JP2911364B2 - Mold clamping device for blow molding machine - Google Patents

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 a novel improvement for completely cutting burrs by clamping with a mold clamping means after clamping.

[0002]

2. Description of the Related Art Conventionally, as a mold clamping device for a hollow molding machine of this kind, for example, the structure of Japanese Patent Application Laid-Open No. 6-869 shown in FIGS. 5 and 6 is employed. That is, what is denoted by reference numeral 1 in FIGS.
The mold 1 is an openable and closable mold comprising a mold part 2 and a second mold part 3. A parison 6 hanging from a crosshead 5 of an extruder 4 is supplied into a cavity 1 a of the mold 1. It is configured.

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

The guide block 12 is configured to be able to reciprocate in the axial direction by a feed screw 16 such as a ball screw which is rotated by an electric motor 15, and the first die 2 is provided with a first die holder 17. Is provided.

[0005] A pair of rods 1 is mounted on a rear plate 18 connected to the second toggle piece 8 via a second clevis 8a.
9 and 20 are connected, and each rod 19 and 20 is fixedly connected to a connecting body 21 connected to the first mold holder 17, and this rod 19 is connected to the first mold holder 10.
Operatively penetrates, and the rear plate 18, the rods 19 and 20, and the connecting body 21 constitute a mold opening / closing interlocking mechanism 50 of the mold 1.

Accordingly, in the above-described configuration, the electric motor 1
5 is operated to move the guide block 12 with the feed screw body 16, so that the toggle pieces 7, 8 become linear or bent along the positions shown by the dotted and solid lines as shown in FIG. In the case of (1), the mold holding bodies 10 and 17 move in the direction of joining with each other via the mold opening / closing interlocking mechanism 50, so that the mold sections 2 and 3 are closed. The mold parts 2 and 3 are in the mold open state in reverse to the above.

[0007]

The conventional mold clamping device for a blow molding machine has the following problems because it is constructed as described above. That is, when a bottle with a handle 102 as shown in FIG. 7 is molded, since the engineering plastic such as polyethylene terephthalate (PET) or polycarbonate (PC) has a high melting point, the resin is sandwiched by the mold 1. When pressed, the resin is immediately cooled and solidified to lose fluidity, so that even when a mold clamping force is applied, the burrs 101 do not easily escape to the outside of the mold as shown in FIG. The burr 101 could not be cut without hitting 200. Further, in the bottle with handle 102, the upper burr 102a and the lower burr 10a are provided.
Since there is a large difference in the cut length of 2b, lower burr 102
Since the cutting force of the upper burr 102a, that is, the mold clamping force is required to be about 2.5 to 3 times more than the cutting force of b, a uniform mold clamping force is not applied to the upper and lower portions of the mold. As shown in the figure, the upper portion of the mold 1 was opened due to the long cutting length of the upper burr 102a, and there was a problem that the upper burr 102a could not be completely cut. Accordingly, at present, the deburring is manually performed with a knife, which is time-consuming and costly, and is extremely dangerous because the knife is used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, a hollow in which burrs are completely cut by clamping the mold by a clamping additional means after clamping. An object of the present invention is to provide a mold clamping device for a molding machine.

[0009]

According to the present invention, there is provided a mold clamping apparatus for a blow molding machine, wherein a parison hanging from a crosshead is opened and closed and mold clamped via a mold opening / closing interlocking mechanism, and first and second mold holders. In a mold clamping device of a hollow molding machine which is held by a mold held by a mold to obtain a hollow molded product, the mold clamping device is provided in any one of the mold holders so as to be freely movable in a vertical direction via a driving means. A fixed locking device having a movable locking shaft having a first tapered portion, and a hook portion having a second tapered portion in a downward opening portion provided on any of the mold holders and in contact with and sliding with the first tapered portion. A hook, and the movable locking shaft and the fixed hook constitute a mold-clamping addition means, wherein the mold-clamping addition means is disposed at one or more positions on both sides orthogonal to the mold opening / closing direction of the mold; Movable locking shaft The axial direction of the mold is disposed in parallel with the parting line of the mating portion of the mold, and the operation of the driving means adds the upper or lower mold clamping of the mold through the respective tapered portions. This is the configuration.

[0010]

In the mold clamping device for a blow molding machine according to the present invention, after the mold holding the parison is clamped by the mold opening / closing interlocking mechanism, the movable locking shaft of the mold clamping adding means is engaged with the fixed hook. By doing so, the upper portions of the respective mold portions of the mold are additionally clamped to each other, and this additional tightening enables complete deburring by the bite cutting blade of the mold.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a mold clamping device for a blow molding machine according to the present invention will be described below in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. In FIG. 1 and FIG. 2, what is indicated by reference numeral 1 is an openable and closable mold comprising a first mold part 2 and a second mold part 3, and an extruder 4 is provided in a cavity 1a of the mold 1.
Is configured to be supplied with a parison 6 that hangs from the crosshead 5.

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

The guide block 12 is configured to be able to reciprocate in the axial direction by a feed screw 16 such as a ball screw which is rotated by an electric motor 15, and the first mold 2 is provided with a first mold holder 17. Is provided.

A pair of rods 1 is provided on a rear plate 18 connected to the second toggle piece 8 via a second clevis 8a.
9 and 20 are connected, and each rod 19 and 20 is fixedly connected to a connecting body 21 connected to the first mold holder 17, and this rod 19 is connected to the first mold holder 10.
Operatively penetrates, and 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, in the above-described configuration, the electric motor 1
5 is operated to move the guide block 12 with the feed screw body 16, so that the toggle pieces 7, 8 become linear or bent along the positions shown by the dotted and solid lines as shown in FIG. In the case of (1), the mold holding bodies 10 and 17 move in the direction of joining with each other via the mold opening / closing interlocking mechanism 50, so that the mold sections 2 and 3 are closed. Conversely to the above, each of the mold parts 2 and 3 is configured so as to be opened around the parting line 300.

Next, a driving means 61 such as an air cylinder is provided on the first mold holder 17 via a mounting plate 60, and the movable locking shaft 6 of the driving means 61 is provided.
The movable locking shaft 6 is guided upward and inward via a bush 63 of the mounting plate 60.
A first tapered portion 62a is formed on the inner side of the upper part of 2. The movable locking shaft 62 and the fixed hook 70 can be attached to any of the mold holders 10 and 17 described above. The axial direction of the locking shaft 62 is arranged parallel to the parting line 300 at the mating portion of the mold 1, that is, orthogonal to the mold opening and closing direction of the mold 1. In addition, the aforementioned fixed hook 70,
Mold-clamping addition means 10 for performing mold-clamping addition after mold-clamping by the movable locking shaft 62 and the driving means 61
0. In addition, this mold clamping addition means 100
As shown in FIG. 2, a pair is provided at the upper side of the mold 1 and at both side positions orthogonal to the mold opening and closing direction of the mold 1.

The second mold holder 10 is provided with a fixed hook 70 having a hook-like shape and having a downwardly open portion 70c, and the inside of the hook portion 70a of the fixed hook 70 is in contact with the first tapered portion 62a. A second tapered portion 70b is formed.

Next, the operation will be described. First, when the mold 1 is closed, the electric motor 1 of the mold opening / closing interlocking mechanism 50 is closed.
By operating the toggle mechanism 9 to change the toggle mechanism 9 from the bent state shown in FIG. 2 to a linear state, the mold 1 sandwiching the parison 6 hanging from the crosshead 5 is clamped (in this case, the mold clamping means 100). Is in the state of FIG. 4 to FIG. 3)
Then, when the driving means 61 is operated to cause the movable locking shaft 62 to protrude upward as shown in FIGS. 4 to 3, the first and second tapered portions 62a and 70b come into contact with and engage with each other, and The upper mold is added (increased).

Therefore, in this case, each mold clamping addition means 100
As a result, the respective upper contact surfaces of the mold 1 are uniformly clamped, so that the upper mold 1 does not open as shown in FIG. 8 and, as shown in FIG. The burr 101 is completely cut by the bite cutting blade 200.

When the mold 1 is to be opened, on the contrary, the driving means 61 of each mold-clamping addition means 100 is operated to retract the movable locking shaft 62 downward, and the tapered portions 62a and 70b are opened. After releasing the engagement, the mold 1 can be opened by deforming the toggle mechanism 9 so that the toggle pieces 7 and 8 are bent as shown by dotted lines in FIG.

In the above-described embodiment, the case has been described where each of the mold-clamping addition means 100 is constituted by the fixed hook 70 and the movable locking shaft 62 which are engaged via the respective tapered portions 62a and 70b. The movable locking shaft 62 may be a square shaft with a tapered surface, or a round shaft with a tapered surface. The taper portion of the fixed hook 70 may be any of a hook, a square hole taper, and a round hole taper. Further, the driving means 61 may be any of an air cylinder, a motor and a screw, a motor and a rack pinion, and a hydraulic cylinder.

[0022]

According to the present invention, a mold clamping device for a blow molding machine is provided.
With the above configuration, the following effects can be obtained. That is, since the upper part of the mold is added (increased) by means of the additional mold clamping means, there is no burring defect due to mold opening of the upper part of the mold, which has conventionally occurred, and an engineering plastic resin such as PET or PC is used. At this point, the burr cut is complete. In the bottle with handle,
Since the length of the burr can be cut and the burr can be cut off, it is not necessary to cut off the burr by hand after molding, so that the labor can be saved and the molding time can be shortened. Further, the deburring can be performed safely by automating the deburring, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mold clamping device of a blow molding machine according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view showing a main part of FIG. 1 in a mold-clamped state.

FIG. 4 is a side view showing a main part of FIG. 1 in a mold open state;

FIG. 5 is a cross-sectional view illustrating a mold clamping device of a conventional blow molding machine.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a configuration diagram showing a bottle with a handle after molding.

FIG. 8 is a configuration diagram showing a mold clamping state.

FIG. 9 is a configuration diagram showing a mold clamping state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold 5 cross head 9 toggle mechanism 10, 17 mold mounting plate 11 shaft support 12 guide block 15 electric motor 16 feed screw 50 mold opening / closing interlocking mechanism 61 driving means 62 movable locking shaft 62 a, 70 b first taper portion, second taper Part 70 fixing hook 70c downward opening part 100 mold clamping additional means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 49/00-49/42 B29C 49/48-49/56 B29C 49 / 72,49 / 74 B29C 33 / 20-33/28

Claims (1)

(57) [Claims] 1. A parison hanging from a crosshead (5)
(6) is opened and closed via a mold opening / closing interlocking mechanism (50) and is clamped by the mold (1) held by the first and second mold holders (10, 17) to form a hollow molded product In a mold clamping device of a hollow molding machine, a first taper portion () is provided in any of the mold holders (10, 17) so as to be able to vertically enter and exit via a driving means (61). 62a)
And a first locking portion (62a) provided on any of the mold holders (10, 17).
The second tapered portion (70c) is attached to the downward opening portion (70c)
b) a fixed hook (70) having a hook portion (70a) having the movable locking shaft (62) and the fixed hook
(70) constitutes a mold-clamping addition means (100), and one or more of the mold-clamping addition means (100) are disposed at both side positions (200, 201) orthogonal to the mold opening / closing direction of the mold (1). An axial direction of the movable locking shaft (62) is disposed in parallel with a parting line (300) of a mating portion of the mold (1), and the respective tapered portions (62a , 70b), the upper or lower mold clamping of the mold (1) is configured to be added.