(57) [Abstract] the sprinkler pipe that is plumbed to the inside OBJECTIVE mixer is performed inside the washing by flowing pressurized water and further sprinkling pipe (2) and by rotating the cylinder (4), a ceiling, and to enable the cleaning over the details of the lateral wall. [Configuration] The use of kneading water in which the concrete is kneaded manufacture, pressure water pressurized with the pressure tank for each batch, the mixer inner washed through the pipe by the water spray pipe to the mixer, the cylinder (4) The sprinkler pipe is rotated by, and spread the cleaning area, further freely switched by the solenoid valve (14), the water spray pipe is a pipe in the concrete hopper to inject pressurized water and also to clean the concrete hopper.
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