| 摘要 |
PROBLEM TO BE SOLVED: To prevent rolling of a form at actuation when a cavity block is molded by a method in which a fixed amount of concrete is supplied into the female mold of the form, right and left pendulums of a pair are rotated reversely to each other at equal speed to vibrate the form, and in this state, concrete is pushed into a male mold. SOLUTION: During a period in which the vibration of a form 3 is stopped, pendulums 12 of a pair are positioned symmetrically to each other. In this way, when the form 3 is actuated, the pendulums 12 are started to rotate always from positions symmetric to each other and synchronized simultaneously from the start of rotation so that the rolling of the form 3 is prevented in advance. Accordingly, the vibration of the form 3 is limited to the vertical direction to prevent the rolling of the form 3. |
