Continuous mixing plant

A continuous mixing plant comprising:

• a main belt conveyor unit for delivering aggregate;
• a continuous aggregate feeding means for keeping on feeding at least one kind of aggregate to said main belt conveyor unit while metering the material;
• a first detecting unit installed downstream of a delivery belt of said main belt conveyor unit for metering continuously at a predetermined position a local amount of said aggregate that has been transferred on said delivery belt of said main belt conveyor unit, thereby outputting a signal;
• a continuous fixed amount supply means installed downstream of said main belt conveyor unit having said aggregate fed for keeping on feeding a fixed amount of mortar or cement paste continuously to said main belt conveyor unit;
• and
• at least one mixing box unit disposed just below a delivery end of said main belt conveyor unit, characterized in that
• said continuous fixed amount supply unit receives said signal continuously output from said first detecting unit and is feedback-controlled to enhance precision of the supply amount of the mortar or cement paste, and that,
• furthermore, said mixing box unit is provided with:
• a plurality of modified passages each of which has an inlet portion at one end and an outlet portion at the other end, a cross-sectional shape of which is continuously changed from said inlet portion toward said outlet portion, and which extend in an axial direction;
• and a merging and dividing means provided between said inlet portion and said outlet portion of each of said modified passages for merging and dividing concrete passing through each of said modified passages, and concrete is cast from said inlet portion and passed toward said outlet portion through each of said modified passages by the gravitational force to be mixed.