JP2595165B2 - Mold thickness adjustment device for hollow 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 thickness adjusting apparatus for a hollow molding machine, and more particularly to a mold thickness adjusting apparatus for freely adjusting a mold thickness in accordance with a difference in mold thickness due to mold replacement. Regarding new improvements.

[0002]

2. Description of the Related Art Conventionally, a mold thickness adjusting device of this kind of a hollow molding machine is generally known as shown in FIGS.
Has been adopted. That is, what is indicated by reference numeral 1 in FIGS. 5 and 6 is a mold that can be opened and closed and includes a first mold part 2 and a second mold part 3.
In the cavity 1a, a parison 6 hanging from a crosshead 5 of the extruder 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 first mold holder 10. A guide block for holding the shaft support 11 to which the toggle pieces 7 and 8 are flexibly connected includes a pair of center positioning guide bars 13 and 1.
4.

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.
Is provided with a second mold holder 17.

The movable plate 1 connected to the second toggle piece 8
8 is connected to a pair of rods 19, 20.
Reference numerals 9 and 20 are fixedly connected to a first connector 21 connected to the second mold holder 17.

Accordingly, in the above-described configuration, the electric motor 1
By moving the guide block 12 with the feed screw 16 by operating the 5, each toggle piece 7, 8 becomes linear or bent along the position shown by the dotted line and the solid line as shown in FIG. In this case, the mold parts 2 and 3 are closed, and in the case of a bent shape, the mold parts 2 and 3 are opened. When the mold 1 is replaced with another mold having a different thickness, a first spacer having a required thickness is provided between the first clevis 7 a of the first toggle piece 7 and the second mold holder 10. S ₁ is inserted, and a second spacer S ₂ having a required thickness is inserted between the second clevis 8 a of the second toggle piece 8 and the moving plate 18 to adjust the mold clamping force with respect to the mold 1. I was going.

[0007]

The mold thickness adjusting device of the conventional hollow molding machine has been configured as described above.
The following issues existed. In other words, since a very large force is output immediately before each toggle piece is fully extended, the amount of movement before the fully extended piece is small, and a large change in the compression force of the mold due to a slight dimensional difference when the mold is replaced. In order to avoid the problem, the thickness dimension of the mold has to be corrected by inserting a spacer having a different thickness every time the mold is replaced. Since the work of attaching and detaching the spacer must be performed in accordance with the thickness dimension of the mold, it takes a long time, and the necessary holding force is often not obtained due to poor adjustment. Further, it was not possible to easily cope with a difference in thickness of a mold having a variation of a certain dimension or more (large dimensional difference).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, the thickness of a mold can be freely adjusted according to the difference in the thickness of the mold accompanying the replacement of the mold. An object of the present invention is to provide a mold thickness adjusting device for a hollow molding machine.

[0009]

According to the present invention, a mold thickness adjusting device for a blow molding machine is provided between a mold for holding a parison and a toggle mechanism for opening and closing the mold. In a mold thickness adjusting device of a hollow molding machine for performing mold clamping by variably adjusting a mold thickness adjustment amount with respect to the mold by a mold thickness adjusting unit, the mold thickness adjusting unit includes the mold A fixed member having a mounting bolt provided on a side thereof, a movable member movably provided by the mounting bolt and having a long hole, a movable taper surface formed on the movable member, and a movable member provided on the toggle mechanism side. The fixing member has a fixing member having a fixing taper surface to be joined to the taper surface, and a fixing bolt penetrating the elongated hole to fix the fixing member and the movable member to the mold side.

[0010] A mold thickness adjusting device for a hollow molding machine according to the present invention comprises a mold provided for holding a parison and capable of being opened and closed, a toggle mechanism for opening and closing the mold, and the mold. A mold thickness adjusting means provided between the toggle mechanism and the toggle mechanism, wherein the mold thickness adjusting means freely adjusts the mold thickness adjustment between the toggle mechanism and the mold. In a mold thickness adjusting device of a molding machine, the mold thickness adjusting means includes a screw body provided on the mold side and having a threaded portion on an outer periphery, and a nut body provided on the screw portion and having a locking portion. A lock nut provided on the screw portion for fixing the nut body at an arbitrary position, and an engaging member provided on the toggle mechanism side and having an engaging recess for engaging with the locking portion. Configuration.

[0011] A mold thickness adjusting device for a hollow molding machine according to the present invention includes a mold provided for holding a parison and capable of being opened and closed, a toggle mechanism for opening and closing the mold, and the mold. A mold thickness adjusting means provided between the toggle mechanism and the toggle mechanism, wherein the mold thickness adjusting means freely adjusts the mold thickness adjustment between the toggle mechanism and the mold. In a mold thickness adjusting device of a molding machine, the mold thickness adjusting means includes a plurality of pull bolts provided on the mold side, and a connecting member provided on the pull bolt and connected to the toggle mechanism side. And a plurality of push bolts screwed to the connection member and having their tips abutting on the mold side.

[0012]

In the mold thickness adjusting device of the hollow molding machine according to the present invention, the mold thickness adjusting device is provided between a mold for holding the parison and a mold clamping device comprising a toggle mechanism for opening and closing the mold. By variably adjusting the mold thickness of the mold at the time of mold replacement by the mold thickness adjusting means, the mold clamping of the mold can be maintained at a predetermined level and a predetermined hollow molding can be performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a mold thickness adjusting device for a blow molding machine according to the present invention will be described below in detail with reference to the drawings. Note that the same or equivalent parts as those in the conventional example will be described using the same reference numerals. 1 to 4 show a mold thickness adjusting device of a hollow molding machine according to the present invention. FIG. 1 is a configuration diagram showing an entire configuration, and FIG. 2 is an enlarged configuration diagram showing a main part of FIG. 3 is a block diagram showing another embodiment of FIG. 2, and FIG.
FIG. 13 is a configuration diagram showing another embodiment of the present invention.

The structure shown in FIG. 1 is substantially the same as the structure shown in FIGS. 5 and 6 of the conventional example, and the parts omitted in FIG. 1 employ the structures shown in FIGS. Shall be. In FIG. 1, reference numeral 1 denotes a first mold part 2.
And a second mold part 3 which is openable and closable. The parison 6 hanging from the crosshead 5 of the extruder 4 is supplied into the cavity 1 a of the mold 1. .

The second mold part 3 is provided with a first mold holder 10 and a first mold thickness adjusting means 30 by a toggle mechanism 9 comprising a pair of bendable first and second toggle pieces 7 and 8. And the first clevis 7a, and each of the toggle pieces 7,
A guide block 12 for holding a shaft support 11 which is connected to bendable 8 is a pair of center positioning guide bars 13, 14.
It is configured to be guided by.

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 rotated by an electric motor 15.
Is provided with a second mold holder 17.

A pair of rods 19 and 20 are connected to the movable plate 18 connected to the second toggle piece 8 via the second clevis 8a and the second mold thickness adjusting means 31. 20 is fixedly connected to a first connector 21 connected to the second mold holder 17, and the second mold thickness adjusting means 31 is connected to the rods 19, 20 and the second mold holder 1 respectively.
7 is indirectly connected to the first mold part 2. Since the mold thickness adjusting means 30 and 31 are located between the toggle mechanism 9 and the mold 1, both of them are substantially located on the mold 1 side.

Each of the mold thickness adjusting means 30, 31 is configured as shown in FIG. That is, the first mold holder 10 and the moving plate 18 on the mold 1 side are provided with a fixing piece 40A having a mounting bolt 40, and a screw portion 40a of the mounting bolt 40 has a pair of long holes 41a. A movable member 41 having a movable tapered surface 41b is provided movably in the direction of arrow A.

A fixed member 4 connected to each of the clevises 7a, 8a is provided on a movable tapered surface 41b of the movable member 41.
2 fixed taper surfaces 42a are joined, and this fixed member 42
Are screwed into the mold holder 10 and the movable plate 18 via the elongated holes 41a and fixed. Therefore, by loosening the fixing bolt 43 and sliding the movable member 41 relative to the fixing member 42, the mold thickness adjustment D of each of the mold thickness adjusting means 30, 31 can be freely performed. Can be adjusted.

In another embodiment shown in FIG. 3, a screw body 50 having a screw portion 50a is attached to the first mold holding body 10 and the moving plate 18 on the mold 1 side. A nut body 52 having a locking part 51 having a claw-shaped cross section is screwed into the screw part 50 a, and the nut body 52 is configured to be able to be fixed at an arbitrary position by a lock nut 53.

A ring-shaped engaging recess 54a formed in a frame-shaped engaging member 54 provided on each of the clevises 7a, 8a.
Is engaged with the locking portion 51. Therefore, the mold thickness adjustment D can be adjusted by loosening the lock nut 53 and rotating the nut 52 in the axial direction.

In another embodiment shown in FIG. 4, a plurality of pulling bolts 60 are screwed into the first die holder 10 and the moving plate 18 on the die 1 side. The bolt 60 is provided with a plate-shaped connecting member 61 provided on each of the clevises 7a and 8a. The tips 62a of the plurality of push bolts 62 that are screwed through the connecting member 61 are connected to the second bolts 60a. Mold holding body 10 and surfaces 10a, 1 of moving plate 18
8a. Accordingly, by rotating the pull bolt 60 and the push bolt 62, the mold thickness adjustment D can be freely adjusted.

Therefore, in the above configuration, the electric motor 1
5 to move the guide block 12 with the feed screw 16, the toggle pieces 7, 8 become linear or bent along the positions shown by the dotted and solid lines as shown in FIG. In this case, the mold parts 2 and 3 are closed, and in the case of a bent shape, the mold parts 2 and 3 are opened.

When the mold 1 is replaced with another mold having a different thickness, one of the mold thickness adjusting means 30, 31 shown in FIGS. 1 to 4 is adjusted as described above. Thus, the mold thickness adjustment D according to the thickness of the mold 1 can be freely adjusted, so that the mold 1 having any thickness can be adjusted so as to obtain the optimum compressive force. it can.

[0025]

The apparatus for adjusting the thickness of a mold of a blow molding machine according to the present invention is constructed as described above, so that the following effects can be obtained. In other words, for the difference in thickness of the mold that occurs at the time of mold exchange, instead of replacing the spacer each time as in the conventional case, the mold thickness adjustment means can easily and variably adjust the mold thickness adjustment. It can be adjusted, and it is possible to effectively prevent molding errors due to insufficient compression force due to poor adjustment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a main part of a mold thickness adjusting device of a blow molding machine according to the present invention.

FIG. 2 is an enlarged configuration diagram showing a main part of FIG.

FIG. 3 is a configuration diagram showing another embodiment of FIG. 2;

FIG. 4 is a configuration diagram showing another embodiment of FIG. 2;

FIG. 5 is a configuration diagram showing a mold thickness adjusting device of a conventional hollow molding machine.

FIG. 6 is a plan configuration diagram of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 mold D mold thickness adjustment 6 parison 9 toggle mechanism 30, 31 mold thickness adjustment means 40A mounting bolt 41 movable member 41a long hole 41b movable taper surface 42 fixing member 42a fixing taper surface 43 fixing bolt 50 screw body 50a Locking portion 52 Nut body 53 Lock nut 54 Engaging member 54a Engaging concave portion 60 Pull bolt 61 Connecting member 62 Push bolt 62a Tip

Claims (3)

(57) [Claims] A mold thickness adjusting means (1) provided between a mold (1) for holding a parison (6) and a toggle mechanism (9) for opening and closing the mold (1). 30, 31) in a mold thickness adjusting device of a hollow molding machine that variably adjusts a mold thickness adjustment amount (D) with respect to the mold (1) and performs mold clamping, wherein the mold thickness adjusting means ( 30, 31) are a fixing piece (40A) provided on the mold (1) side and having a mounting bolt (40), and a movable piece movably provided by the mounting bolt (40) and having a long hole (41a). Members (4
1) and a movable tapered surface (41) formed on the movable member (41).
b) and a fixed member having a fixed tapered surface (42a) provided on the toggle mechanism (9) side and joined to the movable tapered surface (41b).
(42) and a fixing bolt (43) for penetrating the long hole (41a) and fixing the fixed member (42) and the movable member (41) to the mold (1) side. A mold thickness adjustment device for hollow molding machines. 2. A mold (1) which holds a parison (6) and is openably and closably provided, a toggle mechanism (9) for opening and closing the mold (1), and a mold (1). Mold thickness adjusting means (30, 31) provided between the toggle mechanism (9) and the mold mechanism (9, 31), and the toggle mechanism (9) and the mold ( 1) In a mold thickness adjusting device of a hollow molding machine configured to freely adjust a mold thickness adjustment amount (D) during 1), the mold thickness adjusting means (30, 31) includes: A screw body (50) provided on the mold (1) side and having a screw portion (50a) on the outer periphery; a nut body (52) provided on the screw portion (50a) and having a locking portion (51); Department
A lock nut (53) provided on the (50a) for fixing the nut body (52) at an arbitrary position, and a lock nut (53) provided on the toggle mechanism (9) and engaging with the locking portion (51). A mold thickness adjusting device for a hollow molding machine, comprising: an engaging member (54) having a mating recess (54a). 3. A mold (1) provided for holding a parison (6) and capable of opening and closing, a toggle mechanism (9) for opening and closing the mold (1), and a mold (1). Mold thickness adjusting means (30, 31) provided between the toggle mechanism (9) and the mold mechanism (9, 31), and the toggle mechanism (9) and the mold ( 1) In a mold thickness adjusting device of a hollow molding machine configured to freely adjust a mold thickness adjustment amount (D) during 1), the mold thickness adjusting means (30, 31) includes: A plurality of pull bolts (60) provided on the mold (1) side, a connecting member (61) provided on the pull bolt (60) and connected to the toggle mechanism (9) side, and the connecting member (61 ), And a plurality of push bolts (62) having tips (62a) abutting on the side of the mold (1).