QB belongs to bridge explosion-proof crane, and LHB belongs to double-beam crane explosion-proof crane. They are not inclusive, but different types of explosion-proof crane, which are selected according to different working conditions and working levels. A brief introduction is as follows:

I. * * * Similarities:

1, with the same explosion-proof classification, such as EXdIIBT4 and EXDIICT 4；;

2. The principle and method of explosion protection are the same;

3. The main beams are all double beams.

Second, the difference:

1, different models: QB is a standard explosion-proof car, LHB is an explosion-proof hoist car;

2. The driving device of the cart is different: the QB corner box wheel is driven greatly, equipped with explosion-proof motor, reducer and brake; LHB is generally equipped with an integrated explosion-proof drive device with small transmission;

3. Different operation modes: QB must be operated empty, and ground or remote operation is not allowed, while LHB can be operated empty, ground or remote;

4, different mounting quality: QB is generally 5-200 tons, or even heavier, LHB is generally not more than 32 tons (European explosion-proof gourd can hit about 80 tons);

5. Different work intensity: QB is more suitable for continuous work and high-intensity work, while LHB is suitable for light, small and short-time work;

6. Others are different from self-respect, price, service life, handling and stability.