Blockage dredging device for downcomer of gas drainer

The utility model relates to the technical field of gas drainers, and discloses a gas drainer downcomer blockage dredging device which comprises a gas pipeline, the left end of the gas pipeline is fixedly communicated with a drainage pipe, the right end of the outer end of the drainage pipe is fixedly provided with a drainage primary valve, and the left end of the outer end of the drainage pipe is fixedly provided with a drainage secondary valve. A gas drainer body is fixedly installed at the left end of the drainage pipe and fixedly communicated with the drainage pipe, a first after-valve sampling valve is arranged on the right side of the front side of the drainage pipe, and a first before-valve sampling pipe is fixedly communicated with the right end of the front end of the drainage pipe. According to the blockage dredging device for the downcomer of the coal gas drainer, if the drainage pipe of the coal gas drainer is blocked, a worker does not need to stop a coal gas pipeline and related coal gas equipme