RU1794035C - Apparatus for prefoaming pellets of cellular polystyrene - Google Patents

Abstract

Usage: equipment for foaming granules of polystyrene foam. SUMMARY OF THE INVENTION: the device comprises a source material feeder, a foaming chamber connected by an aperture to an additional chamber. The outlet of the auxiliary chamber is connected to an intermediate chamber, in the lid of which is perforated to suck in cold air. In the lower part of the additional chamber there is installed a means for drying granules, made in the form of an annular tube with holes on its inner surface for air supply, located at an angle of 45 [deg.] to the vertical axis. 2 ill.

Description

The invention relates to techniques for processing plastics, in particular to devices for pre-foaming polystyrene foam, which can be used in packaging and heat and sound insulation processing lines.

The aim of the invention is to increase the reliability of the device and to improve the quality of the granules.

In FIG. 1 shows a general installation diagram; in FIG. 2 - a means of drying granules., ...

The installation comprises a foaming chamber 1, which, together with a hollow bottom 2, is attached to the frame 3. The bottom is a cylinder closed by two covers. Pipes 4 and 5 are located in the bottom cover, respectively, for supplying steam and draining condensate. In the upper cover of the hollow bottom 2 there are filter elements 6 for introducing steam and a valve for draining condensate from the foaming chamber 1 (not shown in Fig.). In the foaming chamber, on two bearings 7, a mixer 8 is mounted with blades 9 in the form of plates. The mixer 8 receives rotation from the drive 10. The source material feeder consists of a hopper 11 and a funnel 12. The granules are unloaded from the foaming chamber through an opening

. 13, an additional chamber 14 into the intermediate chamber 15 with a crusher (not shown) receiving rotation from the drive 16, and

 the foamed polystyrene is transported from the intermediate chamber 15 to the storage hopper (not shown in the drawing) through pneumatic pipelines (not indicated) by the injector 17, for which heated air serves as the working gas. The air is heated in an electric air heater 18 to 90-100 ° C. The top cover 2 has a window 19 for the passage of steam, in which the filter elements are located 6. In order to clean the top cover

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the hollow bottom 2 from the expanded polystyrene during foaming, the mixer 8 has a knife 20. The funnel 12 is located on the injector 21. The means for supplying steam and hot air consist of pipelines and control and shut-off valves, sensors and indicating devices (not shown).

A means for drying the granules is installed in the lower part of the additional chamber 14 and is made in the form of an annular tube 22 with holes 23 on its inner surface for supplying air. The holes 23 are located at an angle of 45 ° up to the vertical axis. The outlet 24 of the additional chamber 14 is connected to the intermediate chamber 15 by means of a sealed gasket 25. The cover (not indicated) of the intermediate chamber 15 is made with perforation 26 for suction of cold air.

The installation works as follows. .;, /:.,. .,. : ... .... „-.- .:: -: ../. .

Steam is supplied to the hollow bottom 2 through the nozzle 4, part of which enters the foaming chamber 1 through the window 19 and the filter element b, and the other part with the condensate is removed to drain into the nozzle 5. When the temperature in chamber 1 reaches 105-110 ° C, in which .. the foam polystyrene foaming process occurs, under the action of the blades .9 the agitators 8 of the granule move upward towards the opening 13, the passage through which they enter the additional chamber 14, overcoming the oncoming flow of hot air from the annular tube 22, and, drying, getting on the way Shelter in the intermediate chamber 15 with a crusher. The air from the network, the passage through the air heater 18 is heated and flows through pipelines with control valves to the annular tube 22, injectors 17 and 21, from the intermediate chamber 15 through the injector 17, the granules enter the receiver hopper (not shown). Loading material into the foaming chamber 1 from the hopper 11 through the dispenser

12 through the injector 21 is produced as needed. When unloading material from the intermediate chamber 15, the injector 17 creates a vacuum and causes a counterflow of cold air through the secondary chamber 14, thereby drawing hot air into the intermediate chamber 15 from the annular tube 22, which prevents the presence of perforation 26 in the lid of the intermediate chamber fifteen.

The use of the invention will increase the reliability and quality of granules due to the possibility of blowing with hot jets of air from the holes in the annular tube of the oncoming flow of pre-expanded polystyrene foam. ::

Formula for pre-chipping - nyvani polystyrene granules containing a source material feeder, a foaming chamber connected by an aperture to an additional chamber, an intermediate chamber, means for supplying steam and drying granules, unloading mechanism with pneumatic pipelines, which requires that, in order to increase the reliability of installation and quality of granules, the means for drying the granules is made in the form of an annular tube with holes for air supply located on its inner the surface spine at an angle of 45 ° to the vertical axis, and is installed in the lower part of the additional chamber, the outlet of which is connected to the intermediate chamber, and the cover

the intermediate chamber is perforated to suck in cold air.

Editor

F / g2.

Compiled by E. Martynenko

Tehred M. Morgenthal Corrector; V. Petrash