JPS6213772Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for ensuring the safety of workers when working inside an injection molding machine during mold opening.

For example, if you frequently enter the injection molding machine for mold matching during the trial production stage of a molded product, in order to ensure worker safety, conventional injection molding machines do not allow the movable die plate to move in the mold closing direction due to accidental movement while the mold is open. This movement was prevented, for example, by an electrical interlock.

However, since electrical interlocks themselves have the possibility of malfunction, certain safety cannot be expected in some cases. In addition, since the workers cannot directly visually determine whether or not the electrical interlock is operating normally, they have been unable to eliminate their concerns about safety.

This invention is intended to solve the above problems, and allows workers to visually confirm safety, and even if the movable die plate moves in the mold closing direction due to accidental activation while the mold is open, it stops its movement. The purpose is to provide safety devices for injection molding machines.

In the present invention, the movable die plate separates from the fixed die plate and reaches the backward limit, and the safety gates movably arranged in parallel on the outside of the movable and fixed die plates move away from the forward limit on the fixed die plate side. This safety device for an injection molding machine is characterized in that a stopper that can move forward and backward between spaced apart movable and fixed die plates is attached to the drive means that is activated at times.

An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 and 2 showing the injection molding machine, 1 is a fixed die plate, 2 is a movable die plate, 3 is a mold attached to the fixed die plate 1, and 4 is a die attached to the movable die plate. ,
5 is a diver that guides the moving movable die plate 2. And a safety door 6 with wire mesh
is movably provided parallel to the outside of the die plates 1 and 2 on a stay 7 extending over the upper part of the molding machine. In the illustrated example, 8 is the retraction limit of the movable die plate 2 when the mold is opened, and 9 is the forward movement limit of the safety door 6 when the mold is closed.

The safety device 10 is provided with a rod-shaped stopper 11 having a desired length, which is movable up and down by an air cylinder 12 as a driving means attached to the rod-shaped stopper 11, and when the mold is opened, the stopper 11 is placed facing each other with a sufficient distance. It is constructed so that it is interposed between a fixed die plate 1 and a movable die plate 2 within a sufficiently visible range for those working in the injection molding machine to confirm safety. The air cylinder 12 detects an operation signal and starts operating when the movable die plate 2 separates from the fixed die plate 1 and reaches the backward limit, and the safety door 6 separates from the forward limit 9, and moves the stopper 11 to the die. plates 1, 2
It is inserted in between. Note that the driving means for the stopper 11 is not limited to the air cylinder 12, and various devices having the function of raising and lowering the stopper 11 can be used.

The stopper 11 is guided in the vertical direction by a guide pin 13 attached to the stopper 11 and a guide pin 14 inserted through the guide pin 14 and provided on the stay 7.

It goes without saying that the injection molding machine may be provided with not only the safety device 10 described above but also conventional safety devices such as an electrical interlock.

Next, the operation of the safety device 10 having the above configuration will be explained.

As shown in FIG. 1, when the mold is closed, the safety door 6 is in contact with the forward limit 9, and the stopper 11 is located at an upper position so as not to interfere with the movement of the movable die plate 2.

When the mold is opened, the movable die plate 2 separates from the fixed die plate 1 and retreats from the state shown in FIG. detects the activation signal and releases the rod 12 of the air cylinder 12.
a descends. By lowering the rod 12a, the stopper 11 enters between the stationary die plate 1 and the movable die plate 2, which are spaced apart from each other with a sufficient distance, as shown in FIG.

In this way, if the stopper 11 is interposed between the die plates 1 and 2, even if the movable die plate 2 moves toward the fixed die plate 1 due to unexpected operation, the stopper 11 will stop the movement. Space 1 for workers to enter inside the molding machine
Safety in 5 can be ensured.

As explained above, according to the safety device of the injection molding machine of the present invention, a stopper is interposed between die plates that face each other at a distance when the mold is opened, so that there is no possibility of accidental activation when the mold is opened. Therefore, even if the movable die plate moves in the mold closing direction, the stopper can prevent that movement.
The safety of those who enter the molding machine to work can be ensured.

Further, a person who enters the injection molding machine with the mold open and works therein can visually check whether the stopper is at a predetermined intervening position, making it easy to further confirm safety.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
This figure is a front view showing a state different from that in FIG. 1. 1... Fixed die plate, 2... Movable die plate, 3, 4... Mold, 6... Safety door, 10...
Safety device, 11... Stopper, 12... Air cylinder (driving means).

Claims (1)

[Scope of utility model registration request] Operates when the movable die plate separates from the fixed die plate and reaches the backward limit, and the safety gate movably arranged in parallel on the outside of the movable/fixed die plate separates from the forward limit on the fixed die plate side. A safety device for an injection molding machine, characterized in that a stopper that can advance and limit between spaced apart movable and fixed die plates is attached to the drive means.