① The Mine Car contact is damaged or missing, the contact spring is damaged, and the bolt is broken or loose.
②The deformation of the chassis of the mine car is out of limits, the bottom beam is cracked or the riveting fastener is loose.
③The Mine Car wheel axle is bent and deformed, and the wheel set swings beyond the limit or does not rotate.
④The cracks, damage or deformation of the mine car box are out of limits.
⑤ The Mine Car connector is worn out or broken, and the anti-off device is damaged.
⑥ Parts such as Mine Car connecting bolts and pins are damaged or missing.
