JPH0430898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an injection molding apparatus, and more particularly to an injection molding apparatus characterized by a structure for holding mold clamping force.

(Background Art) Conventionally, in an injection molding apparatus in which a mold is slidably arranged and a plurality of mold clamping devices are disposed on one side to clamp the mold, the mold clamping direction is The mold clamping force holding part needs to have a fairly rigid structure to withstand the moment force caused by the positional misalignment between the mold clamping force holding part and the mold clamping force holding part, which has the disadvantage that there is a limit to the mold clamping force that can be generated.

In addition, as other conventional techniques, for example,
No. 26811 discloses a technique in which a fixed mold and a movable mold are provided in a frame-like frame, and the movable mold is opened and closed along a guide via a mold clamping mechanism.

However, this prior art has the drawback that the mold thickness adjustment mechanism is located inside the device, making it difficult to perform adjustment work.

(Object of the invention) The present invention has been proposed in view of the above-mentioned drawbacks.
The purpose is to provide an injection molding apparatus that can stably maintain mold clamping force and improve mold clamping function and mold clamping force.

(Disclosure of invention) The present invention will be explained below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In FIG. The clamping device shown in FIG. It can slide back and forth in the direction of arrow a. Furthermore, a sliding arm 5 is in contact with the side surface of the mold 1 on the platen 3.

On the other hand, a mold clamping cylinder 6 is disposed on the back surface of the platen 3, and the lower end of a substantially triangular crank 8 rotatably supported by a pivot shaft 7 near the back surface of the platen 3 is connected to the tip of the cylinder rod 6a. ing. Furthermore, the upper end of this crank 8 is
The connecting rod 9 is connected to the lower end of a connecting rod 9 that passes through a through hole 3a provided in the platen 3.

Further, near the end of the surface of the platen 3, a mold clamping holding block 10 is fixed to the surface of the platen 3 with mounting bolts 11. And platen 3
A wall surface 3b that protrudes in the direction in which the mold clamping device constituted by the mold clamping holding block 10 and the sliding arm 5 is disposed is provided at the peripheral end of the surface of the mold. , the mold thickness adjustment handle 12 with the tip of the threaded portion 12a in contact with the side surface of the mold clamping holding block 10 is attached to the lock nut 13.
It is installed through. That is, by rotating the mold thickness adjustment handle 12 as a mold thickness adjustment part, the threaded part 12a moves forward by the feed screw action with the threaded part of the protruding wall surface 3b, and the mold clamping holding block 10 is moved in the mold clamping direction. The mold clamping holding block 10 is configured such that the position of the mold clamping holding block 10 can be fixed. Note that a mold thickness adjustment section is constituted by the mold thickness adjustment handle provided with the threaded portion 12a, the lock nut 13, and the like.

Further, at the upper end of the connecting rod 9, there are toggle links 1 each having one end connected to the end of the sliding arm 5 and the mold clamping holding block 10.
4 and 15 are connected to each other by a joint pin 16.

Note that the sliding arm 5 and the mold 1 are connected and fixed by square grooves, bolts, etc. (not shown).

To explain the mold clamping operation in this embodiment, when the cylinder rod 6a of the mold clamping cylinder 6 is pushed out, the crank 8 rotates about the pivot 7, so that the connecting rod 9 is pulled down. Along with this, both the left and right toggle links 14 and 15 move to a horizontal state, but one end of one toggle link 15 is supported by the mold clamping holding block 10 positioned by the mold thickness adjustment handle 12. For,
The end of the other toggle link 14 moves to the left in FIG. 1, causing the mold 1 to move toward the center of the platen 3 via the sliding arm 5. At this time, the mold thickness adjustment handle 12 equipped with the threaded part 12a
A mold thickness adjustment section constituted by a lock nut 13 and the like reliably maintains a stable mold clamping force of the mold 1 via the mold clamping holding block 10 and the sliding arm 5.

Then, the mold 1 is butted against the opposing mold, and the mold clamping of each mold clamping device is completed in sequence. In this embodiment, only one mold clamping device is shown for convenience, but a plurality of mold clamping devices may be provided on the pteran 3 as necessary. Thereafter, the injection nozzle of the injection unit advances into the injection nozzle forward and backward movement space 2, and injection molding is performed.

According to this embodiment, a wall surface 3b is provided at the peripheral end of the platen 3 and a mold thickness adjustment section 12 is provided on this wall surface 3b using a toggle method, so the structure is simple and adjustment can be easily made from the outside. It can be performed.

In this embodiment, the shape of the crank 8 is not limited to the illustrated example, and the output of the clamping cylinder 6 can be increased by appropriately changing the shape.

Next, FIG. 2 shows a second embodiment of the present invention. In this embodiment, a keyway 3d is formed on the upper surface of the protruding wall surface 3c of the platen 3A.
A mold thickness adjustment key 17 as a mold thickness adjustment part is attached to d, and the side surface of this mold thickness adjustment key 17 on the mold clamping holding block 10' side is made into a tapered surface 17a along the length direction of the keyway 3d. It is. In addition,
In FIG. 2, the same members as in FIG. 1 are given the same numbers and their explanations will be omitted.

According to this embodiment, the mold-clamping holding block 10' can be firmly held by the mold-thickness adjustment key 17, and a stable mold-clamping force can be obtained. By moving the mold thickness adjustment key 17, the fulcrum position of one toggle link 15 can be adjusted, and the optimum mold clamping force according to the mold thickness of the mold 1 can be obtained.

FIG. 3 shows a third embodiment of the invention. In this embodiment, protruding wall surfaces 3e are formed on the surface of the platen 3B to accommodate, for example, six mold clamping devices, separated from each other, and a mold thickness adjustment section is provided on the protruding wall surfaces 3e. This has the advantage of providing an injection molding device that facilitates surface processing. Further, the number of mold clamping devices may be any plurality.

FIG. 4 shows a fourth embodiment of the present invention, in which a protruding wall surface 3f is formed around the entire surface of a substantially disc-shaped platen 3c, and a mold thickness adjustment section is provided on this protruding wall surface 3f. be. That is, in this embodiment, a shallow cylindrical groove is formed inside the wall surface 3f, and this is a groove in which the mold reciprocates on one surface of the platen 3C and a mold clamping device. The structure is the same as that provided with a groove portion in which the material is buried. This embodiment is convenient for installing the mold clamping device in any position, and has the advantage that if the position can be adjusted in the circumferential direction, it is possible to butt molds at irregular angles. .

(Effects of the Invention) As described above, according to the present invention, in an injection molding apparatus in which a mold clamping device is disposed on one side of a platen on which a mold is slidably disposed, one side of the platen is A wall surface protruding in the direction in which the mold clamping device is disposed is formed at the peripheral end, and a mold thickness adjustment section is disposed on this wall surface, and the mold clamping device is connected to the mold and the mold clamping holding member. Since the mold clamping holding member is held by the mold thickness adjustment part, the structure is simple and adjustment can be easily performed from the outside. In addition, the mold clamping force holding device can maintain a stable mold clamping force via the mold clamping device, which has the effect of stabilizing and strengthening the mold clamping function.

In addition, there is no misalignment between the mold clamping direction and the mold clamping device, and it is possible to prevent excessive force from being applied to the mold clamping device due to the moment force caused by this misalignment, which reduces the rigidity of the mold clamping device. It has the advantage of simplifying the structure.

[Brief explanation of drawings]

FIG. 1A is a plan view showing the first embodiment of the present invention;
Figure B is an enlarged sectional view taken along line A-A in figure A, Figure 2 is a plan view showing the second embodiment of the present invention, Figure 3 is a sectional view taken along line B-B in figure I, and Figure 3 is I. 1 is a plan view of a platen showing a third embodiment of the present invention, and FIG.
-C sectional view and FIG. 4 are plan views of a platen showing a fourth embodiment of the present invention. 3, 3A, 3B, 3C... platen, 3b, 3
c, 3e, 3f...Protruding wall surface, 12...Mold thickness adjustment handle, 12a...Screw portion, 13...Lock nut, 17...Mold thickness adjustment key.

Claims (1)

[Scope of Claims] 1. In an injection molding apparatus in which a mold clamping device is disposed on one surface of a platen on which a mold is slidably disposed, the mold clamping device is disposed on a peripheral end of one surface of the platen. A wall surface protruding in the direction in which the device is disposed is formed, a mold thickness adjustment section is disposed on this wall surface, and the mold clamping device is configured with a toggle mechanism that connects the mold and the mold clamping holding member. . An injection molding apparatus further characterized in that the mold clamping holding member is held by a mold thickness adjusting section.