Screen exchanging device

Details Screen exchanging device Screen exchanging device

1999-12-01

2001-07-17

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

C425S199000, C210S484000, C210S485000, C210S497300

Reexamination Certificate

active

06261079

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of Invention
This invention relates to a screen exchanging device in a plasticizing apparatus to be used in an extrusion molding machine, an injection molding machine, etc.
2. Related Art
One example of a screen exchanging device in the conventional extrusion molding machine will be explained hereunder.
As shown in
FIG. 6
, the screen exchanging device of the conventional type includes a housing
100
having a through hole
102
, a blind flange
106
detachably provided at one end of the housing
100
, a slide bar
105
slidably inserted in the through hole
102
in an axial direction from the other end of the housing
100
. In a filter chamber
107
formed between a distal end face of the slide bar
105
and the blind flange
106
, is arranged filter means
108
which will be described below. On opposite side walls of the housing
100
, are respectively formed an inlet
103
and an outlet
104
which communicate with each other.
The filter means
108
consists of a container plate
109
in a form of a perforated plate and fixed to the distal end of the slide bar
105
, and a plurality of cylindrical screen pack cartridges
108
a
detachably attached to the container plate
109
at a face thereof opposite to the slide bar side. The screen pack cartridge
108
a
is composed of a cylindrical breaker plate and a screen net which covers an outer peripheral wall thereof.
In this screen exchanging device, a molten resin flowing from the inlet
103
into the filter chamber
107
is filtered through a plurality of the screen pack cartridges
108
a
to remove foreign objects, and then flows through the perforated container plate
109
to be discharged from the outlet
104
. When the foreign objects are accumulated and a loss in pressure has exceeded the determined value, the screen pack cartridges
108
a
will be exchanged. On this occasion, after removing the blind flange
106
of the housing
100
, a hydraulic cylinder
111
is actuated to project its rod
111
a
in order to push the slide bar
105
, thereby to cause the distal end of the slide bar
105
to project from the one end of the housing
100
, thus allowing the screen pack cartridges
108
a
to be exchanged with new ones (JP-A-7-299310).
According to the above described conventional art, because the cylindrical screen pack cartridges are arranged on one face of the container plate, only a limited number of the screen pack cartridges can be arranged, and when exchanging the screen, it takes a lot of time and efforts to attach and detach the screen pack cartridges to and from the container plate. Moreover, since the filtered foreign objects are accumulated in the filter chamber, there has been an additional problem that the foreign objects accumulated in the filter chamber must be removed at the same time.
SUMMARY OF INVENTION
The present invention has been made in view of the above described problems that the prior art has encountered, and its object is to realize a screen exchanging device which can eliminate annoying works in exchanging the screen and is free from a fear that the foreign objects may be accumulated in the filter chamber.
In order to achieve the above described object, the screen exchanging device according to the present invention comprises a housing having a through hole, a slide bar axially slidably inserted in the through hole, a cylindrical filter chamber formed in a distal end of the slide bar, and an inlet and an outlet provided in opposite side walls of the housing respectively, said screen exchanging device being so constructed that a molten resin which has entered through the inlet is filtered in the filter chamber and flows out through the outlet, characterized in that the filter chamber includes a communicating hole communicating with the outlet and a concave formed at an outer peripheral face thereof except an area adjacent to the communicating hole, the concave being provided with a plurality of fitting holes extending from the outer peripheral face toward an axis core of the filter chamber, and spaced in circumferential and axial directions with respect to one another, into each of the fitting holes being detachably fitted a screen cartridge which consists of a breaker plate of a perforated plate in a form of a bottomed conical tube and a net member in a form of a bottomed conical tube inserted into the breaker plate.
Moreover, the net member inserted into the breaker plate can be so constructed that it can be attached and detached to and from the breaker plate.


REFERENCES:
patent: 2763374 (1956-09-01), Corbett et al.
patent: 4332541 (1982-06-01), Anders
patent: 4361489 (1982-11-01), Kilsdonk et al.
patent: 4453905 (1984-06-01), Bennett
patent: 5125823 (1992-06-01), Kreyenborg
patent: 5151025 (1992-09-01), Muller
patent: 5449458 (1995-09-01), Gneuss
patent: 29 47 698 (1981-06-01), None
patent: 7-299310 (1995-11-01), None
Patent Abstracts of Japan vol. 009, No. 162 (M-394), Jul. 6, 1985 & JP 60 036122 A (Nippon Seikosho KK) Feb. 25, 1985 *Abstract.

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