JPH07314544A - Closing unit for hollow molding machine - Google Patents

Abstract

PURPOSE:To open/close a die through a motor-driven toggle mechanism while preventing the die from tilting or vibrating. CONSTITUTION:The closing unit for hollow molding machine comprises a die guide means 40 including a guide bar (32 and/or 33) and a guide cylinder(30, 30a and/or 31, 31a) disposed between the upper part of a rear plate 18 and the upper part of the second fixing plate 10 at the second die part 3 of a die 1 such that they slide and fitted each other. The die is opened/closed through the die guide means 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device for a hollow molding machine, and more particularly, to perform mold opening and closing via a toggle mechanism driven by an electric motor, and to prevent the mold from collapsing and swinging back during mold clamping. For new improvements for.

[0002]

2. Description of the Related Art As a mold clamping device of a hollow molding machine of this type which has been conventionally used, for example, the structure disclosed in JP-A-6-869 shown in FIGS. 25 and 26 is adopted. That is, the reference numeral 1 in FIGS. 25 and 26 is an openable / closable mold including the first mold part 2 and the second mold part 3, and the cavity 1 a of the mold 1 is extruded. The parison 6 depending from the crosshead 5 of the machine 4 is supplied.

The second mold part 3 is connected to a toggle mechanism 9 composed of a pair of bendable first and second toggle pieces 7 and 8 via a second mold holder 10 and a first clevis 7. The guide block 12 holding the shaft support 11 to which the toggle pieces 7 and 8 are flexibly connected is configured to be guided by a pair of center positioning guide bars 13 and 14.

The guide block 12 is constructed so that it can be reciprocally moved in the axial direction by a feed screw body 16 such as a ball screw rotated by an electric motor 15. The first die holder 2 is attached to the first die part 2. Is provided.

A pair of rods 1 are attached to the rear plate 18 connected to the second toggle piece 8 via the second clevis 8a.
9 and 20 are connected, and the rods 19 and 20 are fixedly connected to the connection body 21 connected to the first mold holding body 17, and the rods 19 are connected to the first mold holding body 10.
And the rear plate 18, the rods 19 and 20, and the connector 21 constitute a mold opening / closing interlocking mechanism 50 for the mold 1.

Therefore, in the above configuration, the electric motor 1
By moving 5 to move the guide block 12 with the feed screw body 16, the toggle pieces 7 and 8 become linear or bent along the positions shown by the dotted and solid lines as shown in FIG. In the case of, since the respective mold holders 10 and 17 move in a direction in which they are joined to each other via the mold opening / closing interlocking mechanism 50, the respective mold parts 2 and 3 are closed, and in the case of a refraction shape, In reverse to the above, the mold parts 2 and 3 are opened.

[0007]

Since the mold clamping device of the conventional blow molding machine is constructed as described above, there have been the following problems. In other words, the mold clamping uses a toggle mechanism and a mold opening / closing interlocking mechanism consisting of a guide bar provided between the lower part of each mold mounting plate of the mold and the rear plate. The upper part of the mold collapsed and it was impossible to perform complete mold clamping. In addition, the mold swings back and forth in the middle of the mold clamping, resulting in a reduction in the quality of the hollow molding and a reduction in the yield.

The present invention has been made to solve the above problems, and in particular, the mold is opened and closed through a toggle mechanism driven by an electric motor, and at the same time, the mold falls and swings back during mold clamping. It is an object of the present invention to provide a mold clamping device for a hollow molding machine that is designed to be resolved.

[0009]

A mold clamping device for a hollow molding machine according to the present invention uses a mold for opening and closing and clamping a parison hanging from a crosshead via a mold opening / closing interlocking mechanism provided on a transfer table. In a mold clamping device of a hollow molding machine for holding and obtaining a hollow molded product, a toggle mechanism provided between a rear plate of the mold opening / closing interlocking mechanism and a second mold part of the mold, and the toggle mechanism. A guide block provided on a shaft supporting portion of the mechanism, a feed screw body screwed into the guide block, an electric motor for rotating the feed screw body, and an upper portion of a second die mounting plate of the second die portion. And a die guide means, which is provided between the upper part of the rear plate and the rear plate and is slidably fitted to each other, the die guide means including at least a guide bar and a guide tube body, and the opening and closing of the die is performed through the die guide means. Configuration A.

More specifically, a pair of the guide cylinders are fixed to the mold mounting plate and the rear plate, respectively.
The pair of guide bars is fixed to a pair of guide bar fixing blocks fixed to the pair of guide bar fixing blocks fixed on the transfer table.

More specifically, one of the guide cylinders is the rear portion of the second die mounting plate and the guide cylinder is the second.
The guide bars are respectively provided on the rear part of the die mounting plate and the rear part of the rear plate, and one guide bar is fixed to one guide bar fixing block fixed on the rear part of the transfer table.

More specifically, one guide cylinder is provided at each of the front part of the second mold mounting plate and the front part of the rear plate, and one guide bar is provided at the front part of the transfer table. It is fixed to one guide bar fixing block fixed above.

More specifically, a pair of the guide cylinders are fixed to the second die mounting plate and the rear plate, respectively, and a pair of the guide bars are provided on the first die mounting plate. Each of the guide cylinders fixed to the cylinder and provided on the rear plate is slidable with each of the guide bars.

More specifically, one guide cylinder is provided on each of the rear portion of the second die mounting plate and the rear portion of the rear plate, and one guide bar is provided on the first die mounting plate. The guide tube body fixed to the guide tube body provided on the rear plate is slidable with each of the guide bars.

More specifically, one guide cylinder is provided at each of the front part of the second mold mounting plate and the front part of the rear plate, and each of the guide bars is the second mold mounting plate. The guide cylinder body fixed to the guide cylinder body provided on the rear plate is slidable with each of the guide bars.

[0016]

In the mold clamping device of the hollow molding machine according to the present invention, the mold guiding means including at least the guide bar and the guide cylinder is provided between the upper part of the second mold mounting plate of the mold and the rear plate. Therefore, even when the mold is clamped,
The upper part of the second mold is opened and closed by the mold guide means without shaking and completely prevents the upper part of the mold from collapsing.
It is possible to improve the molding quality and the yield.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a mold clamping device for a hollow molding machine according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example are designated by the same reference numerals for description. FIGS. 1 to 4 are the first embodiment, FIGS. 5 to 8 are the second embodiments, FIGS. 9 to 12 are the third embodiments, FIGS. 13 to 16 are the fourth embodiments, and FIGS. The fifth embodiment and FIGS. 21 to 24 show the sixth embodiment. First, Fig. 1
4 to FIG. 4, what is denoted by reference numeral 1 is an openable / closable mold including a first mold part and a second mold part 3. In the cavity 1a of the mold 1, the cloth of the extruder 4 is placed. The parison 6 hanging from the head 5 is supplied.

The second mold part 3 is connected to a toggle mechanism 9 composed of a pair of bendable first and second toggle pieces 7 and 8 via a second mold holder 10 and a first clevis 7a. The guide block 12 that holds the shaft support 11 to which the toggle pieces 7 and 8 are flexibly connected is configured to be guided by a pair of center positioning guide bars 13 and 14. Further, each of the guide bars 13 and 14 is provided on a transfer allowance 20A for transferring the mold 1.
It is held via the pair of mounting portions 21 and 22.

The guide block 12 is constructed so that it can be reciprocated in the axial direction by a feed screw body 16 such as a ball screw which is rotated by an electric motor 15 fixed to one of the mounting portions 22, and the first mold portion is provided. A second type mounting plate 17 is provided on the second unit 2.

A pair of rods 1 is attached to the rear plate 18 connected to the second toggle piece 8 via the second clevis 8a.
9 and 20 are connected, and the rods 19 and 20 are fixedly connected to the connection body 21 connected to the first die mounting 17, and the rods 19 pierce the first die mounting 10 operably. Thus, the rear plate 18, the rods 19 and 20, and the connecting body 21 constitute a mold opening / closing interlocking mechanism 50 for the mold 1. Therefore, the mold opening / closing interlocking mechanism 50 is arranged on the transfer table 20A.

Therefore, in the above configuration, the electric motor 1
By operating 5 to move the guide block 12 with the feed screw body 16, the toggle pieces 7 and 8 become linear or bent along the positions shown by the dotted and solid lines as shown in FIG. In the case of 1, since the respective mold holding bodies 10 and 17 move in a direction in which they are joined to each other via the mold opening / closing interlocking mechanism 50, the respective mold parts 2 and 3 are closed, and in the case of a bent shape. In reverse to the above, the mold parts 2 and 3 are configured to be opened.

Inside the upper part of the second mold mounting plate 10 (that is, substantially in the center of the mold 1), a pair of guide cylinders 3 are provided.
0 and 30 are fixedly provided, and the rear plate 18
A pair of guide cylinders 31, 31a are fixedly provided inside the.

A pair of guide bar fixing blocks 34 and 35 having guide bars 32 and 33 fixed thereto are provided on the mounting portions 21 and 22 of the transfer table 20, respectively.
For each guide bar 32, 33, each guide cylinder 3
0, 30a, 31, 31a are configured to be slidable.

Each of the guide cylinders 30, 30a, 31, 3
1a and each guide bar 32, 33 for the mold 1 at the time of mold clamping
Of the die guide means 40 for guiding the horizontal movement of the die guide means 40. As shown in FIG.
It is located above the second mold mounting plate 10 and above the rear plate 18.

Therefore, in the above configuration, the electric motor 1
By operating 5 to move the guide block 12 by the feed screw body 16, the toggle pieces 7 and 8 are changed from the bent state shown in FIGS. 1 and 2 to the direct state shown in FIGS. Mold 1 with mold closed and parison 6 sandwiched
Is clamped. Further, at the time of this mold clamping, the second mold mounting plate 10 is moved to the second mold by the action of the mold guide means 40.
It is possible to prevent the die part 3 from falling or swinging back.

Next, in the case of the second embodiment shown in FIGS. 5 to 8, the two guide cylinders 30 and 31 are attached to the second die mounting plate 1.
0 and the rear plate 18 are located only on the rear side (the motor 15 side is the front side when viewed in the plan view of FIG. 5), and one guide bar 32 and one guide bar fixing block 34 are provided.
Is used. Since other parts are the same as those in the above-mentioned embodiment,
The same parts are designated by the same reference numerals and the description thereof will be omitted.

Next, in the case of the third embodiment shown in FIGS. 9 to 12, the two guide cylinders 30a and 31a are located only on the front side of the second mold mounting plate 10 and the rear plate 18,
One guide bar 33 and one guide bar fixing block 35 are used. Since other parts are the same as those in the above-described embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Next, in the case of the fourth embodiment shown in FIGS. 13 to 16, the two guide cylinders 30 and 30a are fixed inside the second die mounting plate 10, and the two guide cylinders are fixed. Three
1, 31a are provided inside the rear plate 18 as a pair, and are provided between the guide cylinders 30, 31 and 30.
Guide bars 32 and 33 are slidably fitted between a and 31a, and the guide cylinders 30, 30a, 31, and 31a are horizontally arranged in the direction of the arrow via the guide bars 32 and 33, respectively. It is configured to be mobile. Therefore, the configuration different from the first embodiment is that the guide bar fixing blocks 34 and 35 are not used. Since the other parts are the same as those in the above-described embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Next, in the case of the fifth embodiment shown in FIGS. 17 to 20, the second type mounting plate 10 is modified in the modification of the fourth embodiment.
And a configuration using two guide cylinders 30, 31 and one guide bar 32 only on the rear side of the rear plate 18,
Since other parts are the same as those in the above-described embodiment, the same parts are designated by the same reference numerals, and the description thereof will be omitted.

Next, in the case of the sixth embodiment shown in FIG. 21 to FIG. 24, the second type mounting plate 10 is a modification of the fourth embodiment.
And a configuration using two guide cylinders 30a, 31a and one guide bar 33 only on the front side of the rear plate 18, and since the other parts are the same as the above-mentioned embodiment, The same reference numerals are given and the description thereof is omitted.

[0031]

The mold clamping device of the blow molding machine according to the present invention comprises:
Since it is configured as described above, the following effects can be obtained. That is, the second die is provided via the die guide means including at least the guide bar and the guide cylinder provided between the second die mounting plate provided on the second die part and the rear plate.
Since the mold clamping operation of the mold part is performed, the mold collapses during mold clamping, and the lateral swingback of the mold that occurs during mold clamping is reduced.
It is possible to improve the molding accuracy and the yield.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a mold clamping device of a hollow molding machine according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of the mold of FIG. 1 when the mold is opened.

FIG. 4 is a front view of the mold of FIG. 1 when the mold is closed.

FIG. 5 is a plan view showing a second embodiment.

FIG. 6 is a front view of FIG.

7 is a plan view of the mold of FIG. 5 when the mold is opened.

FIG. 8 is a front view of the mold of FIG. 5 when the mold is opened.

FIG. 9 is a plan view showing a third embodiment.

FIG. 10 is a front view of FIG. 9.

FIG. 11 is a plan view of the mold of FIG. 5 when the mold is closed.

FIG. 12 is a front view of the mold of FIG. 9 when the mold is opened.

FIG. 13 is a plan view showing a fourth embodiment.

FIG. 14 is a front view of FIG.

FIG. 15 is a plan view of the mold of FIG. 13 when the mold is closed.

16 is a front view of the mold of FIG. 13 when the mold is closed.

FIG. 17 is a plan view showing a fifth embodiment.

FIG. 18 is a front view of FIG. 17.

FIG. 19 is a plan view of the mold of FIG. 17 when the mold is closed.

20 is a front view of the mold of FIG. 17 when the mold is closed.

FIG. 21 is a plan view showing a sixth embodiment.

22 is a front view of FIG. 21. FIG.

FIG. 23 is a plan view of the mold of FIG. 21 when the mold is closed.

FIG. 24 is a front view of FIG. 21 when the mold is closed.

FIG. 25 is a plan view showing a conventional mold clamping device.

FIG. 26 is a front view of FIG. 25.

[Explanation of symbols]

 1 Mold 3 Second Mold Section 5 Cross Head 6 Parison 9 Toggle Mechanism 10 Second Mold Mounting Plate 12 Guide Block 18 Rear Plate 20A Transfer Stage 30, 30a, 31, 31a Guide Cylindrical Body 32, 33 Guide Bar 34, 35 Guide bar fixed block 40 Mold guide means

Claims (7)

[Claims] 1. A parison (6) hanging from a crosshead (5) is held by a mold (1) which is opened and closed and clamped via a mold opening and closing interlocking mechanism (50) provided on a transfer table (20A). In a mold clamping device of a hollow molding machine for obtaining a hollow molded product, a rear plate (18) of the mold opening / closing interlocking mechanism (50) and a second mold part (3) of the mold (1).
A toggle mechanism (9) provided therebetween, a guide block (12) provided on a shaft support (11) of the toggle mechanism (9), and a feed screw body (16) screwed into the guide block (12). ), An electric motor (15) for rotating the feed screw body (16), an upper part of the second mold mounting plate (10) of the second mold part (3), and the rear plate (18).
And a guide bar (32 or 33, or both) and a guide tube (30 or 30a, 31 or 31a or any or all of them) which are slidably fitted to each other. Means (40), the mold (5
A mold clamping device for a hollow molding machine, characterized in that the opening and closing of 1) is performed through the mold guide means (40). 2. A pair of the guide cylinders (30 and 30a or 31 and 31a) are fixed to the second mold mounting plate (10) and the rear plate (18) respectively, and a pair of the guide bars ( The hollow molding machine according to claim 1, wherein (30 and 30a) or (31 and 31a) are fixed to a pair of guide bar fixing blocks (34, 35) fixed on the transfer table (20A). Mold clamping device. 3. One of the guide cylinders (30) includes a rear portion of the second mold mounting plate (10) and the rear plate (1).
8) is provided at the rear of each of the guide bars (3).
2. The mold clamping device for a hollow molding machine according to claim 1, wherein 2) is fixed to one guide bar fixing block (34) fixed on the rear part of the transfer table (20A). 4. One of the guide cylinders (30a) includes a rear portion of the second die mounting plate (10) and the rear plate (1).
8) provided on the front part of each of the guide bars (3)
The mold clamping device for a hollow molding machine according to claim 1, wherein 3) is fixed to one guide bar fixing block (35) fixed on all of the transfer table (20A). 5. A pair of guide cylinders (30, 30a, 31 and 31a) are fixed to the second mold mounting plate (10) and the rear plate (18), respectively, and a pair of guide bars (32). , 33) is fixed to the guide cylinders (30, 30a) provided on the second type mounting plate (10),
The guide cylinders (31, 31a) provided on the rear plate (18) are the guide bars (32, 33).
It is configured to be slidable with
A mold clamping device for the hollow molding machine described. 6. One guide cylinder (30 and 31) is provided at each of a rear portion of the second mold mounting plate (10) and a rear portion of the rear plate (18), and one guide bar (30) is provided. 32) is fixed to the guide cylinder (30) provided on the second type 2 mounting plate (10), and the guide cylinder (31) provided on the rear plate (18) is the guide bar. The mold clamping device for a hollow molding machine according to claim 1, wherein the mold clamping device is slidable with respect to (32). 7. One of said guide cylinders (30 and 31a)
Are respectively provided on the front part of the second mold mounting plate (10) and the front part of the rear plate (18), and one guide bar (33) is mounted on the second mold mounting plate (10). The guide cylinder (31a) fixed to the guide cylinder (30a) and provided on the rear plate (18) is configured to be slidable with each of the guide bars (33). The mold clamping device of the blow molding machine according to claim 1.