics
Force balance in the vertical direction
31
Lagranges Approach
32
Lagranges Approach Cont.
Kinetic energy expression
Potential energy expression
33
Lagranges Approach Cont.
34
State Variable Form
35
State Space Form
36
MAT-LAB Representation
37
Force Behavior
38
Displacement Behavior
39
Velocity Behavior
40
Swing Behavior