Double Girder Overhead Crane Operation Precautions

 Double Girder overhead crane introduction

Double Girder Overhead Crane with hook is the most basic type of crane machine. It is widely used at machining workshop, storage, etc. The double girder overhead crane is composed of metallic structure, trolley, electrical and movement mechanism. Some special designed Double Girder Crane is used in specialized atmosphere, such as casting workshop, smelting shop, waste yard. There are special lifting tools or material for them.
The double girder overhead crane usually has two working duty: medium and heavy. If not special function and working condition, usually medium working duty is enough for ordinary work.

European style double girder overhead crane

Before Operation:

• To inspect brake, hook, rope and safety device and other parts of the double girder overhead crane, make sure all parts are in right condition and place.
• Before turning on power switch, the overhead crane operator must ensure there is no body on walking plate and rail. Once circuit interrupter is locked and there is warning board, operator should stop to start crane and ask related person to check.
• No load test: Rotate brake wheels of all mechanisms to make drum shaft or wheels spin for one circle, no block phenomena is allowed. Then turn on power, try to start the overhead crane without loading.
• Static load test: It is carried out to test the load-bearing capacity of all parts and metal structure of the double girder overhead crane;
• Dynamic load test of overhead crane: test lifting up and dropping down with rated capacity for several times. And make trolley to travel for 3-5 times, finally stop in middle of span, to check brakes, limiter, electric control and all mechanisms.
• Test and inspect all electric components.

During working:

1． When the double girder overhead crane is used at first time, it must be inspected after lifting 0.5m high, worker should check brake performance, make sure it is reliable, then start work regularly.
2. Alarm should be run with following condition:

• Lifting and dropping, crane and trolley are traveling.
• If crane run far away, being difficult to see, the alarm must ring all the time.
• When one crane travel close to another crane on same rail.
• When lifting object is near to somebody.

3． During operation, all the instruction signal must be unified regulations.
4． If power is cut off suddenly during operation, all control buttons should be set back to Zero. Before re-start crane, inspect all parts in good condition.
5． If you want to change crane / trolley traveling direction when it is traveling well, you must set back to Zero first, then start another direction.
6．If one overhead crane has two hooks, when two hooks are replaced to use, or both lifting height is close, you should operate one hook to avoid two hooks collide.
7．If one crane has two hooks, we don’t allow two hooks to lift two objects at same time. When not work, adjust lifting brake.
8． Don’t allow to stop crane by limiter on limit position. When crane is loading, we can’t adjust lifting brake.
9．Don’t lift once following ten conditions:

• Command signal is unclear or disorderly command
• Overloading
• Lifting tools is not suitable, hanging is not fastness
• On lifting object, there is person or other thing not fastened.
• Any brake can’t work
• Object is being machined
• Hanging is slanting
• Explosive objects
• Buried objects
• Object has angular, block.

10. During working, if any abnormal voice or movement, stop operation immediately, inspect crane.
After working:

• Make hook is on high position; crane and trolley stop on pointed place; controller set back to Zero. Take off protection swatch and power.
• Regular maintenance.
• Correct duty shifting.

Double girder overhead crane precautions to ensure your overhead crane operation safety and efficiency. Dongqi Double girder overhead crane lift you up!