JPS6237712Y2 - - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to the field of safety measures technology for injected resin in resin injection molding.

Therefore, in this idea, a movable mold is clamped close to the fixed mold installed on the base via a ram, and the mold is opened apart from each other, and in the clamped state, the injection nozzle of the injection molding machine attached to the mold is connected to both molds. This invention relates to an injection molding device in which resin is injected into a cavity by advancing into an injection port, and in particular, a shielding plate attached to a support bar vertically installed on one of both molds is used to inject resin from the injection port during mold clamping injection molding. This relates to an injection molding apparatus which is separated and linked to cover the injection port when the mold is opened to ensure safety against unexpected resin injection.

In well-known conventional injection molding equipment, a movable mold is clamped against a fixed base set mold, and the injection nozzle of the molding machine is faced to the injection ports of both clamped molds to inject resin into the cavity. I'm trying to mold it.

After molding, the injection nozzle retracts and the movable mold rises, at which point the mold opens and the molded product is removed. In this state, the injection nozzle is positioned so that it faces the injection port at a fairly close distance in preparation for re-molding, away from the mold opening to a degree that does not interfere with mold opening.

Therefore, if the injection button of the injection molding machine is accidentally activated during the mold opening operation, high temperature liquid resin will be ejected from the injection nozzle, hitting the mold and scattering around, which is extremely dangerous. Moreover, there are disadvantages in that not only the mold but also the product may be contaminated, resulting in product defects, and mold cleaning requires time and effort, prolonging the molding cycle.

The purpose of this invention was to solve the problems associated with unexpected resin ejection when opening the mold of the resin injection molding equipment based on the conventional technology mentioned above, and to avoid interference with the injection nozzle and injection port when molding on the mold side, and to prevent the mold from interfering with the injection nozzle and injection port. We have developed an excellent injection molding machine that has a mechanism that links the shielding plate to the mold opening process so that the injection nozzle is shielded by the mold to increase safety when the mold is opened, and the mold is not contaminated and the products taken out are not adversely affected. This is what we intend to provide.

The structure of this invention, which meets the above-mentioned purpose, is that during the process of lowering the movable mold to join the fixed mold and clamping the mold, the shielding plate that was facing the injection nozzle of the injection molding machine and shielding it is removed from both molds. The injection nozzle of the injection molding device advances and faces the injection port to perform predetermined injection molding and molding. After the injection nozzle retracts, the shielding plate also rises in conjunction with the support bar as the movable mold moves up, and the product is taken out while the mold is open and the injection nozzle is shielded. Even if high-temperature resin unexpectedly spouts out from the injection nozzle, it is shielded by the shielding plate so that work can be carried out safely, and the resin is not scattered on the mold or product.

Next, one embodiment of this invention will be described below based on the drawings.

1 is a fixed type, and is installed on a base 2, and a pair of support bars 3, 3 are vertically mounted on bolts 4 from the front part of the lower frame, and each support bar 3 is attached on both sides. A lumen 6 is provided with axially extending slits 5,5.

A slider 8 is movable up and down along the inner cavity 6 via a spring 7 provided in the inner cavity 6, and an arm 9 extending through each slider 8 is A shielding plate 13 that moves up and down along the slit and has a top plate 10, side plates 11, 11, and a back plate 12 is fixedly provided.

On the other hand, reference numeral 14 is a movable type, and the fixed type 1 is provided on a ram connected to a crank mechanism (not shown).
The mold can be closed close to the fixed mold and the mold can be opened apart from the fixed mold, and an injection port 15 and a cavity 16 are formed when the mold is clamped with the fixed mold.

Further, a pair of push rods 17 are fixedly attached to both sides of the front part of the upper frame of the movable mold 14 and extend downwardly so as to be able to abut and engage with both ends of the arm 9.

Reference numeral 18 is a conventionally well-known injection molding machine, which is fixed to the base 2 and attached to the fixed mold 1, and whose injection nozzle 19 faces the injection port 15 so as to be able to advance, retreat, and come into contact with it.

In the above structure, in the state before the mold clamping shown in FIGS. 1a and 1b, the sly 8 is biased by the spring 7 to position the bar 9 at the upper limit of the slit 5, and the shielding plate 13
The injection nozzle 19 is placed in a position facing and shielding the injection nozzle 19 which is retreated into the molding machine 18.

Therefore, when the movable mold 14 is lowered via a ram (not shown) to clamp the mold, the push rods 17, 17 on both sides of the front portion of the movable mold 14 come into contact with both sides of the arm 9 and move along the slit 5 against the spring 7. Then, the shielding plate 13 is integrally shifted from the injection port 15 and lowered.

Then, as shown in FIG. 2, when the movable mold 14 is combined with the fixed mold 1 and clamped, and the injection port and cavity 16 are formed, the shielding plate 13 is sufficiently separated from the injection port 15. ing.

Next, the injection nozzle 19 of the injection molding machine 18 advances through a predetermined control mechanism, faces the injection port 15 without being obstructed by the shielding plate 13, injects high-temperature resin, and forms a product of a predetermined shape into the cavity 16. to be formed.

After the molding is completed, the injection nozzle 19 retreats, and then the movable mold 14 rises in the reverse process to the above-mentioned process to proceed to the mold opening process, so that the spring 7 is shielded through the upward pressure of the arm 9. Board 1
3 is raised so that at the upper limit of the slit 5, the shielding plate 13 faces and shields the injection nozzle as described above.

In this state, the mold is opened and the product is taken out.
Even if high-temperature resin liquid is ejected from the injection nozzle 19 due to an accident such as pressing the activation button of the molding machine during this process, it will immediately collide with the shielding plate 13, and the liquid that is about to spread will be bent by the back plate 12. It is reflected by the upper plate 10 and the side plate 11 and falls downward from the lower opening, and of course there is no danger of it falling on the molds 1, 14 or the products to be taken out. Not at all.

Therefore, there is no maintenance work to deal with this, and the mold is moved to the next mold clamping step.

The fallen resin may be removed as appropriate, or depending on the design, a cloth bag or the like may be suspended from the shielding plate and stored therein to be removed.

Further, in the embodiment shown in FIG. 3, a support bar 3' is extended downwardly from the front part of the movable mold 14, and a shielding plate 13 is attached via an arm 9'. In other words, the relationship is fixed, and the substance of the action and effect does not change.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments; for example, various embodiments can be adopted, such as making the shield plate in a rotating opening/closing relationship with the support bar.

As mentioned above, according to this invention, even if high-temperature resin liquid is unexpectedly injected from the injection nozzle during the mold opening and product removal process after injection molding, it will not be injected into either the fixed mold or the movable mold. Not only does it provide excellent effects that ensure extremely high safety, as the liquid does not scatter or spread to workers, etc., but it also eliminates unnecessary maintenance such as cleaning dirt on molds, etc. There is an advantage that it is not necessary.

Furthermore, since it does not scatter onto the products taken out, it also has the advantage that it does not affect the product yield.

Therefore, the shielding nozzle facing the injection nozzle is attached to a support bar provided on either the fixed type or the movable type in conjunction with the opening of the movable mold clamping mold, so that it can be shielded and opened. The purpose can be achieved without using a synchronization mechanism or power, and the structure is simple, easy to install, and requires almost no maintenance.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and Fig. 1a is a front view of a movable mold, Fig. 1b is a front explanatory view of one embodiment of a shielding plate provided on a fixed mold, and Fig. 2 is a diagram showing a state in which the mold is closed. The side view and FIG. 3 are schematic views of another embodiment. 1... fixed type, 15... injection port, 18... molding machine, 13... shielding plate, 14... movable type, 19...
Injection nozzle, 3, 3'... support bar.

Claims (1)

[Scope of utility model registration request] In an injection molding machine comprising a fixed mold and an injection nozzle that moves forward and backward facing an injection port formed by a movable mold that is provided opposite to the fixed mold so as to be able to move toward and away from the fixed mold, the fixed mold and the movable mold are The injection nozzle shielding plate is provided on a support bar vertically disposed on either side of the mold, and the shielding plate is separated from the injection port when the mold is closed and is located at the injection port position when the mold is open. An injection molding device, characterized in that it is attached to the support bar.