JPH0611156Y2 - Mold opening prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical decomposition to which the invention belongs> The present invention relates to a mold opening prevention device for an injection molding machine, a die casting machine, a press (hereinafter referred to as a molding machine).

<Prior art and its drawbacks> In recent years, molds are automatically replaced, and if the mold parting surface is opened due to vibration or the like while the molds are moving in order to replace the molds, the mold molding machine is replaced. There was a risk that it would not be possible to automatically carry in.

Further, when exchanging the mold, the mold 21 currently in use is removed as shown in FIG. 4, and a mold not shown is pulled out from the molding machine in the direction of the arrow a like the mold 23 shown by the chain line. Fixed and movable die plates 24 and 2 by a clamp device
Removed from the die mounting surface of No. 2 and moving the movable die plate 22 back about 10 mm from the position B in the closed state of the die (moving upward in the figure) to provide a gap between the die 21 and the moving die plate 22. After that, the molds have been carried out.

However, the mold is divided into three parts like the fixed mold 26 attached to the fixed die plate 25 and the moving mold 28 attached to the moving die plate 27 as shown in FIG. When the mold is opened after the completion of the molding, the plate 29 and the mold plate 30 are provided, and when the mold is opened, a spring 31 is provided on the mold opening face C before the mold opening face C other than the mold parting face A. After the mold opening surface C is opened by the distance α constrained by the stopper 32, the spring-loaded mold (hereinafter referred to as the spring-containing mold) configured to open the mold parting surface A is carried out of the molding machine. In such a case, even if the moving die plate 27 retreats by about 10 mm (moves to the right in the figure), the die opening surface C is simply opened by the spring 31, and the distance α is the retreat distance of the moving die plate 27. When it is about 0 mm or larger, there is no gap between the moving die plate 27 and the dies 26, 28, and the dies 26, 28 are pressed between the die plates 25 and 27. , The delivery is either forcibly pulled out against the pressing force of the spring 31, or it becomes impossible to carry out as it is.
It was very inconvenient for automatic die change.

<Purpose of the Invention> The present invention eliminates the above-mentioned drawbacks and aims to provide a mold opening prevention device in which the mold opening prevention operates during transportation and the mold does not open. In particular, it is an object of the present invention to provide a mold opening prevention device that enables automatic mold replacement even in a mold with a spring.

<Summary of the Invention> In order to achieve the above-mentioned object, the present invention is capable of swinging left and right around a fulcrum provided on either one of the movable or fixed mold of a movable or fixed mold of an injection molding machine. A hook, one end of which is key-shaped to be hooked to a hooking member such as a groove provided on the other side fixed or moving mold,
A spring that acts between the fulcrum of the hook and the key-shaped portion at one end to constantly lock the key-shaped portion with the locking member, and this clamp when clamping the mold to the mold mounting surface. When the other end of the hook is simultaneously pushed by the action to separate the key-like part at one end of the hook from the hooking member such as the groove against the attractive force of the spring, and the mold is unclamped on the mold mounting surface, This unclamping operation simultaneously separates from the other end of the hook, and a mold clamping device provided with a clamp piece that acts so as to engage the key-like part at one end of the hook with a retaining member such as a groove by the attractive force of the spring. A mold opening prevention device is provided.

<Embodiment> Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 3, where 11 is a fixed die plate and 12 is a fixed mold. Reference numeral 13 is a moving die plate, and 14 is a moving die.

The fixed and movable molds 12 and 14 are in contact with each other at the mold-parting surface A to form a cavity (not shown).
The clamp pieces 33 of the molds 15 and 16 are the molds 12 and 14
Is a mold clamping device that controls the engagement and disengagement of a mold opening prevention device, which will be described later, while mounting the mold on the mold mounting surface.

Reference numeral 17 is a hook of a mold opening prevention device, which is supported on the movable mold 14 by a fulcrum 18 so as to be swingable left and right. One end of the hook 17 has a key shape 20 so as to be hooked in a groove 19 provided in the fixed mold 12 and the other end reaches the vicinity of the clamp piece 33 of the mold clamping device.

Reference numeral 21 denotes a spring, which is provided between the fulcrum 18 of the hook 17 and the middle of the key-shaped portion 20 at one end and the mold 14, and pulls the hook 17 downward so that the key-shaped portion 20 is always hooked in the groove 19. It is working to stop.

In the above description, the hook 17 is provided with the fulcrum 18 on the movable mold 14, but of course, the fulcrum 18 may be provided on the fixed mold 12, in which case the groove 19 as well as the movable mold 14 is provided. Will be provided.

Further, the groove 19 on which the key-shaped portion 20 of the hook 17 is locked is not limited to the groove, and may be a concave hole or the like, and any member that can lock the key-shaped portion 20 may be used.

<Effect> With the configuration described above, during transportation, that is, when the clamp piece of the mold clamping device is not pushing the other end of the hook, the key part of the hook engages with the groove of the mating mold. Since it is stopped, the mold parting surface A does not open.
Further, when the mold is clamped to the die plate by the mold clamp device, the hook is not engaged with the groove of the mating mold and the mold parting surface A can be opened. It is possible, and the drawbacks fried at the beginning are eliminated.

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention, and FIG. 1 is a view showing a state where a die is clamped to a die plate and a hook is not hooked to a mating die. FIG. 2 is a view showing a state where the die is not clamped to the die plate, that is, a state where the hook is hooked on the mating die. Figure 3 is the first
Sectional I-I figure of a figure. FIG. 4 is a view for explaining a method for carrying out a mold from a conventional molding machine, and is a plan view of a mold clamping device of an injection molding machine. FIG. 5 is an explanatory view of a mold with a spring. 11 ... Fixed die plate, 12 ... Fixed mold, 13 ...
... moving die plate, 14 ... moving die, 15,16 ... die clamping device, 17 ... hook, 1
9 ... Groove, 20 ... Key portion, 21 ... Spring, 33 ... Clamp piece.

Claims (1)

[Scope of utility model registration request] 1. A movable or fixed die of an injection molding machine is supported so as to be swingable left and right around a fulcrum provided on one of the movable and fixed dies, and one end is fixed on the opposite side. Alternatively, a hook that is key-shaped for locking with a locking member such as a groove provided in the movable mold, and a key-shaped portion that is between the fulcrum of the hook and the key-shaped portion at one end is always the locking member. When the mold is clamped on the mold mounting surface with a spring acting to lock it on the mold mounting surface, the other end of the hook is simultaneously pressed by this clamping operation to resist the attractive force of the spring and lock the key at one end of the hook. When the mold is unclamped from the hooking member such as a groove and the mold is unclamped on the mold mounting surface, the unclamping operation simultaneously separates from the other end of the hook, and the attraction force of the spring causes the one end of the hook to move. Acts to lock the key-shaped part to a locking member such as a groove Mold opening prevention device comprising a mold clamping device having a clamping piece that.