JPH0423620Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a safety device for a mold clamping device used in an injection molding machine, a die casting machine, etc.

[Conventional technology]

Figure 4 shows a direct pressure type mold clamping device for a normal injection molding machine. Equipped with board 4,
The movable platen 4 is a mold clamping cylinder 5 provided on the fixed platen 2.
It has a structure in which the mold 7 is clamped between the mold 7 and the fixed platen 3.

A safety door 8 is movably provided on the side of the mold clamping device, and a safety device that operates in conjunction with the movement of the safety door 8 is provided.

Generally, a safety device is provided between either the fixed platen 2 or 3 and the movable platen 4, but in the illustrated example, as shown in Figs. 5 and 6, the safety device is installed between the fixed platen 2 on the mold clamping side and A safety rod 9 is provided across the platen 4, and the safety rod 9 attached to the movable platen 4 is inserted into a stopper block 10 protruding from the fixed platen 2, and is pivoted to the stopper block 10 with a pin 13 so as to be movable up and down. The stopper member 11 is made to face the safety rod 9.

This stopper member 11 is removed from the step 9a of the safety bar 9 by a cam member 12 provided inside the rear part of the safety door 8, and when the safety door 8 is opened and the cam member 12 is removed, the safety bar is removed. 9 and engages with the stepped portion 9a to fix the safety rod 9 to the fixed platen 2, and when the safety door 8 is open, the movable platen 4 moves forward in the direction of the fixed platen 3 and the mold 7 from closing.

[Problem that the invention attempts to solve]

In the conventional device described above, it is necessary to adjust the position of the safety rod relative to the fixed plate every time the mold is replaced so that when the safety door is released at the mold opening stop position, the stopper member engages with the stepped part of the safety rod. be.

FIG. 7 Each figure shows the stepped portion 9a of the safety rod 9 and the stopper member 1 when the movable platen position is different when opening the mold.
1. In the states shown in Figures A and D, the step portion 9a and the stopper member 11 are engaged, but in the states shown in Figures B and C, the stopper member 11 may fly off or hit unevenly. It is often difficult to engage reliably and loses its function as a safety device.

For this reason, the position of the safety rod is adjusted as described above, but this not only complicates and lengthens the manual mold replacement work, but also
In particular, this is one of the obstacles to automatic mold replacement, which has become popular recently. things are being done.

Therefore, some attempts have been made to automatically adjust the position of the safety rod using a drive device, but this has resulted in problems such as the device becoming complicated and increasing cost.

This invention was made in view of the above circumstances, and the purpose is to provide a new mold clamping safety device that is simple in structure, reliable in operation, and does not require any adjustment work when replacing molds. That is.

[Means for solving problems]

This invention for the above purpose consists of forming the stopper member from a plurality of plates having a required thickness, and arranging the stopper member so that at least one of the plates faces the safety bar so as to engage with the stepped portion. Therefore, the above-mentioned conventional problems are solved.

[Effect]

In the above configuration, in the mold opening position, at least one of the plurality of stopper plates is
The plate engages with one of the steps regardless of the position of the safety bar, thereby restricting the forward movement of the movable platen when the safety door is opened.

〔Example〕

1 to 3 show an embodiment of this invention, and the same parts as in the conventional device are designated by the same reference numerals.

The difference between this embodiment and the conventional device shown in FIGS. 4 to 7 is that in this embodiment, the stopper member 1
1 is a plurality of stopper plates 11 having the required thickness
a, 11b, and 11c.

Each of the above stopper plates 11a, 11b, 1
1c is pivotally mounted with a pin 13 in a stopper block 10 protruding from the upper corner of the fixed platen 2 so as to be movable up and down, and a cam member 12 provided on the inner rear side of the safety door 8 is positioned on the outer end. When pressed, the inner ends of the stopper plates 11a, 11b, and 11c move upward using the pin 13 as a fulcrum and separate from the safety rod 9.

In addition, each stopper plate 11a, 11b, 1
The thickness of the safety bar 1c varies depending on the dimension between the stepped portions of the safety rod 9 or the number of safety rods, but it needs to be thick enough for at least one of the three safety rods to engage with the stepped portion 9a.

In the embodiment shown in FIG. 1, one of three stopper plates 11a, 11b, and 11c is always engaged with a stepped portion 9a formed at a distance at the front end of a conical joint. In this case, when the stopper member 11 is placed facing a recess in one section of the safety rod 9, even if the position of the safety rod 9 changes,
As shown in FIGS. 2A to 2D, one of the stopper plates 11a, 11b, and 11c engages with the stepped portion. Also, the movable platen 4
moves forward, but the distance it advances is extremely small and not dangerous.

Further, in the example shown in FIG. 3, the stopper member 11 has two stopper plates 11a and 11b.
In this case, the stopper plates 11a and 11b should face the safety rod 9 with a required distance between them.

Although the above embodiment is applied to a direct pressure type mold clamping device, this invention is not particularly limited to a direct pressure type mold clamping device since it can also be applied to a toggle type mold clamping device.

[Effect of idea]

As mentioned above, this invention forms the stopper member with a plurality of stopper plates of a required thickness, so that one stopper plate always engages with the step regardless of the position of the safety rod. With this structure, there is no need to adjust the position of the safety rod every time the mold is replaced. Therefore, not only the time required for mold replacement work can be shortened, but also labor can be saved, which can also be useful for improving productivity. Further, since there is no change in the structure other than the stopper member from the conventional device, there is no particular increase in cost, and the structure is simple and highly reliable in terms of safety, which is extremely beneficial.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of this invention, with Figure 1 being a plan view of the main parts, Figure 2 each figure, and Figure 3
Each figure is an explanatory diagram of the engagement relationship, Fig. 4 is a perspective view of a general mold clamping device, Fig. 5 is a plan view of the main part of a conventional safety device, Fig. 6 is a vertical sectional view thereof, and Fig. 7 is an engagement relationship explanatory diagram. 2...Fixed plate, 4...Movable plate, 8...Safety door, 9...Stopper member, 9a...Step part, 10
Stopper block, 11...stopper member,
11a, 11b, 11c... stopper plate, 12... cam member, 13 pin.

Claims (1)

[Scope of utility model registration request] A stopper block on the fixed platen side having a through hole, and a safety rod that has a large number of continuous steps around the outer periphery at regular intervals and is attached to the movable platen side so as to be able to be inserted into the stopper block. and a stopper member that engages with the stepped portion of the safety rod that is pivoted to the stopper block so as to be movable up and down; In a safety device comprising a cam member that releases the engagement between the stopper member and the safety bar when the stopper member is closed, the stopper member is composed of a plurality of plates having a required thickness, and at least one of the plates is A safety device for a mold clamping device, which is provided facing the safety rod to engage with the stepped portion.