JPH0788872A - Foam molding raw material filling machine - Google Patents

Abstract

PURPOSE:To provide the title filling machine constituted so as not generate the clogging of the gap between a piston and the inner wall of a raw material supply pipe with a raw material at the time of the retreat of the piston, miniaturized as a whole so as to reduce the stroke of a cylinder and capable of efficiently filling a foaming mold with the raw material. CONSTITUTION:In a foam molding raw material filling machine wherein the piston 4 for opening and closing the opening part 2 for filling a mold with a pre-foamed granular raw material by the operation of a cylinder is provided to the rear of a raw material supply pipe 1 having the opening part 2 provided to the leading end thereof, an air passage 11 for injecting air for supplying the raw material to the opening part 2 from the front of the piston 4 in the back position and an air nozzle pipe 15 injecting air into the gap S between the piston 4 and the raw material supply pipe 1 from the rear of the piston 4 to prevent the clogging of the gas S with the raw material are provided in the raw material supply pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam molding raw material filling machine capable of efficiently filling a pre-expanded particle raw material into a mold.

[0002]

2. Description of the Related Art Conventionally, in an expanded synthetic resin molding machine using a pre-expanded particle material such as expanded polystyrene products,
A foam molding raw material filling machine provided with a piston for opening and closing the opening by a cylinder operation at the rear of a raw material supply pipe having an opening formed at the tip for filling a pre-expanded particle raw material in a mold for foam molding. It is generally used (for example, see Japanese Utility Model Publication No. 4-3786).

Recently, a piston having a retracted position which is located in the middle of the front portion of the raw material supply pipe instead of the rear end portion of the conventional raw material supply pipe has been shortened and the cylinder has been downsized. However, in the case of such a filling machine, since the pre-expanded particulate material is supplied toward the opening while the piston is stopped in the middle of the material supply pipe, the gap between the piston and the material supply pipe is sharp. However, there is a problem in that the raw material is clogged in this gap portion, called a bridge, and the raw material cannot be efficiently supplied.

[0004]

The problem to be solved by the present invention is to solve the above-mentioned conventional problems, and when the piston is retracted, a gap is formed between the piston and the inner wall of the raw material supply pipe. Completed for the purpose of providing a foam molding raw material filling machine that can fill the raw material efficiently into the mold for foam molding while making it a small device with a small cylinder stroke to prevent the material from clogging. It was done.

[0005]

The raw material filling machine of the present invention made to solve the above-mentioned problems is a raw material having an opening at the tip for filling a pre-expanded particle raw material into a mold for foam molding. In a foam molding raw material filling machine provided with a piston for opening and closing the opening by the operation of a cylinder at the rear of the supply pipe, for feeding the raw material from the front position of the retracted piston to the opening inside the raw material supply pipe. And an air nozzle tube for ejecting air from a rear position of the piston toward a gap between the piston and the raw material supply pipe to prevent the raw material from clogging the gap. It is a thing.

[0006]

The present invention will now be described in detail with reference to the illustrated embodiments. FIG. 1 shows a first embodiment of the present invention.
Reference numeral 1 denotes a raw material supply pipe in which an opening 2 for filling the raw material having a reduced diameter in the mold is formed at the tip, and 3 is connected to the rear of the raw material supply pipe 1 coaxially to open and close the opening 2. Piston 4
Cylinder with a relatively small stroke for operating
Reference numeral 5 is a piston rod, and 6 is a cylinder head. Further, the cylinder 3 is connected to a piston advancing air supply hole 7a for advancing and retreating the piston 4 and a piston retreating air supply hole 7b.

In the embodiment, a raw material flow passage 8 parallel to the axial direction is provided on the outer peripheral portion of the cylinder 3, and the rear end portion of the raw material flow passage 8 communicates with the raw material supply port 9. The cylinder 3 and the raw material flow passage 8 are formed in an integrally formed member 10 formed by, for example, a precision extrusion molding method or a pultrusion molding method using an aluminum alloy block as a base material. By using the integrally molded member 10 having a different structure, the assembling work can be facilitated and the manufacturing cost can be reduced.

On the other hand, inside the raw material supply pipe 1, there is provided an air passage 11 for ejecting raw material feeding air from the front position of the retracted piston 4 toward the opening 2 when the piston 4 is retracted. ing. This air passage 11 is shown in FIG.
In the first embodiment shown in FIG. 1, the air supplied from the raw material supply air supply hole 13 is formed between the inner and outer double cylinders 12a and 12b constituting the raw material supply pipe 1, and the inner cylinder 12a is supplied with the air.
It is configured to be ejected toward the opening 2 from the ejection small hole 14 provided at the tip connecting portion of the piston 4 and
From the rear position of the gap S between the piston 4 and the raw material supply pipe 1
There is provided an air nozzle tube 15 for preventing air from being clogged with the material by ejecting air toward

In the air nozzle pipe 15, the pre-expanded particle raw material is referred to as a bridge in the portion of the gap S between the piston 4 and the raw material supply pipe 1 where the space space inside the raw material supply pipe 1 becomes the narrowest when the piston 4 retracts. Air is constantly ejected toward the gap S so as not to cause the above-described raw material clogging phenomenon. Further, this air source can be commonly used by being connected to the above-mentioned raw material supply air supply hole 13, and if necessary, a separate air supply source can be provided or an intermittent air supply mechanism can be provided. Of course, the design can be changed arbitrarily. Since the air nozzle tube 15 is not for supplying the air for sending the raw material into the mold but for preventing the formation of the bridge, the supply amount of the air is from the air passage 11. The structure may be such that a smaller amount of air than the required amount is supplied.

On the other hand, FIG. 2 shows a second embodiment of the present invention. The difference from the first embodiment described above is that the raw material supply pipe 1 is a double pipe as in the first embodiment. Then, since the inner diameter becomes smaller, the air passage 11 is formed by the nozzle tube 12c arranged inside the raw material supply pipe 1 so that the raw material distribution efficiency can be further improved. Since this is the only part that is common to the first embodiment, the same reference numerals are allotted in the figure and detailed description is omitted. And this nozzle tube 12c is the above-mentioned air nozzle tube 1 as shown in FIG.
5 is connected by a ring pipe 16 and is connected to the raw material supply air supply hole 13.

[0011]

With this structure, the piston 2 is moved forward and backward by the cylinder 3 to open and close the opening 2,
When the opening 2 is opened, air is ejected from the front position of the piston 4 which is retracted toward the opening 2 through an air passage 11 for ejecting air for feeding the raw material, whereby the raw material is supplied through the raw material supply port 9. Although the raw material is sucked into the raw material supply pipe 1 through the passage 8 and the required amount of raw material is supplied from the raw material supply pipe 1 into the mold by air, similar to the conventional raw material filling machine. According to the present invention, even when the piston 4 is stopped in a state where the piston 4 is positioned in the middle of the raw material flow path inside the raw material supply pipe 1 by reducing the cylinder stroke, the piston 4 and the raw material supply pipe 1 are moved from the rear position of the piston 4. Since the air nozzle tube 15 is provided to prevent air from being clogged in the gap S by ejecting air toward the gap S between
Therefore, it is possible to reliably prevent the material clogging phenomenon that forms a bridge at the time, and as a result, it is possible to efficiently fill the mold with the required amount of the material in a short time and to exhibit excellent molding efficiency. Become.

[0012]

As is apparent from the above description, the present invention makes it possible to eject from the air nozzle pipe even if the cylinder stroke is shortened and the piston is stopped while being positioned in the middle of the raw material flow passage in the raw material supply pipe. The generated air does not cause the bridging phenomenon in which the pre-expanded particles as the raw material are clogged between the piston and the inner wall of the raw material supply pipe, so that the device can be downsized and the inside of the mold for foam molding can be achieved. The raw material can be efficiently filled. Therefore, the present invention, as a foam molding raw material filling machine that eliminates the conventional problems, has a great contribution to the industrial development.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing an air passage according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Raw material supply pipe 2 Opening 3 Cylinder 4 Piston 11 Air passage 12a Inner cylinder 12b Outer cylinder 12C Nozzle tube 15 Air nozzle tube 16 Ring tube

Claims (4)

[Claims] 1. A raw material supply pipe (1) having an opening (2) for filling a pre-expanded particle raw material into a mold for foam molding, the opening (2) being operated by a cylinder (3). (2) In a foam molding raw material filling machine provided with a piston (4) for opening and closing, a retracted piston is placed inside the raw material supply pipe (1).
An air passage (11) for ejecting air for feeding raw material from the front position of (4) to the opening (2), and the piston (4) and raw material supply pipe (1) from the rear position of the piston (4). A raw material filling machine for foam molding, which is provided with an air nozzle pipe (15) for ejecting air toward a gap (S) with the air nozzle pipe (15) to prevent the raw material from clogging the gap (S). 2. The raw material for foam molding according to claim 1, wherein the air passage (11) is formed between the inner and outer double cylinders (12a), (12b) constituting the raw material supply pipe (1). Filling machine. 3. The raw material filling machine for foam molding according to claim 1, wherein the air passage (11) is formed by a nozzle pipe (12c) arranged inside the raw material supply pipe (1). 4. The foam molding raw material filling machine according to claim 3, wherein the nozzle pipe (12c) and the air nozzle pipe (15) are connected by a ring pipe (16).