JPH0727150Y2 - Mechanical safety device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is intended to stop the mold clamping operation at a predetermined position when the safety door of the injection molding machine, particularly the mold clamping device, is open. And a device for automatically setting the positioning of the safety device, which is applied to the mechanical safety device of.

(Prior Art) The safety door is provided in order to protect a worker's body from the closing / opening operation of the mold. Normally, when the safety door is open, the movable mold board moves forward ( The door has a mechanical, hydraulic, or electric forward-movement restraint mechanism to prevent it from being closed. An example of a mechanical one of these three restraint mechanisms will be described with reference to the drawings.

2 to 4 show one example of the conventional mechanical safety device, and FIGS. 5, 6 and 7 show a mold clamping device of an injection molding machine and its safety door portion.

First of all, regarding the structure, 1 is a movable mold board,
As shown in FIG. 3, when the stop plate 2 swings and its swing end is lowered, the side surface is
A stopper 6 having a notch that can be moved forward and backward without interfering with the stopper nut 3, the bracket 4, and the nut retainer 5 is provided. When the swinging end of the stop plate 2 is raised, the stopper 6 and the stop plate 2 interfere with each other, and the movable platen 1 cannot advance any further.

The base end of the stop plate 2 is fixed to the swing rod 7 rotatably supported on the front surface of the brackets 4 and 4A fixed to the base in the rotational direction and is supported so as to be movable in the horizontal direction. For example, the swing rod 7 is a hexagonal rod, and a hexagonal hole that fits the hexagonal rod is formed at the base end of the stop plate 2. As shown in FIG. 3, the stop plate 2 is constantly pushed upward by the compression spring 14, and when the safety door 21 is open, the stop plate 2 is opened.
Prevents the stopper 6 from moving forward.

Reference numeral 3 denotes a stopper nut, which is screwed onto a safety rod 8 made of a threaded rod and, when the safety rod 8 is rotated, moves in the axial direction of the rod 8. A nut retainer 5 is fixed to the side surface of the stopper nut 3 to prevent co-rotation due to rotation of the safety rod 8.

The brackets 4 and 4A are fixed to a base 10 and rotatably support the safety rod 8 via a bearing 9. As shown in FIG. 3, the nut retainer 5 is formed with a through hole A sufficient to allow the swing rod 7 to freely rotate, the nut 3 does not rotate together with the safety rod 8, and the axial direction of the safety rod 8 is prevented. Is made movable.
In addition, a bracket 17 having a concave shape is attached to the side surface of the nut retainer 5.
The stop plate 2 is inserted between the bracket 17 and the bracket 17 to form a guide gap for vertically swinging the stop plate 2.

The swing rod 7 is a hexagonal rod that swings by a cam mechanism 22 in conjunction with a safety door 21 as shown in FIGS. 6 and 7, and is rotated by a bearing unit 12 fixed to the end faces of the brackets 4 and 4A. Held possible.

The safety rod 8 is connected to the handle 13 by a key (not shown) or the like, and the nut 3 is moved by rotating the handle 13. Both ends of the rod 8 are supported by brackets 4 so as to be rotatable.

In FIG. 2, 15 is a proximity body and 16 is a proximity switch.

The whole of the injection molding machine is as shown in FIG. 5, in which reference numeral 20 is a fixed mold plate for fixing the fixed mold of the mold, which is paired with the movable mold plate 1. 27 is a fixed mold and 28 is a movable mold, and both molds form a molding die.

A cam mechanism 22 is adopted as a mechanism for swinging the swing rod 7 in conjunction with opening and closing of the safety door 21. This cam mechanism
According to 22, when the safety door 21 is closed, the cam 23 pushes down the rod 24 and rotates the lever 25 in the direction of arrow D.
The lever 25 is fitted in the swing rod 7 with a hexagonal hole to rotate the swing rod 7. On the contrary, if the safety door 21 is opened, the swing rod 7 itself has a rotating force opposite to the arrow D by the compression spring 14 (Fig. 3), and therefore
Raise 24. A support 26 for the safety door 21 supports a sliding portion when the safety door is opened and closed, and also serves as a guide portion when the rod 24 is moved up and down.

By the way, the above-mentioned safety device can be used for the movable platen 1 by exchanging molds.
When the setting position of (1) changes, it becomes necessary to reset the position of the stop plate 2 accordingly. That is, when the setting position of the movable die plate 1 is changed, the handle 13 is manually rotated to integrally move the stopper nut 3, the nut retainer 5, the stop plate 2, the compression spring 14 and the proximity body 15. , Set the position of the stop plate 2 to a predetermined position. At this time, if the handle 13 is manually rotated,
Stop plate 2, nut 3, compression spring 14 and proximity body
The rotation direction of the nut 15 is restricted by the nut retainer 5, and is moved back and forth in parallel with the moving direction of the movable mold plate 1 by the screw action of the nut 3.

Next, when the proximity switch 16 is pushed by the proximity body 15, this is displayed by a lamp or the like, and the setting of the stop plate 2 to the predetermined position is completed.

(Problems to be solved by the invention) In the conventional stop position setting of the movable mold plate as described above, there were the following problems.

(1) In that setting, since the handle 13 was turned by hand, human labor was required.

(2) In addition, automation cannot be achieved with other work.

The present invention is intended to solve such a problem and to achieve full automation without requiring manpower.

(Means for Solving the Problem) Therefore, according to the present invention, the baffle member connected to the molding machine body and movable in parallel with the movable mold plate is rotatable on the base in parallel with the movable mold plate. A stopper that moves with the rotation of the safety rods supported at both ends so that it does not move, and moves integrally with the movable mold board by the action of the cam attached to the safety door of the mold clamping device when the safety door is open. It is a mechanical safety device of the injection molding machine that advances to a position that interferes with the movement of the movable mold platen and closes the movement in the closing direction. The safety rod is rotated in response to a command from a vessel, and a drive device for automatically moving the baffle member to a predetermined position for sealing the movement of the movable die plate is provided. To do.

(Operation) The position of the movable platen is automatically read by the position detector, and a command is given to the driving device. As a result, the drive device operates to rotate the safety rod, the obstruction member automatically moves to a position where it interferes with the stopper that moves integrally with the movable mold plate, and when the movable mold plate has the safety door open. Do not close automatically. Since the safety rod is supported at both ends, it can be thin and short, which can reduce the cost and can set the stop position of the movable die plate to a predetermined position without any human labor. Also, since everything is automated, it is possible to achieve automation with other work.

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

FIG. 1 shows a typical embodiment of the present invention. In the figure, the parts substantially corresponding to those of the conventional device shown in FIG. 2 are designated by the same reference numerals, and therefore the description of the same reference numerals is omitted.

Hereinafter, the difference from the prior art will be mainly described.

Reference numeral 18 denotes a drive device such as an electric motor with a speed reducer or a servomotor, which replaces the conventional handle 13 and is fixed to the base 10 to rotate the safety rod 8. 19 is a stroke sensor that measures the distance between the movable mold plate 1 and the fixed plate 20,
It is also possible to use the injection molding machine that is used for another purpose.

That is, in this embodiment, the drive device 18 is adopted instead of the handle 13 in the conventional device (FIG. 2), and the stroke sensor 19 is additionally provided.

In the above configuration, when the set position of the movable mold platen 1 is changed now, the position of the movable mold platen 1 is automatically read by the stroke sensor 19 and compared with the position of the movable mold platen 1 up to that time, which is not shown. A normal rotation or reverse rotation command is output to the drive device 18 via the control device of the molding machine, and the drive device 18 is rotated normally or reversely.

When the drive device 18 rotates normally or reversely, the nut 3, the nut retainer 5, the stop plate 2, the compression spring 14, and the proximity body 15 move back and forth in parallel with the movable mold plate 1.

Then, when the proximity switch 16 is activated by the proximity body 15,
The drive of the drive device 18 is stopped by the control device of the molding machine (not shown), and the position setting of the stop plate 2 to a predetermined position is completed.

(Effects of the Invention) According to the present invention as described in detail above, since the safety rod is supported at both ends, the safety rod can be thin and short, which can reduce the cost and requires no human labor. Instead, the stop position of the movable die plate can be set to a predetermined position, and since everything is automated, automation can be achieved even with other work.

[Brief description of drawings]

FIG. 1 is a perspective view of a mechanical safety device for an injection molding machine according to a typical embodiment of the present invention, FIG. 2 is a perspective view showing the conventional mechanical safety device, and FIG. B view, FIG. 4 shows I
-I sectional view, FIG. 5 is a front view of the injection molding machine, FIG. 6 shows a structure of a conventional mold clamping device and a safety door, and a sectional view of FIG.
FIG. 7 is a view corresponding to C in FIG. Description of main parts of the figure 1 ... Movable platen, 2 ... Stop plate, 3 ... Stopper nut, 6 ... Stopper, 16 ... Proximity switch, 18
...... Drive device, 19 …… Stroke sensor

Claims (1)

[Scope of utility model registration request] 1. A safety member having a baffle member connected to a molding machine main body and movable in parallel with a movable mold plate, whose both ends are supported so as to be rotatable but not movable on a base parallel to the movable mold platen. While moving by the rotation of the rod, when the safety door of the mold clamping device is in the open state, the action of the cam attached to the safety door advances to a position where it interferes with the stopper that moves integrally with the movable mold platen A mechanical safety device of an injection molding machine that seals the movement of the board in the closing direction.It rotates the safety rod according to a command from the position detector that automatically reads the position change of the movable mold board. A mechanical safety device for an injection molding machine, comprising a drive device for automatically moving the baffle member to a predetermined position for sealing the movement of the movable mold plate.