Full-automatic-control under-pressure self-cleaning sampler suitable for hydrogenation process

The utility model discloses a full-automatic control under-pressure self-cleaning sampler suitable for a hydrogenation process, which comprises a hydrogen inlet pipeline extending into a hydrogenation kettle, and is characterized in that a sampler is arranged in the hydrogen inlet pipeline, a first pneumatic stop valve is arranged between the sampler and the hydrogenation kettle, and a second pneumatic stop valve is arranged between the sampler and the hydrogenation kettle. The sampler is divided into three paths towards the hydrogen input end, one path is connected to a hydrogen inlet through a second pneumatic stop valve and a second regulating valve, the other path is connected to a nitrogen inlet through a first regulating valve, and the third path is connected to a hydrogen emptying pipe network through a third pneumatic stop valve and a check valve; and the sampler is connected with the sampling port through a fourth pneumatic stop valve and a hand valve. Equipment is small and exquisite, the manufactur