JPS6255466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forming mold in a mold making machine in which a lower mold assembly is replaced by moving it laterally using wheels, and particularly to a forced return device for a connecting plate for a core extrusion pin.

In conventional mold making machines, the attachment mechanism for connecting plates with extrusion pins is to use bolts and nuts to attach the connecting plate to the push-up plate, or to attach a hook to a rotating shaft operated from outside the clamp table. The connecting plate is attached to the push-up plate by opening and closing, but since the connecting plate with ejector pin is a member combined with the mold, when replacing the mold, the connection plate and the push-up cylinder are operated. The mold must be removed after disconnecting from the lifting plate that moves up and down. Therefore, since the mold replacement work is carried out in a narrow space, the mold replacement work is time-consuming and dangerous in the conventional method as described above.

In order to eliminate the drawbacks of the conventional method, the present applicant has a lever shaft that rotates in conjunction with the rotation of the lower mold chuck driven by the lower mold chuck cylinder, and the lever shaft rotates the hook shaft. We previously proposed a forced return mechanism for the connecting plate for the lower mold extrusion pin of a horizontally split mold making machine that rotates the
issue). This invention has the restriction that it must be within a range that can be linked to the rotation of the lower mold chuck driven by the lower mold chuck cylinder.

The present invention is a further improvement of the conventional system and the above-mentioned invention, and the gist of the present invention is as specified in each claim above. This is a simple and reliable forced return device for a connecting plate for an ejector pin, which can be applied to a molding mechanism that does not have an ejector pin.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings showing several specific examples of the present invention.

Figures 1 to 4 show T that works with the rail lifter.
FIG. 3 is a schematic view showing in order the operation of replacing the lower mold assembly of the mechanism of the present invention having a letter-shaped stopper.

FIG. 1 shows the left half of the lower mold assembly during the molding operation of the molding machine, and this lower mold assembly 1 has a connecting plate 2 for an extrusion plate built therein in its lower interior. The connecting plate 2 is locked by a rotatable locking hook 4 built into the crank table 3. That is, FIG. 1 is a schematic cross-sectional view of the molding machine during molding.
In FIG. 1, a push-up plate 5 is raised and lowered by the operation of a push-up plate cylinder 6 to project an ejection pin (not shown) into the lower mold 1. 7 is a cylinder for raising and lowering the clamp table 3, and 8 is a protruding rod having a spring 9. 10 is a T-shaped stopper, has a rail lifter 11, and has a shaft 1.
2 as shown in FIG. 13
are rollers (at least four) provided on both sides of the lower mold assembly, and 14 indicates rails provided on both sides of the clamp table.

FIG. 2 shows the state in which the work to replace the lower mold assembly has started, and the lifting cylinder 7 of the clamp table 3 is moved upward to raise the clamp table 3 that has clamped the lower mold assembly 1. A space necessary for rotation of the T-shaped stopper 10 is provided, and the T-shaped stopper 10 is rotated in the direction of the arrow as shown. Therefore, the rail lifter 11 also stands upright at the position indicated by the two-dot chain line.

FIG. 3 shows a state in which the clamp table lifting cylinder 7 has been lowered and the lower end surface of the projecting rod 8 has come into contact with the T-shaped stopper. Figure 4 shows the lifting cylinder 7.
further descends, and the rail 14 is placed on the rail lifter 11.
furthermore, the roller 13 of the lower mold assembly 1 is placed on the rail 14, and at the same time the protruding rod 8 compresses the spring 9 and protrudes upward, causing the locking hook 4 to open as shown in FIG. Rotate it as you like. That is, the connecting plate 2 is released from the lock by the locking hook 4, and therefore the lower mold assembly 1 is able to move horizontally on the rail 14, and the lower mold assembly 1 is moved to the molding machine. The lower mold assembly can be removed and replaced with the desired lower mold assembly.

FIGS. 5 and 6 show a specific example in which the stopper of the present invention is composed of a link mechanism interlocking with a rail lifter. Note that everything other than the stopper mechanism is the same as in the example shown in FIGS. 1 to 4 described above.

FIG. 5 is a partial sectional view showing the left half of the stopper, which is composed of a link mechanism interlocking with the connecting plate 2, clamp table 3, and rail lifter of the molding machine during the molding operation.

When replacing the mold assembly (not shown), the clamp table 3 is raised by the raising operation of the cylinder 7, as shown in FIG. However, in this example, the clamp table 3 may be raised to such an extent that the lower end surface of the rail 14 provided on the side surface of the clamp table 3 is slightly above the upper end surface on which the rail lifter 11 stands upright. When the rail lifter 11 is raised upright manually or by power, the stopper pin 15 connected via the lever 16 is inserted into the insertion hole 17 to a predetermined position.

Then, when the clamp table 3 is lowered,
At the same time as the rail 14 contacts the upper end surface of the rail lifter 11, the lower end surface of the projecting rod 8 contacts the stopper pin 15 and projects upward against the elasticity of the spring 9, thereby locking the locking hook 4 as shown in FIG. Rotate as shown. That is, the connecting plate 2 is unlocked by the locking hook 4 in the same way as in the above-described example, and the lower mold assembly is now in a state where it can be moved and taken out from the clamp table, and the lower mold assembly can be replaced. can be easily done.

Since the present invention is constructed as described above, it can achieve the following effects. That is, in the invention previously proposed by the present applicant, the forced return mechanism is set at the same time as the lower mold chuck is operated, but in the present invention, the forced return mechanism is set at the same time as the rail lifter is set. be. Therefore, it can be applied to a molding machine not equipped with a lower mold chuck cylinder. Moreover, since a rail lifter is always installed when replacing the lower mold assembly, a simple mechanism with a stopper that interlocks with the rail lifter has the effect of ensuring accurate forced return operation. be.

[Brief explanation of the drawing]

1 to 4 are schematic diagrams showing in order the manner of replacing the lower mold assembly of the device of the present invention having a T-shaped stopper, and FIGS. It is a schematic diagram showing the operation mode of a stopper having a link mechanism as an example, in which 1 is a lower mold assembly, 2 is a connecting plate, 3 is a clamp table, 4 is a hook for locking the connecting plate, and 5 is a Push-up board, 8 is push-up bar,
9 is a spring, 10 is a T-shaped stopper, 11
is a rail lifter, 13 is a roller, 14 is a rail, 15 is a stopper pin, 16 is a lever, 17
is the insertion hole.

Claims (1)

[Scope of Claims] 1. In a mold making machine in which a lower mold assembly is replaced by moving it laterally using wheels, a plurality of connecting plate locking hooks are rotatably mounted in a lower mold clamp table. The locking hook opening/closing projecting rod equipped with a spring is slidably inserted through the lower part of the clamp table, and the upper end of the projecting rod is attached to the rotating portion of the locking hook. The clamp table is characterized in that a stopper for stopping the ejection rod is provided on both sides of the lower side of the clamp table so as to be rotatable or slidable. Forced return device for connecting plate for mold extrusion pin in mold making machine. 2. A forced return device for a connecting plate for a mold extrusion pin in a mold making machine according to claim 1, wherein the stopper is a T-shaped stopper interlocking with a rail lifter. 3. A device for forcibly returning a connecting plate for a mold extrusion pin in a mold making machine according to claim 1, wherein the stopper is a stopper comprising a link mechanism interlocking with a rail lifter.