APPARATUS FOR COATING INNER SURFACE OF METAL PIPE

PURPOSE:To make it possible to automatically clean, suck and coat the inner wall of a gas pipe under an as-embedded state, by sending a mixture of sand and a paint to a rotation energizing mechanism receiving compressed air sent in a temp. adjusted state and attached to one end of a gas pipe. CONSTITUTION:Compressed air is introduced into the air rotary apparatus 15 of a rotation energizing mechanism 10 from an air temp. adjusting apparatus 88 through a main pipe 36 and branch pipes 37-40 by the start of an air generating apparatus 69 and rotary force is imparted to compressed air to send the same to a gas pipe 13. In the next step, when sand in a sand conditioning apparatus 24 is pneumatically supplied to the mechanism 10 through a pipe 16 by the operation of a valve, it receives rotary force to be advanced along the wall surface of the pipe 13 while collided with the inner wall thereof and rust on the inner wall of the pipe 13 is removed. The fallen substance in the pipe 13 is sucked by a dust collecting apparatus 83 to clean the pipe 13. In the next step, for example, the epoxy resin paint as a main agent and a curing agent in a paint storage apparatus 58 are sent to a mixing chamber 41 through a flexible pipe 42 by valve manipulation while mixed by compressed air to be sent to the mechanism 10 through a pipe 17. This paint mixture is advanced through the pipe 13 similarily as mentioned above and the inner wall 13 is uniformly coated.