JPH0459129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding apparatus, and more particularly to an injection molding apparatus having features in the structure of a mold clamping device and the positioning of a mold clamping link.

(Background Art and Problems to be Solved by the Invention) Conventionally, in an injection molding apparatus, when performing mold clamping by disposing a plurality of mold clamping devices on one side of the platen, the mold clamping part and the mold clamping cylinder are connected to the platen. If they are placed on the same side, there is a problem that the safety cover etc. must be made larger and the device becomes larger. on the other hand,
If there is a mold clamping cylinder on the transport side of the mold or molded product,
Another problem is that it is difficult to operate.

Also, JP-A-52-138550 and JP-A-49-
According to the technology described in Publication No. 989, the opening angle of the mold clamping link during mold clamping is set by adjusting the stroke of the mold clamping cylinder, so stroke adjustment is complicated and the mold clamping direction and mold Against moment force caused by misalignment of the tightening and holding part, etc.
The mold clamping force retaining part needs to have a fairly rigid structure, which poses a problem in that it complicates the structure.

The present invention was proposed in view of the above-mentioned drawbacks.
The purpose of this invention is to provide an injection molding device that is smaller in size, has a simpler structure, and has improved operability.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an injection molding apparatus in which a mold clamping device is disposed on one side of a platen and a mold clamping cylinder is disposed on the other side. A stopper connects a mold clamping link to a mold clamping holding block constituting a mold clamping device and presses a bottom plate of the mold clamping holding block against one surface of the platen via the mold clamping link driven by the mold clamping cylinder. Accordingly, the maximum opening angle of the mold clamping link is set so that the opening angle is approximately 180 degrees.

(Function) With the above configuration, according to the present invention, the mold clamping link is connected to the mold clamping holding block, and the bottom plate of the mold clamping holding block is connected to one side of the platen via the mold clamping link driven by the mold clamping cylinder. By using a pressing stopper, the tensile force of the mold clamping cylinder acts on the mold clamping holding block, canceling the moment caused by the unbalanced mold clamping force applied to the mold clamping holding block, and preventing the mold clamping holding block from lifting up. It becomes possible to do so.

Further, since the opening angle of the mold clamping link is set to approximately 180 degrees by the stopper during mold clamping, the greatest mold clamping force can be obtained at this time, and there is an advantage that stable holding force can be obtained.

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

1 and 2 show a first embodiment of the present invention. In FIG. 1, 1 indicates a mold, and this mold 1 is a space 2 in which an injection nozzle (not shown) moves back and forth.
It is sandwiched between a platen 3 and an upper cover 4, which hold a sliding arm 5, mold clamping links 13 and 14, and a mold clamping holding block 1, which will be described later.
It is possible to reciprocate and slide in the direction of the arrow a in FIG. 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 7 near the back surface of the platen 3 is connected to the tip of the cylinder rod 6a. has been done. 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, a mold clamping holding block 10 is fixed to the surface of the platen 3 by mounting bolts 11 near the surface end of the platen 3.
is configured such that it can be positioned via a mold thickness adjustment handle 18 and a lock nut 12 attached to the surface end of the platen 3. That is, a screw is provided on the shaft of the mold thickness adjustment handle 18, and the position of the mold clamping holding block 10 can be adjusted in conjunction with a screw hole provided at the end of the platen 3. The position of the mold clamping holding block 10 can be adjusted, and this lock nut 1
2, the position of the mold clamping holding block 10 is fixed. Furthermore, the other ends of mold clamping links 13 and 14, each of which has one end connected to the end of the sliding arm 5 and the mold clamping holding block 10, are connected to the upper end of the connecting rod 9. There is.

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 mold clamping links 13 and 14 move to a horizontal state, but one end of the mold clamping link 14 is supported by the mold clamping holding block 10 positioned by the mold thickness adjustment handle 18. Therefore, the end of the other mold clamping link 13 moves to the left in FIG. 1, and the mold 1 is moved toward the center of the platen 3 via the sliding arm 5.

At this time, the mold clamping links 13 and 14 press the bottom plate 10a of the mold clamping holding block 10, which has a substantially L-shaped cross section, against the surface of the platen 3, so that the mold clamping holding block 10 can be operated even by unbalanced force. You can prevent it from floating. Further, at this time, the opening angle of the mold clamping links 13 and 14 is approximately 180 degrees, and the greatest mold clamping force is obtained, and the horizontally stretched state is maintained. At the same time, no displacement of the mold clamping holding block 10 in the mold clamping direction occurs.

In this embodiment, the mold clamping holding block 1
0 is the bottom plate 1 having a substantially L-shaped cross section as described above.
0a is the mold clamping link 13,1 together with the stopper 15.
It also has a function to set the maximum opening angle of 4.

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 platen 3 if necessary. Thereafter, the injection nozzle of the injection unit advances into the forward and backward movement space 2 of the injection nozzle, and injection molding is 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.

FIG. 2 shows a specific example of a stopper that regulates the maximum opening angle of the mold clamping links 13 and 14 and presses the bottom plate 10a of the mold clamping holding block 10, which has a substantially L-shaped cross section, against the platen 3 in the first embodiment described above. This is an enlarged example.

In other words, when the mold clamping is completed, the mold clamping links 13 and 14
is pulled downward by the connecting rod 9 (not shown), so that its opening angle becomes approximately 180 degrees, and the bottom plate 10a of the mold clamping holding block 10 is pressed against the surface of the platen 3 via the stopper 15. Therefore, a force acts in a direction to prevent the mold clamping holding block 10 from lifting up due to the moment during mold clamping.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, a bolt-shaped stopper 16 is attached to a mold clamping link 13', and the tip of this bolt-shaped stopper 16 is held for mold clamping. The mold clamping link 13 is brought into contact with the upper surface of the bottom plate 10a of the block 10.
', 14 have an opening angle of approximately 180 degrees, and press the mold clamping holding block 10.

Furthermore, FIG. 4 shows a third embodiment of the present invention. In this embodiment, a link-shaped stopper 17 is attached to a connecting rod 9' connected to a crank 8 (not shown), and this link-shaped stopper 17 is attached during mold clamping. The stopper 17 is brought into contact with the upper surface of the bottom plate 10a of the mold clamping holding block 10, so that the maximum opening angle of the mold clamping links 13 and 14 is approximately 180 degrees.

In addition, in the embodiments of FIGS. 3 and 4,
It goes without saying that the opening angles of the mold clamping links 13, 13', and 14 can be freely adjusted by adjusting the forward and backward positions of the bolt-shaped stopper 16 and the thickness of the link-shaped stopper 17.

(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 and a mold clamping cylinder is disposed on the other side, the mold clamping device is configured. a stopper that connects the mold clamping link of the mold clamping holding block and presses the bottom plate of the mold clamping holding block against one surface of the platen via the mold clamping link driven by the mold clamping cylinder;
By setting the maximum opening angle of the mold clamping link so that the opening angle is approximately 180 degrees, the mold clamping holding block is pressed against one surface of the platen continuously during the mold clamping operation. Therefore, there is no drawback that the mold clamping holding block is lifted up or misaligned due to the moment caused by the mold clamping force, and the advantage is that the mold clamping holding block does not need to have a highly rigid structure and the structure can be simplified. There is.

In addition, since the mold clamping section and the mold clamping cylinder are arranged on opposite sides of the platen, there is no need to worry about the equipment becoming larger due to the larger size of the safety cover, etc., and a compact injection molding equipment can be provided. effective.

In addition, since no mold clamping cylinder is provided on the transport side of the mold or molded product, it has the effect of contributing to improved workability.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention. FIG. 1A is a plan view of the main part, FIG. 3 and 4 are sectional views of main parts showing second and third embodiments of the present invention, respectively. 3...Platen, 6,6'...mold clamping cylinder,
10... Mold clamping holding block, 10a... Bottom plate, 1
3, 13', 14... Mold clamping link, 15... Stopper, 16... Bolt-shaped stopper, 17... Ring-shaped stopper.

Claims (1)

[Claims] 1. In an injection molding apparatus in which a mold clamping device is disposed on one side of a platen and a mold clamping cylinder is disposed on the other surface, a mold clamping link is connected to a mold clamping holding block constituting the mold clamping device, and The maximum opening angle of the mold clamping link is set by a stopper that presses the bottom plate of the mold clamping holding block against one surface of the platen through the mold clamping link driven by the mold clamping cylinder, and the opening angle is approximately 180 degrees. An injection molding device characterized by: