JP2002011777A - Injection stretch blow molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection stretch blow molding device, the total height of which is suppressed lower so as to realize a compact, well-balanced and stable state and, in addition, at the center of a lower base of which, no obstacle is present. SOLUTION: This injection stretch blow molding device 50 has an injection molding part 68 and a stretch blow molding part 70 and, in addition, a rotating plate 66, which intermittently convey neck molds 90 arranged in response to the respective molding parts. In this case, this device has the lower base 54 fixed on a machine stand 52, an upper base 56, which is above the lower base 54 and on which the rotating plate 66 is held, a tractive plate 58 arranged below the lower base 54 and within the machine stand 52, a plurality of tie rods 62, which pass through the lower base 54 and connect the upper base 56 and the tractive plate 58, and a neck mold clamping cylinder 120, which is arranged within the machine stand 52 so as to vertically drive the tractive plate 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection stretch blow molding apparatus, and more particularly to an injection stretch blow molding apparatus for intermittently transporting a neck mold to at least an injection molding section and a stretch blow molding section by a rotating plate.

[0002]

BACKGROUND OF THE INVENTION As this kind of injection stretch blow molding apparatus, for example, Japanese Patent Publication No.
There is one as shown in JP-A-32211.

In this injection stretch blow molding apparatus, as shown in FIG. 4, each molding section such as an injection molding section 12 or a stretch blow molding section 14 is arranged at a predetermined position on a machine base 10. .

A lower base 16 is fixed on the machine base 10, and a support plate 20 is fixed above the lower base 16 via a tie bar 18.

An upper base 22 and a clamping plate 24 are arranged between the lower base 16 and the support plate 20 so as to be able to move up and down along the tie bar 18.

A rotating plate 26 is provided on the lower surface of the upper base 22 so as to be intermittently rotatable.

The rotary plate 26 is provided with a neck mold 28 at a position corresponding to each molding portion.
6 can be stopped at each forming part position by intermittent rotation.

Each molding unit, for example, the injection molding unit 12
Is provided with an injection cavity mold 30 and a stretch cavity molding section 14 is provided with a blow cavity mold 32, and a rotary plate 26 and an upper
Is lowered, each neck mold 28, the injection cavity mold 30 and the blow cavity mold 32 are closed.

Further, the mold clamping plate 24 is provided with an injection core mold 36 and a blow core mold 38 corresponding to each molding section, for example, the injection molding section 12 and the stretch blow molding section 14, and is provided on the support plate 20. Clamping plate 24 with mold clamping cylinder 40
Is lowered, the injection core mold 36 and the blow core mold 38 and each neck mold 28 can be clamped to the injection cavity mold 30 and the blow cavity mold 32.

On the mold clamping plate 24 at the position of the stretch blow molding section 14, there is provided a stretching rod lifting cylinder 44 which allows the stretching rod 42 to advance and retreat.

However, in such an injection stretch blow molding apparatus, the mold clamping of the injection core mold 36, the blow core mold 38 and the neck mold 28 is performed by the support plate 2 above the mold clamping plate 24.
0, the mold clamping force of the mold clamping cylinder 40 must be increased, and the mold clamping plate 24 is moved from below the support plate 20 to the injection cavity mold 30 and the injection cavity mold 30. It must be moved to the vicinity of the blow cavity mold 32, which requires a large moving stroke.

Therefore, the mold clamping cylinder 40 is large, the weight is large, and the length is also long, the overall height of the apparatus is high, and the heavy object is located at the highest position.
Very imbalanced and unstable.

Further, since the elevating cylinder 34 for elevating and lowering the upper base 22 is located substantially at the center of the lower base 16, the elevating cylinder 34 hinders a large blow stroke for tightening the blow mold. Will also be in a difficult state.

An object of the present invention is to keep the overall height of the apparatus low, to provide a compact, well-balanced and stable state,
Moreover, it is an object of the present invention to provide an injection stretch blow molding apparatus in which no obstacle is present at the center of the lower base.

[0015]

In order to achieve the above object, an injection stretch blow molding apparatus according to the present invention has an injection molding section and a stretch blow molding section, and is provided corresponding to each of the molding sections. In an injection stretch blow molding apparatus having a rotary plate for intermittently transporting a neck mold to each of the forming sections, a lower base fixed on a machine base, and an upper base provided above the lower base and supporting the rotary plate. A tow plate disposed in the machine below the lower base, a plurality of tie bars penetrating through the lower base and connecting the upper base and the tow plate, and disposed in the machine. And a mold clamping means for driving the towing plate up and down.

According to the present invention, the upper base and the towing plate are connected by the plurality of tie bars penetrating the lower base, and the towing plate is driven up and down by the mold clamping means provided in the machine base, thereby increasing the size. Without disposing the mold clamping means above the machine base, the overall height of the apparatus can be kept low to achieve a well-balanced and stable state.

Further, the mold clamping means pulls the towing plate in the machine base, and the towing of the towing plate only causes the upper base to move up and down. There is no fixed support plate above the upper base. Therefore, a very compact state can be obtained.

Further, since the upper base for supporting the rotating plate is raised and lowered by the mold clamping means provided in the machine base, there is no one for raising and lowering the upper base on the lower base. A sufficient blow stroke for clamping the blow mold in the portion can be ensured, and the maintenance work on the lower base can be easily performed without any obstacles.

In the present invention, a cylinder fixing plate for mounting an injection core mold clamping cylinder is provided above the upper substrate, and the cylinder fixing plate, the upper substrate,
The tow plate and the tie bar may be fixed to the tie bar so as to be able to move up and down integrally.

With such a configuration, even when the cylinder fixing plate for mounting the injection core mold clamping cylinder is provided above the upper base, the cylinder fixing plate moves up and down integrally with the upper base. The distance between the core and the upper base is kept constant, the stroke of the injection core mold clamping cylinder is minimized, and the size of the injection core mold clamping cylinder can be reduced.

Further, by having the injection core mold clamping cylinder, the mold clamping means in the machine base can be used as a mold clamping means dedicated to the neck mold, and the mold clamping means and the injection core mold clamping cylinder have functions. It is possible to achieve compactness by dispersing.

In the present invention, the mold clamping means may be provided at a position below the injection molding section.

With such a configuration, it is possible to generate a large clamping force at the injection molding portion requiring a clamping force more than other molding portions such as a stretch blow molding portion. The mold clamping force can be minimized and utilized effectively.

In this case, it is preferable that an auxiliary mold clamping cylinder for driving the lifting and lowering of the traction plate is provided at a position below the stretch blow molding section in the machine base.

With this configuration, the reaction force at the time of blow molding of the neck mold and the blow core mold in the stretch blow molding section can be received in a well-balanced manner.

In the present invention, it is preferable that a synchronizing means for synchronizing the two mold clamping cylinders is provided in the machine base.

With such a configuration, even if there are two driving cylinders for moving the tow plate, the calorie can be smoothly calcined by the synchronization means while the tow plate and the upper base are kept horizontal.

[0028] In the present invention, it is preferable that a stopper is provided on the blow molding portion side to regulate a lower limit position of the upper base when the upper base is lowered.

With such a configuration, even when the blow mold is opened, the lower limit position is reliably regulated by the stopper when the upper base is lowered, so that reliable positioning can be performed.

Further, another injection stretch blow molding apparatus of the present invention has an injection molding section and a stretch blow molding section, and a neck die provided corresponding to each of the molding sections is intermittently provided in each of the molding sections. In an injection stretch blow molding apparatus having a rotating plate for conveying, a lower base fixed on a machine base, an upper base arranged above the lower base and supporting the rotating plate, and the machine base below the lower base. And a plurality of tie bars penetrating the lower base and connecting the upper base and the traction plate, and disposed at a position below the injection molding part in the machine base. A mold clamping cylinder that drives the traction plate up and down, an auxiliary mold clamping cylinder that is disposed at a position below the stretch blow molding unit in the machine base and drives the traction plate up and down, and enables each of the tie bars to be synchronized. Installed in the machine stand And a synchronization means is, the synchronization means includes two racks to the stretch blow molding section side and the injection-molded portion of the lower base is disposed droops respectively,
It has two pinions fixed to a rotating shaft arranged between the injection molding part and the stretch blow molding part of the traction plate, and meshing with each of the racks.

According to the present invention, the pulling plate is driven by the mold clamping cylinder disposed below the injection molding section in the machine base, so that the apparatus can be arranged without disposing the mold clamping cylinder above the machine base. The overall height can be kept low, and a compact, well-balanced and stable device can be obtained.

Moreover, there is no obstacle in the center of the lower base, so that the opening and closing stroke of the blow mold can be made sufficiently large, and the maintenance work can be facilitated.

Further, the driving force of the mold clamping cylinder can be effectively used for an injection molding part requiring a large mold clamping force.

Further, by disposing an auxiliary mold clamping cylinder for driving the traction plate up and down at a position below the stretch blow molding section in the machine base, the upper base is well balanced between the injection molding section side and the stretch blow molding section side. Can be raised and lowered.

Further, two racks suspended from the lower base and two rotating shafts fixed between the injection molding portion and the stretch blow molding portion of the traction plate are attached to the synchronization means of the two mold clamping cylinders. By using the pinion, the upper base can be moved while maintaining the parallelism with the lower base with a simple configuration.

In particular, when closing the mold, it is important that the upper base is kept parallel.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 are views showing an injection stretch blow molding apparatus according to one embodiment of the present invention.

This injection stretch blow molding apparatus 50 is the same as that shown in FIG.
As shown in FIG. 3, the machine base 52, the lower base 54,
It has an upper base 56, a traction plate 58, and a cylinder fixing plate 60, and the upper base 56, the traction plate 58, and the cylinder fixing plate 60 penetrate the lower base 54, and a plurality of, for example, four tie bars 62 ( (See FIG. 1).

The machine base 52 has a box shape with an internal cavity, and has an injection device 64 attached to one side of the upper surface thereof.

The lower base 54 is fixed to the upper surface on the other side of the machine base 52.

The upper base 56 is disposed above the lower base 54 at a predetermined distance from the lower base 54, and rotatably supports the rotating plate 66 on the lower surface side.

The upper base 56 is provided with an injection device 64
It is in a state of being connected and fixed to an intermediate position between the two tie bars 62 on the side and the upper ends of the two tie bars 62 on the side opposite to the injection device 64.

The space between the lower base 54 and the rotary plate 66 is used as a molding space. As shown in FIG. 1, an injection molding section 68 is provided on the injection device 64 side, and a stretch blow molding section 70 is provided at a position facing the injection molding section 68. Injection molding section 66 and stretch blow molding section 7
A temperature control section 72 and a take-out section 74 are provided at a position crossing 0 and 90 degrees.

In the injection molding section 68, as shown in FIG.
An injection cavity mold 78 is mounted on the lower base 54 via the injection device 64 and a hot runner 76 that makes nozzle contact.

In the stretch blow molding section 70, as shown in FIG. 2, a blow cavity mold 84 composed of a split mold which can be clamped by a blow mold clamping mechanism 82 including a blow mold clamping cylinder 80 has a lower base 54. It is provided above.

In the temperature control section 72, a temperature control pot 86 is fixed on the lower base 54 as shown in FIG.

In the take-out section 74, as shown in FIG. 3, a shooter 88 for taking out a molded product is mounted on the lower base 54. (Omitted in FIG. 2) In addition, on the lower surface of the rotating plate 66, a plurality of, for example, two, for example, 2 corresponding to the respective positions of the injection molding section 68, the temperature control section 72, the stretch blow molding section 70, and the extraction section 74. Two neck molds 90 are provided.

The neck mold 90 is composed of split molds, and these split molds are respectively attached to a neck-type support plate 92 made of a dividing plate. The neck mold 90 can be opened and closed by opening and closing the neck-type support plate 92. I have.

The rotating plate 66 is intermittently rotatable by 90 degrees by an electric motor 94 provided on the upper base 56, and the neck mold 90 is connected to the injection molding section 68, the temperature control section 72, the stretch blow molding section 70, It can be sequentially conveyed to the take-out section 74.

The rotation stop position of the rotating plate 66 is
Although the positioning is performed by the positioning mechanism 96, only the positioning means of the servomotor may be used.

A temperature control core elevating cylinder 98 for raising and lowering a temperature control core (not shown) at a position corresponding to the temperature control unit 72 and a blow core for raising and lowering the blow core mold 100 at a position corresponding to the stretch blow molding unit 70 are provided on the upper base 54. Mold lifting cylinder 10
2 and an elongating rod elevating cylinder 106 for elevating and lowering the elongating rod 104, and an eject cam elevating cylinder 110 for elevating and lowering an eject cam 108 for opening the neck-type support plate 92 at a position corresponding to the take-out portion 74.

The cylinder fixing plate 60 is fixed to the upper ends of two tie bars 62 located on the side of the injection molding section 68 above the upper base 56, and the cylinder fixing plate 60 and the upper base 5 are fixed.
6, an injection core mold clamping plate 114 to which an injection core mold 112 is attached is attached so as to be able to move up and down along two tie bars 62.

An injection core mold clamping cylinder 116 is mounted on the cylinder fixing plate 60, and the tip of a piston 118 of the injection core mold clamping cylinder 116 is connected to the injection core mold clamping plate 114. .

The towing plate 58 is connected and fixed to the lower ends of the four tie bars 62 in the machine base 52.

The traction plate 58 has a neck mold clamping cylinder 1 as a mold clamping means located below the injection molding section 68.
20 is attached, and this neck mold clamping cylinder 12
The zero piston 122 is connected to the lower surface of the lower base 54.

Therefore, as shown in FIG. 3, when the neck mold clamping cylinder 120 is driven in a state where the traction plate 58 is raised, the tie bar 62 is pulled and lowered with the lowering of the traction plate 58. As shown in FIG. 2, the upper base 56 connected and fixed to the lower part 62 is lowered by the stroke L1, and the neck mold 90 attached to the rotating plate 66 is lowered. For example, in the injection molding part 68, the injection cavity mold 78
The neck mold 90 is clamped.

In the stretch blow molding section 70, the lower surface of the upper base 56 contacts the stopper 138 provided on the upper part of the blow mold clamping mechanism 82, and is positioned at the lower limit position of the upper base 56.

Further, in the temperature control section 72 and the stretch blow molding section 70, the temperature control pot 86
Then, the blow cavity mold 84 is clamped by the blow mold clamping mechanism 82.

When the upper base 56 is lowered, the cylinder fixing plate 60 fixed to the upper ends of the two tie bars 62 on the side of the injection molding section 68 also has the same stroke L as the upper base 56.
It has been lowered for one minute.

In this state, in the injection molding section 68, the injection core mold clamping plate 116 is driven to lower the injection core mold clamping plate 114 by the stroke L2, so that the injection core mold 112 and the neck mold 90 are molded. Tightening and injection device 6
4, the preform 124 is injection-molded by injecting the molten resin into the injection cavity mold 78.

In this case, the injection core mold clamping cylinder 11
6 is lowered integrally with the lowering of the upper base 56, so that the distance from the upper base 56 is always kept constant.

Therefore, the injection core mold clamping cylinder 11
6 is the minimum stroke from the position where the injection core mold 112 is retracted from the rotary plate 66 to the mold clamping position, so that the length of the injection core mold clamping cylinder 116 can be shortened.

In addition, the injection core mold clamping cylinder 116
It is sufficient if a mold clamping force sufficient to mold the injection core mold 112 is obtained.
Can be relatively small.

Accordingly, the overall height of the injection stretch blow molding apparatus 50 can be kept low, and the weight on the upper side can be kept low to achieve a good balance and a stable state.

The neck mold clamping cylinder 120 is
It suffices if there is a mold clamping force that matches the mold clamping force of the neck mold 90, and it can be made relatively small.

In addition, the neck mold clamping cylinder 12
0 is disposed below the injection molding section 68,
Even if the neck mold clamping cylinder 120 is relatively small, the mold clamping force can be effectively used.

Here, at the same time as the molding operation of the injection molding section 68, in the temperature control section 72, a temperature control core (not shown) is inserted into the temperature control pot 86 by the temperature control core raising / lowering cylinder 98 and the preform 124. Temperature control.

In the stretch blow molding section 70, the blow core mold 100 is
Is lowered, and the blow core 100
And the extension rod lifting cylinder 106
The stretching rod 104 is moved down to supply the blow air into the blow cavity mold 84, and the preform 124 whose temperature is controlled is biaxially stretched and blown to form a bottle 126.

Further, in the take-out section 74, the eject cam 108 is lowered by the eject cam elevating cylinder 110, the neck mold 90 is opened via the neck mold support plate 92, the bottle 126 is dropped, and the bottle 126 is dropped by the shooter 88. They are discharged outside the device.

Next, after completion of each molding step, the blow cavity mold 84 is opened by the blow mold clamping mechanism 82, the upper base 56 is raised by the neck mold clamping cylinder 120, and the injection core mold clamping cylinder 116 is heated. The injection core mold 112, the temperature adjustment core, the blow core mold 100, the extension rod 104, and the eject cam 1 are controlled by the adjusting core elevating cylinder 98, the blow core elevating cylinder 102, the elongating rod elevating cylinder 106, and the eject cam elevating cylinder 110.
If 08 is retracted from the position of the rotating plate 66, the rotating plate 66 becomes rotatable.

In this state, the rotary plate 66 is intermittently rotated by the electric motor 94, so that the forming in each forming portion can be performed sequentially.

The stretch blow molding section 70 of the towing plate 58
An auxiliary mold clamping cylinder 128 is provided at a position below the auxiliary mold clamping cylinder 128. The tip of a piston (not shown) of the auxiliary mold clamping cylinder 128 is connected to the lower base 54, and the injection molding part 68 and the stretch blow molding part 70 are connected. The upper base 56 is lifted and lowered in a well-balanced manner so that it can be lifted and lowered smoothly.

Further, a synchronizing means 130 for synchronizing the neck mold clamping cylinder 120 and the auxiliary mold clamping cylinder 128 is provided in the machine base 52.

The synchronizing means 130 is provided with two racks 132 suspended from the injection molding section 68 side and the stretch blow molding section 70 side of the lower base 54, respectively. It comprises a rotating shaft 134 disposed between the blow molding sections 70 and two pinions 136 fixed to the rotating shaft 134 and engaged with each rack 132.

With the above-described structure of the synchronization means 130, each mold clamping cylinder 120, 1
28 can be synchronized so that the upper base 56 can be moved up and down smoothly while keeping it horizontal.

The injection molding section 68 also has the upper base 56.
Stopper rod 14 for supplementarily restricting the lowering limit of
0 is provided.

The present invention is not limited to the above embodiment, but can be modified in various forms within the scope of the present invention.

For example, in the above-described embodiment, four molding processing sections including an injection molding section, a temperature control section, a stretch blow molding section, and a take-out section are provided, and a rotating plate is intermittently rotated by 90 degrees to convey a molded article. However, the present invention is not limited to this example, and the molding processing section may have at least an injection molding section and a stretch blow molding section, and a molded article may be taken out by the stretch blow molding section. It is also possible to arrange the forming section and the stretch blow forming section at opposing positions, and to intermittently convey the rotary plate by 180 degrees.

It is also possible to arrange an injection molding section, a stretch blow molding section, and the like at three locations, and to rotate intermittently by 120 degrees. In that case, three tie bars may be used.

Further, each mold clamping mechanism is not limited to the one using a cylinder and a piston, and various mechanisms such as a toggle mechanism may be used.

[Brief description of the drawings]

FIG. 1 is a plan view showing an injection stretch blow molding apparatus according to one embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the injection stretch blow molding apparatus of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a sectional view showing a conventional injection stretch blow molding apparatus.

[Explanation of symbols]

 Reference Signs List 50 Injection stretch blow molding device 52 Machine base 54 Lower base 56 Upper base 58 Traction plate 60 Cylinder fixing plate 62 Tie bar 66 Rotating plate 68 Injection molding unit 70 Stretch blow molding unit 82 Blow mold clamping mechanism 90 Neck mold 112 Injection core mold 114 Injection Core mold clamping plate 116 Injection core mold clamping cylinder 120 Neck mold clamping cylinder 128 Auxiliary mold clamping cylinder 130 Synchronizing means 132 Rack 134 Rotating shaft 136 Pinion 138 Stopper

Claims (7)

[Claims] 1. An injection stretch blow molding apparatus having an injection molding section and a stretch blow molding section, and having a rotary plate for intermittently transporting neck molds disposed corresponding to the respective molding sections to the respective molding sections. A lower base fixed on a machine base; an upper base arranged above the lower base to support the rotary plate; a tow plate arranged in the machine below the lower base; A plurality of tie bars penetrating a base and connecting the upper base and the traction plate, and mold clamping means disposed in the machine base to drive the traction plate up and down, comprising: Stretch blow molding equipment. 2. The cylinder fixing plate according to claim 1, wherein a cylinder fixing plate for mounting an injection core mold clamping cylinder is disposed above the upper base, and wherein the cylinder fixing plate, the upper base, and the traction plate are the tie bars. An injection stretch blow molding apparatus, characterized in that the injection stretch blow molding apparatus is fixed to and can be moved up and down integrally. 3. The injection stretch blow molding apparatus according to claim 1, wherein the mold clamping unit is disposed below the injection molding unit. 4. The injection stretch blow molding according to claim 3, wherein an auxiliary mold clamping cylinder for driving the traction plate up and down is provided at a position below the stretch blow molding section in the machine base. apparatus. 5. The injection stretch blow molding apparatus according to claim 4, wherein a synchronization means for synchronizing the two mold clamping cylinders is provided in the machine base. 6. The injection according to claim 1, wherein a stopper is provided on the blow molding portion side to regulate a lower limit position of the upper base when the upper base is lowered. Stretch blow molding equipment. 7. An injection stretch blow molding apparatus having an injection molding section and a stretch blow molding section, and having a rotary plate for intermittently transporting neck molds disposed corresponding to the respective molding sections to the respective molding sections. A lower base fixed on a machine base; an upper base arranged above the lower base to support the rotating plate; a tow plate arranged in the machine below the lower base; A plurality of tie bars penetrating a base and connecting the upper base and the traction plate; a mold clamping cylinder disposed at a position below the injection molding portion in the machine base and driving the traction plate up and down; An auxiliary mold clamping cylinder disposed at a position below the stretch blow molding section in the machine base to drive the traction plate up and down, and a synchronization means provided in the machine base so that the tie bars can be synchronized. And the synchronization means comprises: Two racks respectively suspended from the injection molding section and the stretch blow molding section of the lower base, and a rotation arranged between the injection molding section and the stretch blow molding section of the traction plate. An injection stretch blow molding device, comprising: two pinions fixed to a shaft and engaged with the racks.