JPH04166318A - Injection molding machine - Google Patents

Abstract

PURPOSE:To secure safety at the time of opening of a door even if the title machine is of a type where a safety door is opened or closed vertically, by a method wherein the safety door of a mold clamping device is fitted vertically openably and closably to a support frame of the upper part of the mold clamping device by hinging the safety door to the support frame and a member pressing a stopper against the inside of the safety door is provided in a projected state. CONSTITUTION:A safety door 8 is constituted so that the upper end fringe of the same is fitted to a support frame 9 built laterally to the upper part of a mold clamping device and the same can be opened or closed vertically. A pressing member 14 of a stopper 6 is provided on the inside of a door part of the safety door 8 in a projected state. Under a state where the safety door 8 is closed, the pressing member 14 presses the tip part which is formed in an inclined state by the stopper 6. With this construction, the stopper 6 is turned around a support shaft 7 as a fulcrum, the rear end part which has been clogged a receiving hole 5 is sprung up, the same is opened and insertion of a safety bar 3 is allowed. Then under a state where the safety door 8 is opened upward, since the pressing member 14 is separated from the stopper 6, the stopper 6 is released, restored to the original state by an empty weight, the rear end part cloggs again the receiving hole 5 and receives the safety bar 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an injection molding machine in which a safety door of a molding operation section can be opened and closed up and down.

[Prior art] In conventional horizontal injection molding machines, the safety door of the molding operation section is installed to open and close from side to side. When the safety door is opened after the mold opening operation of the mold clamping device, the fixed plate and the movable plate are separated. The mold clamping device will not close unless the safety device installed throughout the mold is activated and the safety door is closed again.

As the above-mentioned safety device, a mechanical device using a safety rod is widely adopted because of its simple structure.

This mechanical safety device is equipped with a safety rod that protrudes toward the fixed platen on the movable platen of the mold clamping device, and a stopper that opens and closes the receiving hole of the safety rod is mounted on a shaft that can freely move up and down. is installed on a fixed plate.

When the safety door is closed, the tip of the stopper is pushed downward by the cam plate installed at the upper corner of the safety door, and the rear end, which was blocking the opening, jumps up using the shaft as a fulcrum and is received. Open the hole to allow insertion of the safety rod.

Furthermore, if the safety door is pulled sideways after the mold has been opened, the cam plate will come off the tip of the stopper, and the stopper will return to its original state under its own weight.

Since the safety rod in the receiving hole has already been pulled out when the mold is opened, the rear end of the stopper blocks the receiving hole again, preventing insertion of the safety rod and preventing the mold from being closed.

[Problems to be Solved by the Invention] In order to prevent danger to workers, silence the molding machine, and prevent dust, an increasing number of injection molding machines have an injection device and a mold clamping device covered with a cover.

When installing a horizontally opening safety door, which has been used up to now, to such an injection molding machine, it is necessary to provide a guide for the safety door on the outside of the cover.

Since this guide is provided from the operating section of the mold clamping device to the vicinity of the stationary platen that holds the mold clamping cylinder, it becomes an obstacle to attaching and detaching the cover of that part, making maintenance difficult.

One way to solve this problem with side-opening safety gates is to
It is conceivable to open and close the safety door vertically, but in this case, it is necessary to ensure safety by some means when the door is opened.

This invention was conceived in view of the above circumstances, and its purpose is to enable the safety door to be opened and closed freely up and down, and to ensure safety when the safety door is opened by using conventional safety devices as is. The purpose of the present invention is to provide an injection molding machine that can be used and secured.

[Means for Solving the Problems] The feature of the present invention according to the above object is that a safety rod is provided on the movable platen of the mold clamping device so as to protrude toward the fixed platen side, and a stopper/perture for opening and closing the receiving hole of the safety rod is provided. A safety block with a shaft that can move up and down is installed on a fixed platen, and the safety door of the mold clamping device is hinged to the support frame at the top of the mold clamping device so that it can be opened and closed up and down. A member is provided in a protruding manner to open the receiving hole by pressing the stopper.

[Operation] In the above configuration, when the safety door is closed around the hinge part,
A pressing member protruding from the inside of the safety door pushes the tip of the stopper downward, causing the stopper to rotate and the rear end to flip up and open the receiving hole of the safety block.

Further, when the safety door is opened upward, the pressing member is separated from the stopper, the stopper rotates back to its original position, and the rear end closes the receiving hole of the safety block, thereby stopping the safety rod from receiving.

[Embodiment] In the figure, 1 is a fixed plate of a mold clamping device, 2 is a movable plate, and 3 is a safety bar, which is provided above the movable plate 2 so as to protrude horizontally toward the fixed plate.

4 is a safety pro that is fixedly installed on the fixed plate 1.

In this case, the receiving hole 5 for the safety rod 3 is provided horizontally,
In addition, in the horizontal groove provided in the middle of the receiving hole 5, there is a stopper 6 having a required thickness, the top of which is cut out diagonally. It is provided with a shaft 7.

Reference numeral 8 denotes a safety door provided in the operating section on the side of the mold clamping device, and its upper edge is attached to a support frame 9 horizontally suspended above the mold clamping device with a hinge 10 so that it can be opened and closed vertically. To keep the safety door 8 open, use the covers 1 on both sides of the safety door 8 and the operating section.
This can be done by a gas damper 13 provided in place of the frame 12 of 1.

A pressing member 14 of the stopper 6 is protruded from the inside of the door portion of the safety door 8. When the safety door 8 is closed, the pressing member 14 presses the inclined tip of the stopper 6, as shown in FIG. As a result, the stopper 6 rotates about the support shaft 7, and the rear end portion that was blocking the receiving hole 5 jumps up, opening the receiving hole 5 and allowing the safety rod 3 to be inserted.

Furthermore, when the safety door 8 is opened upward, the pressing member 14 is separated from the stopper 6, so as shown in FIGS.
As shown in the figure, the stopper 8 is released and returns to its original state due to its own weight, and the rear end closes the receiving hole 5 again and the safety rod 3
I started to stop receiving it.

Note that the safety gate in this invention can be similarly provided on the opposite side of the operating section, so it is not limited to only the operating side.

[Effects of the Invention] As described above, the present invention provides a safety rod 3 on the movable platen 2 of the mold clamping device so as to protrude toward the fixed platen side, and a stopper 6 for opening and closing the receiving hole of the safety rod 3 to be moved up and down. A freely axially mounted safety block 8 is provided on the fixed platen 1, and the safety door 8 of the mold clamping device is hinged to the support frame 9 at the top of the mold clamping device so that it can be opened and closed vertically. Since the member 14 that opens the receiving hole by pressing the stopper 6 is protruding from the inside of the safety door, even when the safety door is opened and closed vertically, the same effect when opening the safety door as when opening horizontally. Safety can be ensured, and conventional safety devices can be used as is.

Also, since there is no need for opening space for the safety door on the side of the molding machine, there is no need to provide a guide for opening and closing on the outside of the cover (and there is no need for an open safety door to interfere with maintenance of the mold clamping device). It has advantages such as:

[Brief explanation of drawings]

The drawings show one embodiment of the injection molding machine according to the present invention. Fig. 1 is a longitudinal sectional front view of the main part on the fixed plate side when the door is closed, and Fig. 2 is a longitudinal sectional view of the main part on the fixed plate side when the door is open. FIG. 3 is a front view, FIG. 3 is a side view when the door is opened, and FIG. 4 is a perspective view of the injection molding machine completely covered with a cover. 1...Fixed plate 2...
・・Movable plate 3・・・Safety rod 4′・
......Safety book 5...Insertion hole 6...Stopper 7...
......Spindle 8...Safety door 9...Support frame 10...
...Hinge 11...Cover 12...
...... Frame 13 ... Gas damper 14 ... Pressing member patent applicant Nissei Jushi Kogyo Co., Ltd. Figure 1

Claims (1)

[Claims] A safety block is provided on the movable platen of the mold clamping device with a safety rod protruding toward the fixed platen side, and a stopper for opening and closing the receiving hole of the safety rod is installed on the fixed platen so as to be movable up and down. The safety door of the device is hinged to the support frame at the top of the mold clamping device so that it can be opened and closed up and down, and a member is provided protruding inside the safety door to open the receiving hole by pressing the stopper. An injection molding machine featuring: