JPH0320326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a foam molding apparatus used for performing foam molding by injecting a foam resin liquid of polyurethane resin between a core material and a skin.

Conventionally, in this type of equipment, the outer skin is set in the lower part of the mold, a foaming resin liquid is injected onto it, and then the core material is set in the upper mold and the mold is closed to perform foam molding. Due to natural foaming, there is a limit to the production of products with complex and thin shapes, and foaming time is also long, so when producing in large quantities, it is common practice to use a conveyor system that circulates a large number of molds on a conveyor. -Refer to Publication No. 33262), which is accompanied by the inconvenience of increased space and equipment costs.

In order to eliminate such inconveniences, the present invention aims to provide an apparatus that can efficiently foam and form thin-walled products using as few molds as possible. A foam molding device that performs foam molding by injecting a foam resin liquid into a mold consisting of an upper mold and a lower mold, and a mold opening/closing device comprising a vertically movable opening/closing head that engages with the upper mold; A common method is provided in which a first station is provided with an injection device that injects foamed resin liquid at high pressure from an injection port in the peripheral wall of the mold, and second stations on both sides of the first station, and the common station is laid across both second stations. A pair of molds are mounted on a guide rail, and each of the molds can be alternately reciprocated between the second station and the first station,
Each of the molds includes a lock mechanism in which a lock piece having a claw portion at a lower end that can be engaged with the lower mold is pivoted to the upper mold so as to be biased in the engaging direction by a spring, and the mold opening/closing device. a lock release piece having a recessed part at the lower end that engages with the upper end of the lock piece, the lock release piece being pivotally connected to the opening/closing head; and a lock release cylinder that is mounted on the opening/closing head and swinging the lock release piece. The invention is characterized in that it is provided with a release mechanism consisting of.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawing, 1 indicates the upper mold 2 for setting the core material a and the outer skin b.
A pair of molds 1 are provided reciprocally between a first station A and second stations B on both sides thereof, respectively.

To explain this in more detail, each mold 1 is mounted on a guide rail 5 installed between a second station B on one side and a second station B on the other side on a pedestal 4 on the lower surface of the lower mold 3. The molds 1 are connected to each other via a connecting rod 6, and a rack 7 is provided on the lower surface of the pedestal 4 of one of the molds 1, so that the rack 7 and the molds 1 are connected to each other. A pinion 10 that can move forward and backward by a conveying cylinder 9 is inserted between the opposing lower fixed rack 8, and the cylinder 9
As the pinion 10 moves back and forth, the one mold 1
is reciprocated between the first station A and the second station B on one side, and the mold 1 on the other side is accordingly reciprocated between the second station B on the other side and the first station A. I did it like that.

In the illustrated example, the guide rails 5 are provided in two stages, upper and lower, and the pedestal 4 is supported by the lower guide rail 5 on a pedestal 4a protruding therefrom, and the guide rollers 5a provided on the upper guide rail 5 are used to support the pedestal 4. The movement of the pedestal 4 is guided.

Here, the first station A includes a mold opening/closing device 11 for opening and closing the upper mold 2, and a foaming resin liquid injection device 1.
As clearly shown in FIG.
As shown in FIG.
an engagement pin 19 that is removably engaged with the
Thus, when the opening/closing head 16 is moved upward while the engagement pin 19 is engaged with the engagement hole 17a, and the swing arm 14 is pivoted upward, the upper mold 2
is separated from the lower mold 3 and opened, and its reverse operation causes the upper mold 2 to be closed. 1 in drawings
Reference numeral 6a indicates a lifting guide bar for the opening/closing head 16.

The injection device 12 is used to inject a foamed resin liquid such as a polyurethane resin liquid into an upper mold 2 and a lower mold 3 through an injection port 20 provided on the peripheral wall of a lower mold 3 of a mold 1 to form a core material a and a skin b. It is configured to inject at high pressure into the molding space between the two, and as shown in FIG. With the nozzle 24 fitted into the injection port 20 as the movable frame 22 moves forward, the injection cylinder 23 is operated to inject the foamed resin liquid at high pressure. To prevent the mold 2 from being opened, each mold 1 is provided with a locking mechanism 24 for locking the upper mold 2 in the closed position, and the mold opening/closing device 11 is further provided with a locking mechanism 24 to release the locking mechanism 24. A release mechanism 25 is provided. As clearly shown in FIG. 4, the locking mechanism 24 includes a locking piece 26 having a claw portion 26a at the lower end that engages with the lower molding die 3, which is pivoted to the upper molding die 2, and the locking piece 26 is constantly engaged by a spring 27. shall be biased in the direction,
Further, the release mechanism 25 has a lock release piece 28 pivotally mounted on the opening/closing head 16 of the mold opening/closing device 11, and has a recessed notch 28a at the lower end that engages with the upper end of the lock piece 26. can be freely swung by a lock release cylinder 29 provided on the head 16 via a lever 30 integrated with the release piece 28,
When the release piece 28 swings inward, the lock piece 26 swings in the direction of detaching from the lower die 3 against the spring 27, and the lock is released.

Next, to explain its operation, first, in the state shown in the first figure, the upper mold 2 of one of the molds 1 existing in the first station A is opened by the mold opening/closing device 11.
After setting the core material a in the upper mold 2 and the skin b in the lower mold 3, the upper mold 2 is closed by the opening/closing device 11, and then the injection nozzle 24 is inserted into the injection port 2 by the operation of the injection device 12.
0 and inject foaming resin liquid under high pressure between the core material a and the skin b, and then release the engagement between the engagement hole 17a and the engagement pin 19, and move the opening/closing head 16 to the upper mold 2. The injection nozzle 24
is removed from the injection port 20, and the one mold 1 is transported from the first station A to the second station B on one side. At this time, the upper mold 2 is locked in the closed position by the locking mechanism 24 and will not be opened even if the internal pressure increases due to foaming.

Also, according to this transportation, the other mold 1 is carried from the second station B on the other side to the first station A, so the opening/closing head 16 is moved over the other mold 1 by the operation of the mold opening/closing device 11. At the same time as engaging the mold 2, the locking mechanism 24 is unlocked by the operation of the release mechanism 25 to open the upper mold 2, and the product previously foam-molded in the other mold 1 is released and taken out. . Next, new core material a and skin b are set in the upper mold 2 and lower mold 3 of the other mold 1, and after injecting the foamed resin liquid in the same manner as above, the other mold 1 is replaced. The one mold 1 is transported from the first station A to the second station B on the other side, and the one mold 1 is carried from the second station B on one side to the first station A, and is waiting at the second station B on the one side. Take out the foam-molded product.

Then, foam molding is continuously performed by repeating the above operations.

As described above, according to the present invention, a pair of molds is made to be able to reciprocate alternately between the first station and the second stations on both sides of the first station along a common guide rail, and the first station At the second station, while the upper mold of one of the molds was opened by the mold opening/closing device to take out the product, and the upper mold was closed and the injection device was injecting new foamed resin liquid. Foam molding is performed using the other mold, and with a small and simple device that uses only two molds, products can be produced continuously and efficiently without loss time due to foaming time, reducing equipment costs and space. In addition, since the foamed resin liquid is injected into the mold at high pressure by the injection device, each mold is equipped with an upper mold locking mechanism, and the foamed resin liquid is not limited to the molded shape. A good foamed molded product can be obtained, and the lock mechanism is released by a release mechanism provided in the mold opening/closing device, so that the opening operation of the upper mold at the first station is not hindered, and the upper mold is Since opening and closing is performed only at the first station, it is sufficient to provide only one mold opening/closing device at the first station, and the locking mechanism and release mechanism are configured as a simple swinging type.
This has the effect of further reducing equipment costs.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an example of the device of the present invention;
2 is a side view taken along the line -- in FIG. 1, FIG. 3 is a partially cutaway front view of the main part of the mold opening/closing device, and FIG. 4 is a side view thereof. A...First station, B...Second station, 1...Molding mold, 2...Upper mold, 3...Lower mold,
11... Mold opening/closing device, 12... Injection device, 24...
...Lock mechanism, 25...Release mechanism.

Claims (1)

[Claims] 1. A foam molding device that performs foam molding by injecting a foamed resin liquid into a mold consisting of an upper mold and a lower mold; a first station equipped with an injection device for injecting foamed resin liquid at high pressure into the mold from an injection port in the peripheral wall thereof; and second stations on both sides thereof.
a station, a pair of molds are mounted on a common guide rail laid across both second stations, and each mold is placed between the second station and the first station. Each of the molds has a lock piece having a claw portion at a lower end that can be engaged with the lower mold, and is pivoted to the upper mold so as to be biased in the engaging direction by a spring. a lock mechanism comprising: a lock release piece having a concave notch at a lower end that engages with an upper end of the lock piece, which is pivotally connected to the opening/closing head of the mold opening/closing device; 1. A foam molding device comprising a release mechanism comprising a lock release cylinder that swings a lock release piece.