JPH09109237A - Hollow molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow molding machine which makes it possible to shorten the molding cycle by shortening the time required for removing a molding. SOLUTION: The hollow molding machine comprises a mold clamper 1 having split molds 7, 8 and a driving unit 9 for driving a blowing pin 93 into the molds 7, 8, thereby gripping a molding after molding from the pin 93 directly by a removing unit and removing it. The unit 9 has a reciprocating mechanism X for reciprocating the pin 93 in its axial directing, and a rotating mechanism Y for rotating the pin 93 around a horizontal axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding machine used for producing blow molded articles by a blow molding method, and more particularly,
The present invention relates to a reciprocating type blow-in blow molding machine.

[0002]

2. Description of the Related Art A blow molding machine used for producing blow molded articles by a blow molding method comprises a mold clamping device for opening and closing a mold, a driving device for driving a blow pin into the mold, and a parison continuously. It is equipped with an extrusion device for extruding into.

In the reciprocating type blow molding machine,
The mold clamping device includes a main body portion, a tie bar that is movable back and forth in the main body portion and is horizontally supported, and a pair of platens supported by the tie bar, and is divided into opposite sides of the pair of platens. It is configured to include a molding die.

In such a blow molding machine, usually, the parison is continuously fed downward from the above-mentioned extrusion device, the parison is clamped by the split molds, and then the mold clamping device is moved to retract from the parison. After the blow pin is driven into the split mold that has been clamped by the above-mentioned driving device and the blow process and deaeration process have been completed, the split mold is opened and the molded product is taken out directly from the blow pin with the take-out device, and the molding cycle To complete.

[0005]

By the way, in the conventional blow molding machine, when the molded product is taken out from the blow pin by the take-out device, the chuck for holding the molded product of the take-out device is advanced into the split mold. Since the chuck is retracted from the split mold after the molded product is gripped by the chuck, it takes time to take out the molded product and the molding cycle must be extended. In addition, the blow pin driving device is attached independently of the platen and tie bar of the mold clamping device, so that the driving of the split mold can be performed only after the movement of the split mold (retraction from the parison of the mold clamping device) is completed. Since the blow pin cannot be driven by the device, the molding cycle must be lengthened for this reason as well. Further, in the conventional blow molding machine, in the mold moving operation, after moving the mold clamping unit to the blow pin driving position, centering of the blow pin and the mold is performed.
At this time, unless the moving thrust of the mold clamping unit is applied as in the actual molding, there is a problem that the driving position is displaced.
Further, in the conventional blow molding machine, since the centering adjustment work is performed while applying the thrust, the work is dangerous. In addition, if the vibration becomes large during actual molding, the driving position may not be stable and may deviate from the centering adjusted position. Moreover, as described above, since the driving device is attached separately from the split mold and the tie bar, it is necessary to use high-strength mechanical parts in consideration of the load on the tie bar and the platen when driving. In addition, the device had to be large-scaled.

Therefore, a first object of the present invention is to provide a blow molding machine capable of shortening the molding cycle by shortening the time required for taking out a molded product. A second object of the present invention is to provide a hollow molding machine capable of shortening the molding cycle, improving the centering accuracy when driving the blow pin, and reducing the size of the apparatus. It is in.

[0007]

According to a first aspect of the present invention, there is provided a mold clamping device having a split mold and a driving device for driving a blow pin into the split mold. In the blow molding machine, in which the subsequent molded product is grasped and taken out from the blow pin by the take-out device, the driving device is
By providing a reciprocating mechanism for reciprocating the blow pin in its axial direction and a rotating mechanism for rotating the blow pin about a horizontal axis, a hollow molding machine is provided, wherein Has achieved the purpose of.

The invention according to claim 2 of the present invention is
The blow molding machine according to claim 1, wherein, instead of the driving device, a reciprocating mechanism that reciprocates the blow pin in its axial direction, and a reciprocating motion of the blow pin causes the blow pin to rotate about a horizontal axis. A blow molding machine comprising a driving device having a cam mechanism for giving an operation.

Further, the invention according to claim 3 of the present invention provides:
The hollow molding machine according to claim 1 or 2, wherein the driving device is movably provided in a direction in which the blow pin is pulled out from the molded product gripped by the take-out device. Is provided.

[0010] The invention described in claim 4 of the present invention provides:
In the blow molding machine according to any one of claims 1 to 3,
The mold clamping device includes a main body portion, a tie bar that is movable back and forth and horizontally supported by the main body portion, a pair of platens supported by the tie bar, and the split molding die on opposite sides of the pair of platens. And the driving device is supported by the pair of platens or the tie bars below the split mold to drive the blow pin from below the split mold. The second object is achieved by providing a blow molding machine.

In the blow molding machine according to the first aspect of the present invention, the split mold is opened and closed by the mold clamping device, and the parison is sandwiched between the split molds, and the split mold is driven by the driving device. Blow molding is performed by driving the blow pin from below, but after molding,
After the split mold is over-opened, the blow pin is rotated about the horizontal axis to the minimum required to allow the take-out device to hold the molded product, and then the reciprocating mechanism is operated to move the blow pin to its axis. The blow pin can be pulled out from the molded product by moving it in the direction, and the time required for taking out the molded product can be shortened.

In the blow molding machine according to the second aspect of the present invention, the cam mechanism imparts the reciprocating motion of the blow pin by the reciprocating mechanism to the pivoting motion of the blow pin about the horizontal axis. The mechanism related to the operation of the blow pin can be simplified.

In the blow molding machine according to claim 3 of the present invention, since the driving device itself can also move in the direction of pulling out the blow pin from the molded product held by the take-out device, The time required for taking out is further shortened.

In the blow molding machine according to a fourth aspect of the present invention, blow molding is performed by driving a blow pin from below the split mold with the above-mentioned driving device. It is supported by a pair of platens or the above tie bars, and when the body part of the mold clamping device is retracted from the continuously pushed out parison, the driving device also moves with the platen or tie bar, so split molding is performed during the movement of the body part. The blow pin can be driven into the mold, and the molding cycle can be shortened. Further, high accuracy is maintained for centering when the blow pin is driven. Furthermore,
Since the load at the time of driving the blow pin is canceled due to the relationship of the action and reaction force between the platen or tie bar and the driving device, the load applied to the platen and tie bar due to the driving is reduced, and the device is downsized accordingly. Can be achieved.

[0015]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 7 show a first embodiment of a blow molding machine according to the present invention. In these figures, reference numeral A is a blow molding machine, P is a parison, B is a molded product,
S indicates an extruder, and C indicates a crosshead of the extruder S.

As shown in FIGS. 1 and 2, the hollow molding machine A includes a main body portion 2, two tie bars 3 and 3 supported by the main body portion 2 so as to be movable back and forth and horizontally, and a tie bar 3. Three
The front platen 4, the rear platen 5, and the movable platen 6 supported by the front platen 4 and the movable platen 6 are provided. A mold clamping device 1 provided and a driving device 9 for driving a blow pin 93 from below the split molds 7 and 8 are provided.

Support plates 40 and 60 are integrally provided on the front platen 4 and the movable platen 6, and the driving device 9 is supported via a rotary shaft 10 rotatably installed. It is supported by the plates 40, 60.

The driving device 9 includes the rotating shaft 10
Of the base plate 90 fixed to the substantially central portion of the, the electric piston-cylinder mechanism 91 fixed on the base plate 90, and the piston-cylinder mechanism 9
Toggle mechanism 92 that bends and extends by 1 and toggle mechanism 92
And a blow pin 93 that moves up and down by bending and stretching. The piston cylinder mechanism 91 and the toggle mechanism 92 constitute a reciprocating mechanism X that reciprocates the blow pin 93 in its axial direction.

A connecting rod 91b is pin-connected to the tip of the operating rod 91a of the piston / cylinder mechanism 91, and this connecting 91b is pin-connected to the joint of the operating rod 92a of the toggle mechanism 92. . The operating rod 92a is provided so as to bend and stretch with the horizontal movement of the operating rod 91a.

The blow pin 93 serves as the toggle mechanism 9
2 is fixed on a base 94 fixed to the upper end of the operating rod 92, and compressed air supplied through a compressor (not shown) is injected substantially vertically from below the split molds 7, 8. It is provided so that you can

A pinion rack mechanism 100 is attached to one end of the rotary shaft 10, and a rack 101 of the pinion rack mechanism 100 is moved up and down by an electric piston / cylinder mechanism 103 to move the pinion 102. By rotating the rotary shaft 10 about its axis and rotating the rotary shaft 10 about its axis, the blow pin 93 can be tilted about the rotary shaft 10. The rotary shaft 10 and the pinion rack mechanism 100 constitute a rotating mechanism Y around the horizontal axis of the blow pin 93.

The blow pin 93 of the base plate 90.
A guide pipe 95 is inserted in a portion located below the guide pipe 95, and a guide shaft 96 extending downward from the lower surface of the base 94 of the blow pin 93 is inserted in the guide pipe 95. A stopper plate 97 is provided at the lower end portion of the guide shaft 96, and the stopper plate 97 is brought into contact with a stopper pin 98 that hangs down from the lower surface of the base plate 90 so that the rise of the blow pin 93 is restricted. Yes. The rising height of the blow pin 93 is equal to that of the stopper pin 98.
Adjust the protrusion length of the stopper plate 9
By adjusting the distance between the stopper plate 97 and the stopper pin 98, for example, by changing the position of 0,
It can be adjusted.

As shown in FIGS. 1 and 3, the main body portion 2 of the mold clamping device 1 is a frame body 2 fixed on a carriage G.
The tie bars 3, 3 are supported horizontally at the corners of the frame 2a which are diagonally located. The main body 2 is provided with a crank mechanism 20 and an electric motor 22 that transmits a driving force to a crank shaft 21 of the crank mechanism 20. The movable platen 6 and the rear platen 5 are connected to a crank arm 23 of the crank mechanism 20 via connecting rods 24 and 25. The carriage G can be horizontally moved from a position below the crosshead C of the extrusion device S by a ball screw (not shown) driven by a servomotor (not shown) via a speed reducer (not shown). It is provided so that the split molds 7 and 8 can be retracted from the continuously extruded Pariso P. The carriage G can be moved by using a hydraulic or pneumatic piston / cylinder mechanism, or by attaching a carriage G to an extension / contraction mechanism such as a toggle mechanism and setting the extension / contraction mechanism to the servo motor or It may be driven by the piston / cylinder mechanism. Also, a carriage G to save from the parison
May be in a downward or diagonal direction.

The crank mechanism 20 includes the crank shaft 21, a crank arm 23 fixed at a substantially central portion of the crank shaft 21 in the axial direction, and connecting rods 24 and 25 connected to the crank arm 23. It is configured as the subject. Both ends of the crankshaft 21 are rotatably supported by pillow blocks 26 fixed to the main body 2. The drive shaft 22b of the electric motor 22 is connected to one end of the crank shaft 21 via a reduction gear unit 22a. By driving the electric motor 22, the crank mechanism 20 operates. is there.

The crank arm 23 is used for the crankshaft 2
Arm part 23 formed 180 ° rotationally symmetrical with respect to 1.
a, and the connecting rod 24 is provided at the tip of these arm portions 23a via connecting pins 27 and 28 described later.
And 25 are connected. And these arm parts 2
When the 3a and the connecting rods 24 and 25 are aligned, the split molds 7 and 8 come into contact with each other to generate a predetermined mold clamping force.

As shown in FIGS. 4 and 5 (b), the connecting pins 27, 28 for connecting the crank arm 23 and the connecting rods 24, 25 to each other are located in the axially intermediate part of the connecting pins 27, 28 as compared with the both ends. Eccentric portions 27a and 28a having a large outer diameter and offset from the shaft centers of both ends are provided, and gears 27b and 28b are fixed to the tip ends. Both ends of the connecting pins 27 and 28 are rotatably supported by the arm portion 23a of the crank arm 23, and the eccentric portion 27a is inserted into the insertion holes (not shown) of the connecting rods 24 and 25. Has been done.

As shown in FIGS. 4 and 5A, the gear 27 on the side surface of the crank arm 23 is used.
A hand shaft 29 is horizontally and rotatably supported by a support member 29a at a portion located below b and 28b (upper side in FIG. 5A). A worm 29b is fixed to an axially intermediate portion of the hand shaft 29. On the other hand, the crankshaft 21 has the gear 27b,
A gear 21a that meshes with the gear 28b and a worm wheel 21b that is fixed to the gear 21a and meshes with the worm 29b are arranged so as to be rotatable relative to the crankshaft 21. Then, the hand shaft 29 is rotated to connect the worm 29b, the worm wheel 21b, the gear 21a, and the gears 27b and 28b to the connecting pin 27,
By rotating 28, the distance from the axis of the crank shaft 21 to the axis of the eccentric portions 27a, 28a is changed to adjust the extension / contraction length of the crank mechanism 20, and the crank arm 23 and the connecting rods 24, 25 are adjusted. However, regardless of the size and shape of the mold, it can be extended straight. Here, these eccentric parts 27a, 28a, gears 27b, 28
The b, 21a, the hand shaft 29, the worm 29b, and the worm wheel 21b constitute an extension / contraction length adjusting mechanism of the crank mechanism 20.

As shown in FIG. 1, the tie bars 3, 3 are
Male and female screw portions 3a and 3b are provided at the front and rear ends of each of the bushes 40b and 5 of the front platen 4 and the rear platen 5, which will be described later.
0b is screwed on.

The front platen 4, the rear platen 5, and the movable platen 6 are made of square plate-like members when viewed from the front, and the tie bars 3 and 3 are inserted into the corners of the respective platens which are diagonally located. Possible insertion holes 4a, 5a and 6a
Are provided respectively. And the tie bar 3,
The front platen 4, the rear platen 5, and the movable platen 6 can be arranged on the tie bars 3 and 3 so that 3 is positioned symmetrically with respect to the center of the split molds 7 and 8.

Bushings 40b and 50b having female screw portions (not shown) corresponding to the male screw portions 3a and 3b of the tie bar 3 are provided in the insertion holes 4a and 5a of the front platen 4 and the rear platen 5, respectively. Each of these platens can be fixed at a predetermined position on the front and rear ends of the tie bars 3, 3. The front surface of the bush 40b of the front platen 4 has a pulley 30
(See FIG. 6) is fixed. Also, the rear platen 5
Also, support jigs 50c, 60c for fixing one end of connecting rods 24, 25 described later to the pins at the same height as the axis of the crankshaft 21 are fixed to the surface of the movable platen 6 facing the main body 2. Has been done.

As shown in FIGS. 6 and 7, each pulley 30 fixed to the bush 40b of the front platen 4
An endless timing belt 31 is wound around.
A shaft 32 that projects horizontally forward is provided at substantially the center of the front surface of the front platen 4 so as to be rotatable. A drive pulley 33 and a worm wheel 34 are fixed to the shaft 32. Further, a hand shaft 35 is supported on a front surface of the front platen 4 by a supporting member so as to be positioned below the worm wheel 34 so as to be horizontally rotatable. A worm 36 meshing with the worm wheel 34 is fixed to the worm wheel 34. A counter 37 is attached to one end of the hand shaft 35, and the counter 37 can display the fixed position of the front platen 4 by the amount of movement. here,
These pulley 30, timing belt 31, shaft 32, drive pulley 33, worm wheel 34, hand shaft 35, worm 36, and counter 37.
Constitutes a fixed position adjusting mechanism capable of fixing the front platen 4 at an arbitrary position on the front end portion of the tie bar 3.

The blow molding machine A is equipped with a control section (not shown) equipped with a sequencer, and a series of operations of the extrusion device S, the mold clamping device 1 and the driving device 9 are performed by this sequencer. It is controlled according to the control flow. Further, the output from each of the piston / cylinder mechanisms is input to the control unit via an encoder, whereby the position / posture of the blow pin 93 can be controlled.

Next, the operation of the blow molding machine A will be described.

First, a required mold clamping force is generated at a position where the crank arm 23 and the connecting rods 24 and 25 are aligned with each other according to the conditions such as the size and shape of the split molds 7 and 8 and the blow pressure. As described above, by the fixed position adjusting mechanism,
The fixed position of the front platen 5 at the front end portions of the tie bars 3 and 3 is adjusted, or the positions of the movable platen 5 and the rear platen 6 are adjusted by the expansion / contraction length adjusting mechanism. Further, the driving force by the driving device 9 can be estimated by the angle of the toggle mechanism 92 and the thrust force for extending the toggle mechanism. Based on this estimation, how to extend the toggle mechanism 92, or The thrust of the piston cylinder mechanism 91 is set. Further, for the center positioning of the blow pin 93, the fixing of the blow pin 93 to the mounting base 94 is loosened to cut the edge between the blow pin 93 and the mounting base 94, and the blow pin 93 is fixed to the mounting base 9.
After allowing the upper surface of 4 to move freely, carefully perform a driving operation to check the rattling of the blow pin 93 and bring the blow pin 93 into contact with the split molds 7 and 8 to finally form The blow pin 93 is positioned and fixed on the mounting base 94 with the mold and the blow pin center aligned. Then, the adjustment is completed by adjusting the driving height as described above. The center positioning is extremely simple, and since the position is fixed in the actual driving state, the reliability is high, and the operation can be performed easily and quickly at low cost. After that, the crank mechanism 20 is set so that the connecting rods 24 and 25 are bent with respect to the arm portion 23a of the crank arm 23, and as shown in FIG. Put the parison P inside.

Next, when the electric motor 22 is driven, the driving force is decelerated by the deceleration unit 22a and then transmitted to the crankshaft 21. As the crank shaft 21 rotates, the crank arm 23 fixed to the crank shaft 21 also rotates, and the crank arm 23
The connecting rods 24 and 25 connected to the arm portion 23a of the crankshaft via connecting pins 27 and 28 extend outward from the center of the crankshaft 21, respectively. This connecting rod 2
With the extension of 4 and 25, the connecting rods 24 and 25 push the rear platen 5 and the movable platen 6 forward and backward through the support jigs 50c and 60c.

The movable platen 6 approaches the parison P along the tie bar 3, and the front platen 4
Moves closer to the parison P as the tie bar 3 itself moves rearward as the rear platen 5 moves rearward. Finally, the split surfaces of the split molds 7 and 8 abut, and the split molds 7 and 8 hold the parison P.

Simultaneously with the completion of the mold clamping, the cutting of the parison P is started by a cutting device (not shown).

Then, when the parison P is cut, the carriage G to which the main body portion 2 is fixed in order to evacuate the split molds 7 and 8 from the parison P which is continuously and continuously extruded from the cross head of the extrusion device S. Moves horizontally, and accordingly, the split molds 7 and 8 move horizontally in a clamped state.

On the other hand, at the same timing as the cutting of the parison P, the operation of the driving device 9 is started, and as shown in FIG. 8 (a), the connecting rod 91b is moved by the operating rod 91a of the piston / cylinder mechanism 91. Move horizontally in the contraction direction. Then, the operating rod 92a of the toggle mechanism 92 connected to the connecting rod 91b gradually extends, and the guide protrusion (not shown) of the base plate 94 attached to the upper end of the operating rod 92a is guided by the guide groove (not shown). However, the blow pin 93 approaches the split mold in the mold clamped state (see FIG. 8B).

Then, as shown in FIG. 8C, the blow pin 93 is inserted from below into the insertion port of the divided mold which has been clamped, and the stopper plate 97 installed on the linear shaft 96 and the base of the driving device 9 are inserted. Stopping is carried out by a stopper 98 arranged at 90, high-pressure air is discharged and blow molding is carried out. In the blow molding machine A, the driving device 9, the front platen 4 and the movable platen 6 are integrally provided, and the series of operations of the driving device 9 up to this point are performed by the split molds 7 and 8. Since it can be performed during horizontal movement, one molding cycle is greatly shortened.

When the molding blow is performed by the driving device 9, the inner diameter of the mouth portion of the molded product is molded by the blow pin 93, so that the inner diameter is basically not required to be processed later.
Further, as described above, the insertion position of the blow pin 93 can be adjusted by the stopper 98, and the cutting of the mouth of the molded product B can be adjusted.

After the blow process and the deaeration process in the blow molding process are completed, the contracting operation of the crank mechanism 20 is started and the split molds 7 and 8 are opened back and forth.

Then, when the distance between the split surfaces of the split molds 7 and 8 and the molded product B does not interfere, the operation of the pinion rack mechanism 100 attached to the rotary shaft 10 is started, and the rotary shaft is rotated. 10 rotates. Then, as shown in FIG. 9A, the blow pin 93 remains in the mouth of the molded product B and the blow pin 93 waits for a chuck (not shown) of the take-out device (opening / closing of the split mold). Rotation (in the present embodiment, about 30 degrees). After the molded product B is gripped by the chuck of the take-out device, the contracting operation of the toggle mechanism 92 is started, and the blow pin 93 is pulled out from the mouth of the molded product B to separate the driving device 9 and the molded product B from each other. Then, one molding cycle is completed (see FIG. 9B).

After completion of one molding cycle, the main body 2 and the driving device 9 are in the initial state (the main body 2 is moved below the pushing device S, the base plate 90 of the driving device 9 is rotated back, and the toggle mechanism is used. (92 is in a bent state) and waits until the start of the molding cycle.

As described above, according to the blow molding machine A of this embodiment, the chuck of the take-out device is arranged at a position where it does not hinder the opening and closing of the split mold, and after the blow molding process is completed, The blow pin 93 is rotated about the axis of the rotary shaft 10 so that the chuck of the take-out device holds the molded product B, and the toggle mechanism 92 is bent and stretched to blow the blow pin 9.
By pulling out 3 from the molded product B, the molded product B can be taken out from the blow pin 93 and the blow pin 93 and the molded product B can be separated, so that the time required for the extraction process can be greatly shortened. The molding cycle can be shortened.

Further, the driving device 9 is the front platen 4
Since the movable platen 6 is integrally provided and a series of operations of the driving device 9 can be performed during the movement of the split molds 7 and 8, the molding cycle can be significantly shortened.

In addition, the driving device 9 is the front platen 4
Also, since the movable platen 6 is integrally provided, the centering accuracy when the blow pin 23 is driven can be improved.

Further, since the front platen 4 and the movable platen 6 are framed with the base plate 90 of the driving device 9, the load applied to the platen and the tie bars 3 and 3 when the blow pin 93 is driven is applied to the platen or the tie bar 3,
3 and the driving device 9 are canceled in the support plates 40 and 60 due to the force of reaction / reaction, the load at the time of driving is reduced, and the device can be downsized accordingly. .

Further, in the above hollow molding machine A, since the crank mechanism 20 is adopted in the mold clamping device 1 for opening and closing the split molds 7, 8, the hydraulic pressure is constantly applied like a hydraulically actuated piston cylinder mechanism. There is no need to keep it. Accordingly, the running cost can be reduced as compared with the related art, and various problems associated with the use of the hydraulic device do not occur.

Further, since the torque load required for the mold clamping is low, a small motor having a low torque such as an electric motor can be adopted, and the device can be downsized accordingly.

Further, the tie bars 3 and 3 are divided into separate molds 7 and 8.
By arranging diagonally with respect to the center of
Since a uniform mold clamping force can be applied to the contact surface of, the excellent hollow product with less flash can be manufactured. Further, since the front platen 4 and the movable platen 6 on which the split molds 7 and 8 are arranged can be reduced in size and weight, the apparatus itself can be reduced in size and weight as a whole, and energy saving and space saving can be achieved. You can also

Further, with the fixed position adjusting mechanism of the front platen and the expansion / contraction length adjusting mechanism of the crank mechanism, the crank arm and the connecting rod are extended in a straight line,
Since the split mold can be clamped, stable molding can be performed with a uniform mold clamping force regardless of the size and shape of the molding die.

10 and 11 show a second embodiment of the blow molding machine according to the present invention. In these figures, reference numeral A'denotes a blow molding machine. Further, in these drawings, the same parts as those of the blow molding machine A of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the blow molding machine A ', instead of the driving device 9 in the blow molding machine A of the first embodiment, a reciprocating mechanism X'for reciprocating the blow pin in its axial direction and a reciprocating movement of the blow pin. Basically, the hollow molding machine A according to the first embodiment described above is provided except that a driving device 9'having a cam mechanism Z for giving a rotational movement of the blow pin about the horizontal axis is provided. It has the same configuration, and its characteristic part will be described in the following description.

As shown in FIGS. 10 and 11, the driving device 9'in the hollow molding machine A'according to the present embodiment has a base plate 90 'horizontally fixed to the substantially central portion of the shaft 10', A ball screw 91 'horizontally supported on the base plate 90', a toggle mechanism 92 'by the ball screw 91', and a blow pin 93 'vertically moved by bending and stretching of the toggle mechanism 92' are provided.

Ball nut 91 of the ball screw 91 '
a'is integrally provided with a guide portion 91c ',
This guide portion 91b 'has a toggle mechanism 92' which will be described later.
A guide groove 91d 'for vertically moving a connecting pin 92b' connecting the operating rod 92a 'is provided.

A timing pulley 91 is attached to one end of the ball shaft 91b 'of the ball screw 91'.
e'is attached to this timing pulley 91.
e ′ and the timing pulley 91f ′ attached to the output shaft of the electric motor M, the endless timing belt 91
By winding g ′, the electric motor M is driven and the ball shaft 91 of the ball screw 91 ′ is driven.
The b'can be rotated about its axis.

The toggle mechanism 92 'includes a connecting pin 92.
Two actuating rods 92a ', 92a' connected by b '
It is mainly composed of a pair of toggle rods. The connecting pin 92b 'is inserted in the guide groove 91c' so that the joint portion of the connecting pin 92b 'moves up and down when the operating rod bends and extends. The ball screw 91 'and the toggle mechanism 92' constitute the reciprocating mechanism X '.

An elevating base 94a 'is pin-connected to the upper end of the toggle rod, and a lower end of the toggle rod is pin-connected to the base plate 90'. The operating rod is provided so as to bend and stretch with the horizontal movement of the ball nut 91a 'in the ball screw 91'.

A groove extending in the axial direction of the ball screw 91 is formed on the upper surface of the elevating base 94a 'connected to the upper end of the toggle rod, and a connecting rod 94b' is pivotally installed in this groove. ing. The base 94 for attaching the blow pin is attached to the free end of the connecting rod 94b '.
c'is pin-coupled. A pair of guide protrusions 94d 'are provided on both side surfaces of the base 94c' so as to project therefrom. The guide protrusion 94d 'is provided on the upper surface of the base plate 90' so as to stand upright.
The base 94c 'moves up and down and around the horizontal axis by moving along the 7'-shaped guide groove 97a' (in the present embodiment, the guide protrusions 94d 'located on both sides of the blow pin 93' are removed). It can be rotated to a fulcrum). Here, the lifting base 94a ', the connecting rod 94b', the base 94c ', and the guide protrusion 94d'.
The guide groove 97a 'constitutes a cam mechanism Z that gives the reciprocating motion of the blow pin 93' the rotating motion of the blow pin 93 'about the horizontal axis.

The blow pin 93 'has the base 94.
Fixed on c ', compressor (not shown)
It is provided so that compressed air supplied through can be injected substantially vertically from below the split molds 7, 8.

That is, in the driving device 9 ', the ball shaft 91b' of the ball screw 91 'is rotated to move the ball nut 91a' uniaxially.
The blow pin 93 'is provided so that it can be moved vertically and rotated about a horizontal axis.

In the portion of the base plate 90 'located below the base 94a', the guide pipe 9
5'is inserted, and in this guide pipe 95 ',
A guide shaft 96 ′ extending downward from the lower surface of the base 94a ′ is inserted. The blow pin 93 'can be vertically moved in a stable manner.

Next, the operation of the blow molding machine A'will be described. In the following description, only the characteristic parts of the blow molding machine will be described, and the operation description of the parts common to the blow molding machine A of the first embodiment will be omitted.

In the blow molding machine A ', in the initial state of the molding cycle, as shown in FIG. 12B, the ball screw 91' is so arranged that the blow pin 93 'is in a vertical state.
Set the ball nut position of. Then, at the same timing as the cutting of the parison P, the operation of the driving device 9 ′ is started and the motor M is driven to drive the ball screw 91 ′.
To rotate. Then, as shown in FIG. 12A, the ball nut 91a ′ of the ball screw 91 ′ is
The toggle rod of the toggle mechanism 92 'horizontally moves so as to extend. Then, the blow pin 93 'is inserted from below into the insertion opening of the split mold in the clamped state, and high-pressure air is discharged to perform blow molding. In the blow molding machine A ′, the driving device 9 ′ and the front platen 4
Since the movable platen 6 and the movable platen 6 are integrally provided, and the series of operations of the driving device 9 ′ up to this point can be performed while the split molds 7 and 8 are moving horizontally, Similarly, one molding cycle is significantly reduced.

After the blow process and the deaeration process in the blow molding process are completed, the contracting operation of the crank mechanism 20 is started and the split molds 7 and 8 are opened back and forth.

Then, when the distance between the split surfaces of the split molds 7 and 8 and the molded product B does not interfere, the electric motor M is driven to rotate the ball screw 91 ', and the blow pin 93' is molded. With the product B still inserted in the mouth of the product B, the product B again descends to the condition shown in FIG. Then, the electric motor M is further driven, and the ball nut 91
By further horizontally moving a ′, the base 94
The d ′ shifts from the lowering operation to the rotating operation with the guide protrusion 24d ′ as the fulcrum. Along with this, the blow pin 93 ′ also rotates, and finally the blow pin 93 ′ rotates until the axis of the blow pin 93 ′ becomes horizontal. Then, the chuck of the take-out device is arranged at this position, and the molded product B in the horizontal state is held (see FIG. 13).

After the molded product B is gripped by the chuck of the take-out device (not shown), the main body 2 is moved to the initial position of the molding cycle to pull out the blow pin 93 'from the mouth of the molded product B. , The driving device 9'and the molded product B are separated, and one molding cycle is completed.

After the completion of one molding cycle, the main body 2 and the driving device 9'are in the initial state (the main body 2 is moved below the pushing device S, the driving device 9'is in the vertical position of the blow pin 93 '(see FIG. 12 (b) state)), and waits until the molding cycle starts.

Thus, the blow molding machine A'of this embodiment is
According to this, the blow pin 93 'is rotated until its axis becomes horizontal, and the molded product B is held horizontally by the chuck of the take-out device (not shown), and then the main body 2 is returned to the initial state of the molding cycle. Since the blow pin 93 'can be pulled out from the molded product B at some times to separate the blow pin 93' and the molded product B, the time required to take out the molded product B can be significantly shortened compared to the conventional case. The molding cycle can be shortened accordingly.

By the cam mechanism Z, the reciprocating motion of the blow pin 93 'by the reciprocating mechanism X'can be given the rotating motion of the blow pin 93' about the horizontal axis. This mechanism can be simplified. In addition, in the driving device 9 ′, the blow pin 9 is uniaxially controlled by the ball screw 91 ′.
Since the vertical movement operation of 3'and the rotation operation about the horizontal axis are controlled, only the rotation amount of the electric motor M for rotating the ball screw 91 'is used to adjust the position (height and rotation) of the blow pin. Angle) can be controlled. Also,
By changing the rotation speed, the speed of the blow pin 93 'can also be changed. Therefore, a series of operations can be performed smoothly, the operation time can be shortened, and the driving device itself can be simplified.

The blow molding machine according to the present invention is not limited to the blow molding machine according to the above embodiment, and its size, shape, etc. may be appropriately changed without departing from the object of the present invention. it can.

For example, in the blow molding machine A of the above embodiment, the pinion rack mechanism 100 attached to the rotary shaft 10 is used to rotate the rotary shaft 10.
Although the uniaxial movement of the rack 101 is performed by the electric piston / cylinder mechanism 103, as shown in FIG. 14, the uniaxial movement of the rack 101 is performed by connecting the ball screw 104 to the output shaft of the motor 105. Screw 10
Alternatively, the motor 105 may be operated via the control unit 4. Further, as another rotating mechanism of the rotating shaft 10, for example, FIG.
As shown in FIG. 5, the reduction gear 10 is directly attached to the rotary shaft 10.
A mechanism for connecting the motor 107 via 6 may be adopted.

Further, in the blow molding machine A of the above embodiment, the rotary shaft 10 is rotated so that the rotation angle of the blow pin 93 becomes 30 degrees, but the rotation angle of the blow pin 93 becomes 90 degrees. Setting the blow pin 93 can be performed by the bending operation of the toggle mechanism 92 and the returning operation of the driving device 9, whereby the time required for taking out the molded product can be shortened. In the blow molding machine A ′, the blow pin 93 ′ is rotated until its axis becomes horizontal. However, the blow pin 93 ′ horizontal shaft is provided by attaching a means for pulling out the molded product to the take-out device side. The rotation angle around may be at least 30 degrees or more.

Further, in the blow molding machine A'of the above embodiment, the bending mechanism 92 'is bent and extended by the ball screw 91'. However, as another mechanism for bending the toggle mechanism 92 ', a belt mechanism is used. Other mechanisms such as mechanisms, pinion rack mechanisms, etc. can be used. Further, the same effect as that of the hollow molding machine A ′ according to the above-described embodiment can be obtained by moving the elevating base 94c ′ up and down without using the toggle mechanism 92 ′.

Further, in the blow molding machine of each of the above-described embodiments, the driving device is supported by the support plates 40 and 60 integrally provided on the front platen 4 and the movable platen 6, but the driving device tie bar 3, It is also possible to directly support it on 3.

In the blow molding machine A of the above-mentioned embodiment, both the fixed position adjusting mechanism and the expansion / contraction length adjusting mechanism are adopted, but it is also possible to adopt only one of them. Further, if the molding die is not changed, the fixed position adjustment mechanism and the expansion / contraction length adjustment mechanism do not necessarily have to be adopted.

In the blow molding machine according to the present invention,
As the drive source of the crank mechanism 20, it is particularly preferable to use an electric motor as in the hollow molding machine A of the above-mentioned embodiment, but it is also possible to operate with a drive source driven by fuel such as kerosene, gasoline, or heavy oil. .

In the hollow molding machine of the present invention, it is particularly preferable that the opening / closing mechanism of the split molding die is the crank mechanism as in the hollow molding machine A of the above-mentioned embodiment, but the opening / closing mechanism of the split molding die is The opening / closing mechanism may be used.

Further, like the driving device 9'in the hollow molding machine of the embodiment shown in FIG. 16, the piston / cylinder mechanism 91 'and the toggle mechanism 92' are mounted on the base 90 'fixed to the rotary shaft 10'. By arranging a plurality of expandable and contractible blow pins 93 ', and while performing the rotation for taking out the molded product for one blow pin,
The molding cycle can be further shortened by setting the other blow pins in the standby position for driving.

[0082]

According to the blow molding machine of the present invention, the following effects can be obtained.

According to the blow molding machine of the first aspect, the molding cycle can be shortened by shortening the time required for taking out the molded product.

According to the blow molding machine of the second aspect, in addition to the above effects, the cam mechanism causes the blow pin to reciprocate by the reciprocating mechanism, and the blow pin rotates about a horizontal axis. Can be given, so that the mechanism relating to the operation of the blow pin can be simplified.

According to the blow molding machine of the third aspect, the molding cycle of the molded product can be shortened.

According to the blow molding machine of claim 4, in addition to the effect of the blow molding machine of any one of claims 1 to 3, the centering accuracy at the time of driving the blow pin can be improved. In addition, the size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a first embodiment of a blow molding machine according to the present invention.

FIG. 2 is a perspective view showing a driving device in the blow molding machine of the same embodiment.

FIG. 3 is a plan view showing a mold clamping device in the blow molding machine of the same embodiment.

FIG. 4 is a plan view showing an expansion / contraction length adjusting mechanism of the crank mechanism of the mold clamping device in the blow molding machine of the same embodiment.

5A and 5B are views showing the expansion / contraction length adjusting mechanism, wherein FIG. 5A is a side view, and FIG. 5B is a sectional view taken along the line CC of FIG.

FIG. 6 is a front view showing a fixed position adjusting mechanism of the front platen of the mold clamping device in the blow molding machine of the same embodiment.

7A and 7B are views showing the fixed position adjusting mechanism, in which FIG. 7A is a side view and FIG. 7B is a sectional view taken along the line AA of FIG.

8A and 8B are views showing the operation of the driving device in the blow molding machine of the same embodiment, FIG. 8A is a schematic view of a main part showing an operation start state of the driving device, and FIG. 8B is a split mold for blow pins. FIG. 4 is a schematic view of a main part showing a state of insertion into a blow pin, and FIG.

9A and 9B are views showing the operation of the driving device in the blow molding machine of the same embodiment, FIG. 9A is a schematic view of a main part showing a state in which a rotary shaft of the driving device is rotated, and FIG. 9B is a blow pin. It is a principal part schematic diagram which shows the state which the molded product separated from.

FIG. 10 is a schematic side view showing a second embodiment of the blow molding machine according to the present invention.

FIG. 11 is a perspective view showing a driving device in the blow molding machine of the same embodiment.

12A and 12B are views showing the operation of the driving device in the blow molding machine of the same embodiment, FIG. 12A is a schematic view of a main part showing a state in which a blow pin is inserted into a split mold, and FIG. 12B is a driving device. FIG. 4 is a schematic view of a main part showing the operation start state of FIG. 3, and FIG.

FIG. 13 is a schematic view of a main portion showing a state where a blow pin has been completely rotated in the driving device of the blow molding machine of the embodiment.

FIG. 14 is a perspective view of essential parts showing another embodiment of the rotating mechanism of the rotating shaft in the hollow molding machine of the first embodiment.

FIG. 15 is a perspective view of an essential part showing another embodiment of the rotating mechanism of the rotating shaft in the hollow molding machine of the first embodiment.

FIG. 16 is a view showing a main part of another embodiment of the driving device in the blow molding machine according to the present invention.

[Explanation of symbols]

 1 mold clamping device 2 main body part 3, 4 tie bar 5, 6 platen 7, 8 split mold (split mold) 9, 9'striking device 93, 93 'blow pin A, A'hollow molding machine X reciprocating mechanism Y Rotation mechanism

Claims (4)

[Claims] 1. A hollow comprising a mold clamping device having a split molding die and a driving device for driving a blow pin into the split molding die, wherein a molded product after molding is taken out from the blow pin by grasping with a take-out device. In the molding machine, the driving device includes a reciprocating mechanism that reciprocates the blow pin in its axial direction, and a rotating mechanism that rotates the blow pin about a horizontal axis. Machine. 2. The blow molding machine according to claim 1,
In place of the driving device, a driving mechanism including a reciprocating mechanism that reciprocates the blow pin in its axial direction and a cam mechanism that gives the reciprocating motion of the blow pin a rotational motion of the blow pin about a horizontal axis. A blow molding machine comprising a device. 3. The driving device in a direction of pulling out the blow pin from the molded product gripped by the take-out device,
The blow molding machine according to claim 1 or 2, wherein the blow molding machine is movably provided. 4. The mold clamping device comprises a main body portion, a tie bar that is horizontally movable in the main body portion and is supported horizontally, a pair of platens supported by the tie bar, and opposite sides of the pair of platens. Is provided with the split mold, and the driving device is supported by the pair of platens or the tie bars below the split mold to drive the blow pin from below the split mold. The blow molding machine according to claim 1, wherein the blow molding machine is a blow molding machine.