JPH072333B2 - Mold opener - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold opening / closing device for resin molding, die casting, press molding and the like.

[0002]

2. Description of the Related Art Large molds used for resin molding, die casting, press molding and the like have a large weight, so that they are opened and closed by using a unloading machine such as a crane and a hydraulic lift device.

Generally, a molding die is composed of an upper die and a lower die, and the upper die is positioned and guided and guided by guide pins provided upright on the lower die. There is.

As a general opening / closing device for the upper mold, a crane installed in a factory or the like was used to lift and move the upper mold.

Alternatively, a dedicated machine for opening and closing the mold has been installed to open and close the mold.

[0006]

However, in the case of using the crane, which is one of the conventional mold opening / closing devices described above, when the hanging point of the crane is displaced from the center of gravity of the upper mold, For various reasons, such as when the die is tilted or the guide pin and the fitting hole do not slide smoothly, it is not possible to maintain a horizontal state when hoisting with a crane. Therefore, the fitting hole of the upper mold and the guide pin cannot be lifted up and the upper mold cannot be lifted up. Conventionally, a hammer or the like is used to open and close the mold while correcting the posture of the upper mold in a horizontal state.

Further, in the case of installing a dedicated mold opening / closing device, there is a problem that the equipment cost becomes high and the device becomes large in size, and the installation space becomes large.

In view of the above situation, the present invention aims to provide a mold opening / closing device which can open and close the mold simply and smoothly.

[0009]

According to the present invention, an elevating post is erected on a pedestal on which a mold is installed and provided on the elevating post .
A slider is slidably mounted on the lifting guide rails to allow horizontal movement.
The upper mold, and the upper mold position is corrected.
A mold retainer is installed on the slider, and
Sprockets are provided at the ends and the lower end, and between the sprockets.
Hang the chain and connect the chain with the slider
And connect it to one of the sprockets to create a fluid pressure motor.
The fluid pressure motor is provided with
The fluid pressure so that it is urged to rotate in the direction of lowering the mold clamp.
It is characterized in that a predetermined fluid pressure is applied to the motor .

[0010]

By pressing the upper die against the die retainer, the posture of the upper die is corrected by the die retainer, and the upper die moves up and down while maintaining the parallel state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

An elevating post 2 is erected on a pedestal 1, an elevating guide rail 3 is provided on the elevating post 2, and a slider 4 is slidably fitted on the elevating guide rail 3. A mold retainer 5 extending horizontally is fixed to the slider 4.

An upper sprocket 6 is rotatably provided at the upper end of the elevating post 2, and a lower sprocket 7 is rotatably provided at the lower end of the elevating post 2. Then, the chain 8 engaged with the slider 4 is hooked around the upper sprocket 6 and the lower sprocket 7, and both ends of the chain 8 are balanced weights 9 on the side of the elevating post 2 opposite to the elevating guide rail 3 side.
Connect to.

Further, an air motor 10 is provided at the upper end of the elevating post 2, and a pinion gear 11 fitted to the output shaft of the air motor 10 and a gear 12 fitted to the rotary shaft of the upper sprocket 6 are meshed with each other.

A seat plate 13 is placed on the pedestal 1, a mold base 14 is provided on the seat plate 13, a lower mold 16 is fixed to the mold base 14, and a lower mold 16 is provided. A guide pin 15 is provided upright on the guide pin 15, and an upper die 17 is slidably fitted to the guide pin 15 via a bush 18 to engage the upper die 17 with the lower die 16.

An eyepiece 19 for transportation is provided on a side surface of the upper mold 17, and a hook 21 at a lower end of a lift chain 20 hanging from a crane or a chain block is engaged with the eyepiece 19.

Reference numeral 22 in the drawing denotes an air pressure source including a compressor, an air pressure tank, etc., and the air pressure source and the air motor 1
0 is connected via a required pneumatic circuit.

The operation will be described below.

FIG. 1 shows a state in which the upper and lower molds are closed. When the mold is opened from this state, the air motor 10 causes the pinion gear 11 and the gear 12 to interpose the upper sprocket 6 into the upper sprocket 6. Is rotated counterclockwise in the figure to orbit the chain 8 to lower the slider 4 and press the die retainer 5 against the upper die 17. Even after the die retainer 5 is pressed against the upper die 17, a required air pressure is supplied to the air motor 10 to generate a predetermined rotational torque, and the die retainer 5 is urged downward.

With the upper die 17 being pressed by the die retainer 5 with a predetermined force, the hook 21 of the lift chain 20 is engaged with the eyepiece 19 to wind up the lift chain 20. When the hoisting force of the lift chain 20 becomes larger than the pressing force of the die retainer 5, the upper die 17 rises. Since the die retainer 5 is pressing the upper die 17 when the upper die 17 is raised, the posture of the upper die 17 is corrected by the die retainer 5.

Thus, the die retainer 5 moves up and down along the elevating guide rails 3 via the slider 4, the posture of the die retainer 5 is mechanically guaranteed, and the upper die 17 moves. The bush 18 and the guide pin 15 are fitted and removed smoothly without being twisted.

When the upper die 17 is conveyed, the lifting of the lift chain 20 may be stopped, only the die retainer 5 may be raised, and a crane (not shown) may be traversed.

The balance weight 9 is weight-balanced with the mold retainer 5 so that the mold retainer 5 can be moved up and down by the air motor 10 with a low torque, and the mold retainer 5 can be moved to a small position at a desired position. The holding force is used for holding.

Further, the upper mold 17 and the lower mold 16 may be closed by performing the reverse operation to the opening of the upper mold 17. As is clear from the above operation, the die retainer 5 only presses against the upper die 17 and does not require fixing work such as bolts, and the attaching / detaching operation is extremely simple. The lifting device for lifting is not particularly limited, and a cargo handling machine that is already installed can be used.

Next, an example of the pneumatic circuit will be described with reference to FIG.

An alarm mechanical valve 24 for detecting an upper limit position is connected to the air pressure source 22 via a lubricator 23, and the alarm mechanical valve 24 is provided on the upper part of the elevating post 2 and comes into contact with the slider 4. It is designed to switch. A direction switching valve 26 and an air alarm device 25 are connected to the alarm mechanical valve 24, and the lubricator 23 and the direction switching valve 26 communicate with each other when the alarm mechanical valve 24 is inactive.

A down path 33 and an up path 34 are connected to the direction switching valve 26, and the air motor 10 is connected to the down path 33 and the up path 34.

The direction switching valve 26 is provided in the descending path 33.
From the side, a descending speed controller 27, a pressure reducing valve 30, and a quick exhaust valve 31 are sequentially provided, and an ascending speed controller 28 and an upper limit stop mechanical valve 35 are provided on the ascending path 34. The mechanical valve 35 for stopping the upper limit
Is provided on the elevating post 2 so as to contact the slider 4 at the upper limit of the stalk.

Reference numeral 29 denotes an operating lever, which is interlocked with the direction switching valve 26, the descending speed controller 27, and the ascending speed controller 28.
By operating the operation lever 29, the air motor 10 can be rotated upward and downward, and the ascending / descending speed can be adjusted by the operation amount. Reference numeral 32 is a pressure gauge.

When the air motor 10 is rotated downward in the pneumatic circuit, the operating lever 29 is operated,
The valve position of the direction switching valve 26 is set to the left side, and the compressed air from the air pressure source 22 is supplied to the air motor 10 via the descending speed controller 27, the pressure reducing valve 30, and the quick exhaust valve 31. Rotate 10 downward.

When the air motor 10 is stopped, the direction switching valve 26 is moved to the neutral position by the operation lever 29, and the descending path 33 and the ascending path 34 are closed.

When the upper mold 17 is opened, the mold retainer 5 is lifted through the upper mold 17 by using a crane or the like so that the air motor 10 is rotated in the descending direction. While pushing the button downwards, rotate it forcibly in the upward direction.

When the air motor 10 is rotated upward while being urged to rotate the descending path 33 in the descending direction,
When the pressure in the descending passage 33 increases, and this pressure exceeds the set pressure of the circuit, the quick exhaust valve 31 operates to keep the pressure in the descending passage 33 constant, and the mold retainer 5 is It acts to press the upper die 17 with a constant pressure.

When the air motor 10 is rotated upward, the operating lever 29 is operated to move the direction switching valve 2
The valve position of 6 is set to the right, and the compressed air from the air pressure source 22 is supplied to the air motor 10 through the rising speed controller 28 and the upper limit stop mechanical valve 35.

Next, when the die retainer 5 rises too much,
The alarm mechanical valve 24 operates and the air alarm 25 becomes an alarm to warn the operator, and the operator stops the rising of the clen and the like.

Although the pneumatic motor is used as the motor in the above embodiment, it may be a hydraulic motor or a constant torque electric motor. It may be made lighter than the die retainer 5, the die retainer 5 may be lowered by its own weight, and the die retainer 5 may be raised by a required means including a manual operation.

[0037]

As described above, according to the present invention, the mold can be opened and closed easily with a simple structure, the size is small and the installation space is small, and the existing equipment can be used to manufacture the device. The cost is kept low, and the workability and handleability are improved, so that the safety is improved, and the excellent effects such as requiring no skill to attach and detach the mold are exhibited.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view showing a state in which a mold is opened in the embodiment.

FIG. 3 is a pneumatic circuit diagram showing an example of a pneumatic circuit used in the embodiment.

[Explanation of symbols]

 1 pedestal 2 lifting post 3 lifting guide rail 5 mold retainer 8 chain 10 air motor 17 upper mold 22 air pressure source

Claims (1)

[Claims] 1. An elevating post is erected on a pedestal on which a mold is installed, and a slide guide is provided on an elevating guide rail provided on the elevating post.
Is installed slidably, extends horizontally, and touches the upper die upper surface.
Touch the slider with a die retainer that touches and corrects the upper die posture.
Install sprocket at the upper and lower ends of the lifting post.
And hang a chain between the sprockets,
The slider and one of the sprockets.
A fluid pressure motor is provided by connecting to the
The fluid pressure motor rotates in the direction of lowering the die retainer.
Applying a predetermined fluid pressure to the fluid pressure motor so that it is biased
A mold opening / closing device characterized by being configured as follows .