JPH0630429Y2 - Rotary blow molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotary blow molding machine for blow molding a detergent container, a cosmetic bottle, etc. from a parison.

[Conventional technology]

For example, Japanese Unexamined Patent Publication (Kokai) No. 63-256420 discloses a mold clamping device for a rotary blow molding machine in which a parison made of a thermoplastic resin is continuously molded into a hollow resin product with a pair of opening and closing molds. Has been done.

The mold clamping device of this rotary blow molding machine is provided with a base plate, a pair of guide shafts fixed on the base plate so as to be parallel to each other via a support block, and slidably mounted on the pair of guide shafts. And a pair of movable plates having the respective molds fixed to the opposite surfaces, a pair of clamp rods having one end fixed to the back side of the respective movable plates for contacting and separating the respective molds, A bracket erected at one end of the base plate is swingably supported via pivots located at approximately the same height as the guide shafts, and the upper end pivotally supports the other end of the one clamp rod and the lower end. And a swing lever having a portion protruding downward from the upper surface of the base plate, and slidably supported below the base plate, one end of which is pivotally supported by the other end of the one clamp rod of the swing lever. Slide rod,
The slide rod and the other clamp rod are generally configured by a connecting plate or the like connecting the other ends thereof.

After supplying the parison from the extruder, the turntable on which the pair of open / close molds clamped by the mold clamping device is placed is intermittently rotated by a motor to continuously produce hollow resin products. It is designed to be molded.

[Problems to be solved by the device]

However, in the mold clamping device of the conventional rotary blow molding machine, the pivot shaft of the rocking lever of the mold clamping device is positioned at the height of the pair of guide shafts, and the pair of the clamp rod and the slide rod are disposed substantially in the middle. Since the guide shaft is provided, the mold clamping force of the mold clamping device cannot be evenly divided between the pair of guide shafts and the base plate, and there is a drawback that an excessive load is applied to the base plate and the like. Further, a holding means having a complicated mechanism is required to hold the open / closed state of the pair of open / close dies.

Therefore, the present invention provides a rotary blow molding machine that can solve the above problems.

[Means for Solving the Problems]

Below the extruder for extruding the parison, a turntable for arranging a plurality of pairs of opening and closing molds for sandwiching and blow molding the parison is rotatably arranged, and a turntable is placed on the turntable through a base plate. In a rotary blow molding machine provided with a mold clamping device for opening and closing the pair of opening and closing molds, a pair of guides in which the mold clamping device is fixed on the base plate in parallel via a support block. Shafts, a pair of movable plates slidably provided on the pair of guide shafts, the molds being fixed to opposite surfaces, and one end fixed to the back side of each movable plate. A pair of clamp rods that abut and separate from each other, and a bracket that is erected at one end of the base plate so as to be swingable via pivots positioned below the height of each of the guide shafts. The other end of the clamp rod A swing lever that is pivotally supported and has a lower end portion protruding downward from the upper surface of the base plate, and a slidably supported lower portion of the base plate, one end of which is the other end of the one clamp rod of the swing lever. And a pivot rod supported at the lower end equidistant from the pivot shaft, a connecting plate connecting the other end of the slide rod and the other end of the other clamp rod, and the connecting plate reciprocating by a pair of actuators. The toggle mechanism is configured to be movable and to close the pair of opening / closing dies by the forward movement of the connecting plate, and to open the pair of opening / closing dies by the returning movement of the connecting plate to maintain their state. ing.

[Action]

The pivot shaft of the rocking lever of the mold clamping device is located below the height of the pair of guide shafts, and the distance from the pivot shaft to the pin pivot point of the intermediate link at the other end of the one clamp rod and the pivot shaft slide from the pivot shaft. Since the distance from the intermediate link of the rod to the pin pivot point is equal, and the pivot is provided midway between the position of the pair of guide shafts and the position of the upper surface of the base plate, the mold clamping force of the mold clamping device is increased. Is evenly divided by the pair of guide shafts and the base plate, so that the base plate and the like are not unduly loaded. Further, the open / closed state of the pair of open / close molds is reliably held by the toggle mechanism.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described in detail 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. This extruder 1
A pair of open / close dies 8 for sandwiching and blowing the molten parison 2 on a turntable 7 rotatably supported by a support shaft 6 (see FIG. 8) on a base 5 attached to 0. Six sets of 8'are mounted on each base plate 9, and a pair of opening and closing molds 8 and 8'of these six sets intermittently rotate in a section from station A to station F shown in FIG. Then, the molten parison 2 is formed into a molded product 2'which becomes, for example, a detergent container, a cosmetic bottle, etc.
The blow molding can be continuously performed (see FIG. 11).

As shown in FIGS. 1 to 4, the extruder 10 includes a lower base 11 and an upper base 12 provided on the base 11 so as to be horizontally rotatable with respect to the lower base 11 by a rotation drive mechanism 20. And an extruder main body 13 for reciprocating vertically on the upper base 12 by a vertical drive mechanism 30 and supplying the molten parison 2 into the pair of opening / closing dies 8, 8'when descending. ing.

As shown in FIGS. 1 to 4, the extruder main body 13 has a hopper 14 for charging a pellet-shaped thermoplastic resin (raw material) on the upper rear side thereof, and at the bottom of the hopper 14, A cylinder 18 having a screw 16 which is rotated by a motor 15 and the like and whose outside is heated by a heater (not shown)
have. The thermoplastic resin heated and melted in the cylinder 18 is turned into three tube-shaped molten parisons 2, 2, 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 is formed. ，
It is adapted to be simultaneously extruded and supplied into each of the three cavities of the same shape formed in 8 '. The number of molten parison 2 extruded from the extruder body 13 is not limited to three, and may be one, two, or four or more.

As shown in FIGS. 1 to 4, the swivel drive mechanism 20 includes guides 21 fixed at four corners of the upper surface of the lower base 11.
And guides 22 fixed to the four corners of the lower surface of the upper base 12 so as to be slidable with respect to the guides 21, and a slewing ring bearing (inner bearing) having inner teeth 23a on the inner peripheral surface. 23 is fixed to the upper surface of the lower base 11, and a drive gear 27 fixed to the shaft portion 26a is composed of a motor 26 that meshes with the inner teeth 23a 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 a rear portion of the upper base 12 and a rear portion of the extruder body 13, and a front portion of the upper base 12. And a front portion of the extruder main body 13, and a pair of shock absorbers 32, 32 interposed between the pair of brackets 33, 33 standing on the front side of the upper surface of the upper base 12 and having one end pivotally supported. The links 34, 34, a link 36 whose one end is axially supported by a pair of brackets 35, 35 hanging down to the front side of the lower surface of the extruder main body 13, and a bracket 37 erected on the upper surface of the upper base 12 are vertically swung. The pair of links 3 is rotatably supported and is attached to the U-shaped portion at the tip of the rod 38a.
A hydraulic cylinder 38 pivotally supported by pins so as to sandwich the other ends of the links 34 and 34 and the other end of the link 36.

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 ′. , 2, 2 are cut into a certain length so that the upper ends 2a, 2a, 2a of the two, 2 and 2 slightly project from the upper surfaces of the pair of opening / closing dies 8, 8 '. This parison cutting device 40
Is fixed to the extruder body 13 and fixed to the cylinder 18
A base plate 41 extending horizontally below the front part of the base plate, an air cylinder (actuator) 42 supported on the base part of the base plate 41 so as to be swingable in the left-right direction via a support shaft 43, and a central part of the shaft part 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, and the tip of the rod 42a of the air cylinder 42 is pivotally supported by a pin so that the rod 42a reciprocates back and forth in one direction (clockwise). Rotating plate 4 that rotates in
4, a mounting plate 47 fixed to the lower end of the shaft portion 44a of the rotating plate 44, and a cutter having a triangular tip attached to the upper surface of the front portion of the mounting plate 47 through a plurality of bolts 49 and the like. 48 and a cutter positioning mechanism 50 which is provided on the base plate 41 and is provided alongside the air cylinder 42 and the rotary plate 44 to determine the cutting start position (rotation start position) of the cutter 48. Then, the cutter 48 does not reciprocate but rotates in one direction,
Since the upper ends 2a, 2a, 2a of the molten parisons 2, 2, 2 are cut, the molten parisons 2, 2, 2 are cut.
Each of the two can be cut into a constant state, for example, a constant length. The upper end 2a of each molten parison 2 is left as an upper burr 2a '(burr at the mouth) on the upper part of the molded product 2'after blow molding.

As shown in FIGS. 5 and 6, the cutter positioning mechanism 50 includes a small air cylinder 51 fixed to the base plate 41 so as to be arranged substantially parallel to the air cylinder 42, and a support shaft 53 on the base plate 41. And a pair of links 52, 52 supported swingably on the recess 41a of the base plate 41, and the pair of links 52, 52 at both ends.
52 and the tip 51 of the rod of the air cylinder 51
An intermediate link 54 pivotally supported by a and a pair of links 52, 52 are rotatably supported via a support shaft 56 between the tips of the links 52, and have an arc shape formed on the outer periphery of the rotary plate 44. The roller 55 is configured to come into contact with and separate from the notch 44b so as to determine the cutting start position (rotation start point position) of the cutter 48.

The lower edge of the turntable rotatably supported on the base 5 via a support shaft 6 is mounted on a large number of bearings 60 standing on the base 5, and the turntable 7 has an outer periphery. The annular driven gear 61 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. The pair of idle gears 62, 62 mesh with a drive gear 66 attached to a speed reducer 65 of an AC servo motor 64 on the base 5. The drive gear 66 and the turntable 7
A pair of idle gears 6 are provided between the driven gears 61 on the outer periphery of the
Since the second and second gears are interposed, the backlash between the gears can be eliminated, and the turntable 7 can be intermittently rotated and positioned with high precision.

Further, as shown in FIGS. 1 and 8, from the position of the station B of the turntable 7 on the base 5 to the station E.
So that it straddles the turntable 7 to the position A gate-shaped frame 67 is erected. At the position of the station F of the turntable 7 on the base 5, a molded product container 67 and a chute 69 for storing the taken-out molded product 2'is provided upright. At the position of the station B of the turntable 7 of the gate frame 67, a burr for correcting the upper end 2a of the molten parison 2 before solidification protruding above the upper surfaces of the pair of open / close molds 8, 8'to a flat standing state. A shape correction mechanism 70 is provided. In addition, the above-mentioned molded product container 68
Upper frame 68a protruding above the turntable 7
Between the inner frame 68b and the middle frame 68b, the upper burr 2a 'of the molded product 2'is grasped and raised when the pair of open / close molds 8, 8'after hollow molding is opened, and then the molded product 2' A molded product take-out device 80 is provided for picking up the upper burr 2a 'and taking out the body 2b' while gripping it.

The burr shape correcting mechanism 70 is, as shown in FIGS. 8 to 10, a station B of the turntable 7 of the gate frame 67.
Of the pair of opening and closing molds 8 and 8 ', and the four guide bolts 73, ... Was A V-shaped mounting plate 74 and a pair of guide shafts 7 laid over both side portions 74a, 74a of the mounting plate 74.
Each molten parison 2,2,2 before solidification protruding through the upper surface of the pair of open / close dies 8,8 'by penetrating through 5,75 and sliding.
A pair of clampers 76, 76 for clamping the upper ends 2a, 2a, 2a of the mounting plate 74 to correct the flat standing state and the outer center of both side parts 74a, 74a of the mounting plate 74, and the tips of the rods 77a are mounted to It is composed of a pair of air cylinders 77, 77 which are fixed to the center of the clamper 76 and abut and separate the clampers 76 from each other.

Further, as shown in FIG. 11, the molded product take-out device 80 is arranged in the upper frame 68a of the product container 68, and when the pair of open / close molds 8, 8'after blow molding is opened,
An upper burr gripping and taking out mechanism 81 for gripping and ascending the upper burr 2a 'of each molded product 2'and a middle frame 68b of the above described molded product storage container 68 are raised by the upper burr gripping and taking out mechanism 81. A suction gripping and conveying mechanism 90 for sucking the upper burr 2a 'of each molded product 2'and gripping the body 2b' of the molded product 2'to rotate 180 ° to store the molded product 2'in the molded product storage container 68. It consists of and.

As shown in FIGS. 11 to 14, the upper burr gripping and taking out mechanism 81 includes an air cylinder 82 which is erected on the tip side of the upper frame 68a of the molded product container 68 and a rod 82a of the air cylinder 82. The rod 82 fixed to the tip
Approximately move vertically due to expansion and contraction of a A V-shaped mounting plate 83 and a pair of guide shafts 8 bridged on both side portions 83a and 83b of the mounting plate 83
A pair of open / close molds 8 when opened by sliding through 4,84
A pair of chucks 85 and 86 for gripping the upper burr 2a 'of the molded product 2'from within 8'and a central part of the inner surface of one side portion 83a of the mounting plate 83, and the tip of a rod 87a is attached to one chuck 86. Air cylinder 87 fixed in the center
And attached to both sides of the outer surface of the one side portion 83a of the attachment plate 83, and the tips of the rods 88a are fixed to both sides of the other chuck 85, respectively.
The three chuck pieces 89 and a pair of air cylinders 88, 88 for bringing the one chuck 86 into and out of contact with each other. The one chuck 85 is moved by the movement of the rods 87a, 88a of the air cylinders 87, 88.
The upper burr 2a 'of the molded product 2'is gripped by the three chuck pieces 89 and the other chuck 86, and the rod 82a of the air cylinder 82 is retracted to open and close the molded product 2'in a pair. It is designed to be taken out from the molds 8 and 8'and raised to a predetermined position below the upper frame 68a of the molded product storage container 68.

As shown in FIGS. 11 and 15 to 17, the suction gripping and conveying mechanism 90 includes a pair of arms 91 and 91 that rotate every 180 ° by a motor 92 that is erected on the middle frame 68b of the molded product container 68. A slide frame 94 slidably provided in the front-rear direction along a pair of guide shafts 93, 93 provided on both sides of the front end of each arm 91.
The tip of the rod 95a is fixed to the slide frame 94, and the slide frame 94 is moved forward and backward.
Attached to the front surface of the upper portion of the slide frame 94 at an equal distance,
The three suction pads 96 for vacuum-sucking the upper burr 2a 'of the molded product 2'and the lower front surface side of the slide frame 94 are equidistantly mounted, and each air cylinder 98 mounts the body 2b' of the molded product 2 '. Gripping or releasing grip 3
Each pair of gripping pieces 97, 97 is constituted.
Reference numeral 99 in FIG. 11 is a proximity switch. The proximity switches 99 cause the suction pads 96 and the pair of gripping pieces 97, 97 provided at the front ends of the pair of arms 91, 91, respectively. A pair of open / close molds 8,
The rotational positions of the pair of arms 91, 91 are determined so that they come on the 8'and the shooter 69 of the molded product container 68, respectively.

60 ° on the turntable 7 through 6 base plates 9
Six pairs of opening / closing molds 8 and 8'each of which is arranged at intervals.
Can be opened and closed by the mold clamping device 100 shown in FIGS. The mold clamping device 100 includes three support blocks 102 standing upright on the base plate 9 at equal intervals.
And a pair of guide shafts 101 and 101 fixed so as to be parallel to the horizontal direction via
A pair of movable plates 10 which are slidably provided on 1, 101 and have the above-mentioned molds 8 and 8'fixed on the opposite surfaces, respectively.
3, 103 ′, a pair of clamp rods 104, 104 ′, one end of which is fixed to the back side of each movable plate 103, 103 ′ to bring the molds 8, 8 ′ into and out of contact with each other, and the base plate. A bracket 106 which is erected at one end (outer side) of the shaft 9 is swingably supported via a pivot shaft 107 located below the height of each of the guide shafts 101, 101. Intermediate link 108 at the end
A rocking lever 10 having a pin pivotally supported via a lower end and a lower end protruding downward from an upper surface of the base plate 9 through an opening 9a.
5 and a pair of blocks 109 and 10 below the base plate 9.
The intermediate link 108 is slidably supported via 9 and has one end pivotally supported by the intermediate link 111 on the other end of the clamp rod 104 ′ of the swing lever 105.
Of the slide rod 110 and the other end of the clamp rod 104 of the other side through the opening 9b of the base plate 9, and the other end of the slide rod 110 that is pin-pivotally supported at the lower end that is equidistant from the other end of the pivot shaft 107. Brackets 1 connected to each other and erected at the other end (inside) of the base plate 9
The connecting plate 112 sliding along 13 and a pair of hydraulic cylinders (actuators) 114 and 115 hanging at positions corresponding to the stations A and F of the gate frame 67 make the connecting plate 112 reciprocate freely. The hydraulic cylinder 114 moves the connecting plate 112 forward to close the pair of opening / closing molds 8 and 8 ', and the other hydraulic cylinder 115 moves the connecting plate 112 back to open the pair of opening / closing molds. It is composed of a toggle mechanism 120 which opens 8, 8'and holds 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 thereof is the other hydraulic cylinder 1 described above.
The first link 121 is pressed by 15, and the other end is flipped upward, and the middle portion is pin-pivotally supported by the other end of the first link 121 and the other end is pivotally supported by the connecting plate 112. In addition, when the other end of the first link 121 is slid along the opening 113a of the bracket 113 and the other end of the first link 121 is flipped upward, the connecting plate 112 is returned and the roller 124 rotatably supported at one end. And a second link 123 that is pressed by the one hydraulic cylinder 114 to move the connecting plate 112 forward.

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, at Station F, as shown in Figure 18,
The pair of open / close molds 8 and 8 ′ from which each molded product 2 ′ is taken out by the molded product take-out 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'stops at the station A,
The pair of open / close molds 8 and 8'is closed by the mold clamping device 100 so as to sandwich the molten parisons 2, 2 and 2 already extruded to a predetermined length. That is, the roller 124 of the second link 123 of the mold clamping device 100 is pressed downward by the hydraulic cylinder 114, and the connecting plate 112 moves on the base plate 9 to the outer side (the outer side in the radial direction of the turntable 7) ( Move forward). 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 104 ′ moves the slide rod 110, the intermediate link 111, the swing lever 105, the intermediate link 108. And moves in the opposite direction to the one crimp rod 104 and pushes the other die 8'in the closing direction. Thereby, the pair of open / close molds 8,
8'is instantly closed by sandwiching the three molten parisons 2, 2, 2. At approximately the same time as the mold clamping of the pair of open / close molds 8 and 8 ', the cutter 48 is moved to the parison cutting device 40 by the forward / backward movement of the rod 42a of the air cylinder 42.
By rotating at high speed in one direction (clockwise direction) of the arrow in the figure, 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 into a constant state, for example, the same constant length. be able to. As a result, it is possible to easily monitor the cutting length of each molten parison 2, 2 and 2 and to control the feedback by the data processing.

Further, since the cutting start position of the cutter 48 is always positioned at the position shown by the solid line in FIG. 5 by the cutter positioning mechanism 50, the effect of always cutting each molten parison 2, 2, 2 into the same constant length is promoted. It

Substantially at the same time as the cutting of each of the molten parison 2, 2, 2, the die head 19 side of the extruder main body 13 of the extruder 10 is provided with a pair of hinges 31, 31 by a vertical drive mechanism 30, as shown in FIG. It rotates upward as a center and rises. As a result, when the pair of opening / closing dies 8, 8'rotates to the next station B, the molten parison 2, 2, 2 being extruded from the pair of opening / closing dies 8, 8'and the die head 19.
And will not interfere. When the pair of open / close dies 8, 8'rotates to a position where the molten parison 2, 2, 2 being extruded does 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 3
1, 31 as a center, the rod 38a of the hydraulic cylinder 38 of the up-and-down drive mechanism 30 retreats downward to rotate and descend, and when the next pair of opening and closing dies 8, 8'stops at the station A, each melting occurs. The molten parison 2, 2, 2 is continuously extruded from the die head 19 so that the parison 2, 2, 2 is extruded to a predetermined length.

Next, the AC servomotor 64 is driven to repeat intermittent rotation and stop from the station B to the station E at intervals of 60 ° with the pair of opening and closing molds 8 and 8'closed. A pair of open / close dies 8,8 '
Compressed air is blown into each of the molten parison 2 sandwiched between the pair of open / close molds 8, 8'by a blow needle (not shown) which has been stored in FIG. Cools the molded product 2'in a pair of open / close dies 8,8 '.

In this pair of open / close molds 8 and 8 ', since the blower for compressed air is not a blow pin but a blow needle,
The blow-pin cannot take out the molded product 2 '. Therefore, at 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 connected to the pair of burr shape correcting mechanisms 70. The upper ends 2a, 2 of the molten parison 2, 2, 2 are clamped by the clampers 76, 76 of
A and 2a are corrected to a flat upright state so that the molded product 2'can be easily taken out from the pair of open / close molds 8 and 8'by a molded product take-out device 80 described later.

Further, in each section from the station A to the station F, the turntable 7 having a large diameter (for example, 2700 mm) and a heavy weight (about 10 tons) includes an AC servo motor 64, a drive gear 66, a pair of idle gears 62, 62. , A turntable driving device including a driven gear 61 and the like intermittently rotates at high speed (for example, 2.5 seconds) (for example, 60 °).
(The section is rotated for 1.6 seconds and stopped for 0.9 seconds), and the pair of opening / closing dies 8, 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 periphery of the turntable 7 and a drive gear 66 that transmits the rotation of the AC servomotor 64.
Since 2 is interposed, backlash between gears can be eliminated. As a result, the turntable 7
It is possible to perform more accurate rotation and positioning when stopped.

When the pair of opening / closing molds 8 and 8 ′ come to 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, so that the pair of opening and closing molds are made. A molded product 2'projected from the upper surface of 8, 8'and corrected to a flat upright state by a burr shape correction mechanism 70
The upper burr 2a 'is attached to each chuck piece 89 of the chuck 85.
And chuck it. Almost at the same time as this gripping, the hydraulic cylinder 115 operates the mold clamping device 100 to open the pair of open / close molds 8 and 8 '. Then, the rod 82a of the air cylinder 82 of the upper burr gripping / unloading mechanism 81 is retracted to raise the pair of chucks 85, 86 to the suction gripping / transporting mechanism 90. 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 and conveying mechanism 90 is molded as described above. The lower portion of the pair of chucks 85, 86 of the upper burr 2a 'of the product 2'is securely sucked by vacuum, and the body 2b' is held by the pair of gripping pieces 97, 97 without shaking the molded product 2 '. Hold securely. Next, the arm 91 moves to the motor 92.
Thus, the finished molded product 2 ′ is stored in the molded product storage machine 68 by rotating 180 ° to release the suction and grip state.

The opening of the pair of open / close molds 8 and 8'by the mold clamping device 100 is performed by moving (returning) the connecting plate 112 in the direction opposite to the mold clamping. The pivot shaft 107 of the swing lever 105 of the mold clamping device 100 has a pair of guide shafts 10.
This axis 1 is located below the height of 1, 101 and
07 to the intermediate link 1 at the other end of the clamp lot 104 '
The distance from the pin pivot point of 08 and the distance from the pivot axis 107 to the pin pivot point of the intermediate link 111 of the slide rod 110 are equal, and the position of the pair of guide shafts 101 and the position of the upper surface of the base plate 9 are the same. Since the pivot shaft 107 is provided in the middle of, the mold clamping force of the mold clamping device 100 can be evenly divided between the pair of guide shafts 101, 101 and the base plate 9,
There is no unreasonable load applied to the base plate 9 or the like. The open / closed state of the pair of open / close molds 8 and 8'is determined by the first link 1
The toggle mechanism 120, which has a simple structure including the second link 123 and the second link 123, can be securely held.

Further, when the screw 16 of the extruder 10 is extracted for cleaning after the blow molding by the rotary blow molding machine 1 is completed, as shown by a two-dot chain line in FIG. The extruder main body 13 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. Also, since the extruder main body 13 is of a 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 driven by the vertical drive mechanism 30 to form a pair of hinges 31 and 3.
Although the extruder 10 is provided so as to be vertically movable around the center, the extruder 10 is not limited to this, and the extruder 1 according to another embodiment shown in FIG.
Like 0 ', the position of the pair of hinges 31', 31 'may be substantially the same as the height of the die head 19 (on the same horizontal plane) via the inverted V-shaped frame 3. This allows
Vibration of the die head 19 and 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.

[Effect of device]

As described above, according to the present invention, in the rotary blow molding machine in which the mold clamping device for opening and closing a plurality of pairs of opening and closing molds is arranged on the turntable via the base plate, the mold clamping device The pivot of the rocking lever is located below the height of the pair of guide shafts, and the distance from the pivot to the pin pivot of the intermediate link at the other end of the one clamp rod and the intermediate link of the slide rod from the pivot. Since the distance between the pin pivot point of the mold is equal, and the pivot is provided in the middle of the positions of the pair of guide shafts and the upper surface of the base plate, the mold clamping force of the mold clamping device is Since the guide shaft and the base plate can be evenly divided, an unreasonable load is not applied to the base plate and the like. Further, the open / closed state of the pair of open / close molds can be reliably held by the toggle mechanism having a simple structure.

[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, and FIG. Is the rear view of the extruder,
FIG. 5 is a plan view of the parison cutting device of the blow molding machine,
6 is a sectional view taken along the line VI-VI in FIG. 5, FIG. 7 is a side view showing a part of the parison cutting device in section, and FIG. 8 is a side view of the mold clamping device of the blow molding machine. 9 is a front view of the 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, and FIG. The figure is a side view of the upper burr gripping and removing mechanism of the molded product removing device of the blow molding machine, FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12, and FIG. 14 is a front view of the same burr gripping and removing mechanism. FIG. 15 is a plan view of the suction gripping and conveying mechanism of the molded product removing device, 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, and FIG. FIG. 19 is an enlarged side view of the mold clamping device of the blow molding machine, and FIG. 19 is a side view of the extruder of another embodiment. 1 ... Rotary blow molding machine, 2 ... (melting) parison,
7 ... Turntable, 8,8 '... A pair of open / close molds,
9 ... Base plate, 100 ... Mold clamping device, 101, 101 ...
A pair of guide shafts, 102 ... Support blocks, 103, 1
03 '... a pair of movable plates, 104, 104' ... a pair of clamp rods, 105 ... a swing lever, 106 ... a bracket, 107 ... a pivot, 110 ... a slide rod, 112 ... a connecting plate, 114 , 115 ... hydraulic cylinder (actuator), 120 ... toggle mechanism.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Sugiyama 6-45-5 Higashikasai, Edogawa-ku, Tokyo Dormy Kasai ▲ III ▼ 210 (56) References JP-A-63-256420 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A turntable, on which a plurality of pairs of opening and closing molds for sandwiching the parison and performing blow molding is mounted, is rotatably arranged below an extruder for extruding the parison, and on the turntable. In a rotary blow molding machine having a mold clamping device for opening and closing the pair of opening and closing molds via a base plate, the mold clamping device is fixed on the base plate in parallel via a support block. Paired guide shafts, a pair of movable plates slidably provided on the pair of guide shafts, the molds being fixed to opposite surfaces, and one end fixed to the back side of each movable plate. , A pair of clamp rods for abutting and separating the respective molds, and a bracket erected at one end of the base plate so as to be swingably supported via pivots positioned below the height of the guide shafts, One of the above clamps on top A swing lever having the other end of the lid pivotally supported and a lower end portion protruding downward from the upper surface of the base plate, and one end of the swing lever supported slidably below the base plate. Slide rod pivotally supported at the lower end equidistant from the other end of the clamp rod and the pivot, a connecting plate connecting the other end of the slide rod and the other end of the other clamp rod, and a pair of actuators. The connecting plate is made to reciprocate by means of which the forward and backward movements of the connecting plate close the pair of opening and closing molds, and the backward movement of the connecting plate opens the pair of opening and closing molds to maintain their state. A rotary blow molding machine characterized by being configured with a toggle mechanism.