JPS5829219B2 - Method and device for automatically removing foam molded products from molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for automatically taking out a foam molded product obtained by heating and foam molding a proof foamable thermoplastic resin from a mold. In addition to making it easier to take out the particles, it also prevents poor fusion that occurs when the expandable thermoplastic resin particles are heated to foam and fuse them together, or when filling the particles into the cavity of a foam molding mold. This also makes it easier to inspect defective products caused by poor filling, etc.

Conventionally, the cavity of a pair of foam molding molds consisting of a movable mold and a fixed mold is filled with foamable thermoplastic resin proofing, and the resin particles are heated with a heat medium such as water vapor or heated air. In the step of foaming the particles and fusing them together, cooling them, opening the pair of molds, and taking out the obtained foam molded product, the obtained foam molded product is separated from the mold. The conventional method used was to take the items out and stack them up while manually inspecting them visually, but this method was labor-intensive and time-consuming, and it was difficult to accurately detect defects such as fusion defects or filling defects by visually inspecting for defects, and it was also difficult to maintain hygiene. The above points also have drawbacks and inconveniences, such as the fact that it is undesirable for them to be handled by humans, and there has been a desire to improve productivity without requiring manual labor.

Therefore, in this invention, the removal of the foam molded product from the mold after foam molding is automated, and the above requirements can be satisfied. In a method of filling expandable thermoplastic resin particles into the cavities of a pair of foam molding molds and heating and foaming the resin particles with a heating medium to form a foam molded product, the molds are opened after foam molding and the foam molded product is formed. When taking out the foam molded product, the foamed molded product is inspected and taken out by vacuum suction using a rotatable suction head that is linked to the movable mold side.

Next, embodiments of the present invention will be described below with reference to the drawings, together with the inventive apparatus used for carrying out the embodiments.

First, in Fig. 1 showing the side view of the components, 1 is a fixed plate on the fixed mold side of the molding machine, 2 is a movable plate on the movable mold side of the molding machine, and 3 is a plate for sliding the movable plate 2 into a fixed position. The tie bar 4 is a cylinder, and the end of the cylinder 4 is attached to the machine frame 5, and the tip of the piston rod 41 of the cylinder 4 is attached to the above-mentioned moving plate 2 via a flange 42, and the moving plate 4 is attached to the moving plate 2. 2 can be moved up and down by the movement of a piston rod 41.

In addition, the above-mentioned fixed plate 1 has a bearing part 1 for the crank.
1 is provided, and a shaft 6 is inserted into the bearing portion 11,
A crank A and an air cylinder 7 are rotatably supported on the shaft 6.

On the other hand, a pin 8 is attached to the bearing portion 12 of the moving plate 2, and this pin 8 is attached at a position such that a line connecting the shaft 6 and the pin 8 becomes parallel to the tie bar 3. There is.

Further, a crank B is rotatably attached to the pin 8, intersecting with the previous crank A and rotatably connected to the shaft 9.

A suction head 13 for taking out the molded product is fixed to the shaft 9 via an arm 14.

Additionally, one end of a rank C is separately fixed to the shaft 9, and the other end of the crank C is a piston rod 71 of the air cylinder 7.
These cranks A and B are rotatably connected via a pin 16 intersecting with the side mounting bracket 15.

C and the air cylinder 7 constitute a crank mechanism section, and a suction head 13 is provided at the working end of the crank mechanism section to provide a turning action.

Further, 17 is a fixed cavity mold, 18 is a movable core mold, and 19 is a raw material hopper.

The suction head 13 is hollow and has a structure as shown in FIG. 2 in which a fine hole 31 and a piping hole 32 are formed.

3 and subsequent figures showing the process sequence, 20 is a controller, 21 to 26 are control valves, 27 is a vacuum source, 28 is a pressure air source, and 30 is a vacuum gauge.

To explain the operation sequentially, first, by opening the control valve 26, pressurized air enters the air cylinder 4.
The moving plate 2 is pushed upward via the piston rod 41 of the cylinder, closing the molds 17 and 18 (the state shown in FIG. 3).

Then, the mold cavity formed by the molds 17 and 18 is filled with foamable resin particles of thermoplastic resin such as polystyrene or polyethylene from the hopper 19, and then the molds 17 and 1
1000 ~ from the heating medium introduction hole provided on the mold cavity surface of No. 8
Steam heated to a temperature of 110° C. is blown into the mold cavity to perform heat foam molding.

After heating, the blowing of steam is stopped, and cooling water is introduced to cool the molded foamed product to an extent that it will not foam further. Then, air is introduced into the mold 18, and holes are opened in the mold 18. By releasing pressurized air through the slit, mold 1
Attach the foam molded product to 7.

Thereafter, the control valve 26 is opened and pressurized air is introduced into the control valve 26 to move the movable plate 2 downward and open the molds 17 and 18 (the state shown in FIG. 4).

Also, in conjunction with this moving plate 2, the space between crank A and crank B is opened.

Thereafter, the control valve 24 is opened and pressurized air is introduced into the control valve 23, so that the piston rod 71 of the air cylinder 7 moves forward, and the shaft 9 is rotated by the crank C.
A suction head 13 for taking out the molded product is rotated via an arm 14 fixed to the shaft 9 and comes directly below the mold 17 for the cavity.

(Situation shown in Figure 5).

Thereafter, a foam molded product 50 made of foamed polystyrene or other thermoplastic resin is dropped from the cavity mold 17 onto the suction head 13 using air or an eject pin.

This suction head 13 has pores 31. Since there is a piping hole 32, by opening the control valve 21, the suction head 13 is
A vacuum is created inside, and the foamed molded product 50 is adsorbed to the suction head 13 through the pores 31.

However, if the foamed molded product 50 does not completely adhere to the suction head 13, if the foamable thermoplastic resin particles are not adhered to each other by heating and foaming, or if the resin particles are not adhered to the mold cavity. If a defect occurs in the molded product 50 due to poor filling during filling, and the degree of vacuum in the suction head 13 decreases, the condition is detected by the vacuum gauge 30,
The controller 20 immediately stops the machine.

After confirming with the vacuum gauge 30 that there are no defects and that the foamed molded product 50 has been adsorbed to the suction head 13, the control valve 23 is opened and pressurized air is passed through the control valve 24, so that the air cylinder 7 The piston rod 71 moves backward, causing the shaft 9 to move up to the crank C and rotate (the state shown in FIG. 6).

Next, by opening the control valve 25 and passing pressurized air through the control valve 26, the movable plate 2 is moved upward, the molds 17 and 18 are closed, and the foam molded product 60 is moved to the suction head 13.
It rotates while attached to and returns to the horizontal position (the state shown in Figure 2).

Next, by stopping the control valve 21 and passing pressurized air through the control valve 22, air enters the suction head 13 and the pores 3
Since pressurized air is released through the foam molded product 50, the foamed molded products 50 are dropped to a certain position below and stacked.

The passage of pressurized air through the control valve 22 only takes about 1 to 2 seconds, and this control is performed by the controller 20.

Further, on the mold 17 and 18 side, after the mold closing is completed, the same operations of filling raw materials, heating, and cooling as already described, which constitute the next foam molding process, are performed.

In addition, in practice, if the cavity mold 17 and the fur mold 18 provided on the movable plate 2 and fixed plate 3 of the molding machine are not made of one silk, but can be provided in multiple sets in parallel, the suction head 13 Correspondingly, they can also be arranged in parallel so that they can be operated in series (see Figures 7 and 8), and in the case of such a multiple structure, they are used to advance and retreat the moving plate 2. A lock cylinder 60 and cranks D and E are provided to assist the cylinder 4.

In addition, in the above-mentioned collapse, it is also possible to use a hydraulic cylinder in addition to an air cylinder for part of the cylinder, and a mold that is divided into upper and lower parts is used as an example of a molding machine mold, but By changing the synthetic action of the crank and cylinder in the mechanism part, it becomes possible to implement this even in the case of a type of mold that is divided into left and right parts.

As described above, according to the present invention, expandable thermoplastic resin particles are filled into the cavity of a pair of foam molding molds consisting of a movable mold and a fixed mold, and the resin particles are heated and foamed with a heating medium. After the mold is cooled and the molding of the foamed molded product is completed, the mold is opened and the foamed molded product attached to the mold can be easily taken out using the vacuum suction effect of a rotatable suction head. Particularly, since part or all of the suction head's rotation is linked with the movable mold side of the molding machine, it is easier to synchronize the timing with the opening and closing of the mold, and the removal of the foam molded product is ensured.

Moreover, with this invention, when automatically taking out a foam molded product, the quality of the molded product can be inspected based on the degree of suction (degree of vacuum) by the suction head, and the above-mentioned molding defects can be detected by inspection. It becomes clear and the machine can be automatically stopped in the event of a defect, making unmanned operation possible.

Furthermore, since the above-mentioned inspection process can be performed between the molding stage and the mold release stage of the foamed molded product, no human labor is required, and it is also hygienic because it does not come into contact with human hands.

In addition, the foam molded products taken out and inspected by the suction head can be dropped one after another at the same position when the vacuum suction is released, so the foam molded products can be stacked automatically, which greatly reduces labor. can improve productivity.

Furthermore, as a device used to carry out the method of the invention, a suction head is actuated by a crank mechanism that is linked to the movable mold side and gives a turning motion to the working end, thereby realizing the ejection of the foamed molded product. This makes it possible to ensure the removal of the foam molded product and also to separate the structure into parts.

Moreover, the adsorption degree of the foam molded product (
Since it is connected to an inspection mechanism (degree of vacuum), it is suitable for continuous and automatic implementation of take-out inspections, and can greatly contribute to labor saving or promoting unmanned systems in foam molding equipment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view showing an overview of the molding machine and the take-out device, Fig. 2 is an enlarged sectional view of the suction head, and Figs. 3 to 6 are the order of steps. FIG. 7 is a front view showing a modified example of implementation, and FIG. 8 is a side view of the previous one. 1... Fixed plate, 2... Moving plate, 4... Cylinder on the molding machine side, 6...
...shaft, 7...crank side cylinder, 8
...Pin, 9...Axis, 11.12...
... Bearing part for crank, 13 ... Suction head, 14 ... Arm of suction head, 16 ...
...Axis, 20...Controller, 21-26...
...Control valve, 27...Vacuum source, 28...
・Pressure source, 30... Vacuum gauge, 31...
Pore of suction head, 50... Foamed molded product, A,
B, O... Crank.

Claims (1)

[Scope of Claims] 1. Filling the cavities of a pair of foam molding molds consisting of a movable mold and a fixed mold with foamable thermoplastic resin proofing, and foaming the resin particles by heating and foaming them with a heating medium. In the method of forming a molded product, when the mold is opened after foam molding and the foam molded product is taken out, the foam molded product is inspected and taken out by vacuum suction fitting using a rotatable suction head that works in conjunction with the movable mold side. A method for automatically removing characteristic foam molded products from molds. 2. A pair of foam molding molds consisting of a movable mold and a fixed mold is provided, and expandable thermoplastic resin particles are filled into the cavity of the mold, and the particles are added and foamed with a heating medium to perform foam molding. In the apparatus for obtaining the molded product, a crank mechanism is provided which is linked to the movable mold side and which imparts a rotating motion to the working end, and the working end of the crank mechanism is equipped with a suction head for taking out the molded product that can be vacuum-suctioned. The suction head can be rotated to the position of the foam molded product to take out the foam molded product, and the suction head is connected to an inspection mechanism for adsorption and attachment to the foam molded product. A device that automatically takes out foam molded products from molds. 3 As for the crank mechanism, one end of the crank is rotatably attached to a bearing provided on the movable mold side and the fixed mold side of the molding machine, and the other end of both cranks is equipped with a suction head for taking out the molded product. The arm is rotatably attached to a fixed shaft, and one end of a separate crank is attached to the shaft, and the other end of the crank is connected to the piston rond of the cylinder that acts after interlocking with the movable type side. An apparatus for automatically taking out a foamed molded product according to claim 2, which is connected to each other, from a mold. 4. An apparatus for automatically taking out a foamed molded product from a mold as claimed in claim 2, wherein the suction head is provided with suction pores and piping holes. 5. An apparatus for automatically taking out a foam molded article from a mold as claimed in claim 2, which is equipped with a plurality of suction heads corresponding to a plurality of molds and operated in series.