JPS6140502Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a mold thickness adjustment device in an injection molding machine that facilitates engagement and disengagement between a ram in a cylinder, a mold thickness adjustment spacer, and an ejector box connected to a movable mold platen. It is something.

The mold clamping device of an injection molding machine equipped with a conventional mold thickness adjustment device will be explained with reference to FIGS. The movable mold platen 3 is moved in the direction of the fixed mold platen 1 in order to obtain the molded product 5, and the mold 2,
4 is closed and a clamping force is applied to the closed mold 2,
Inject the resin into 4. Next, the movable mold platen 3 is moved in the opposite direction, the molds 2 and 4 are opened, and the molded product 5 is taken out.

A cylinder 7 is connected to the fixed mold board 1 by a tie bar 6, and the movable mold board 3 is guided by the tie bar 6 and is movable in between. A ram 8 within the cylinder 7 is connected to the movable mold platen 3 via a mold thickness adjusting spacer 9 and an ejector box 10, and fluid pressure is applied to the ram 8 to generate a clamping force. Reference numeral 11 denotes a plurality of bolts (eight in the drawing), which are screwed onto the ram 8 to tighten the ram 8, mold thickness adjustment spacer 9, and ejector box 10 together. In this case, the ram 8 and ejector box 10 can be directly connected without the mold thickness adjusting spacer 9. In the figure, 12 is a booster ram, 13 is a brake fill valve, and 14 is a tank.

However, the conventional mold clamping device has the following drawbacks. That is, when attaching and detaching the mold thickness adjusting spacer 9, for example, when using a mold with a thinner mold thickness l in place of the molds 2 and 4 in FIG. It is necessary to replace the mold thickness adjusting spacer with a mold thickness adjusting spacer that is thicker by 1, but as shown in FIG.
1, the installation of the same bolt 11,
The drawback was that it took a lot of time to remove.

In order to eliminate the above-mentioned conventional drawbacks, an adjusting device shown in FIGS. 3 and 4 has been proposed. In Figures 3 and 4, 3 is a movable mold plate, 4 is a mold, and 8
1 is a ram, 9 is a mold thickness adjusting spacer, and 10 is an ejector box, which are the same as the apparatus shown in FIG.

A flange 15 is integrally fixed to the end of the ram 8 on the mold thickness adjustment spacer side, into which a bolt 16 is inserted together with the ejector box 10 and the mold thickness adjustment spacer 9, and the bolt has an opening 15b on the outside. A plurality of grooves 15a (four in the embodiment) are provided. Further, bolts 16 are inserted into the ejector box 10 and the mold thickness adjustment spacer 9, respectively, and bolt grooves 10a and 9a having outward openings 10b and 9b are provided in the same phase as the bolt groove 15a, respectively. . 17 is the flange 15
This is a nut that tightens the bolt 16 attached to the side.

In the conventional apparatus shown in FIGS. 3 and 4, when replacing the mold thickness adjusting spacer 9 with a spacer of a different thickness, the nut 17 is loosened and the bolt 16
and the nut 17 are integrated into the bolt grooves 10a, 9.
a, 15a to the respective openings 10b, 9b, 15
Take out the bolt and nut outward as shown by arrow X in Figure 4 through b.

When installing the mold thickness adjusting spacer newly inserted between the flange 15 and the ejector box 10 of the next predetermined thickness, insert the integral bolt 16 and nut 17 into the respective openings from the direction opposite to the arrow X. 10
b, 9b, 15b to bolt grooves 10a, 9a,
15a and tighten the nut 17 to complete the replacement of the spacer.

However, in the adjusting device shown in Figs. 3 and 4, the length of the bolt increases depending on the thickness of the mold thickness adjusting spacer, so in the case of a thick mold thickness adjusting spacer, the bolt is heavy and difficult to work manually. .

Mold thickness adjustment by interposing a mold thickness adjustment spacer between the ram in the cylinder of an injection molding machine and the ejector box connected to the movable mold platen, or tightening them together with bolts and nuts without intervening a mold thickness adjustment spacer. In the apparatus, flanges are provided on the ejector box side of the ram, on the ram side and ejector box side of the mold thickness adjustment spacer, and on the ram side of the ejector box, and each flange is provided with a plurality of same-phase Bolt grooves are provided, and openings extending to the periphery of the flange are formed in each bolt groove, and when the mold thickness adjusting spacer is interposed between the ram and the ejector box, and when it is not interposed, It is characterized in that the bolts and nuts can be inserted into and removed from the bolt groove from the outside through the opening for each pair of flanges, and its purpose is to improve the problems of the conventional method with an extremely simple structure. It is an object of the present invention to provide a mold thickness adjustment device for an injection molding machine.

As described above, the present invention has a plurality of openings extending to the periphery of the flanges attached to the ram, the flanges provided on the ejector box, and the flanges provided on both outsides of the mold thickness adjustment spacer that is removably attached between them. Since bolt grooves having the same phase are provided, bolt nuts for engaging and disengaging the ram, the mold thickness adjusting spacer, and the ejector box, respectively, can be inserted and removed from the outside of the flange when adjusting the mold thickness. Therefore, with the present invention, there are no problems seen in the past, and the mold thickness can be adjusted very easily and quickly, and the working efficiency of injection molding machines, presses, die casting machines, etc. can be improved.

The invention will now be described with reference to the most preferred illustrated embodiment.

In Figures 5 and 6, 3 is a movable mold plate, 4
1 is a mold, 8 is a ram, and 10 is an ejector box, which are the same as the conventional example shown in FIG.

10a is flange 1 of ejector box 10
The bolt groove provided at 0F, 10b is the same bolt groove 1.
These are openings that open outward from Oa to the periphery of the flange, and in this embodiment, two openings are provided on both the upper and lower edges of the flange 10F.

15 is a flange attached to the ejector box 10 side of the ram 8;
A bolt groove 15a and an opening 15b similar to the side flange 10F are provided.

A mold thickness adjusting spacer 20 is removably interposed between the ram 8 and the ejector box 10. The thickness of this spacer 20 can be changed as appropriate, and as shown in FIG. Sometimes it is removed and used. That is, when separating the movable mold platen 3 to which a predetermined mold 4 is attached from the ram 8, first tighten the nut 17.
After slightly loosening the nut 17 from the bolt 16, remove the opening 15 from the bolt grooves 15a and 10a while keeping the bolt 16 and nut 17 together.
b, 10b to the outside in the direction of arrow Y in FIG. 6 to disconnect the ram 8 and ejector box 10. Conversely, when connecting the movable platen 3 to the ram 8, after aligning the flange 15 and the flange 10F of the ejector box 10, tighten the bolts 16 and nuts 1.
7 and inserted into the openings 15b, 10b between the bolt grooves 15a, 10a and tightening the nut 17, the two can be tightened. 2
0F, 20L are flanges attached to both sides of the spacer 20, 20Fb, 20Lb are bolt grooves 20
This is an opening that opens outward from Fa, 20La.

In this embodiment, when removing the mold thickness adjustment inner spacer 20, first slightly loosen each nut 17, and then tighten the opening 2 while integrally with the bolt 16.
It is taken out from the bolt grooves 20Fa, 20La, 15a, 10a via 0Fb, 20Lb, 15b, 10b in the direction of the arrow Y in FIG.

After taking out the bolt and nut as one unit in this way, use the prescribed operating procedure to remove the mold thickness adjustment spacer 2.
Remove 0.

When assembling this mold thickness adjustment spacer 20, contrary to the above-mentioned operation, the bolt grooves 20Fa, 20La, 15
a, 10a and then tightening the nut 17, flanges 15 and 20L, 20F and 10F are connected by bolts 16 and nuts 17, and ram 8, mold thickness adjustment spacer 20 and ejector box 10 are connected.

This embodiment has openings 20Fb, 20Lb, 15b, which open to the outer peripheral edge of each flange described above.
Bolt grooves 20Fa, 20La, 15 through 10b
Since the bolts 16 and nuts 17 can be inserted and removed as one unit inside a and 10a, and each set of flanges is fastened with bolts and nuts, the length of the bolts is short and the weight is light. Efficiency can be improved.

Note that in each of the above embodiments, the openings 10b, 1
5b, 20Fb, and 20Lb are all opened in the vertical direction as shown in FIG. 6, but the same function can be performed even if the opening direction is not necessarily in the vertical direction but in the horizontal or diagonal direction.

[Brief explanation of drawings]

Figure 1 is a side sectional view showing an example of an injection molding machine equipped with a conventional mold thickness adjustment device, and Figure 2 is a side sectional view of an example of an injection molding machine equipped with a conventional mold thickness adjustment device.
3 is a partially cutaway side view of another conventional mold thickness adjusting device, FIG. 4 is a sectional view taken along line - in FIG. 3, and FIG. 5 is a cross-sectional view of the present invention. FIG. 6 is a partially cutaway side view of one embodiment, and FIG. 6 is a cross-sectional view taken along the - line in FIG. , FIG. 7 is a partially cutaway side view showing the case where the mold thickness adjusting spacer is removed and used. 3: Movable mold board, 4: Mold, 6: Ram, 10: Ejector box, 10a, 15a, 20Fa,
20La: bolt groove, 10F, 15: flange,
20: Mold thickness adjustment spacer, 20F, 20L: Flange, 10b, 15b, 20Fb, 20Lb: Opening.

Claims (1)

[Scope of utility model registration request] Mold thickness adjustment by interposing a mold thickness adjustment spacer between the ram in the cylinder of an injection molding machine and the ejector box connected to the movable mold platen, or tightening them together with bolts and nuts without intervening a mold thickness adjustment spacer. In the apparatus, flanges are provided on the ejector box side of the ram, on the ram side and ejector box side of the mold thickness adjustment spacer, and on the ram side of the ejector box, and each flange is provided with a plurality of same-phase Bolt grooves are provided, and openings extending to the periphery of the flange are formed in each bolt groove, and when the mold thickness adjusting spacer is interposed between the ram and the ejector box, and when it is not interposed, A mold thickness adjusting device for an injection molding machine, characterized in that the bolts and nuts can be inserted into and removed from the bolt grooves from the outside through the openings for each pair of flanges.