JPS6237722Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a foam resin molding device, and aims to improve molding efficiency by making it possible to detect when the filling of the mold with raw material has ended.

In molding a foamed resin, such as styrene foam, the raw material beads are filled into a mold and then heated to foam, at the same time the foamed raw material beads are welded to each other. The mold is filled with raw materials using pneumatic pressure, and its completion is based on a time set on a timer. Therefore, many problems arise, such as a lot of time being wasted and the filling time having to be set depending on the molded product.

To explain the present invention with reference to the embodiments shown in FIGS. 1 to 5, 1 is a pair of molds for molding foamed resin, for example, foamed polystyrene, each of which has a mold plate 3 having a required shape to constitute the chiabit 2; Frame plate 5 for forming a closed heating chamber 4 on its back side
It is made up of. Each mold plate 3 is formed with a slit for discharging the air in the cavity 2 or supplying heating steam into the inside thereof, but illustration thereof is omitted.

6 is a raw material filling device; 7 is a raw material supply cylinder of the raw material filling device 6, one end of which is closed by a wall 8 and the other end is open; A small diameter portion 9 is also provided. Reference numeral 10 denotes a raw material supply port provided on the wall 8 side of the raw material filling device 6, through which raw material for foamed resin is supplied into the supply cylinder 7. Reference numeral 11 denotes an outer cylinder which is installed on the outer periphery of the supply cylinder 7 with a space between it and extends to the wall body 8 with both ends closed, and a part of the inner cavity overlaps with the small diameter part 9. It's summery. Reference numeral 12 indicates a pressurized air supply hole formed in a part of the outer cylinder 11, and 13 indicates a connection between the inside of the small diameter portion 9 of the supply cylinder 7, the inside of the outer cylinder 11, that is, the inside of the supply cylinder 7, and the pressurized air supply hole 12. This is a communication hole provided in the partition wall on the distal end side for communicating with each other. The raw material filling device 6 is attached to the mold 1 by passing the outer cylinder 11 through the frame plate 5 and attaching the open end of the supply cylinder 7 to the mold plate 3 through the same. .

Reference numeral 14 denotes a valve device provided on the surface of the outer cylinder 11 constituting the raw material filling device 6.

Reference numeral 15 denotes a valve chamber of the valve device 14, which is a recess on the surface of the raw material filling device 6 that is communicated with an air passage 20 provided in the material filling device 6 through a wall of the device 6 and communicating with the supply cylinder 7. At this point, a lid 17 is attached and formed between the device 6 and the lid 17. The lid 17 is provided with a through hole 19 communicating with the outside, and an annular valve seat 18 is formed in the valve chamber 15 with the through hole 19 located inside.

A valve plate 16 has an area that closes the annular valve seat 18, is shaped to partially close the air passage 20, and is housed in the valve chamber 15 below the valve seat 18 so as to be able to freely move up and down. .

Reference numeral 21 denotes an actuating device that operates by starting and stopping the flow of air, and this is connected to the through hole 19 of the lid 17 of the valve device 14 through a pipe 22. Reference numeral 23 designates a box for the actuating device 21, the inside of which is divided by a diaphragm 24, with a ventilation chamber 25 on one side and an operating chamber 26 on the other side.
is formed, and the piping 22 is connected to the ventilation chamber 25. 27 is a movable electric contact attached to the diaphragm 24, and 28 is a fixed contact attached to the side wall of the operating chamber 26 opposite to the movable contact 27. Normally, the diaphragm 24 is bent toward the operating chamber 26. , contacts 27 and 28 are in contact. 29 is a conductor connected to contacts 27 and 28;
The wiring is such that when contacts 7 and 28 come into contact, the supply of air to the supply hole 12 is stopped. 30 is a small diameter ventilation hole provided in the ventilation chamber 25 and the operation chamber 26.

Reference numeral 31 denotes an air cylinder attached to the end of the wall 8 of the raw material filling device 6 facing the supply cylinder 7, and the axes of the supply cylinder 7 and the air cylinder 31 are aligned with each other. 32,3
Reference numeral 3 designates intake and exhaust ports formed at both ends of the air cylinder 31 in the axial direction, and reference numeral 34 designates a piston rod that extends through the wall 8 and is disposed so as to be reciprocally movable within the supply cylinder 7 and the air cylinder 31. , a small diameter portion 9 is provided at the end on the supply cylinder 7 side.
A stopper 35 for opening and closing the open end of the supply cylinder 7 is fixed thereto, and has an outer diameter matching the inner diameter of the supply cylinder 7 and has a length spanning almost the entire length thereof.
36 is a piston fixed to the end of the piston rod 34 in the air cylinder 31, and the air cylinder 31 connects the end surface of the stopper 35 to the supply cylinder 7.
The stopper 35 is made substantially flush with the tip end surface of the stopper 35, and has a length that allows the entire length of the stopper 35 to be extracted from the small diameter portion 9 to open the mouth of the small diameter portion 9.

Molding of foamed resin, such as styrene foam, using this device involves joining the molds 1 and 1 to each other, supplying air into the air cylinder 31 from the intake and exhaust ports 33, and retracting the piston rod 34 as shown in FIG. The small diameter portion 9 of the supply cylinder 7 is opened. Then, raw material beads are supplied as a raw material from the raw material supply port 10, and pressurized air is supplied into the outer cylinder 11 from the supply hole 12. Air supplied into the outer cylinder 11 flows into the cavity 2 through the communication hole 13 through the supply cylinder 7, and is discharged through a slit formed in the template 3. For this reason, the inside of the supply cylinder 7 becomes in a negative pressure state, and the raw material therein is drawn into the cavity 2.
The feeding of this raw material is the same as in the known mold for molding foamed resin.

Air is supplied into the outer cylinder 11 from the supply hole 12,
When the inside of the supply cylinder 7 becomes a negative pressure state, the air passage 2
The air inside the valve chamber 15 is also sucked through the valve plate 16.
However, since the valve plate 16 only closes a part of the ventilation passage 20, the valve chamber 1
5. Ventilation chamber 25 of actuating device 21 via piping 22
The air inside is sucked out, and the diaphragm 24 is moved as shown by the dashed line in FIG.
is separated to continue supplying pressurized air to the supply cylinder 7. In this way, as the filling of the raw material into the chiabit 2 continues and the amount of raw material in the chiabit 2 increases, the slit formed in the template 3 is closed with the raw material, and the air in the chiabit 2 is removed. It becomes difficult to leak outside. Kiavitei 2
As it becomes difficult for air to flow out from the valve chamber 1,
5 and the like from the ventilation chamber 25, and when the entire inside of the chiabit 2 is filled with the raw material, it becomes almost impossible for air to flow out from the chiabit 2. In this case, the air sent into the outer cylinder 11 flows toward the ventilation passage 20, and its pressure presses the valve plate 16 against the annular valve seat 18, so the flow of air in the ventilation chamber 25 disappears. The diaphragm 24 is restored and the contacts 27,
Let them touch 28. A signal generated by contact between the contacts 27 and 28 causes the supply of air from the supply hole 12 to be stopped, and the filling of the raw material is completed.

After filling the raw material, heating and foaming the raw material are the same as in known apparatuses.

In the embodiment shown in FIG. 6, a pressurized air supply hole 12 is provided in the main body of the material filling device 6 without extending the outer cylinder 11 to the material filling device. The subsequent closing of the annular valve seat 18 by the valve plate 16 is exactly the same.

As mentioned above, the present invention utilizes the fact that the flow of air for filling raw materials into the chiabitay changes as the amount of raw materials charged increases, and operates the valve plate 16 with the air pressure. This detects the completion of filling of raw materials, and can accurately detect the completion of filling of raw materials. Therefore, it is possible to eliminate wasted time when filling raw materials and to set the time required for filling raw materials each time the molded product changes, thereby improving molding efficiency. Moreover, it is possible to reduce excess or deficiency in the amount of raw materials filled.

In the embodiment shown in FIG. 2, the valve plate 16 is placed only at the bottom of the valve chamber 15, but if there is a possibility that the valve plate 16 will move in any direction other than up and down, the valve plate 16 can be placed as shown in FIG. It can also be supported by a screw screwed into the bottom of the valve chamber 15. The valve device 14 may be provided at any position, and may be provided on the outer periphery of the outer cylinder 11.

As the actuating device 21, contacts 27 and 28 are used.
Although we have shown an example of a device that turns ON and OFF, it is possible to use a device with any configuration that allows you to check when the air is flowing and when it has stopped. It is also possible to use an actuating device 21 that visually confirms the position of the plate whose position is to be changed, and to stop the supply of air to the supply holes 12 after confirmation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional front view, FIG. 2 is an enlarged sectional view of the valve device, FIG. 3 is a plan view of the valve device, and FIG. 4 is an enlarged sectional view of the actuating device. FIG. 5 is an enlarged sectional view of another example of the valve device, and FIG. 6 is a sectional front view of the example without the outer cylinder. DESCRIPTION OF SYMBOLS 1... Mold, 3... Template plate, 6... Raw material filling device, 7... Supply cylinder, 9... Small diameter part, 10...
... Raw material supply port, 11 ... Outer cylinder, 12 ... Pressurized air supply hole, 13 ... Communication hole, 14 ... Valve device, 1
5... Valve chamber, 16... Valve plate, 17... Lid, 18
... Annular valve seat, 19 ... Through hole, 20 ... Ventilation path,
21... Actuation device.

Claims (1)

[Claim for Utility Model Registration] It has a supply cylinder into which the raw material is fed and a pressurized air supply hole for moving the raw material inside the mold into the mold, and the opening on the tip side of the supply cylinder is opened and closed. The raw material filling device, which has a rod-shaped stopper at its tip and a piston rod that is reciprocated by an air cylinder and is placed inside a supply cylinder, fills a mold with a heating chamber outside a mold plate having slits. In a foamed resin molding device that is installed at the open end of the supply cylinder through a mold plate, a valve that communicates with an air passage provided in the raw material filling device through a wall of the device and communicates with the supply cylinder. A chamber is formed between the device and the lid by attaching a lid to a recess on the surface of the raw material filling device, and
The lid is provided with a through hole communicating with the outside, and an annular valve seat is formed with the through hole located inside the valve chamber, and the valve chamber below the valve seat has an area for closing the valve seat. and a foamed resin molding in which a valve plate shaped to close a part of the air passage is installed so as to be able to freely move up and down, and an actuating device that operates by controlling air circulation and stopping is connected to the through hole of the valve seat. Device.