Hydraulic fault protection based hydraulic device for downwards pressing sector section and application method thereof

The invention relates to the field of accessory equipment for performing after-treatment or post-processing for casting billets in fields, and specifically relates to a hydraulic fault protection based hydraulic device for downwards pressing a sector section and an application method thereof. The device comprises an oil tank (11) and a downward pressing oil cylinder (12). The device is characterized by further comprising an accident energy storage set (1), pressure relays (2), first throttling holes (3), proportional pressure reducing valves (4), first electromagnetic directional valves (5), second electromagnetic directional valves (6), third electromagnetic directional valves (7), second throttling holes (8) and hydraulic locks (9). The device has the characteristic of performing protection during normal operation and fault occurring. According to the device, fault points can be accurately positioned, and the automation degree and the intelligence degree are high, so that the protection efficiency can be improved, and the safety and reliability can be ensured.