JPH0372448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding apparatus equipped with a mold attachment/detachment device.

(Prior art and its problems) To set a mold in an injection molding machine, lift the mold with a hoist, insert it from above between the die plates on the fixed side and the movable side of the molding machine, The mold is lowered onto a mold holder provided on the die plate, and the height of the mold is adjusted by moving the holder up and down, and then fixed to the die plate.

However, since there are guide bars at the four corners between the two die plates to guide the movement of the movable die plate, when changing the mold, the mold must be inserted by bypassing the guide bars, which reduces work efficiency. Bad, again.
The mold sometimes hit the guide bar, damaging the guide bar and the mold.

Furthermore, since a hoist is required, the equipment becomes large-scale, and there is also the problem of having to raise the ceiling of the workshop.

The mold is moved in and out between the die plates using a dedicated mold removal device for large injection molding machines, but it is large and expensive, and is useless while the injection molding machine is in operation. If the device is placed near the molding machine, it will interfere with the molding operation, and if it is placed away from the molding machine, it will be inconvenient to use.

(Means for solving the problem) The present invention provides a mold attachment/detachment device in the molding machine itself,
However, the purpose of this invention is to reveal an injection molding machine that can solve the above problem by manually pushing the mold to the mounting position of the die plate, removing it from the die plate, and pulling it out.

The present invention has a fixed die plate 2, a movable die plate 2,
A mold holder 5 which is horizontally supported and has a rotating roller 51 on its upper surface is disposed below each of the mold holders 3, and the machine holder 1 has a rotating roller 61 on its upper surface and its base end is connected to each of the mold holders. Two support arms 6 pivoted on the extension of 5, 5
Each support arm 6 is provided so as to be rotatable between a horizontally protruding mold support position and an upwardly raised retracted position.

(Operation and Effect) The mold 8 is placed on the support arm 6 set at the mold support position.
When the mold 8 is placed and pushed between the die plates 2 and 3, the mold 8 slides over the rollers and is transferred to the pedestal 5 and transferred.

Once the mold 8 is placed on the pedestal 5, the support arm 6 can be rotated and set in the retracted position.

By setting the support arm 6 to the retracted position,
There is no problem in moving the safety cover 15 surrounding the molding section, and a passage for the operator can also be secured.
Since the injection molding machine itself is equipped with a support arm 6,
Unlike conventional mold attachment/detachment devices, it does not interfere with the storage space of the injection molding machine while it is in operation.

(Example) Fig. 1 shows a medium-sized injection molding machine, and as is well known, a fixed die plate 2 for mounting a fixed mold is placed approximately in the center of the upper surface of the machine base 1, and a fixed die plate 2 for mounting a movable mold is located opposite to the die plate 2. A moving die plate 3 is arranged so as to be able to approach and separate from each other, and a pressing device 1 of a toggle mechanism is linked to the moving die plate 3.

A heating cylinder 12 is installed behind the fixed die plate 2.
A hydraulic unit 14 for driving the molding machine is also provided, and a pellet hopper 13 is connected to the base end of the heating cylinder.

Machine stand 1 is about 4500mm long, about 500mm high, machine stand 1
The distance from the bottom of the heating cylinder to the center of the heating cylinder, that is, the mold installation center, is about 1000 mm, which is about 2/3 of the height of the machine base 1 of a conventional medium-sized machine.

The height to the pellet hopper is also low at approximately 1,700 mm, making it within the reach of the operator, making it possible to feed pellets without using a stepladder.

Because the machine base 1 has been lowered and the mounting position of the mold has been lowered, the hydraulic unit, which was installed inside the machine base 1 in the conventional machine, has been placed on the top surface of the machine base 1 as described above, and
A compact control unit main body 16 is provided inside.

The four corners of the fixed die plate 2 and the pressing device 11
Four guide bars 4 that pass through the movable die plate 3 and guide the reciprocating movement of the movable die plate 3 are provided between the two die plates, and sub-plates are provided inside each die plate.

A safety cover 15 is provided on the machine stand 1 so as to be able to slide between the pressing device 11 and the fixed die plates 2 and 3. When the molding machine is in operation, the cover 15 is slid toward the fixed die plate 2 side to prevent molding. When replacing the mold 8, it is slid toward the pressing device 11 to release the molding part.

A known mold holder 5 is provided at the bottom of the die plates 2 and 3. The pedestal 5 has a plurality of rotating rollers 51 supported at the same height on its upper surface, and a mold 8 is placed on the rollers, and the upper edges of the opposing surfaces of both pedestals 5 are slightly higher than the rollers 51. A straight guide portion 52 is formed.

The pedestal 5 is provided so as to be movable up and down as required, and is connected to an elevating drive device 53.

The proximal ends of mold support arms 6 are pivotally supported at the lower side surfaces of both die plates 2 and 3, and are arranged so as to be rotatable in a plane perpendicular to the mold clamping direction.

A plurality of rotary rollers 61 are supported on the support arm 6 so that when it is laid down horizontally, the mounting height is approximately the same as that of the roller 51 of the pedestal 5, and the upper edge of the opposing surface of the support arm 6 is slightly higher than the rollers. Natsuta straight guide section 6
2 is formed.

A roller 61 and a guide section 62 of the support arm 6 are located on an extension of the roller group of the pedestal 5 and the guide section 52.

The support arm 6 has an outward pin 63 protruding from its base end, and a locking hole 64 formed at its distal end.

On each die plate 2, 3, on the upper part of the support arm 6,
A hanging arm 7 for horizontally holding the die plates 2 and 3 is provided with its base end pivotably supported so as to be rotatable in a plane perpendicular to the mold clamping direction.

As shown in FIG. 3, a locking groove 71 into which the outward pin 63 of the support arm 6 is fitted is formed on the side surface of the lower end of the hanging arm 7, and the groove has an L-shape and is downward at the back.

A locking bolt 72 is provided on the base end side of the hanging arm 7, and the bolt is inserted into the locking hole 64 of the supporting arm 6 when the supporting arm 6 is rotated upward and overlapped with the hanging arm 7 at the retracted position. Match position.

However, the support arm 6 is located deep inside the locking groove 71 of the hanging arm 7.
The supporting arm 6 is set at the mold supporting position by fitting the pin 63, and the mold 8, which is set horizontally in a clamped state, is placed on the supporting arm 6. At this time, both bases 81, 81 of the mold 8 are placed on the roller 61, and the base 81 is made to follow the guide portion 62 of the support arm 6.

When the mold 8 is manually pushed between the die plates 2 and 3, the mold 8 slides over the rollers 61 and is transferred to the pedestal 5.

Once the mold 8 is placed on the pedestal 5, lift the support arm 6 slightly, pull the hanging arm 7 outward, and open the locking groove 71.
Remove pin 63 from. Rotate the support arm 6 upward and fold it to the retracted position, and then tighten the stop bolt 7 of the hanging arm 7.
3 into the stopper hole 64 to fix both arms 5 and 6.
This prevents the support arm 6 from falling down accidentally.

By folding the support arm 6 to the retracted position as described above, there is no problem in moving the cover 15 surrounding the molding section, and a passage for the operator can also be secured.

The height of the mold 8 on the pedestal 5 is adjusted as necessary by the lifting drive device 53, and the mold 8 is bolted to the sub-plate on the die plate.

To remove the mold 8, the procedure is reversed to that described above, and the mold can be pulled out from the cradle 5 onto the horizontal support arm 6.

To place the mold on the support arm 5 or take it out,
A small transport vehicle that lifts the table or a robot for changing molds can be used.

Since the support arm 6 is provided in the injection molding machine itself, there is no need to worry about where to store it while the injection molding machine is in operation, unlike the conventional mold attachment/detachment device.

The present invention is not limited to the above configuration,
Various modifications are possible within the scope of the claims.

[Brief explanation of drawings]

Fig. 1 is a front view of the injection molding machine, Fig. 2 is an oblique view of the mold attachment part, Fig. 3 is a sectional view along the line shown in Fig. 1, and Fig. 4 is a left side view of Fig. 3. . 2... fixed die plate, 3... movable die plate, 4... guide bar, 5... cradle, 6...
Support arm, 7...Hanging arm.

Claims (1)

[Scope of Claims] 1. A mold holder 5, which is horizontally supported and has a plurality of rotating rollers 51 on the upper surface, is provided below the opposing surfaces of the stationary and movable die plates 2 and 3. 1 is equipped with two support arms 6 having a plurality of rotating rollers 61 on the upper surface and whose base ends are pivoted on extensions of the respective mold holders 5, 5, and each support arm 6 projects horizontally. An injection molding machine that is rotatable between a mold support position and an upwardly raised retract position. 2. The injection molding machine according to claim 1, wherein the mold holder 5 is attached to the die plates 2 and 3 so as to be movable up and down, and is connected to a lifting device 53. 3 The support arm 6 has an outward pin 63 protruding from the side surface of its tip, and the lower end of a hanging arm 7 whose end is pivotally supported above the support arm 6 is removably engaged with the outward pin 63 for support. An injection molding machine according to claim 1 or 2, in which the arm 6 is supported horizontally.