Self-cleaning device for hardened cement discharging pipe

The utility model provides a hardened cement discharging pipe self-cleaning device which comprises a cement discharging pipe and further comprises a self-cleaning mechanism arranged on the inner wall of the cement discharging pipe and a driving mechanism used for driving the self-cleaning mechanism to work. The self-cleaning mechanism comprises at least three groups of scrapers which are sequentially arranged on the periphery of the inner wall of the cement discharging pipe from top to bottom, and the driving mechanism drives the scrapers to do up-and-down reciprocating motion on the inner wall of the cement discharging pipe so as to perform self-cleaning on cement board joints. According to the cement discharging pipe, cement board joints on all parts of the inner wall of the cement discharging pipe can be automatically cleaned, the accident that the cement board joints block the cement discharging opening is avoided, and smooth filling work is guaranteed; meanwhile, cement with the preset mass can completel