JPH0126412Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field This invention relates to an injection molding device.

Prior Art In a conventional injection molding apparatus, an injection screw and a mold clamping mechanism are mounted in opposing horizontal directions, and a mold is mounted between them. For this reason, only one type of mold can be used, although a large amount of installation space is required due to the movement space of the mold clamping mechanism in the left and right directions around the mold and the space for arranging the injection screw shaft in the injection mechanism. This had the problem of poor molding efficiency.

Purpose of the invention In view of the above-mentioned conventional drawbacks, the purpose of the present invention is to provide an injection molding apparatus that has a simple configuration and can perform injection molding operations efficiently in a small installation space.

Example The present embodiment will be described below with reference to the drawings.

1 and 2, first and second injection mechanisms 3 and 4 are attached to a main body frame 2 of an injection molding apparatus 1, which are arranged in two slightly diagonal upper and lower stages. These first and second injection mechanisms 3, 4
This is a known type in which an injection screw that rotates inside the barrels of injection cylinders 5 and 6 is attached, and pellet-shaped synthetic resin supplied from hoppers 7 and 8 is melted and injected from an injection nozzle as the injection screw rotates. belongs to. Further, the injection screws in the first and second injection mechanisms 3 and 4 are arranged approximately in two stages, upper and lower. and the first injection mechanism 3
is attached to the main body frame 2 via an injection shift cylinder 9, and is reciprocated in the horizontal direction.
As a result, the first injection mechanism 3 brings the injection nozzle into pressure contact with the parting surface of the clamped first mold, which will be described later. Further, the second injection mechanism 4 is swingably attached to the main body frame 2 via a support shaft 10. And this second injection mechanism 4
is attached to the injection nozzle, and the nozzle touch 11 is pressed against the center hole of a clamped second mold, which will be described later. Incidentally, the nozzle touch 11 is provided with a position adjustment screw 1 supported by the main body frame 2.
2 is attached, and the contact position of the nozzle touch 11 with respect to the second mold is changed as appropriate.

A pair of upper and lower fixing plates 20 and 21 are attached to the main body frame 2, and the fixing plates 2
0 and 21, four guide shafts 22 are fixed in the vertical direction. This guide shaft 22 has a first
A first movable plate 24 to which one mold 23a of the mold 23 is attached is fitted and supported so as to be movable in the vertical direction. This first mold 23 has a runner groove on its parting surface into which resin is injected. A rod of a mold clamping cylinder 25 fixed to the fixed plate 20 is fixed to the first movable plate 24. Further, an auxiliary guide shaft 26 is fixed to the fixed plate 21. The guide shaft 22 and the auxiliary guide shaft 26 each have a second mold 23b of the first mold 23 on the lower surface and a second mold 27a of the second mold 27 on the upper surface thereof. 2
A movable plate 28 is inserted and supported. This second mold 27 is of a type having a runner hole in the center of the other mold 27b through which synthetic resin is injected. The downward movement width of the second movable plate 28 is regulated by the auxiliary guide shaft 26. The other mold 27b of the second mold 27 is fixedly held on the lower surface of the fixed plate 21.

Next, the operation of this embodiment will be explained with reference to FIG.

First, one mold 23a is fixed to the upper surface of the first movable plate 24, and the other mold 23b is fixed to the lower surface of the second movable plate 28. Further, one mold 27a is fixed to the upper surface of the second movable plate 28, and the other mold 27b is fixed to the lower surface of the fixed plate 21, respectively. The second injection mechanism 4 has a position adjusting screw 12.
As a result, the nozzle touch 11 is swung to a position in the runner hole of the other mold 27b.

When the mold clamping cylinder 25 is operated in the above state, the first movable plate 24 and the second movable plate 28
moves upward along the guide shaft 22, and the first mold 23
And the second mold 27 is clamped in the vertical direction. When the injection shift cylinder 9 is operated in this state, the first injection mechanism 3 moves in a horizontal direction perpendicular to the guide shaft 22 and brings its injection nozzle into pressure contact with the parting surface of the first mold 23. Further, by the mold clamping operation, the second injection mechanism 4 presses its nozzle touch 11 into contact with the runner hole in the clamped second mold 27.

After the above operation, when the injection screws of the first and second injection mechanisms 3 and 4 are rotationally driven, the first mold 23 is exposed to the runner groove formed on the parting surface, and the second mold 27 is Molten synthetic resin is injected from the runner hole to which the nozzle touch 11 is pressed. After the synthetic resin injected into the first mold 23 and the second mold 27 is cured,
As the injection shift cylinder 9 moves back, the first injection mechanism 3 separates its injection nozzle from the parting surface of the first mold 23. Furthermore, when the mold clamping cylinder 25 is moved back, the first movable plate 24 and the second movable plate 28 move toward the guide shaft 2 due to their own weight.
2, and the first mold 23 and the second mold 27 are released, respectively. Injection molding is performed by the above operations.

Further, when injection molding is performed using only the first mold 23 having runner grooves on the parting surface, the lower surface of the fixed plate 21 or the second movable plate 28
A spacer block (not shown) is attached to the upper surface of the first movable plate 24, and one mold 2 is attached to the upper surface of the first movable plate 24.
3a, and the other mold 23b is attached to the lower surface of the second movable plate 28, respectively. And mold clamping cylinder 2
After the injection nozzle of the first injection mechanism 3 is positioned on the parting surface of the first mold 23 by the operation of step 5, the injection nozzle of the first injection mechanism 3 is positioned on the parting surface of the first mold 23 by the operation of the injection shift cylinder 9. Injection molding is performed by pressing against the parting surface of the mold 23.

On the contrary, a second mold 2 having a runner hole in the center
When performing injection molding using only the mold 7, after installing a spacer block (not shown) in place of the first mold 23, the second mold 27 is clamped by the operation of the mold clamping cylinder 25. After that, the second injection mechanism 4
The synthetic resin is injected into the second mold 27.

Therefore, in this embodiment, the first injection mechanism 3 and the second
The injection mechanisms 4 are arranged in two stages, upper and lower, and the
By clamping the second mold 23 and the second mold 27 in the vertical direction, the installation space of the injection molding apparatus can be reduced, and the injection molding work can be performed efficiently. Furthermore, since the second mold 27 having a runner hole in the center and the first mold 23 having a runner groove in the parting surface can be used with one injection molding device, there are no restrictions on the type of mold. Injection molding work can be performed efficiently without any problems.

In addition, in this embodiment, the first and second injection mechanisms are arranged in upper and lower stages that are slightly diagonal, and the first mold 23 has a runner groove on the parting surface and/or the second mold 23 has a runner groove in the center. The injection molding device is of a type in which a mold 27 is attached, but the present invention is based on the first
It is also possible to implement a configuration in which the second injection mechanism is arranged in two substantially parallel upper and lower stages, and the first and second molds having runner grooves on the parting surface are mounted.

Effects of the Invention As explained above, the present invention includes first and second movable plates that are slidably supported in the axial direction with respect to a guide rod provided between a pair of opposing fixed plates; a first mold disposed to face each other between the movable plate and the second movable plate, and a second mold disposed to face each other between one fixed plate and the second movable plate. a mold, a mold clamping device that is connected to the first movable plate and clamps the first and second molds as the first movable plate is driven; When the first and second molds are clamped, the first injection mechanism is arranged such that the injection nozzle contacts the sprue of the first mold. This injection molding apparatus is capable of efficiently performing injection molding work in a small installation space due to its simple configuration including a second injection mechanism arranged so as to come into contact with the sprue of the second mold.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing the outline of the injection molding apparatus, FIG. 2 is a schematic left side view with the mold removed, and FIG. 3 is an explanatory view showing the operating state. In the figure, 3 is a first injection mechanism, 4 is a second injection mechanism, 23 is a first mold, 25 is a mold clamping cylinder constituting the mold clamping mechanism, and 27 is a second mold.

Claims (1)

[Claims for Utility Model Registration] First and second movable plates supported slidably in the axial direction with respect to a guide rod provided between a pair of opposing fixed plates; the first movable plate; a first mold arranged to face each other between the second movable plates; a second mold arranged to face each other between one fixed plate and the second movable plate; a mold clamping device connected to the first movable plate and clamping the first and second molds as the first movable plate is driven; and when the first and second molds are clamped, injection is performed. a first injection mechanism arranged such that a nozzle abuts a sprue of the first mold; and when the first and second molds are clamped, the injection nozzle contacts the sprue of the second mold; An injection molding apparatus comprising: a second injection mechanism arranged so as to come into contact with a sprue;