JP2000334820A - Die driving method and apparatus for hollow molding machine - Google Patents

Abstract

(57) [Summary] A synchronizer 30 has only a function of synchronously moving first and second molds 17 and 18. As a result, the first and second mold clamping cylinder devices 50 and 51 are large and heavy. SOLUTION: First and second platens 15 and 16 placed on a base 10 are reciprocated while being synchronized by a synchronizer 30, and the first and second platens 15 and 16 attached to the first and second platens 15 and 16 are reciprocated. The second molds 17 and 18 are closed and opened to form a parison 61 between the molds 17 and 18, and the operation of the synchronizer 30 is performed by a rotating body rotatably supported at a predetermined position on the base 10. A mold driving method for a hollow molding machine obtained by rotating 33, 37, 38, comprising rotating bodies 33, 3
By rotating 7, 38 in the forward and reverse directions,
The first and second platens 15, 16 are reciprocated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for driving a mold of a hollow molding machine.

[0002]

2. Description of the Related Art There is known a conventional hollow molding machine in which a synchronous device is attached to a mold driving device for opening and closing a mold. This type of blow molding machine has, for example, a configuration as shown in FIG. That is, bearings 13, 14 are provided on guide members 11, 12 on base 10.
The first and second platens 15 and 16 are movably mounted via the first and second platens 15 and 16.
7 and 18 are attached so as to face each other.

On the base 10, each platen 1
The first and second fixed frames 2 are located behind
The first and second mold clamping cylinder devices 50 and 51 are disposed between the fixed frames 20 and 21 and the platens 15 and 16, respectively. Each mold clamping cylinder device 5
Reference numerals 0 and 51 denote cylinders 52 and 53 fixed to the fixed frames 20 and 21, pistons 54 and 55 slidably fitted to the cylinders 52 and 53, and piston rods 56 and 53, respectively.
57, and the distal ends of the piston rods 56, 57 are pin-connected to the platens 15, 16, respectively.

A synchronizer 30 is provided between the first and second platens 15 and 16. This synchronization device 3
Reference numeral 0 denotes a rack and pinion type synchronizing device, in which a first rack 31 fixed to the first platen 15 and a second platen 16
And a pinion 33 whose upper and lower portions mesh with the teeth of both racks 31 and 32. The pinion 33 is a floating gear rotatably supported at a predetermined position of the base 10 by a support shaft 34 and can freely rotate at the predetermined position. Reference numeral 60 denotes a crosshead connected to an extruder (not shown), reference numeral 61 denotes a parison hanging from the crosshead 60, and reference numeral 62 denotes a blowing nozzle for blowing air.

According to the synchronizing device 30, the first and second platens 15, 1 are controlled by the mold clamping cylinder devices 50, 51.
6 and the first and second dies 17, 18
Since the pinion 33 rotates at a predetermined position without moving along with the movement of the second racks 31 and 32, both the racks 31 and 32 and the first and second platens 15, 16 and thus the first and second dies. The molds 17 and 18 are synchronously opened and closed.

[0006] Such a synchronizing device 30 includes a parison 61.
And the first and second molds 17, 18 with respect to the blowing nozzle 62.
At the same time, and the matching surfaces of the two dies 17 and 18 when the dies are closed coincide with the centers of the parison 61 and the blowing nozzle 62. As a result, it is possible to perform molding of a product having stable molding conditions one after another with uniform molding conditions.

However, in such a conventional mold driving method for a hollow molding machine, the pinion 33 is an idle gear, and the synchronizer 30 functions to synchronously move the first and second dies 17 and 18. Have only As a result,
There is a technical problem that the first and second mold clamping cylinder devices 50 and 51 are indispensable and large and heavy.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional technical problems, and has the following configuration. According to the first aspect of the present invention,
The first and second platens 15 and 16 placed on the first and second plates are reciprocated while being synchronized by the synchronizer 30.
First and second molds 1 attached to second platens 15 and 16
The mold 7 is closed and the mold is opened, the parison 61 is formed between the molds 17 and 18, and the operation of the synchronizing device 30 is controlled by the rotating body (33) rotatably supported at a predetermined position of the base 10. , 37, 38) by rotating the hollow body (33, 37, 3).
A mold driving method for a hollow molding machine, characterized in that the first and second platens 15 and 16 are moved by rotationally driving 8). According to a second aspect of the present invention, the first and second bases are movably mounted on the base.
Platens 15, 16 and first and second platens 15, 16
A first and a second molds 17 and 18 for molding the parison 61, and rotating bodies (33, 37 and 38) rotatably supported at predetermined positions on the base 10; A synchronizer 30 for rotating the rotating bodies (33, 37, 38) when moving the synchronizers 15 and 16 synchronously;
A rotary driving device (3) for driving the rotating bodies (33, 37, 38) of the synchronizing device 30 to rotate in forward and reverse directions. According to a third aspect of the present invention, the rotator (3
3) The pinion 33 meshes with both the first rack 31 attached to the first platen 15 and the second rack 32 attached to the second platen 16.
Of a hollow molding machine. According to a fourth aspect of the present invention, the rotating body (33) of the synchronizer 30 is at least one of the pair of pulleys 37, 38, and the first rotating member (33) is attached to the belt 39 wound around the pulleys 37, 38. , Second
3. The mold driving device for a blow molding machine according to claim 2, wherein the platens 15, 16 are connected so as to move synchronously.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. However, the same functional portions as those of the conventional example shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, reference numeral 1 denotes a synchronizing device and a driving device, and a driving device is attached to a conventional synchronizing device 30 shown in FIG. The synchronizer 30 includes a first rack 31 fixed to the first platen 15 as described above.
A second rack 32 fixed to the second platen 16, and a pinion 3 whose upper and lower portions mesh with teeth of both racks 31, 32.
And 3. And the pinion 33 which is a rotating body
, A rotation drive device 3 capable of forward and reverse rotation via a speed reducer 2 is connected. Specifically, the pinion 33 is
A spindle 34 rotatably supported at a predetermined position on the base 10
, And the support shaft 34 is driven by the rotary drive device 3. Each platen 1 shown in the conventional example
5 and 16, that is, the first and second fixed frames 20 and 21 and the first and second mold clamping cylinder devices 50 and 51.
Is omitted in the present invention because it is not essential.

With the omission of the first and second mold clamping cylinder devices 50 and 51, a mold clamping device 5 is provided between the platens 15 and 16. The mold clamping device 5 includes a clamp mechanism 70 fixedly mounted on the first platen 15 as shown in FIG.
And a clamped mechanism 71 fixed to the platen 16. The clamp mechanism 70 includes a support member 72 fixed to the first platen 15, a clamping cylinder 73 fixed to the support member 72, and a pair of clamp members 74 connected to the tip of the support member 72 in a freely openable and closable manner. It has a swingable rod 75 for connecting each clamp member 74 and the piston 73a of the clamp cylinder 73. Cylinder for clamping 7
The third piston 73a is pulled, for example, by the elastic force of a spring 76, returns to the right in the drawing in a normal state, and opens a pair of clamps 74 via a rod 75.

On the other hand, the clamped mechanism 71 includes a mold clamping cylinder 77 fixed to the second platen 16 and a pull rod fixed to the piston 77a of the mold clamping cylinder 77 and having a large spherical clamp portion 78a at the tip. 78. The mold clamping cylinder 77 has a pressure chamber 77b partitioned by a piston 77a. Although the mold clamping device 5 and the synchronizing device / drive device 1 are shown as one set each in the drawing, they are usually arranged on both sides of the first and second platens 15 and 16.

According to such a hollow molding machine, the driving of the first and second platens 15 and 16 and the first and second dies 17 and 18, that is, the opening and closing operation of the dies is performed by the driving of the rotary driving device 3. It is done. Now, it is assumed that the mold is in an open state as shown in FIG. 1, the rotation driving device 3 is driven in one direction, and the pinion 33 is rotated clockwise through the reduction gear 2 and the support shaft 34. By the rotation of the pinion 33, the first rack 31, the first platen 15, and the first mold 17 move leftward in the drawing, and the second rack 32, the second platen 16, and the second mold 18 move in the drawing. To move to the right, a mold closing operation is obtained. At this time, the pair of clamp members 74 are opened, and the clamp portion 78a is received between the opened clamp members 74.

A clamp 78 is attached to the opened clamp member 74.
When the working fluid is supplied to the clamping cylinder 73 in the state of receiving the “a” and the piston 73 a is pushed out against the elastic force of the spring 76, the pair of clamp members 74 is closed via the rod 75. As a result, the large clamp 7
8a is firmly held by the clamp 74. Next, when the working fluid is supplied to the pressure chamber 77b of the mold clamping cylinder 77, the piston 77a and the pull rod 78 are pulled leftward in the drawing, and the closed clamp member 74 and the support member 72 are closed.
Is similarly pulled to the left in the drawing, so that a pair of molds 17,
18 can be clamped.

When the dies 17 and 18 are clamped with the parison 61 interposed therebetween, air is blown into the parison 61 from the blowing nozzle 62 to inflate the parison 61 along the cavities of the dies 17 and 18 to form a predetermined shape. An article is formed. Since the cylinder 77 of the mold clamping device 5 only needs to be able to resist the opening force of the molds 17 and 18 caused by blowing air into the parison 61, the conventional mold clamping cylinder device 50 and
It is smaller and lighter than 51. Parison 61
Is cut by a cutting device (not shown) above the dies 17 and 18 and separated from the crosshead 60.

When the molded product has cooled in the cavities of the molds 17, 18, the mold is opened. At that time, first, the mold clamping operation by the mold clamping device 5 is released, and the clamping operation between the clamp mechanism 70 and the clamped mechanism 71 is released. That is, the working fluid in the pressure chamber 77b of the mold clamping cylinder 77 is drained, and the working fluid in the clamping cylinder 73 is drained. Accordingly, in a state where the pressure contact between the clamp member 74 and the clamp portion 78a is released, the piston 73a of the clamping cylinder 73 returns to the right by receiving the elastic force of the spring 76. The clamp 74 is opened.

Next, when the rotation driving device 3 is driven to rotate in the other direction, the pinion 33 rotates counterclockwise through the speed reducer 2. Due to the rotation of the pinion 33, the first rack 31, the first platen 15, and the first mold 17 move rightward in the figure, and the second rack 32, the second platen 16, and the second mold 18 move in the figure. To move to the left, a mold opening operation is obtained. When the molds 17 and 18 are opened, the molded product is taken out. Subsequently, the parison 61 is hung between the molds 17 and 18 in the opened state, and molded articles can be obtained one after another by the same operation.

FIG. 4 shows another embodiment, and the same reference numerals are given to the same functional portions as those in the first embodiment. In this embodiment, the synchronizing device and driving device 1 has a synchronizing belt type synchronizing device 30. That is,
Pulleys 37, 38 as rotating bodies are fixed to a pair of support shafts 35, 36 rotatably supported at predetermined positions on the base 10, and a belt 39 is wound around the pair of pulleys 37, 38. The first connecting member 40 fixed to the first platen 15 is connected to the lower part of the belt 39 having an annular shape, and the second connecting member 41 fixed to the second platen 16 is provided.
Is connected to the upper part of the belt 39. The one pulley 37 is connected via the speed reducer 2 to the rotary drive device 3 capable of rotating forward and reverse. The illustration of the mold clamping device 5 is omitted.

According to this embodiment, as shown in FIG. 4, the rotary driving device 3 is driven in one direction in the mold open state, and the pulley 37 is rotated clockwise through the speed reducer 2 and the support shaft 35. This causes the belt 39 to move in the same direction.
Due to the movement of the belt 39, the first platen 15 and the first mold 17 move to the left in the drawing via the connecting members 40 and 41, and the second platen 16 and the second mold 18 move in the drawing. Since it moves to the right, a mold closing operation is obtained.

Further, the rotary driving device 3 is driven in the other direction,
By rotating the pulley 37 counterclockwise through the speed reducer 2 and the support shaft 35, the belt 39 and the connecting members 40 and 4 are rotated.
1, the first platen 15 and the first mold 17 move rightward in the figure, and the second platen 16 and the second mold 18 move leftward in the figure. can get. In this manner, the same operation as in the first embodiment can be obtained.

[0021]

As will be understood from the above description,
According to the method and the apparatus for driving the mold of the hollow molding machine according to the present invention, the following effects can be obtained. That is, the first and second dies are reciprocated while being synchronized by the synchronization device, and the rotating body of the synchronization device is rotationally driven in the forward and reverse directions by a rotation driving device or the like, so that the first and second dies are rotated. 1. The second mold reciprocates. Thus, in addition to the function of synchronously moving the first and second dies, the first and second dies are added to the synchronizer.
A function of driving the platen and the first and second molds is provided. Thus, the function of the conventional mold clamping cylinder device can be obtained by the synchronization device, so that the mold clamping cylinder device can be downsized or omitted.

[Brief description of the drawings]

FIG. 1 is a front view showing a mold driving device of a hollow molding machine according to one embodiment of the present invention.

FIG. 2 is a sectional view showing the same mold clamping device.

FIG. 3 is an explanatory view showing the operation of the mold driving device.

FIG. 4 is a front view showing a mold driving device of a hollow molding machine according to another embodiment.

FIG. 5 is a front view showing a mold driving device of a conventional hollow molding machine.

[Explanation of symbols]

1: Synchronous device and drive device, 3: Rotary drive device, 10: Base, 15: First platen, 16: Second platen, 1
7: first mold, 18: second mold, 30: synchronous device, 3
1: first rack, 32: second rack, 33: pinion (rotating body), 37, 38: pulley (rotating body), 39: belt, 61: parison.

Claims (4)

[Claims] 1. A first and a second mounted on a base (10).
The platens (15, 16) are reciprocated while being synchronized by the synchronizing device (30), and the first and second platens (1) are moved.
The first and second molds (17, 18) attached to the molds (5, 16) are closed and opened to form a parison (61) between the molds (17, 18) and the synchronizing device. The operation of (30) is a mold driving method for a hollow molding machine obtained by rotating a rotating body (33, 37, 38) rotatably supported at a predetermined position on a base (10), wherein the rotating body is (33,3
7. A method for driving a mold of a hollow molding machine, characterized in that the first and second platens (15, 16) are moved by rotating and driving (7, 38). 2. A base (10) and first and second platens (15, 16) movably mounted on the base (10).
And attached to the first and second platens (15, 16),
First and second molds (17, 1) for molding the parison (61)
8) and a rotator (33, 37, 38) rotatably supported at a predetermined position on the base (10). When the first and second platens (15, 16) are moved in synchronization with each other, the rotation is performed. Synchronizing device (3) in which body (33, 37, 38) rotates
0) and the rotating bodies (33, 37, 3) of the synchronizer (30).
8) A rotation drive device (3) for rotating the drive in the forward and reverse directions
And a mold driving device for a hollow molding machine. 3. The rotating body (33) of the synchronizer (30).
Is the first rack (3) attached to the first platen (15).
3. The mold driving device for a blow molding machine according to claim 2, wherein said pinion is a pinion engaged with both said first rack and said second rack attached to said second platen. 4. The rotating body (33) of the synchronizer (30).
Are at least one of a pair of pulleys (37, 38), and the first and second platens (15, 16) are synchronously moved by a belt (39) wound around the pulleys (37, 38). 3. The mold driving device for a hollow molding machine according to claim 2, wherein the mold driving device is connected in such a manner.