electric double girder overhead crane lifting capacity: from 5t to 400t span: 5.5m to 34.5m lifting height: 3m to 30m working duty: A3, A4, A5,A6,A7 According the working condition and its different lifting device, double girder overhead crane mainly has following type: 1. double girder overhead crane with hook including QD type and LH type     QD type double girder overhead crane: its lifting device is hook. and its hoisting trolley is winch structure.     LH type double girder overhead crane: its lifting device is also hook, its hoist trolley is electric hoist. 2. double girder overhead crane with grab (QZ type)     QZ type double girder overhead crane: its lifting device is grab. 3. explosion-proof double girder overhead crane (QB type)     QB type explosion-proof double girder overhead crane is used in  hazardous environment, such as explosive gas condition, for example oil plant, gas station, mine. 4. double girder overhead crane (QDY type)       QDY type double girder overhead crane is specially used in high temperature working condition such as steel plant, it is used for handling hot steel plate, etc. 5. double girder overhead crane (YZ type)      this YZ type double girder overhead crane is higher level crane used in steel plant and foundry for hanlding liquid metal and hot metal. 6. double girder overhead crane with electric magnet (QC type)     QC type double girder overhead crane: its lifting device is electric magnet. 7. double girder overhead crane with two trolley (QE type)     QE type double girder overhead crane have two independent trolleys. 8. other specially used crane for industy. 

After-sales Service promises:

 Ⅰ. Quality problems of products sold by our company will be solvedas per the"Three Guarantees"system of our company by the "Three Guarantees"service team;

Ⅱ.Related personnel will be sent to the site immediately after receiving quality complaints(by call,letter or oral notice)from clients;

Ⅲ.Personnel involved in after-sales service shall be serious and considerate in handing the problem to make clients crane-free;

Ⅳ.In addition to solve quality problems,personnel involved in after-sales service shall train clients,answer their technical inquiries and related questions free of charge.

Ⅴ.Related cost for products with quality problem will be shouldered by our company.Our company charges for quality problems caused by clients (or problems after the warranty term ),but the charge will not be higher than the expense(or cast);

Ⅵ.Establish the client-orient concept to offer timely,serious,sonsiderate and complete service,and value the image of the all the time to serve the company and clients.