JPH044122A - Bracket forming device for blow molded product - Google Patents

Abstract

PURPOSE:To set up arbitrarily an angle of a bracket to be formed on a blow molded product, by a method wherein a pinching and holding means is formed freely turnably centering around its center shaft and the pinching and holding means is turned by arranging a cylinder mechanism concentrically with the pinching and holding means. CONSTITUTION:When a parison 6 is held within a cavity 2 of a mold 1, a pinching and holding means 21 is moved forward along with a rod 24 of a moving cylinder mechanism 23 by driving of the moving cylinder mechanism, projected into the cavity 2 and approached to the parison 6. Then the front of the pinching and holding means 21 is opened, the front tips of its both chuck bodies are encroached upon the parison 6 under a state where both the chuck bodies 27 abut against a circumferential surface of a through hole 15 of a case cap 12. Continuously, after the front of the pinching and holding means 21 is closed and part of the parison 6 is put into the pinching and holding means 21, the moving cylinder mechanism 23 is operated, the pinching and holding means 21 is moved backward along with its rod 24, held into a case 11 and the pinching and holding means 21 becomes a state where the front of the same coincides with a cavity surface. Air is blown into the parison 6 under this state, blow molding is performed and molded product 7 is produced. Thus a bracket 8a is formed on the molded product 7 at a part where it is caught by the pinching and holding means 21.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a bracket forming apparatus for blow molded products, and in particular, the present invention relates to a bracket forming apparatus for a blow molded product, and in particular, a parison is formed by a clamping tool that is movable from the cavity surface of a mold into the cavity. A bracket is formed by sandwiching a part of the bracket.

(Prior Art) As a conventional bracket forming apparatus for blow-molded products, for example, one described in Japanese Patent Application Laid-Open No. 64-55221 is known. In the apparatus described in this publication, a clamping tool for clamping a part of the parison to form a bracket is provided in a cylindrical case that is assembled into a blow molding mold. This clamping tool is composed of a pair of arm bodies connected by a support shaft so as to be rotatably openable and closable, and chuck bodies each pivotally attached to the distal ends of these arm bodies.

A tensioning means made of a wire that clamps these chuck bodies, the above-mentioned support shaft, and an air cylinder mechanism that moves the clamping tool back and forth in the axial direction of the case via this support shaft are arranged in parallel within the case. The gripping tool is positioned offset from the central axis of the case facing the parison.

(Problem to be Solved by the Invention)' However, in the conventional structure described above, when the case is rotated to change the angle at which the bracket is formed on the molded product, not only does the angle of the clamping tool change; Since this clamping tool revolves around the central axis of the case, there is a problem that even the position of the clamping tool changes.

Therefore, so that the clamping tool is located on the central axis of the case,
It is possible to install a clamping tool inside this case, but
If this is done, the expansion means, the support shaft, and the air cylinder mechanism are located in parallel in the case as described above, so the case becomes unnecessarily large.

The present invention aims to solve the above-mentioned problems, and it is possible to arbitrarily set the angle of the bracket without changing the position where the bracket is formed on the blow-molded product, and also to create a blow molded product that can be made smaller. The object of the present invention is to provide a bracket forming apparatus for molded products.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a bracket that is provided so as to be movable forward and backward from the cavity surface of a mold 1 for blow molding into the cavity 2, and to sandwich a part of the parison 6. 8g,
holding tools 21 and 61 forming 8b, 8c, and 8d;
A cylinder mechanism 23 that moves the clamping tools 2+ and 61 forward and backward.
．． 63, the clamping tool 21.61 is formed to be rotatable around its central axis, and the cylinder mechanism 23 is coaxially with the clamping tool 2], 61. .63 is arranged.

(Function) In the apparatus for forming a bracket for a blow-molded product of the present invention, the blow-molded product 7 is provided with brackets 8a, 8b, and 8c.

8d, the cylinder mechanism 23.63 disposed coaxially with the clamping tools 2+, 6]
From the cavity surface of the clamping tool 21°61 into the cavity 2
After moving the clamping tool 21.6+ forward to clamp a part of the parison 6 inside the cavity 2, the clamping tool 21.6+
1 is retreated again to the cavity surface, and blow molding is performed in this state. In this way, the brackets 8a, 8b, 8 are attached to the molded product 7 at the portions clamped by the clamping tools 21°61.
c, 8d are formed. Thereafter, the clamping tool 21°61 is moved to the cylinder mechanism 23. 63 into the cavity 2, and the bracket 83. of the molded product 7 is opened.
After separating it from 8b, 8c, and 8d, it is retreated again from inside the cavity 2. Bracket 8 like this! .

When forming brackets 8b, 8c, and 8d,
a, 8b.

To set the angles 8c and 8d, use the clamping tool 21.61.
All you have to do is rotate it around its central axis, and by doing so,
Bracket 8! , 8b, 8c, and 8d remain constant, and bracket 8! , 8b,
The angles 8c and 8d are set arbitrarily.

(Example) Hereinafter, a first example of the apparatus for forming a bracket for a blow-molded product according to the present invention will be described with reference to FIGS. 1 to 10.

In FIGS. 1 and 4, 1 is a mold for blow molding, 2 is a cavity of this mold 1, and 3 is a cavity 2 of this mold.
This is the nozzle attachment part for blowing air into. In addition, mold 1
Although there is a pair, only one is shown in the drawing. In addition, in FIGS. 5 to 10, 6 is a parison, 7 is a hollow molded product made by blow molding this parison, and 8L
8b is a bracket formed on this blow molded product 7.

Further, as shown in FIG. 1 in particular, a cylindrical mounting hole 10 is formed through the mold 1 so as to face the cavity 2. A case 11 of the bracket forming device is rotatably fitted into the mounting hole 10. This case 11 has a cylindrical shape, and openings at both ends are closed by case caps 12 and 13, respectively. The front surface of one of the case caps 12 forms a part of the cavity surface, that is, the surface of the cavity 2. Furthermore, guide grooves 14 are formed on both sides of the inner circumference of the case 11, respectively. Furthermore, the case caps 12 and 13 have a through hole 15 in the center. 16 are formed respectively. In the following description, the axial direction of the case 11 is taken as the front-rear direction, and one case cap 1
The second side is the front side.

The case 11 includes a clamping tool 21 that advances and retreats from the cavity surface into the cavity 2 and clamps a part of the parison 6 to form a bracket 838b;
An opening/closing cylinder mechanism 22 for opening and closing the holding tool 1, and an advancing/retracting cylinder mechanism 23 for moving the holding tool 21 forward and backward are provided.

The advancing/retracting cylinder mechanism 23 has a main body fixed to the back surface of the case cap 13 on the rear side, and a rod 2 which is prevented from rotating and moves back and forth on the central axis of the case 11.
4 is connected to the case 1 through the through hole 16 of the case cap 13.
It is protruded inward. In addition, the opening/closing cylinder mechanism 2
2, the main body portion is the rod 2 of the cylinder mechanism 23 for advancing and retreating.
4, and the above-mentioned case II.
It has a rod 25 that moves back and forth on the central axis.

Further, the clamping tool 21 includes a pair of chuck bodies 27 connected to each other by a support shaft 26 so as to be rotatable and openable, and are inserted into the through hole 15 of the case cap 12 on the front side. Both ends of the support shaft 26 are connected to the case l through a shaft 28 made of a rotatable ball bearing.
The guide grooves 14 are inserted into the guide grooves 14 on both sides of the inside.

Further, a substantially U-shaped first link 29 is fixed to the rod 25 of the opening/closing cylinder mechanism 22 located inside the case 11. As shown in FIG. 2, one end side of a pair of second links 30 is rotatably supported by a support shaft 31 at the image end of this link 29.
The other end side of these second links 30 or both chuck bodies 2
7 are rotatably connected to the rear portions of the members 7 by support shafts 32, respectively.

Note that the rod 25 of the opening/closing cylinder mechanism 22 is connected to the clamping tool 2.
When moving forward and backward to open and close 1, this rod 25 and link 29. , 30 is caused by the movement of the support shaft 26 of the clamping tool 21.
It is designed so that it does not affect the progress or retreat of. Clamping tool 2 when the rod 25 of this opening/closing cylinder mechanism 22 moves back and forth.
In order to prevent the support shaft 26 of the clamping tool 21 from moving back and forth, for example, the support shaft 26 of the clamping tool 21 may be supported by an arm (not shown) fixed to the main body of the opening/closing cylinder mechanism 22.
The case 11 may be provided with a movement stopper.

As is clear from the above description, both the cylinder devices 22 and 23 and the clamping tool 21 are arranged in a line on the central axis of the case 11. Moreover, by rotating the case 11, the clamping tool 21 can be rotated about its central axis.

Next, the operation of the above device will be explained.

During blow molding, after the parison 6 is lowered from the molding machine into a pair of molds 1, the mold 1 is moved forward and clamped, and the parison 6 is stored in the cavity 2 of the mold 1. Ru. At this time, the clamping tool 21 moves forward together with the rod 24 by driving the advancing/retracting cylinder mechanism 23.
This clamping tool 21 protrudes into the cavity 2 and holds the parison 6.
approach and prepare to open. Incidentally, the rollers 28 also move forward along the guide groove 14, and the clamping tool 21 moves forward until these rollers 28 come into contact with the case cap 12, as shown by chain lines in FIG.

Next, as shown in FIG. 5, the opening/closing cylinder mechanism 22
, the rod 25 and the first link 2 are driven.
9 is pushed forward. At this time, the support shaft 26 of the clamping tool 21 cannot move forward due to the contact of the rollers 28 with the case cap 12. Therefore, the second links 30 fall backward around the support shaft 31, and while these second links 30 rotate around the support shaft 32 relative to both chuck bodies 27, the two chuck bodies 27 The rear parts are pulled together. As a result, the front part of the clamping tool 21 located in the cavity 2 opens, and both chuck bodies 27 thereof are opened.
comes into contact with the circumferential surface of the through hole 15 of the case cap 12. In this state, the front tips of both chuck bodies 27 bite into the parison 6.

From this state, as shown in FIG. 6, the opening/closing cylinder mechanism 22 is activated again, and the rod 25 and first link 29 are retracted. At this time, the initial side chuck body 27
Since it is in contact with the circumferential surface of the through hole 15, the support shaft 26 of the clamping tool 21 cannot be moved back. Therefore, contrary to the above, the second link 30 rises forward about the support shaft 31, and the rear portions of both chuck bodies 27 are separated from each other. Therefore, the front part of the clamping tool 21 is closed, and a part of the parison 6 is clamped by the front part of the clamping tool 21.

Next, as shown in FIG. 7, the advancing/retracting cylinder mechanism 23
is activated, the clamping tool 21 is moved back together with the rod 24, and the entire clamping tool 21 is accommodated in the case 11, so that the front surface of the clamping tool 21 is aligned with the cavity surface.

In this state, air is blown into the parison 6, blow molding is performed, and a molded product 7 is produced.

When blow molding is completed, the mold is opened and at the same time,
As shown in FIG. 8, the advancing/retracting cylinder mechanism 23 is operated, and the clamping tool 21 moves forward together with the rod 24 thereof. Further, the opening/closing cylinder mechanism 22 is activated and its rod 25 moves forward, thereby opening the clamping tool 21 and separating it from the bracket 83 of the molded product 7.

In this way, the bracket 8 is attached to the molded product 7 at the part that was held by the clamping tool 21! is formed.

Note that after that, the clamping tool 21 is closed again and retreated from the cavity 2 by the cylinder mechanisms 22 and 23.

Bracket in such blow molded product 7) 8! , 8
In forming the bracket 8a, the bracket 8a is formed by rotating the case 11 about its central axis relative to the mold 1, as shown in FIGS. 9 and 10.
The angle of 8b can be arbitrarily selected. That is, when the case 11 is rotated, the clamping tool 21 is rotated together with the case 11, and the arrangement direction of the pair of chuck bodies 27 of the clamping tool 2) changes arbitrarily, and the bracket 8a,
The angle of 8b can be changed arbitrarily. At this time, since the clamping tool 21 is located concentrically with the case 11, the clamping tool 21 rotates about its own central axis as the case 21 rotates. Therefore, the clamping tool 21
Even when the brackets 8a and 8b rotate, their positions do not change, and the brackets 8a and 8b are formed at fixed positions in the molded product 7. That is, the bracket 8a is attached to the blow molded product 7,
The angles of the brackets 8a, 8b can be set arbitrarily without changing the position where the brackets 8b are formed.

Further, according to the above configuration, the clamping tool 21 and the cylinder mechanism 2
2 and 23 are arranged coaxially, the case 11 can be made thinner and smaller.

FIG. 11 shows a second embodiment of the present invention. In this embodiment, portions of both chuck bodies 27 of the clamping tool 2I that form the brackets 8C are fitted together when the clamping tool 21 is closed. A convex portion 36 and a concave portion 37 are respectively provided. These convex portions 36 and concave portions 37 allow the first bracket 8C to be formed simultaneously with the formation of the bracket 8C.
A hole 38 as shown in FIG. 2 can be formed, and even if the hole 38 is required in the bracket 8C, drilling by secondary processing can be made unnecessary.

FIG. 13 shows a third embodiment of the present invention. In this embodiment, over the entire width of the portion forming the bracket 8d of both chuck bodies 27 of the clamping tool 21,
Protrusions 41 are provided that face each other in close proximity when the clamping tool 21 is closed. These protrusions 41 allow the bracket 8d
At the same time as the bracket 8d is formed, a thin hinge portion 42 as shown in FIG. 14 can be formed on the bracket 8d. Of course, one bracket 8d has a plurality of thin hinge parts 42.
can also be formed. In this way, by providing the thin hinge portion 42 on the bracket 8d, the bracket 8d
The degree of freedom of deformation can be increased.

Next, a fourth embodiment of the present invention will be described based on FIGS. 15 and 16. Note that the same reference numerals are given to the parts corresponding to those in the previous embodiment, and the explanation thereof will be omitted.

In this embodiment, a case 11 is not provided, and a clamping tool 21 and an opening/closing cylinder mechanism 22 are placed in a cylindrical storage hole 50 formed through the mold 1 facing the cavity 2.
are stored directly. Further, a back plate 51 is fixed to the back side of the mold 1 on the opposite side from the cavity 2 with bolts 52, etc., and the main body of the advancing/retracting cylinder mechanism 23 is attached to the back side of this back plate 51. The main body of the opening/closing cylinder mechanism 22 is fixed to the tip of the rod 24 of the advancing/retracting cylinder mechanism 23 that passes through the back plate 51 . The advancing/retracting cylinder mechanism 23 is rotatable about its central axis with respect to the upper back plate 51. As a result, the above-mentioned advancing/retracting cylinder mechanism 2
3, an opening/closing cylinder mechanism 22 and a clamping tool 21, which are arranged coaxially with the advancing/retracting cylinder mechanism 23, are rotatable about their central axis.

As in the previous embodiment, an arm (not shown) fixed to the opening/closing cylinder mechanism 22 is used to prevent the support shaft 26 of the clamping tool 21 from moving back and forth when the rod 25 of the opening/closing cylinder mechanism 22 moves back and forth. ) may be such that the support shaft 26 of the clamping tool 21 is pivotally supported.

In the apparatus of this fourth embodiment, the advancing and retreating and opening/closing steps of the clamping tool 21 during molding are the same as in the previous embodiment.

However, when the rod 25 of the opening/closing cylinder mechanism 22 moves forward, the front part of the clamping tool 21 closes, and when the rod 25 of the opening/closing cylinder mechanism 22 retreats, the front part of the clamping tool 21 opens.

When molding a blow molded product, by rotating the advance/retreat cylinder mechanism 23 and rotating the clamping tool 21 around its central axis, the bracket can be formed in the blow molded product without changing the position. The angle of this bracket can be set arbitrarily.

Next, a fifth embodiment of the present invention will be described based on FIGS. 17 to 19.

In this embodiment, as in the fourth embodiment, a clamping tool 61 and a cylinder mechanism 62.
63 is directly stored. Further, a back plate 64 is attached to the back surface of the mold 1 on the side opposite to the cavity 2, and the main bodies of the cylinder mechanisms 62 and 63 are fixed to the front surface of this back plate 64. Here, the advancing/retracting cylinder mechanism 63 is located on the central axis of the storage hole 60 , and the pair of opening/closing cylinder mechanisms 62 are located around the storage hole 60 .

A U-shaped link 66 is fixed to the tip of the rod 65 of the advancing/retracting cylinder mechanism 63, and a pair of chuck bodies 67 of the clamping tool 61 are attached to the tip of the link 66 by a pivot shaft 68 to open and close the pair. freely supported. Also,
Roller accommodating cases 69 are fixed to both ends of the support shaft 68, and ball-shaped advancing/retracting rollers 70 are rotatably supported within these roller accommodating cases 69, respectively. These advancing and retracting rollers 70 are connected to the storage hole 60.
They are in contact with each other and can be transferred freely. Note that, at the rear portions of both chuck bodies 67 of the clamping tool 61, a receiving portion 71 is formed, which opens when the front portion of the clamping tool 61 is closed.

Further, substantially U-shaped links 73 are fixed to the ends of the rods 72 of the double opening/closing cylinder mechanisms 62, respectively. At the tips of these links 73, ball-shaped opening/closing rollers 75 housed in a roller housing case 74 are rotatably supported by support shafts 76, and these opening/closing rollers 75 are attached to the housing holes 60. and both side surfaces of both chuck bodies 67 in a movable manner.

Further, the back plate 64 is rotatable about the central axis of the storage hole 60. Therefore, by rotating the back plate 64, the advancing/retracting cylinder mechanism 63 and the clamping tool 61 disposed coaxially therewith can be rotated about its central axis. In addition, the double advancing/retracting roller 70 and the double opening/closing roller 7
5 are located symmetrically about the central axis of the storage hole 60, and continue to contact the circumferential surface of the storage hole 60 even when the back plate 64 rotates.

In the apparatus of this fifth embodiment as well, the advancing and retreating and opening/closing steps of the clamping tool 61 during molding are the same as in the previous embodiment.

At this time, as shown by solid lines in FIG. 17, when the rods 65, 72 of all the cylinder mechanisms 62, 63 are in a retracted state, the clamping tool 61 is retracted, and the front part of this clamping tool 61 is Closed. From this state, when the rod 65 of the advancing/retracting cylinder mechanism 63 is advanced, the clamping tool 61 moves forward while the advancing/retracting rollers 70 shift in the axial direction on the circumferential surface of the storage hole 60 . Along with this, both opening/closing rollers 75 push the receiving portions 71 of both chuck bodies 67 of the clamping tool 61 relatively backward, as shown by chain lines in the same figure and solid lines in FIG. Both chuck bodies 67 rotate about the support shaft 68 so that the receiver portion 71 closes, and the front portion of the clamping tool 61 protruding into the cavity 2 opens.

Next, as shown by the chain line in FIG. 18, when the rod 72 of the double-opening cylinder mechanism 62 is advanced, the double-opening/closing rollers 75 push the open front portions of the chuck bodies 67 forward, respectively. Both chuck bodies 67 rotate in the opposite direction, and the front portion of the clamping tool 61 closes. From this state, the rod 6 of the advancing/retracting cylinder mechanism 63 and the double opening/closing cylinder mechanism 62 is
5.72, the clamping tool 61 is retracted while the front part of the clamping tool 61 remains closed.

Then, when forming a blow-molded product, by rotating the back plate 64 and rotating the clamping tool 61 around its central axis, the bracket can be formed without changing the position where the bracket is formed on the blow-molded product. The angle can be set arbitrarily.

〔Effect of the invention〕

According to the present invention, in an apparatus for forming a bracket for a blow-molded product, which includes a clamping tool that clamps a part of a parison to form a bracket, and a cylinder mechanism that moves the clamping tool forward and backward, The bracket is formed to be rotatable in the center, and the cylinder mechanism is arranged coaxially with this clamping tool, so that by rotating the clamping tool, the bracket can be attached to the blow molded product without changing the position where the bracket is formed. The angle can be set arbitrarily, and the entire device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a horizontal sectional view showing a first embodiment of the bracket forming apparatus for blow molded products of the present invention, Fig. 2 is a side view of the same partially cut away, and Fig. 3 is a direction shown in Fig. 2 of the above. 4 is a perspective view of the same mold as above, FIGS. 5 to 8 are longitudinal sectional views showing the operation of same as above, FIGS. 9 and 10 are perspective views of the blow molded product as above, and FIG. Fig. 11 is a sectional view of a part of a clamping tool showing a second embodiment of the present invention, Fig. 12 is a perspective view of a part of the same blow-molded product, and Fig. 13 is a clamping tool showing a third embodiment of the invention. 14 is a perspective view of a part of the blow-molded product, FIG. 15 is a sectional view showing the fourth embodiment of the present invention, and FIG. 17 and 18 are cross-sectional views showing the fifth embodiment of the present invention, and FIG. 19 is a front view of FIG. 17 as seen from the X direction. 1. Mold, 2. Cavity, 6. Parison, 7.
・Blow molded product, 8a, 8b, 8c, 8d・Bracket, 2], 6]...Clipper, 23.63...Cylinder mechanism for advancing and retracting. 1 Ibemachikari

Claims (1)

[Claims] (1) A clamping tool that is provided to be movable from the cavity surface of a blow molding mold into the cavity and that clamps a part of the parison to form a bracket, and a cylinder mechanism that moves this clamping tool back and forth, 1. A bracket forming apparatus for a blow-molded product, characterized in that a tool is formed to be rotatable about its central axis, and the cylinder mechanism is disposed coaxially with the holding tool.