Intermittent foam pre-foaming machine

Abstract

The invention relates to an intermittent foam pre-foaming machine. A vacuum barrel body is provided with an exhaust pipe, a vacuumizing pipe and a feeding port; a lower end barrel opening of the vacuum barrel body is provided with an end cover which is internally provided with a steam cavity chamber; a steam partition plate is arranged above the steam cavity chamber; communicating holes are formed in the plate face of the steam partition plate; a supporting pipe is arranged at the center of the end cover, and threaded connection match is formed; a gear is arranged on the outer wall of the end cover; the gear on the outer wall of the end cover is engaged with a driving gear; the end cover moves in the vertical direction and is matched with the lower end barrel opening of the vacuum barrel body; a driving rod is rotationally arranged in the supporting pipe; the lower end of the driving rod is connected with a driving mechanism; the upper end of the driving rod is fixedly connected with the lower plate face of the steam partition plate; and the pre-foaming machine can increase the expansion speed of expendadble resin bead particles, a power mechanism is utilized to drive the driving gear to rotate, and therefore the end cover can be separated from the lower barrel opening of the vacuum barrel body, and accordingly automatic discharging is achieved.

Description

technical field [0001] The invention relates to the technical field of foam processing, in particular to an intermittent foam pre-expansion machine. Background technique [0002] In the process of foam production, the original expandable resin beads should be pre-expanded to obtain the required specific gravity. After pre-expanding, the beads should retain as much foaming agent content as possible, so that they can fully expand in the next foam molding process to obtain a smooth white foam mold; foams for packaging mostly use steam continuous pre-expansion machines, continuous pre-expansion machines The productivity is high, but the specific gravity is difficult to control. The intermittent pre-expanding machine can accurately control the specific gravity of the pre-expanded thick beads through the height of the material level, and is suitable for the pre-expanded use of foam beads for lost foam that require high specific gravity. The intermittent pre-expansion machine is ...

AI Technical Summary

Problems solved by technology

In the vertical pre-expansion machine, the material level rises during the pre-expansion process, and the cross-sectional area of ​​the cylinder remains unchanged. It is easy to use the high material level to control the pre-expansion specific gravity, but the steam pre-expansion machine also needs a further air-drying device for air-drying foam beads. For example, boiling drying bed; horizontal pre-expansion machine, the cross-sectional area of ​​the cylinder is always changing when the material level rises, it is difficult to accurately control the material level, and the vacuum pre-expansion machine heats the cylinder wall through the interlayer, The heat is transferred to the constantly tumbling beads, and at the same time, the multi-barrel is vacuumed, and the foaming agent inside the beads promotes the expansion of the beads under the action of the internal and external pressure difference. Although the vacuum pre-expansion machine can obtain dry beads, the heating efficiency Low, slow pre-expansion speed, and after the beads in the vacuum pre-expansion machine expand, it is extremely inconvenient to unload

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