JP3312764B2 - Molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus and, more particularly, to an ejecting structure for removing a molded article such as a plastic container formed by blow molding.

[0002]

2. Description of the Related Art Thin-walled synthetic resin containers (hereinafter referred to as molded products) generally called biaxially stretch blow molded containers.
For example, a preform obtained by injection molding is positioned in a blow mold cavity, stretched in the axial direction of the container, and expanded in a direction perpendicular to the axial direction by the pressure of gas blown into the container. Have been done.

[0003] As an apparatus for forming such a molded product, there is, for example, an apparatus provided with an intermittently rotating turntable, which supports a split lip support plate and a split lip mold. . The turntable is an injection molding station,
One cycle of the molding process is performed by passing through a temperature control station, a blow molding station, and an eject station. This method is called a hot parison method or a one-stage method.

When a molded article is molded by the above method, the preform is conveyed to a blow molding station while the lip portion of the preform corresponding to the neck of the molded article is held by the lip mold, and the preform is re-formed. After the bottle is formed by axial stretch blow molding, it is further transported to the eject station, where the support plate is separated by the molded product removal device and the lip mold is opened, so that the molded product is released and removed. Has become.

[0005] In such a molding apparatus, when the lip is opened, the lip adheres to one of the lips, so that the lip may not be properly released. One of the causes of such a phenomenon is the presence of a screw formed on the outer periphery of the lip. That is, since the screw has a large contact area with the lip type and does not provide a significant cooling effect from the lip type, the screw easily adheres to the surface of the so-called lip type.

Accordingly, for example, Japanese Patent Publication No. 53-2209
As disclosed in Japanese Patent Publication No. 5 (1993) -1995, there is known a structure in which a blow-down pipe is provided to enter a molded article when the molded article is taken out, and the molded article is forcibly dropped by blowing air on the molded article. I have.

[0007]

However, when the molded article is forcibly dropped by blowing air, the following problems arise.

That is, when the lip molds are opened, it is desirable that the lip portions of the divided lip molds proceed in the same state. However, when the lip is attached to one of the lip molds, the center position of the molded product is deviated to one side based on the division position of the lip mold. On the other hand, the center position of the blow-down pipe for blowing air is made to coincide with the position of the split surface of the lip type forming the split type. Therefore, the center position of the blow-down tube and the center position of the lip portion are shifted. For this reason, when air is blown from the blow-down pipe, a moment having a radius of the center position deviation with respect to the molded product is generated. In particular, when the air blowing start timing is performed substantially simultaneously with the start of the mold opening, the holding force on the lip portion is lost at the same time as the mold opening is started, so that a moment due to the air blowing is easily generated. As a result, the molded product is inclined by the moment.

When the molded product is tilted in this way, FIG.
As shown in FIG.
The thread is caught on the thread portion of No. 0, so that free fall is hindered. Also, if the lip portion 410 and the lip mold 4
Even when there is no catch between the screws with 20,
If it falls in an inclined state, it will be caught in the opening of the chute formed in the eject station,
The removal to the outside of the device will not be performed normally.

[0010] The inclination of the molded article may be affected by the position of the center of gravity of the molded article. In particular, in the case of a molded product having a light weight and a high center of gravity, there is a case where the center of gravity is biased by attaching a handle or the like to a part of the outer peripheral surface. Moments tend to occur, and the molded product tends to tilt.

As described above, when the molded product is caught by the eject station and is not taken out of the apparatus, the molded product hinders other operations and interrupts the molding cycle.

However, when the molding cycle is controlled based on the state of removal of the molded article, for example, if the molding cycle is interrupted when the molded article is clogged,
The molding cycle will require time to remove the cause of the interruption. Therefore, the time required for the molding cycle becomes longer. In addition, the number of interruptions may increase, and in this case, it may cause a reduction in molding efficiency.

In view of the above-mentioned problems in the conventional molding apparatus, it is an object of the present invention to adjust the falling posture of the molded article regardless of the position of the center of gravity and the weight of the molded article to assure normal ejection. Accordingly, an object of the present invention is to provide a molding apparatus having a structure capable of enabling continuous molding.

[0014]

In order to achieve this object, the invention according to claim 1 includes a lip mold comprising a split mold for holding a lip portion of a molded article, and the molded article is formed by the lip mold. In a molding apparatus having a structure in which the lip mold is opened at the take-out position, the lip is opened, and a molded product is dropped and taken out by releasing the lip, the lip can be inserted into the lip. Outer diameter
A small-diameter portion having:
With a large-diameter part having an outer diameter larger than the diameter of the lip part.
And, before mold opening of the lip type, the smaller diameter portion is held in the lip mold in the lip portion of the set the molded article to the take-out position is inserted driven, restricting the horizontal movement of the lip portion The eject core, and a guide member that is movably provided at the removal position of the molded product and guides the molded product to fall, and the guide member is moved until the molded product reaches the removal position. Set at a first position corresponding to a position that does not interfere with the rotational movement path of the molded product, and after the molded product has reached the take-out position, before the lip mold is opened, the outer periphery of the molded product driving means for moving to a second position opposite to the face, the provided cross-sectional shape of the body portion of the molded article is formed in a rectangular,
The driving means moves the guide member along a horizontal direction.
To set the first and second positions, and the second position
By the guide member set at the position, the molded product
It is characterized by restricting rotation .

According to a second aspect of the present invention, a plurality of molded articles can be reclaimed.
With a split lip to hold the lip,
With this lip mold, multiple molded products can be turned to the take-out position.
Roll and convey, and open the lip mold at the removal position.
And remove multiple molded products by releasing the lip.
In the molding apparatus having a structure for taking out so made, the
A small-diameter portion having an outer diameter that can be inserted into the lip portion;
It is provided on the upper part of the diameter part and is larger than the diameter of the lip part
Each having a large diameter portion having an outer diameter and the lip type
Before opening the mold, it is held by the lip mold and
In each lip part of the plurality of molded products set in
The small-diameter parts are inserted and driven, respectively, and
Multiple ejects that regulate the horizontal movement of the lip
The core and the multiple molded products can be moved to the removal position.
Guide that guides the plurality of molded products
The member and the guide member are taken out by the plurality of molded products.
Rotation of the above-mentioned molded products
Set to the first position corresponding to a position that does not interfere with the motion path
Then, after the plurality of molded products reach the removal position,
Before the lip mold is opened, the multiple molded products
To move to a second position facing each outer peripheral surface of
Means, and the guide member is provided with the plurality of molded articles.
Is formed in a box shape with a partition part that partitions the falling path of
The driving means is provided with the guide along the falling direction of the molded product.
Move the member to set the first and second positions,
The height of the top of the guide member set at the second position
Is for 2 minutes of the body of the molded product held by the lip mold.
Height shifted to the lip part side from the height position
It is characterized by being.

[0016]

[0017]

[0018]

According to the present invention, there is provided a guide member for guiding the falling of the molded product which is positioned at the first position corresponding to a position which does not interfere with the molded product until the molded product is conveyed to the take-out position. I have. And this guide member, before the molded article reaches the removal position and the mold opening is started,
It is positioned at a second position facing the outer peripheral surface of the molded product. Therefore, when the mold is opened and the lip portion is released, the molded product is guided in a falling manner while being restrained from being inclined by the guide member and maintaining a substantially vertical posture.

Further, in the present invention, the guide member is driven to move between the first position and the second position by the driving means capable of changing the stroke. Therefore, by controlling the stroke, the second position of the guide member can be set according to the height of the molded product.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a plan view showing a machine base 20 of a blow molding apparatus 10 as an example of a molding apparatus according to the present invention. The blow molding apparatus 10 employs a one-stage system in which a preform can be molded on one rotary plate by an injection molding mechanism.

The machine base 20 is provided with a turntable 22. The turntable 22 is provided so as to be intermittently rotatable with respect to the machine base 20 in the direction of the arrow shown in the figure, and the preform injection molding station 12, the temperature control station 14, the stretching blow station 16 and the eject station 18 are arranged along the rotation direction. There are four stations.

The rotary platen 22 is provided with four lip-type transfer plates 24 corresponding to each station while moving each station. These lip-type transfer plates 24 hold the lip portion of the preform corresponding to the neck of the molded product while moving from each station to the eject station 18.

The lip-type transfer plate 24 is provided with a lip-type support plate 26 having a split-type structure. The lip-type support plate 26 is provided with a lip 28 for holding a neck of a molded product. Have been.

As shown in FIG. 2, the lip-type support plate 26 is composed of two elongated divided plates 26A, 2A and 2B.
6B is a rectangular member obtained by combining in the width direction. Further, the number of the support portions 30 of the lip mold 28 is formed at the position where the divided plates 26A and 26B face the mating surface in accordance with the number of simultaneous moldings, and is provided at two places in the present embodiment.

In the support portion 30, lip molds 28 each having a split mold are attached. The split plates 26A and 26B are normally set in a state where the mating surfaces are brought into close contact with each other by a spring 32 and closed.

Further, a wedge-shaped hole 34 is formed on the mating surface of the divided plates 26A and 26B at both ends in the longitudinal direction.
When the eject cam 36 enters when the divided plates 26A and 26B reach 8, the divided plates 26A and 26B
26B is released to release the holding of the lip portion.

The lip type support plate 2 having such a structure
The turntable 22 provided with the lip 6 is provided with a lip portion of the preform formed in the injection molding station 12 and a lip mold 2.
Then, the process proceeds to the temperature control station 14 and the stretch blow molding station 16 while holding by the step 8, and after forming a container as a molded product by blow molding, the process proceeds to the eject station 18 to take out the molded product.
The molding process of the cycle is performed.

On the other hand, the eject station 18
A molded product take-out device 40 is provided.

The take-out device 40 according to the present embodiment includes, in addition to the above-described eject cam 36, an eject core 52 that enters the inside of the neck of the molded product 100 when the lip mold 28 is opened.

That is, FIG.
FIG. 4 is a view showing a state when the molded article 100 is taken out by the ejecting station 18.
And a lip-type opening fixing base 42 arranged on the upper surface of the turntable 22 in FIG. This lip-type mold opening fixing base 42
Is mounted on, for example, a substrate 44 fixed to the base 20 and provided close to the upper surface of the turntable 22, and an eject core fixing plate 48 that can be moved up and down by a guide rail 46 is disposed on the upper surface. Have been. The eject core fixing plate 48 is set so that the eject core 52 is retracted from the lip 110 of the molded article 100 and enters the lip 110 by using the cylinder 50 as a driving source. . The above-described eject cam 36 is attached to the lower surface of the eject core fixing plate 48, and is provided in the wedge-shaped hole 34 of the lip type support plate 26 so as to be able to advance and retreat. When the lip 28 is inserted into the wedge-shaped hole 34, the lip 28 is opened. The operation timing of the eject core fixing plate 48 in the take-out device 40 is determined by driving the cylinder 50 when the lip-type support plate 26 reaches the eject station 18 by detecting means (not shown). The lip mold 28 and the wedge-shaped hole 3 respectively correspond to the core 52 and the eject cam 36.
4 is set at a timing at which it can be inserted.

On the other hand, at a position where the lip 28 is opened by the operation of the take-out device 40, a take-out mechanism 60 for guiding the released molded product to the outside of the device is provided.

That is, the take-out mechanism 60 includes a chute 62 and a guide member 64 formed on the base 20 side in FIG. The chute 62 has an opening 62A formed on the upper surface on the base 20 side facing the molded article 100 which has reached the take-out position, and a passage from the opening 62A to the outside of the apparatus is formed.

The guide member 64 is for vertically regulating the posture of the molded product 100. For example, as shown in FIG. 5, a frame in which only one molded product can pass is divided into a plurality of portions. Alternatively, a guide body 64A composed of a box and an air cylinder 64B connected thereto
And

The air cylinder 64B is fixed to the base 20 side, and the guide body 64A is positioned at a first position which does not interfere with the molded article 100 as shown by a solid line in FIG.
As shown by a two-dot chain line, the molded article 100 can be moved to a second position that can face the body. In this case, the second position is such that even if the posture of the molded article 100 is inclined, the guide body 64 can be corrected to a vertical posture by entering into the space of the guide body 64A.
A means the state where the top of A is located, and in the case of the present embodiment, it corresponds to a position of about half of the body or a position slightly closer to the lip, regardless of the height of the molded article 100. ing. For this reason, the stroke of the air cylinder 64B has a variable structure so that the second position can be set according to the height of the molded article 100.

The space of the guide body 64A into which the molded article 100 enters is formed, for example, in a funnel shape, and the opening on the side into which the molded article 100 enters can be inserted into the space regardless of the inclination amount of the molded article 100. The size may be set, and the orientation of the molded product may be corrected to a vertical posture in the space.

Switching between the first and second positions is as follows.
The molded product 10 is controlled by a molding sequence control means (not shown).
Until 0 reaches the removal position, the second position is maintained before the molded product 100 reaches the removal position and the lip mold 28 is opened, for example, about 1 to 2 seconds before the molded product 100 reaches the removal position.
Is switched to the position.

Next, the operation will be described.

The guide body 64A is maintained at the first position until the lip-type transfer plate 24 reaches the eject station 18 by the rotation of the turntable 22. Therefore, the molded article 100 held by the lip mold 28 can move smoothly because there is no obstacle between the molded article 100 and the base 20 before moving to the eject station 18. .

On the other hand, when the lip type transfer plate 24 is located at the eject station 18, the lip type 2
8 is opened. The mold opening is performed when the eject cam 36 of the eject core fixing plate 48 provided in the take-out device 40 enters the wedge-shaped hole 34 of the lip-type support plate 26.

Prior to the opening of the mold, the air cylinder 64B is operated in the guide mechanism 60, and the guide body 64A is operated.
Is set from the first position to the second position. Therefore, when the molded product 100 held by the lip mold 28 falls, the posture of the molded product 100 is regulated by the guide main body 64A to be in a vertical state, and is guided to the opening 62A of the chute 62.

According to this embodiment, the molded article 1 held by the lip mold 28 by a simple structure consisting only of the combination of the guide body 64A and the air cylinder 64B for driving the guide body 64A.
00 can be corrected.

In the above embodiment, the orientation of the molded article 100 is regulated by the guide member 64 facing the body of the molded article 100. This structure is applied to an ejector inserted into the lip of the molded article 100. It is also possible to regulate the posture of the molded article 100 in combination with the core 52. That is, for example, as shown in FIG. 6, the eject core 52 includes a synthetic resin frame 52 having an outer diameter corresponding to the diameter of the lip portion at a tip portion which enters the inside of the lip portion.
A may be attached. The frame body 52A is for restricting the lip portion from adhering to one lip mold and moving in the horizontal direction when the mold is opened. Accordingly, a small-diameter portion large enough to enter the inside of the lip portion and a large-diameter portion capable of contacting the upper end surface of the lip portion are formed in the top body 52A. Is suppressed, and if it does, the posture is regulated by the guide member 64. With such a structure, the molded article 100
Will be restricted from the stage of generation.

In the above-described guide member 64, the shape of the guide body 64A may be set according to the shape of the molded product.

FIG. 7 shows a case where, for example, the cross-sectional shape of a molded product 200 is rectangular and a handle 210 is provided on a part of the rectangular shape. In the guide member 70 that regulates the posture of the molded article 200 having such a shape, the guide main body 70A is set to a half shape with respect to the shape of the molded article 200, and the air cylinder 70B is connected to each guide main body 70A. . In such a structure, the first position of the guide main body 70A is set at a position deviating from the conveyance trajectory of the molded product 200 indicated by a dashed line in the figure, and the second position is set at the cylinder of the molded product 200. The portions are set along the horizontal direction at positions facing the portions.

The second position should preferably be close to the body surface of the molded article 200. This is to prevent the molded product 200 from rotating. That is, in the case of such a molded product 200, for example, the number of leads of the screw portion formed on the outer periphery of the lip portion may be large. For this reason, when the lip mold is opened, as the mold opening progresses, the position of the screw that was initially in contact changes in the lead direction, whereby the screw of the lip is dragged by the lip-shaped screw. May rotate.

Further, when the number of simultaneously molded articles increases, as shown in FIG.
It is also possible to provide a partition 80B inside 0A and connect the air cylinders 90 at both ends in the arrangement direction of the molded products 100.

[0048]

As described above, according to the present invention, when a molded product is released from the removal position, it corresponds to a position where it does not interfere with the molded product until the molded product is transported to the removal position. A guide member positioned at the first position; The guide member is positioned at the second position facing the outer peripheral surface of the molded product before the molded product reaches the removal position and the mold opening is started. Therefore, when the mold is opened and the lip portion is released, the molded product is guided to fall while the inclination is regulated by the guide member and the vertical position is maintained.

Further, in the present invention, the guide member is driven to move between the first position and the second position by the driving means capable of changing the stroke. Therefore, by controlling the stroke of the driving means, the second position of the guide member can be set at a position corresponding to the height of the molded product.

Therefore, it is possible to reliably prevent clogging of the molded product at the take-out position, thereby reducing the chance of interrupting the molding process.
Thereby, continuous molding can be made possible.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining the overall configuration of a base used in a molding apparatus according to the present invention.

FIG. 2 is a perspective view showing a structure of a lip used in the molding apparatus shown in FIG.

FIG. 3 is a partial cross-sectional view showing a lip-type mold opening structure shown in FIG. 2;

FIG. 4 is a partial cross-sectional view showing a structure at a take-out position in the molding apparatus shown in FIG.

5 is a perspective view showing a structure of a guide member provided at a take-out position shown in FIG.

FIG. 6 is a sectional view showing a part of the lip-type mold opening structure shown in FIG. 3;

FIG. 7 is a schematic plan view showing a modified example of the guide member shown in FIG.

FIG. 8 is a front view showing another example of the guide member shown in FIG. 5;

FIG. 9 is a cross-sectional view for explaining a state when the lip type is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Forming apparatus 18 Eject station 20 Base 22 Turntable 60 Guide mechanism 62 Chute 64 Guide member 64A Guide main body 64B Air cylinder

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 49/00-49/80

Claims (2)

(57) [Claims] A lip mold comprising a split mold for holding a lip portion of a molded article is provided. The lip mold is used to rotate and transport the molded article to a take-out position, and the lip mold is opened at the take-out position. A molding device having a structure in which a molded product is dropped and removed by releasing the lip portion, wherein a small-diameter portion having an outer diameter insertable into the lip portion;
It is provided above the small diameter part and is larger than the diameter of the lip part.
A large-diameter portion having a large outer diameter, and before opening the lip mold, the small-diameter portion is driven to be inserted into the lip portion of the molded product held by the lip mold and set at the take-out position. An eject core for restricting a horizontal movement of the lip portion, and an eject core for movably provided at a take-out position of the molded product,
A guide member that guides the molded article to fall, and sets the guide member at a first position corresponding to a position that does not interfere with the rotational movement path of the molded article until the molded article reaches the removal position. after reaching the position above the molded article is taken out, before the lip mold is opened mold, driving means for moving to a second position facing the outer peripheral surface of the molded article, the provided, the molding The cross section of the body of the article is formed in a square shape, and the driving means moves the guide member along the horizontal direction.
To set the first and second positions, and the second position
By the guide member set at the position, the molded product
A molding device characterized by regulating rotation . 2. A comprising a lip mold consisting of split mold for holding the lip portion of the plurality of molded articles, double this lip-type
A molding apparatus having a structure in which a number of molded products are rotated and conveyed to a take-out position, the lip mold is opened at the take-out position, and a plurality of molded products are dropped and taken out by releasing the lip portion. A small-diameter portion having an outer diameter that can be inserted into the lip portion;
It is provided above the small diameter part and is larger than the diameter of the lip part.
Each having a large diameter portion having a large outer diameter and each of the plurality of molded products held at the lip mold and set at the take-out position before opening the lip mold.
The small diameter portions are inserted and driven, respectively , and the plurality of molded products are
A plurality of eject cores for restricting the horizontal movement of each of the lip portions; and a guide member movably provided at a position where the plurality of molded products are taken out, for guiding the plurality of molded products to fall. When, the guide member, until it reaches the removal position the plurality of the molded article, set in a first position corresponding to a position where it does not interfere with the rotational movement path of the plurality of molded articles, the double
After the number of molded products reach the take-out position, before the lip mold is opened, the plurality of molded products are moved to the second position facing the outer peripheral surface of each of the plurality of molded products. and driving means, provided, the guide member, the partition a dropping path of the plurality of molded articles
The drive means is formed in a box shape having a partition part, and the guide means extends along the falling direction of the molded product.
Move the member to set the first and second positions,
The height of the top of the guide member set at the second position
Is for 2 minutes of the body of the molded product held by the lip mold.
Height shifted to the lip part side from the height position
Molding device, characterized in that the.