JP2509682Y2 - Mold hanging structure of molding machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold hanging structure of a molding machine, which is suitable for use in a blow molding machine for blow molding a detergent container, a cosmetic bottle and the like from a parison.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 61-103660 discloses a pair of molds that can be horizontally lifted by using a lifting tool equipped with a center-of-gravity movement adjusting device.

In Japanese Utility Model Laid-Open No. 2-34214, locking tools provided on a pair of molds are locked to each other to prevent the pair of molds from opening when the molds are lifted. Is disclosed.

[0004]

[Problems to be Solved by the Invention]
In the conventional technique described in Japanese Patent Laid-Open No. 103660, in order to allow a pair of molds to be horizontally hoisted, it is necessary to equip a lifting tool with a center-of-gravity movement adjusting device, and the configuration is complicated.

Further, in the conventional technique disclosed in Japanese Utility Model Laid-Open No. 34342/1993, there is no structure for horizontally suspending a pair of molds, and there is a possibility that the molds may be tilted during lifting. Further, in this conventional technique, in order to prevent the mold from opening,
It is necessary to attach a special locking tool for opening prevention to each mold, which complicates the construction.

The present invention enables a pair of molds to be horizontally lifted with a simple structure, and is suitable for lifting the molds.
The purpose is to prevent the opening of the die .

[0007]

[0008]

According to a first aspect of the present invention, a pair of metal molds are provided with suspension lock portions, and the pair of metal molds are locked by the suspension lock portions. the mold lift, the mold hanger structure of a molding machine, the central position between two hanger locking portion is set to be positioned on their pair of mold overall center of gravity line Ri Na, hanger is Both hangings
Engage with each side of the locking part to prevent opening of the pair of molds
This is provided with a mold opening restricting portion .

According to a second aspect of the present invention, in addition to the first aspect of the present invention, a balance weight is provided on at least one of the pair of molds.

[0010]

[0011]

According to the present invention, the following effects are obtained.

Since the central position between the suspension locking portions provided on each of the pair of molds is set so as to be located on the total center of gravity line of the pair of molding die, these suspension locking portions are set. The pair of dies can be hoisted horizontally only by locking them with hoists and hoisting.

Each suspension locking part is located on the individual center of gravity line of each mold.
Lift the molds when they are not in position to make work for each mold.
Gravity to use the moment around the corresponding suspension lock
And open the pair of molds to each other at the bottom of them.
To try At this time, in the present invention, the metal mold of the hanging tool
The opening restricting part engages with each side part of both suspension locking parts and
A special opening stopper is used to prevent the opening of the pair of molds.
Without opening the mold.

A balance way for at least one mold
The center of gravity of the pair of molds is
Can be almost matched to the mating surface of both molds, resulting in
The suspension locking parts provided on each mold should be close to each other near their mating surfaces.
Can be installed close to. Therefore, lock on both of the hanging locks
The hanging device can be made compact.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rotary blow molding machine, which has an extruder 10 for vertically extruding a tubular molten parison 2 made of a thermoplastic resin. A turntable 7 rotatably supported on a base 5 attached to the extruder 10 via a support shaft 6 (see FIG. 8).
6 sets of a pair of opening / closing molds 8 and 8'for carrying out blow molding by sandwiching the molten parison 2 are respectively placed via each base plate 9, and each of the 6 sets of a pair of opening / closing molds 8 is placed. , 8'intermittently rotates the section from station A to station F shown in FIG. 1 to make one turn, so that the molten parison 2 is molded into a molded article 2 '(detergent container, cosmetic bottle, etc., for example. (See FIG. 11), continuous blow molding can be performed.

As shown in FIG. 1 to FIG. 4, the extruder 10 is provided with a lower base 11 and a swing drive mechanism 20 on the lower base 11 so as to be horizontally rotatable with respect to the lower base 11. The upper base 12 and the molten parison 2 in the pair of opening / closing molds 8 and 8'when the upper base 12 and the upper base 12 are reciprocally moved in the vertical direction by the vertical drive mechanism 30 to descend.
And an extruder main body 13 for supplying

As shown in FIGS. 1 to 4, the extruder main body 13 has a hopper 14 for charging a pelletized thermoplastic resin (raw material) on the upper rear side thereof, and the hopper 14 has a structure as shown in FIG. A cylinder 18 having a screw 16 which is rotated by a motor 15 or the like and having an outer side heated by a heater (not shown) is provided in a lower portion. The thermoplastic resin heated and melted in the cylinder 18 is turned into three tube-shaped molten parisons 2, 2 and 2 by a tubular pushing die head 19 provided at the tip of the cylinder 18, and a pair of vertically downward opening / closing dies 8 are provided. , 8 ', respectively, are simultaneously extruded and supplied into each of the three cavities of the same shape. The number of the molten parison 2 extruded from the extruder body 13 is not limited to three, and may be one, two, or four or more.

The swivel drive mechanism 20, as shown in FIGS. 1 to 4, is fixed to each of the guides 21 fixed to the four corners of the upper surface of the lower base 11 and to the four corners of the lower surface of the upper base 12. Each guide 22 slidably provided with respect to each of the guides 21, and a slewing ring bearing (inner bearing) 23 having inner teeth 23a on the inner peripheral surface thereof are fixed to the upper surface of the lower base 11 to form a shaft portion. A drive gear 27 fixed to 26 a is composed of a motor 26 that meshes with the inner teeth 23 a of the inner bearing 23.

As shown in FIGS. 2 to 4, the vertical drive mechanism 30 includes a pair of hinges 31 and 31 provided between the rear portion of the upper base 12 and the rear portion of the extruder main body 13, and the upper base 12. Pair of shock absorbers 32, 32 interposed between the front part of the rotor and the front part of the extruder main body 13, and the upper base 1.
A pair of brackets 33, 33 standing upright on the front side of the upper surface of 2.
A pair of links 34, one end of which is axially supported, and a pair of brackets 3 which hang down to the front side of the lower surface of the extruder body 13.
A link 36 whose one end is axially supported by 5, 35 and the upper base 1
A bracket 37 standing upright on the upper surface of the rod 2 is pivotally supported in the vertical direction so that the other end of the pair of links 34, 34 and the other end of the link 36 are clamped by the U-shaped portion at the tip of the rod 38a. And a hydraulic cylinder 38 pivotally supported by a pin.

Further, as shown in FIGS. 5 and 7, the parison cutting device 40 is disposed below the die head 19 and is supplied into the pair of open / close molds 8 and 8 '.
The upper ends 2a, 2a, 2a of the molten parison 2, 2, 2 are cut into a certain length so as to slightly project from the upper surfaces of the pair of opening / closing dies 8, 8 '. The parison cutting device 40 is fixed to the extruder body 13 and extends horizontally below the front portion of the cylinder 18, and a support shaft 43 is provided on the base portion of the base plate 41.
An air cylinder (actuator) 42 that is swingably supported in the left-right direction via the like, and a center of a shaft portion 44a is fitted to a one-way clutch 46 fixed to the lower surface of the tip of the base plate 41 with a bolt 45. The tip of the rod 42a of the air cylinder 42 is pivotally supported by a pin and is fixed to the lower end of a shaft portion 44a of the rotary plate 44, which rotates in one direction (clockwise) by the reciprocating movement of the rod 42a. Mounting plate 47, a cutter 48 having a triangular tip mounted on the upper surface of the front part of the mounting plate 47 through a plurality of bolts 49, and the air cylinder 42 and the rotary plate 44 on the base plate 41. And a cutter positioning mechanism 50 that determines the cutting start position (rotation start point position) of the cutter 48. Then, the cutter 48 does not reciprocate but rotates in one direction, so that the upper ends 2a, 2 of the molten parison 2, 2, 2 are
Since a and 2a are cut, the molten parisons 2, 2 and 2 can be cut into a constant state, for example, a constant length. In addition, each melting parison 2
The upper end 2a of the above is left as an upper burr 2a '(burr at the mouth) on the upper part of the molded product 2'after the blow molding.

The cutter positioning mechanism 50 is shown in FIG.
As shown in FIG. 6, a small air cylinder 51 is fixed to the base plate 41 so as to be arranged substantially parallel to the air cylinder 42, and is rocked on the recess 41a of the base plate 41 via a support shaft 53 on the base plate 41. A pair of links 52, 52 movably supported, and an intermediate link 54 with both ends pivotally supported by the center of the pair of links 52, 52 and the tip 51a of the rod of the air cylinder 51, respectively.
And is rotatably supported between the tip ends of the pair of links 52, 52 via a support shaft 56, and abutted against and separated from an arcuate notch 44b formed on the outer periphery of the rotary plate 44. Roller 55 that determines the cutting start position (rotation start point position) of the cutter 48.

A turntable 7 rotatably supported on the base 5 via a support shaft 6 has a lower peripheral edge formed on the base 5.
Is mounted on a large number of bearings 60 that are installed upright on the outer circumference of the turntable 7, and an annular driven gear 6 is provided on the outer periphery of the turntable 7.
1 is fixed. The driven gear 61 is meshed with a pair of idle gears 62, 62 which are rotatably supported via respective support shafts 63 provided upright on the base 5. In addition, the pair of idle gears 62, 62 is formed by the base 5 described above.
It meshes with the drive gear 66 attached to the speed reducer 65 of the upper AC servo motor 64. Since a pair of idle gears 62, 62 are interposed between the drive gear 66 and the driven gear 61 on the outer periphery of the turntable 7, backlash between the gears can be eliminated, and the turntable 7 can be removed. Positioning during intermittent rotation and stop can be performed with high accuracy.

Further, as shown in FIGS. 1 and 8, a door-shaped gate frame 67 is erected from the position of station B of the turntable 7 on the base 5 to the position of station E so as to straddle the turntable 7. It is set up. Further, a molded product container 68 for housing the molded product 2'taken out at the position of the station F of the turntable 7 on the base 5.
And a chute 69 is erected. And the gate frame 6
At the position of station B of the turntable 7 of No. 7, a burr shape correcting mechanism 70 for correcting the upper end 2a of the molten parison 2 before solidification protruding above the upper surfaces of the pair of opening / closing molds 8 and 8'to a flat standing state. It is provided. Further, between the upper frame 68a and the middle frame 68b protruding above the turntable 7 of the molded product container 68, the molded product 2'when the pair of open / close molds 8, 8'after hollow molding is opened. There is provided a molded product take-out device 80 for picking up the upper burr 2a 'of the molded product 2'after picking up and lifting the upper burr 2a' of the molded product 2'and picking up the body 2b 'while gripping it.

The burr shape correcting mechanism 70 is shown in FIGS.
As shown in 0, a bracket 71 fixed to the upper middle of a pair of opening / closing molds 8 and 8'of the station B of the turntable 7 of the gate frame 67 is fixed with a nut 72 at its front end and hangs down four pieces. , A double-sided mounting plate 74 mounted on the lower end of each of the guide bolts 73, and both side portions 74 of the mounting plate 74.
a, 74a of the pair of guide shafts 75, 75 penetrating and sliding to project above the upper surfaces of the pair of opening / closing dies 8, 8 '. Top 2
A pair of clampers 76, 76 for clamping a, 2a, 2a to correct the flat standing state, and the mounting plate 74.
And a pair of air cylinders 77, 77 that are attached to the outer center of both side portions 74a, 74a of the rod 77a and fix the tips of the rods 77a to the centers of the clampers 76 to bring the clampers 76 into contact with and separate from each other. There is. Further, a cooling means may be provided to the pair of clampers 76, 76 to accelerate the solidification of the upper end 2a of the molten parison 2.

The molded product take-out device 80 is shown in FIG.
As shown in FIG.
a pair of open / close molds 8 and 8 ′ disposed in a and subjected to blow molding
The upper burr gripping and taking out mechanism 81 for gripping and raising the upper burr 2a 'of each molded product 2'when the mold is opened, and the molded product storage container 6 described above.
The upper burr 2a of each molded product 2'provided by the upper burr gripping and taking out mechanism 81 which is disposed on the middle frame 68b of
180 'while holding the body 2b'
The suction gripping and conveying mechanism 90 rotates to store the molded product 2 ′ in the molded product storage device 68.

The upper burr gripping and taking out mechanism 81 is shown in FIGS.
As shown in FIG. 14, an air cylinder 82 erected on the tip side of the upper frame 68a of the molded product container 68 and a tip of a rod 82a of the air cylinder 82 are fixed,
A substantially U-shaped mounting plate 83 that moves in the vertical direction by the expansion and contraction of the rod 82a, and a pair of guide shafts 84 that are bridged over both side portions 83a and 83b of the mounting plate 83,
A pair of chucks 85, 86 for penetrating and sliding through 84 to hold the upper burr 2a 'of the molded product 2'from inside the pair of opening and closing molds 8, 8'when opened, and one side of the mounting plate 83. 83a
Attached to the center of the inner surface of the air cylinder 87 in which the tip of the rod 87a is fixed to the center of one of the chucks 86, and both sides of the outer surface of the one side portion 83a of the attachment plate 83, and the tip of each rod 88a is attached to the other side. The chuck 85
It is constituted by three chuck pieces 89 of the other chuck 85 and a pair of air cylinders 88, 88 for abutting and separating the one chuck 86, respectively, which are fixed to both sides of the above. Then, by moving the rods 87a and 88a of the air cylinders 87 and 88, the three chuck pieces 89 of the one chuck 85 and the other chuck 86 form the molded product 2 '.
The upper burr 2a 'of the above is grasped at the upper end, and the rod 82a of the air cylinder 82 is retracted to take out the molded product 2'from the pair of open / close molds 8 at the time of opening, and the upper frame of the molded product storage container 68. It is designed to be raised to a predetermined position below 68a. The chucks 85 and 86 may be provided with cooling means.

As shown in FIGS. 11 and 15 to 17, the suction gripping and conveying mechanism 90 has a pair of arms 91 that rotate every 180 ° by a motor 92 that stands on the middle frame 68b of the molded product container 68. , 91, and a pair of guide shafts 93 provided on both sides of the front end of each arm 91,
A slide frame 94 slidably provided in the front-rear direction along 93, and a tip of a rod 95a is fixed to the slide frame 94, and air for reciprocating the slide frame 94 in the front-rear direction by moving the rod 95a back and forth. Cylinder 9
5, three suction pads 96 mounted on the front surface of the upper part of the slide frame 94 at equal distances and vacuum-sucking the upper burr 2a 'of the molded product 2', and the same distance on the lower front surface side of the slide frame 94. Separately installed, each air cylinder 9
8 is composed of three pairs of gripping pieces 97, 97 for gripping and releasing the body 2b 'of the molded product 2'. Incidentally, reference numeral 99 in FIG. 11 is a proximity switch,
By the proximity switches 99, the pair of arms 91,
Each suction pad 9 provided at each front end of 91
6 and the pair of gripping pieces 97, 97 so that the rotation positions of the pair of arms 91, 91 are located on the open pair of open / close molds 8, 8'and the shooter 69 of the molded product container 68, respectively. Each is decided.

The pair of opening / closing molds 8 and 8'of six sets arranged on the turntable 7 at intervals of 60 ° via six base plates 9 are the molds shown in FIGS. It can be freely opened and closed by the tightening device 100. The mold clamping device 100 includes a pair of guide shafts 101 and 101 fixed in parallel to each other in the horizontal direction via three support blocks 102 standing upright at the center of the base plate 9 at equal distances. A pair of movable plates 103, 103 ′, which are slidably provided on the pair of guide shafts 101, 101 and have the respective molds 8, 8 ′ fixed to the opposing surfaces, and the movable plates 103, 103.
A pair of clamp rods 104, 104 ', one end of which is fixed to the back side of the ′, for abutting and separating the respective molds 8, 8 ′.
And the bracket 1 erected on one end (outside) of the base plate 9
06 is swingably supported by a pivot shaft 107 located below the height of each of the guide shafts 101, 101, and the other end of the one clamp rod 104 ′ is supported at the upper end by a pin pivotal support via an intermediate link 108. In addition, the lower end of the swing lever 105 protrudes downward from the upper surface of the base plate 9 through the opening 9a, and the pair of blocks 10 below the base plate 9.
9, 109 is slidably supported, and one end is pivotally supported by the other end of the clamp rod 104 ′ of the swing lever 105 via the intermediate link 111 between the other end of the intermediate link 108 and the pivot shaft 107. And the other end of the slide rod 110 and the other end of the other clamp rod 104 are connected to each other via the opening 9b of the base plate 9 and the slide rod 110 that is pin-pivotally supported at the lower end equidistant from A connecting plate 112 that slides along a bracket 113 that stands up on the other end (inside) of the base plate 9, and a pair of hydraulic cylinders (actuators) 114 that hang down at positions corresponding to the stations A and F of the gate frame 67, 11
5, the connecting plate 112 is reciprocally movable, and the connecting plate 112 is moved forward by the one hydraulic cylinder 114 to close the pair of opening and closing molds 8 and 8 ′, and the other hydraulic cylinder 115 is used. It is composed of a toggle mechanism 120 for returning the connecting plate 112 to open the pair of open / close molds 8 and 8'and hold these states.

The toggle mechanism 120 is rotatably supported in a vertical direction by a bracket 113 standing on the other end (inside) of the base plate 9 via a support shaft 122, and one end of the toggle mechanism 120 is pressed by the other hydraulic cylinder 115. And the other end of the first link 121 is flipped upward and the middle part is the first link 1
21 is pin-pivotally supported at the other end, and the other end is pin-pivotally supported at the connecting plate 112 and is slid along the opening 113a of the bracket 113.
When the other end of 21 bounces upward, the connecting plate 112 is returned, and the roller 124 rotatably supported at one end is pressed by the one hydraulic cylinder 114 to move the connecting plate 112 forward. It is configured with the second link 123.

A procedure for blow molding the molten parison 2 by intermittently rotating the pair of open / close molds 8 and 8'from the station A to the station F by the rotary blow molding machine 1 of the above embodiment will be described.

First, the station F is opened as shown in FIG. 18, and the pair of open / close molds 8 and 8'for taking out the respective molded products 2'by the molded product removing device 80 are rotated to the station A. Therefore, when the AC servomotor 64 is stopped and the pair of opening / closing molds 8 and 8'is stopped at the station A, the pair of opening / closing molds 8 and 8'is already extruded to a predetermined length. It is closed by the mold clamping device 100 so as to sandwich the molten parison 2, 2. That is,
The roller 12 of the second link 123 of the mold clamping device 100.
4 is pressed downward by the hydraulic cylinder 114, and the connecting plate 112 moves (forward) on the base plate 9 toward the outside (outward in the radial direction of the turntable 7). Due to the forward movement of the connecting plate 112, one clamp rod 104 pushes one mold 8 in the closing direction and the other clamp rod 1
04 'moves through the slide rod 110, the intermediate link 111, the swing lever 105, and the intermediate link 108 in the opposite direction to the one clamp rod 104, and pushes the other mold 8'in the closing direction. As a result, the pair of open / close molds 8 and 8 ′ are instantly closed so as to sandwich the three molten parisons 2, 2 and 2. At approximately the same time as the mold clamping of the pair of opening / closing molds 8 and 8 ', the cutter 48 rotates at a high speed in one direction (clockwise direction) of the arrow in FIG. 5 due to the forward / backward movement of the rod 42a of the air cylinder 42 of the parison cutting device 40.
The three molten parisons 2, 2 and 2 are instantly cut. Since the cutter 48 rotates in one direction by the one-way clutch 46 to cut the molten parisons 2, 2, 2 respectively, the molten parisons 2, 2, 2 are always cut in a constant state, for example, always in the same fixed length. be able to. As a result, it is possible to easily monitor the cutting length of each molten parison 2, 2 and feedback control by processing the data. Further, the cutting start position of the cutter 48 is always positioned by the cutter positioning mechanism 50 at the position shown by the solid line in FIG. 5, so that the effect of always cutting each of the molten parisons 2, 2 to the same constant length is promoted. .

At substantially the same time as the cutting of each of the molten parisons 2, 2, 2, the die head 19 side of the extruder main body 13 of the extruder 10 is, as shown in FIG. It rotates around 31 and goes up. As a result, when the pair of opening / closing dies 8, 8'rotates to the next station B, the pair of opening / closing dies 8, 8 '
8'and each molten parison 2, 2 being extruded from the die head 19 do not interfere with each other. When the pair of open / close molds 8 and 8 ′ and the molten parisons 2, 2 and 2 being extruded are rotated to a position where they do not interfere with each other, the die head 19 side of the extruder body 13 of the extruder 10 is moved to the position shown in FIG. , A pair of hinges 31, 31 as a center, the rod 38a of the hydraulic cylinder 38 of the vertical drive mechanism 30 retracts to rotate downward and descend, and the next pair of opening / closing dies 8, 8'stops at the station A. When melting each parison 2, 2, 2
Die head 1 so that the
The three molten parisons 2, 2 and 2 are continuously extruded from No. 9.

Next, the AC servo motor 64 is driven to close the pair of open / close molds 8 and 8 ',
By repeating intermittent rotation and stop at intervals of 60 ° from the station B to the station E, the blow needle (not shown) built in the pair of opening / closing molds 8 and 8'provides inside the pair of opening / closing molds 8 and 8 '. Compressed air is blown into each of the sandwiched molten parisons 2 and blow-molded into a predetermined shape in a hollow shape. After the molding, a pair of open / close molds 8, 8 '
Inside, the molded product 2'is cooled.

In the pair of open / close molds 8 and 8 ', the compressed air suction device is not the blow pin but the blow needle, and therefore the molded product 2'cannot be taken out by the blow pin. Therefore, in the station B, the upper ends 2a, 2a, 2a of the respective molten parisons 2, 2, 2 before solidification, which slightly project from the upper surfaces of the pair of opening / closing dies 8, 8 ',
Are clamped by a pair of clampers 76, 76 of the burr shape correcting mechanism 70 to correct the upper ends 2a, 2a, 2a of the molten parisons 2, 2, 2 into a flat upright state, and the molded product take-out device 80 described later A pair of open / close dies 8,8
It is easy to take out the molded product 2'from within.

In each section from the station A to the station F, the turntable 7 having a large diameter (for example, 2700 mm) and a high weight (about 10 tons) includes an AC servo motor 64, a drive gear 66, and a pair of idle gears. 62, 62,
A turntable driving device including a driven gear 61 and the like intermittently rotates each at high speed (for example, 2.5 seconds) (for example,
After rotating in 60 seconds for 1.6 seconds and then stopping for 0.9 seconds), the pair of open / close molds 8 and 8'is sequentially rotated intermittently. Further, a pair of idle gears 62, 6 are provided between an annular driven gear 61 fixed to the outer circumference of the turntable 7 and a drive gear 66 that transmits the rotation of the AC servo motor 64.
Since 2 is interposed, backlash between gears can be eliminated. As a result, the turntable 7 can be rotated and positioned more accurately when stopped.

When the pair of open / close molds 8 and 8'approaches the station F, the pair of chucks 85 and 86 of the upper burr gripping and taking-out mechanism 81 of the molded product taking-out device 80 have already descended. The upper burr 2a 'of the molded product 2'projected from the upper surfaces of the open / close molds 8 and 8'and corrected to a flat upright state by the burr shape correction mechanism 70 is held by each chuck piece 89 of the chuck 85 and the chuck 86. Almost at the same time as this gripping, the mold clamping device 100 is operated by the hydraulic cylinder 115 to open the pair of open / close molds 8, 8 '. And
Rod 8 of air cylinder 82 of upper burr gripping and taking out mechanism 81
The pair of chucks 85 and 86 are lifted up to the suction gripping conveyance mechanism 90 by the retraction of 2a. When the molded product 2'has been lifted by the upper burr gripping and taking out mechanism 81, as shown in FIG. 11, each suction pad 96 provided on one arm 91 of the suction and gripping transfer mechanism 90 is moved to the molded product. 2 '
The lower part of the pair of chucks 85, 86 of the upper burr 2a 'is securely vacuum-adsorbed, and the body 2b'
The molded product 2'is securely held by the pair of gripping pieces 97, 97 without shaking. Next, the arm 91 is rotated by 180 ° by the motor 92 to release the sucked and held state, so that each of the finished molded products 2 ′ is stored in the molded product storage container 68.

The mold opening of the pair of opening and closing molds 8 and 8'by the mold clamping device 100 is performed in the direction opposite to the mold clamping in the connecting plate 11.
It is performed by moving (returning) 2. The pivot 107 of the swing lever 105 of the mold clamping device 100 is located below the height of the pair of guide shafts 101, 101, and the pin pivot of the intermediate link 108 at the other end of the clamp rod 104 ′ from this pivot 107. Distance to fulcrum and Axis 1
Since the distance from 07 to the pin pivot point of the intermediate link 111 of the slide rod 110 is made equal, the pivot shaft 107 is provided in the middle of the positions of the pair of guide shafts 101 and the upper surface of the base plate 9. The mold clamping force of the mold clamping device 100 is
The pair of guide shafts 101, 101 and the base plate 9 can be evenly divided, and an unreasonable load is not applied to the base plate 9 and the like. The open / closed state of the pair of open / close molds 8 and 8 ′ is as follows.
The toggle mechanism 120 having a simple structure composed of the first link 121, the second link 123 and the like can securely hold the toggle mechanism 120.

After the blow molding by the rotary blow molding machine 1, when the screw 16 of the extruder 10 is pulled out for cleaning, as shown by the chain double-dashed line in FIG. The extruder main body 13 of the machine 10 can be rotated by a predetermined angle by the rotation drive mechanism 20. As a result, the extruder body 13 does not interfere with the mold clamping device 100 and the like, and the screw 16 and the like can be easily cleaned. Further, since the extruder main body 13 is of the swivel type, the installation space of the rotary blow molding machine 1 can be saved.

According to the above-described embodiment, the extruder 10 of the rotary blow molding machine 1 is provided by the vertical drive mechanism 30 so as to be vertically movable around the pair of hinges 31, 31. However, as in the extruder 10 ′ according to another embodiment shown in FIG. 19, the positions of the pair of hinges 31 ′ and 31 ′ are substantially the same as the height of the die head 19 via the inverted V-shaped frame 3. It may be (on the same horizontal plane). As a result, the vibration of the die head 19 and the misalignment of the parison 2 can be reliably solved. Since the other structure is the same as that of the above-described embodiment, the same reference numerals are given and detailed description thereof will be omitted.

Next, the blow molding method by the blow molding machine 1 will be described in detail.

The blow molding machine 1 extrudes the parison 2 and
The extruder 10 that hangs down, the pre-sealing device 200 that pre-seals one end of the parison 2, and the pre-blowing device 201 that is built in the die head 19 of the extruder 10 so as to pre-blow compressed air into the pre-sealed parison 2.
And a pair of molds 8 and 8'which hold the parison 2 and close both ends of the parison 2 and compressed air in the parison 2 closed in the molds 8 and 8 ', Mold 8,
Mold 8 to inject until it matches the 8'cavity
And a blower device 202 built in.

In the blow molding machine 1, the parison 2 extruded from the extruder 10 is hung, and one end of the parison 2 is pinched and pre-sealed by the pre-sealing device 200. Two
By pre-blowing compressed air into the inside of the parison 2 and then sandwiching the parison 2 with a pair of molds 8 and 8 ', both ends of the parison 2 are closed, and the compressed air is put into the closed parison 2.
The molded product 2'is blow-molded by injecting the parison 2 until it coincides with the cavities of the molds 8, 8 ', and the molded product 2'is cooled in the molds 8, 8'. .
In FIG. 25, 230 is a cooling water channel provided in the molds 8 and 8 '.

However, in the blow molding machine 1, as shown in FIG. 20, the pre-sealing device 2 is provided at the lower end portions of the pair of molds 8 and 8 '.
00 is provided. In the pre-sealing device 200, the pair of pre-sealing plates 203 and 203 ′ are arranged so as to project in front of the mating surfaces of the molds 8 and 8 ′, and the pre-sealing plates 203 and 203 ′ are arranged.
Compression springs 204, 20 for elastically supporting 203 'from the back
4'is provided. As a result, the pre-seal device 200 is
In the intermediate process of closing the molds 8 and 8 ', one end of the parison 2 is pinched by the pre-seal plates 203 and 203' to pre-seal. On the other hand, in the blow molding machine 1, the compressed air discharge port 205 of the pre-blowing device 201 is opened in the center of the die head 19 of the extruder 10, and the compressed air is constantly discharged from this compressed air discharge port 205. Therefore, when one end of the parison 2 is pre-sealed by the pre-sealing device 200 as described above, the compressed air supplied by the pre-blowing device 201 inflates the entire parison 2 to form a constant gap between the two parison skins. Then, in the subsequent process, the blow needle 210 of the blow device 202 is placed in the cavity of the mold 8, 8 ′.
Prevents the parison 2 from being blow-molded by piercing the two parison skins.

That is, in the blow molding machine 1, the pre-sealing of the parison 2 is performed at the maximum distance from the lower parts of the molds 8 and 8 ', that is, the extruder 10. Therefore, during pre-sealing, the parison 2 is not subjected to a strong bending action immediately below the die 19A and the core 19B in the die head 19 of the extruder 10 and does not cause ring mark flaws. Therefore, the lower burr to be cut off at the lower end of the parison 2 can be reduced, and the yield can be improved.

In the blow molding machine 1, the parison 2 is extruded in a length corresponding to the entire length of the molded product at the stage of presealing the parison 2, and the parison 2 is inflated uniformly by the preblowing. . Therefore, pre-blowing can be performed in the entire process of extruding the parison 2, the pre-blowing before pre-sealing is simply penetrated through the parison 2, and the pre-blowing after pre-sealing is performed in the parison 2.
Will be inflated evenly throughout. That is, it is not necessary to monitor the timing of starting the pre-blowing, and the control of the pre-blowing can be simplified.

Further, in the blow molding machine 1, as shown in FIG. 21, the blow needle 210 of the blow device 202 and the blow needle drive unit 211 are built in the die 8 attached to the movable plate 103 which is the die attaching plate. ing. That is, the guide block 212 is integrated with the back surface portion corresponding to each cavity of the mold 8, and the blow needle drive portion 211 is integrated with the guide block 212. And
The blow needle drive unit 211 is configured to have an air cylinder 213 and a piston rod 214, and connects the base end portion of the blow needle 210 to the piston rod 214. The blow needle drive unit 211 is used for the air cylinder 2.
213A needle protruding port 213A and needle return port 21
By selectively switching the supply of compressed air to and from 3B, the blow needle 210 is moved to the cavity entry position (see FIG. 21B) and the cavity exit position (see FIG. 21B).
(See (A) and (C)). When the blow needle 210 is set to the cavity entry position, the air introduction port 215 provided in the guide block 212.
The air passage 2 formed in the center of the blow needle 210
Connect to 16. When the blow needle 210 is set to the cavity exit position, the air discharge port 217 provided in the guide block 212 communicates with the cavity internal space through the needle guide hole 218 provided in the mold 8.

Therefore, in the blow molding machine 1, (1)
The pair of molds 8 and 8'is opened, and the parison 2 is moved to the molds 8 and 8
The blow needle drive part 2 when it is inserted between the mating surfaces of
11 sets the blow needle 210 to the cavity exit position, and (2) when the pair of molds 8 and 8 ′ are closed, the blow needle drive unit 211 sets the blow needle 210 to the cavity entry position, and as described above. Pre-blow one parison of parison 2 with a blow needle 21
The compressed air supplied from the air introduction port 215 is injected into the parison 2 by piercing at the tip of 0. The injection of the compressed air by the blow needle 210 is continued until the parison 2 is molded in conformity with the cavities of the molds 8 and 8'and further cooled. And (3) a pair of molds 8, 8 '
Immediately before opening, the blow needle drive unit 211 sets the blow needle 210 to the cavity exit position,
The high pressure air in the ‘′ is released from the needle piercing hole of the parison 2 via the needle guide hole 218 of the die 8 to the air outlet 217.
Is released from the atmosphere to prevent high-pressure air in the molded product 2'from deforming the molded product 2'when the mold is opened.

Further, as shown in FIG. 21, the blow molding machine 1 incorporates the ejector pin 221 and the ejector pin drive section 222 of the ejector device 220 in the molds 8 and 8 '. That is, the air cylinders 223 of the ejector pin drive unit 222 are built in at the upper and lower ends of the molds 8 and 8 ′,
The piston rod of the air cylinder 223 constitutes the ejector pin 221. Ejector pin drive unit 22
2 is a standby for retracting the ejector pin 221 into the upper and lower closing surfaces of the molds 8 and 8'by selectively switching the supply of compressed air to the pin projecting port 223A and the pin returning port 223B of the air cylinder 223. Position (Fig. 2
1 (A) and (B)) and the working positions (see FIG. 21C) where they are projected from the upper and lower closing surfaces of the molds 8 and 8 '. 224 is a pin guide hole provided in the molds 8 and 8 '.

As a result, in the blow molding machine 1,
When taking out the molded product 2'where the pair of molds 8 and 8'is open,
As shown in FIG. 21C, the ejector pin drive unit 225
Project the ejector pins 221 from the upper and lower closing surfaces of the molds 8 and 8 ', and clamp the upper burr of the molded product 2'by a pair of ejector pins 221 provided on the upper ends of the molds 8 and 8', and The pair of ejector pins 221 provided on the lower end sides of the molds 8 and 8'hold the lower burr of the molded product 2 ', so that the molded product 2'can be taken out of the molds 8 and 8'.

That is, in the blow molding machine 1, the blow needle 210 and the blow needle drive part 211 of the blow device 202, and the ejector pin 221 and the ejector pin drive part 222 of the ejector device 220 are the molds 8, 8.
Since the molds 8 and 8'are incorporated in the molds 8, when the molds 8 and 8'are attached to and detached from the movable plates 103 and 103 'which are mold mounting plates, the blow needles 210 and the ejector pins 221 are attached to the molds 8 and 8'. Guide hole 218 and pin guide hole 2
There is no need to perform a setting operation such as inserting the blow needle 210, the ejector pin 221 and the driving portions 211 and 222 thereof into the mold 24, and the workability of exchanging the molds 8 and 8'can be improved.

The blow needle 210 and the ejector pin 221 are connected to the needle guide hole 21 in the molds 8 and 8 '.
8, the pin guide hole 224 is inserted in advance, and is integrated with the drive parts 211, 222 in the molds 8, 8'in advance. Therefore, those blow needles 21
0, the ejector pin 221 and the needle guide hole 218,
There is no possibility of causing an assembling position error with the pin guide hole 224 or mechanical rattling or assembling position error in the attachment / detachment part between the blow needle 210, the ejector pin 221 and the driving parts 211, 222. The smooth operability of the blow needle 210 and the ejector pin 221 can be ensured.

Next, in the blow molding machine 1, the cooling water supply pipe line 231 provided on the movable plates 103 and 103 'which are mold attachment plates and the cooling water supply pipe line 232 provided on the molds 8 and 8'.
, A pair of the cooling water discharge conduit 233 provided on the movable plates 103 and 103 ′ and the cooling water discharge conduit 234 provided on the molds 8 and 8 ′, and the blow cylinder air supply conduit provided on the movable plate 103. 235 and a pair of blow cylinder air supply pipeline 236 provided in the mold 8, a pair of blow cylinder air discharge pipeline 237 provided in the movable plate 103 and a blow cylinder air discharge pipeline 238 provided in the mold 8. , A pair of blowout air supply pipeline 239 provided on the movable plate 103 and a blowout air supply pipeline 240 provided on the mold 8, and the movable plates 103, 103.
′ Of the ejector cylinder air supply pipe 241 and the molds 8 and 8 ′ of the ejector cylinder air supply pipe 242, and the movable plates 103 and 103 ′ of the ejector cylinder air discharge pipe 243. And a structure in which each pair of ducts of the air discharge pipeline 244 for ejector cylinders provided in the molds 8 and 8 ′ are connected to each other under the mounting state of the molds 8 and 8 ′ to the movable plates 103 and 103 ′. Will be described.

First, regarding the cooling water supply pipes 231, 232 and the cooling water discharge pipes 233, 234, FIGS.
As shown in FIG. 6, the conduit 23 on the movable plate 103, 103 ′ side
The connecting ends of 1, 233 are male connecting pipes 231A, 233A planted in the movable plates 103, 103 ', and the connecting ends of the pipe lines 232, 234 on the mold 8, 8'side are hole-shaped female. Connection portions 232A and 234A, and male connection pipe 231A,
233A can be closely fitted via O-rings 245 provided on the female connection portions 232A and 234A. here,
One O-ring 245 may be provided, or three or more O-rings 245 may be provided.

As shown in FIG. 26B, the male connecting pipe 231A is planted on the movable plates 103 and 103 'in the same manner as the male connecting pipe 231A.
A planting hole 24 in which the base end portion of the movable plate 103, 103 'is provided.
O-ring 24 that is loosely inserted in 6 and is provided in the planting hole 246.
7. The small diameter portion 248 provided in the male connecting pipe 231A is flexibly fixed and supported in the support hole 250 of the elastic plate 249 such as a rubber plate provided in the movable plates 103 and 103 '. is there. Two or more O-rings 247 may be provided.
251 is a snap ring inserted in the small diameter portion 248, 2
52 is a movable plate 103, 103 'by a bolt (not shown)
Fixed to the movable plate 103, 103 '.
It is a holding plate that holds and holds.

Further, the blow cylinder air supply line 23
5, 236, blow cylinder air discharge pipelines 237, 2
As for 38, as shown in FIGS. 22, 24, and 25,
Male connecting pipes 235A and 237 in which the connection ends of the pipes 235 and 237 on the movable plate 103 side are planted in the movable plate 103.
A, the connection ends of the conduits 236, 238 on the die 8 side are hole-shaped female connection parts 236A, 238A, and the male connection pipe 23
5A and 237A can be closely fitted via O-rings (not shown) provided on the female connection portions 236A and 238A. Incidentally, the male connecting pipes 235A, 2 for the movable plate 103,
The planting structure of 37A is a flexible structure similar to that of the male connecting pipe 231A shown in FIG. 26 (B).

Further, the blown air supply pipe line 23
As for 9, 240, as shown in FIG. 22, FIG. 24, and FIG. 25, the connecting end of the pipe line 239 on the movable plate 103 side is a male connection pipe 239A planted in the movable plate 103, and the mold 8 side The connecting end of the pipe line 240 of the hole-like female connecting portion 240A
The male connecting pipe 239A can be closely fitted through an O-ring (not shown) provided on the female connecting portion 240A. Note that the male connecting pipe 239A is embedded in the movable plate 103 in the same flexible structure as in the male connecting pipe 231A shown in FIG. 26 (B).

The ejector cylinder air supply lines 241, 242 and the ejector cylinder air discharge line 2 are also provided.
As for 43 and 244, as shown in FIGS.
The connecting ends of the conduits 241 and 243 on the movable plates 103 and 103 'side are set as male connection pipes 241A and 243A which are planted on the movable plates 103 and 103' side, and the conduits 242 on the mold 8 and 8'side are formed. 244, the connecting end of the hole-shaped female connecting portion 242A,
244A, the male connecting pipes 241A and 243A can be closely fitted through O-rings (not shown) provided on the female connecting portions 242A and 244A. The movable plates 103, 1
The male connecting pipes 241A and 243A for 03 'have a flexible structure similar to that of the male connecting pipe 231A shown in FIG. 26 (B).

Here, each pair of ducts 231 and 232, 233 and 2 of the movable plates 103 and 103 'and the molds 8 and 8'are provided.
34, 235 and 236, 237 and 238, 239 and 24
0, 241, 242, 243, and 244, the male connecting pipes 231A, 233A, 235A, 237.
A, 239A, 241A, 243A and female connecting portion 232
A, 234A, 236A, 238A, 240A, 242
The connection direction with A and 244A is set in the same direction between the pair of conduits.

That is, in the blow molding machine 1, the pipe lines 231 and 2 on the side of the movable plates 103 and 103 'which are mold mounting plates.
33, 235, 237, 239, 241, 243 and the molds 8 and 8'side conduits 232, 234, 236, 238, 2
40, 242, 244 are used for the mold 8,
8'is hung by a hanging structure described later, and the molds 8, 8
In the process of mounting the both-side mounting convex portion 253 of the ‘′ so as to be inserted into the both-side mounting concave portions 254 of the movable plates 8 and 8 ′, the male connecting pipe 231A and the female connecting portion 232A and the like are male-female fitted. Can be connected smoothly.

Further, the male connecting pipe 231A and the like and the female connecting portion 232A and the like are fitted to each other via the O-ring 245 and the like, and at the same time, the liquid tightness or the air tightness can be maintained. Therefore, in order to secure the liquid tightness or the air tightness between the connecting portions, it is not necessary to perform the work of pinching the sealing material interposed between the connecting portions with a bolt or the like.

Further, when a plurality of pairs of conduits 231, 232, etc. are provided, the connecting direction of the male connecting pipe 231A, etc. and the female connecting portion 232A, etc. in each conduit pair 231, 232, etc. is between these conduit pairs. Since it is set in the same direction with, mold 8,
In the process of attaching 8 ′ to the movable plates 103 and 103 ′, the molds 8 and 8 ′ are connected to the movable plates 103 and 103 ′ in the connecting direction of the male connecting pipe 231A and the female connecting portion 232A and the like. All the pairs of pipelines can be connected only by bringing them close to each other.

Further, the male connecting pipe 231 and the like are connected to the movable plate 10.
Since it is flexibly planted in 3, 103 ', the movable plate 10
Even if the mounting and inserting positions of the molds 8 and 8 ′ with respect to 3, 103 ′ are rough, the male connecting pipe 231A and the like are not connected to the female connecting portion 23.
Male / female fitting can be started smoothly on 2A.

In the blow molding machine 1, the mold 8,
In the process of inserting the both-side mounting protrusions 253 of 8 ′ into the both-side mounting recesses 254 of the movable plates 103 and 103 ′, the movable plate 1
The pipe lines 231 and the like on the 03, 103 'side and the pipe lines 232 and the like on the molds 8 and 8'side are connected by male and female fitting as described above, and at the same time, the lower end positioning recesses of the molds 8 and 8' 255 is engaged with the lower end positioning projections 256 of the movable plates 103 and 103 ′, and the lower end surfaces of the molds 8 and 8 ′ are attached to the movable plates 103 and 103 ′.
After being positioned by placing it on the lower end receiving portion 257 of 103 ′, the dies 8 and 8 ′ are firmly fixed and held by the claws 259 of the hydraulic clamp device 258 on the movable plate 103 and 103 ′ side. Complete installation.

However, in the blow molding machine 1, the movable plates 103, 103 as the mold mounting plates are used when the molds are replaced.
The following is provided as a mold suspension structure for attaching / detaching the molds 8 and 8 ′ to / from the mold.

That is, each of the molds 8 and 8'is as shown in FIG.
As shown in FIG.
61, 261 ′ are provided, and both suspension locking parts 261 and 2 are provided.
It can be lifted by the left and right suspenders 262 locked to 61 '. In FIG. 22, 263 is a suspension wire and 264 is a crane.

Here, in the blow molding machine 1, the central position between both suspension locking portions 261 and 261 'is shown in FIG.
As schematically shown in (A), the molds 8 and 8'are set so as to be positioned on the line G of the total center of gravity G1 and G2 of the individual molds 8 and 8 '.

Further, one die 8'of the pair of dies 8, 8'includes a balance weight 265. The balance weight 265 on the side of the mold 8'is substantially balanced with the weight of the blower 202 on the side of the mold 8.

Further, the suspending tool 262 is composed of both suspension locking portions 26.
The part that rises from both ends of the locking pin 266 that is locked to the first and second parts 261 ′ is a mold opening restriction part 267. The respective mold opening restricting portions 267 are provided with the respective suspension locking portions 261 and 261 '.
To prevent the opening of the pair of molds 8 and 8 '.

That is, in the blow molding machine 1, both suspension locking parts 261 provided on the pair of molds 8 and 8 ',
Since the central position between 261 'is set to be located on the total center of gravity G line of the pair of molds 8 and 8',
The pair of metal molds 8 and 8 can be simply locked by suspending both of the suspension locking portions 261 and 261 ′ with the lifting tool 262 and lifting.
´ can be hung horizontally.

In the blow molding machine 1, the balance weight 265 is provided on one of the molds 8 ', so that the total center of gravity G line of the pair of molds 8 and 8'can be obtained. It is possible to make it substantially coincide with the mating surface of ′ ′, and as a result, the suspension locking portions 261 and 261 ′ provided on the respective molds 8 and 8 ′ can be installed close to each other near the mating surface thereof. Therefore,
It is possible to make the suspending tool 262 that locks on both of the suspension locking portions 261 and 261 'compact.

Further, in the blow molding machine 1, the suspension locking portions 261 and 261 'have the individual center of gravity G of the molds 8 and 8'.
1, when the molds 8 and 8'are lifted when not located on the G2 line, the gravity acting on the respective molds 8 and 8'causes a moment around the corresponding suspension locking portions 261 and 261 ', The pair of dies 8, 8'will try to open each other at their bottom. At this time, in the above-described embodiment, the mold opening restricting portion 267 of the suspending tool 262 has the double suspension locking portions 26.
1, 261 ′ engage with each side part of the mold 8,
Since the opening of 8'is prevented, the opening of the molds 8 and 8'can be prevented without using a special opening preventing tool. FIG.
In (B), the suspension locking portions 261 and 261 'have the respective molds 8 and 8
Located inside the individual centers of gravity G1 and G2 of
Suspension locking part 2 corresponding to the mold opening restriction part 267 on the outside of the
61, 261 'is in a state of being engaged with the outer side portions and preventing the opening of the pair of molds 8, 8'. In addition, FIG.
In (C), the suspension locking portions 261 and 261 'have respective molds 8 and 8
Located outside the individual centers of gravity G1 and G2 of
Of the outside die opening restriction portion 267A and the inside die opening restriction portion 267B correspond to the suspension locking portions 261 and 2 respectively.
This is a state in which the outer side portion and the inner side portion of 61 ′ are engaged with each other to prevent the pair of molds 8 and 8 ′ from opening.

[0073]

As described above, according to the present invention, a pair of molds can be horizontally hung with a simple structure , and
It is possible to prevent the mold from opening when lifting the mold.

[0074]

[Brief description of drawings]

FIG. 1 is a plan view of a rotary blow molding machine showing an embodiment of the present invention.

FIG. 2 is a side view of an extruder of the blow molding machine.

FIG. 3 is a front view of the extruder.

FIG. 4 is a rear view of the extruder.

FIG. 5 is a plan view of a parison cutting device of the blow molding machine.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a side view showing a part of the parison cutting device in section.

FIG. 8 is a side view of a mold clamping device of the blow molding machine.

FIG. 9 is a front view of a burr shape correcting mechanism of the blow molding machine.

FIG. 10 is a plan view of the burr shape correcting mechanism.

FIG. 11 is a side view of a molded product take-out device of the blow molding machine.

FIG. 12 is a side view of an upper burr grip and take-out mechanism of a molded product take-out device of the blow molding machine.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a front view of the above-described burr gripping and taking out mechanism.

FIG. 15 is a plan view of a suction gripping conveyance mechanism of the molded product take-out apparatus.

FIG. 16 is a side view of the suction gripping and conveying mechanism.

FIG. 17 is a front view of the suction gripping and conveying mechanism.

FIG. 18 is an enlarged side view of a mold clamping device of the blow molding machine.

FIG. 19 is a side view of an extruder according to another embodiment.

FIG. 20 is a side view of a mold provided with the same pre-sealing device.

FIG. 21 is a cross-sectional view showing a mold having the blow device and the ejector device built therein.

FIG. 22 is a perspective view showing a process of mounting the mold on the mold mounting plate.

FIG. 23 is a perspective view showing a completed mounting state of the mold on the mold mounting plate.

FIG. 24 is a perspective view showing the mold mounting plate.

FIG. 25 is a schematic view showing the same mold.

FIG. 26 is a schematic view showing the mold pipe connection structure.

FIG. 27 is a schematic diagram showing the same metal mold hanging structure.

[Explanation of symbols]

 1 Blow Molding Machine 8, 8'Mold 261, 261 'Suspension Locking Part 262 Suspension Tool 265 Balance Weight 267 Mold Opening Restriction Part

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Claims (2)

(57) [Scope of utility model registration request] 1. A mold-hanging structure for a molding machine, wherein a pair of molds is provided with a suspension locking portion, and the pair of molds is lifted by a suspending tool that is locked to both of the suspension locking portions. , center position between the two hanger locking portion, Ri Na is set to be positioned on their pair of mold overall gravity line, hangers
Is engaged with each side of both suspension locking parts to open the pair of molds.
A mold hanging structure for a molding machine, which is provided with a mold opening restricting portion for preventing the above . 2. The mold hanging structure for a molding machine according to claim 1, wherein a balance weight is provided on at least one of the pair of molds.