The envelope shall not have serious deformation, cracks, corrosion and rivets off, threaded connection loosening and so on.
Inside the car, the outside shall not have any sharp objects that can cause injury.
The compartment of the compartment should be flexible, connected and locked reliably.
Between the car between the car, the gap between the car and the floor should not be greater than 3mm.
Dumping, semi-dump truck tipping control lock to insert or extract flexible, reliable lock.
The carriage should have a front safety frame and a cable hook.