| 摘要 |
PURPOSE:To obtain seal in simple ways by installing a circular valve plate onto a hopper and installing a swing pipe onto the valve plate, thus suppressing the substantial change of shape of the circular valve plate, when the swing pipe is swung to switch the discharge port of the hopper. CONSTITUTION:The penetration cylinders 4 of two press-feeding apparatuses 3 are advanced and retreated into hopper 2 alternately, and ready mixed concrete is supplied under pressure from the discharge ports alternately. In this case, a swing pipe 19 is adjusted alternately to the discharge port 9 in press- feeding operation by a switching apparatus 21, and the other discharge port 9 is closed by a valve plate 18. Since, in this case, the valve plate 18 is formed into circular form, the valve plate 18 shifts the revolution position only, even if the swing pipe 19 is swung, and ready mixed concrete, etc. intrudes into between an installation seat 15 and the valve plate 18 from the discharge port 9, and leak of the concrete outside from the gap is prevented.
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