Spray gun, equipment and system for joint coating in pipeline

The utility model provides a pipeline inner joint coating spray gun, equipment and a system, and the pipeline inner joint coating spray gun comprises a powder inlet pipe, a powder distributing container and a spray head assembly. The powder inlet pipe can rotate around the axis of the powder inlet pipe. The powder distributing container is arranged at the outlet end of the powder inlet pipe and is communicated with the powder inlet pipe; the spray head assembly comprises a spray head and an arc-shaped hose; the spray head is arranged on one side of the powder distributing container and communicated with the powder distributing container through the arc-shaped hose, and the powder outlet direction of the spray head is perpendicular to the axis of the powder inlet pipe. According to the scheme, anti-corrosion treatment of the circumferential weld in the conveying pipeline can be achieved, and the leakage risk of the conveying pipeline is reduced. 本申请提供一种管道内补口喷枪、设备及系统，其中，管道内补口喷枪包括进粉管、分粉容器和喷头组件。所述进粉管可绕其轴线转动；所述分粉容