我矿于1992年为了减少二次破碎量，出矿块度由O～SO0mm增大到l～1200mm。原来担负主要出矿运输任务的sin’底卸式矿车，在大块矿石的冲击下，加强梁弯曲，主梁开裂，车底架体强度降低；自动挂钩碰头在井下较恶劣的使用条件下，脱钩或再拖钩时困难，需要人来辅助操作。由于车箱 Mine in 1992 in order to reduce the amount of secondary crushing, ore block from O ~ SO0mm increased to l ~ 1200mm. Under the impact of large ores, the sin ’s bottom unloading car, originally responsible for the task of transporting and transporting ore, strengthened the beam bending and cracking of the main girder, and the strength of the frame body of the car was reduced. Under the harsh conditions of underground operation, , Decoupling or re-hook difficult, need people to assist in the operation. Thanks to the car