JP2564225B2 - Method and system for taking out molded products from blow molding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a system for taking out a molded product from a blow molding machine for blow molding a detergent container, a cosmetic bottle and the like with a parison.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 50-111167 discloses a rotary blow molding machine in which a parison made of a thermoplastic resin is used to continuously mold hollow products made of resin. This rotary blow molding machine has a pair of rotating frames, and a plurality of pairs (8 pairs) of opening and closing dies that are opened and closed by a mold clamping device between the pair of rotating frames. Then, the parison is sequentially supplied to a pair of opening and closing molds located below the extruder by the extruder located above the pair of rotating frames, and after the molds are closed, the pair of rotating frames rotate in a predetermined direction. By doing so, the parison is torn off from the extruder, and after blow molding, the blow molded product is taken out from the pair of open / close molds opened by sandwiching the burr of the blow molded product by the chuck of the product take-out device. ing.

[0003]

However, in the conventional rotary blow molding machine, the parison supplied into the pair of open / close molds is torn off by the extruder when the pair of rotary frames rotates. Therefore, the burr at the upper end of the parison protruding above the upper surface of the pair of opening / closing dies easily bends toward the upper surface of the closed pair of opening / closing dies, and in this state it solidifies and blow-molds. Since it becomes a burr of the product, it has a drawback that it is difficult to be picked up by the chuck of the product extracting device and it is difficult to take it out.

Further, since the molded product taken out by the product take-out device is taken out and discharged to the downstream process without judging whether the molded product is good or defective, there is a possibility that the defective product may be mixed in the downstream process.

The present invention makes it possible to reliably take out a molded product under any continuous operation condition from the start-up of molding to normal operation without stopping the operation, and to classify a good product and a defective product. The purpose is to discharge.

[0006]

According to the present invention as set forth in claim 1, a die for sandwiching the parison is arranged below an extruder for extruding the parison, and the die is held above the upper surface of the die. In the method of taking out a molded product of a blow molding machine, which molds the parison with an upper burr by cutting it with a cutter, a step of correcting the upper end of the parison before solidification to a flat standing state, and a parison extrusion. Based on the process of judging whether the molded product is good or defective between the start stage and the molded product unloading stage, and grasping the upper burr of the molded product at the molded product unloading stage based on the judgment result of good or defective of the molded product However, the process of discharging the non-defective product to the non-defective product discharge destination and the defective product to the defective product discharge destination.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the defective judgment item of the molded article is (a) an item in which the parison at the time of molding start-up is defective.
(b) The parison length is out of the target length range, which causes the parison to be defective, (c) The blow gas supply abnormality during parison blow is defective, and (d) the downstream equipment following the molding machine. Items that cause abnormal operation are defective, (e) Items that have no molded product at the molded product ejection position are defective, and (f) That there is no lower burr at the molded product ejection position in the prescribed position are defective. Items, (g) Items that cause abnormalities in gripping the molded product body by the molded product unloading device, (h) Failure of the next molded product as a duplicate molded product due to the mold that was detected in (e) above as having no molded product The item is set to be at least one of the following items.

According to a third aspect of the present invention, a die for sandwiching the parison is arranged below an extruder for extruding the parison, and the parison is cut by a cutter at a position above the upper surface of the die. By this, in the molded product ejection system of the blow molding machine that molds with an upper burr on the upper part of the molded product, it is arranged above the mold and the burr shape that corrects the upper end of the parison before solidification to a flat upright state A corrector, a molded product take-out device that grips the upper burr of the molded product, and takes out the molded product from the mold, and determines whether the molded product is good or bad between the parison extrusion start stage and the molded product take-out stage. At the stage of taking out the molded product, the defective product determination control device for controlling the molded product takeout device is provided so that the good product is discharged to the good product discharge destination and the defective product is discharged to the defective product discharge destination.

According to a fourth aspect of the present invention, a die for sandwiching the parison is arranged below an extruder for extruding the parison, and the parison is cut by a cutter at a position above the upper surface of the die. Thereby, in the molded product take-out system of the blow molding machine that molds with an upper burr on the upper part of the molded product, it is arranged above the mold, and the upper end of the parison before solidification is corrected to a flat upright state, A molded product take-out device that grips the upper burr of the molded product and removes the molded product from the mold, and judges whether the molded product is good or defective between the parison extrusion start stage and the molded product take-out stage, and takes out the molded product. At the stage, a defective product determination control device for controlling the molded product take-out device is provided so that the non-defective product is discharged to the non-defective product discharge destination and the defective product is discharged to the defective product discharge destination.

[0010]

According to the present invention, there are the following actions (1) to (4). (1) Since the upper end of the parison protruding above the upper surface of the mold is corrected to a flat upright state before solidification, the upper burr can be reliably and easily gripped at the stage of taking out the molded product. Therefore, during any operation from molding start-up to normal operation, by grasping the upper burr regardless of the defective form of the molded product, etc., the molded product can be reliably operated under continuous operation without stopping the operation. You can take it out.

(2) Good / defective of the molded product is judged between the parison extrusion start stage and the molded product unloading stage, and at the molded product unloading stage, the good product is discharged to the good product discharge destination, and the defective product is discharged as the defective product. Discharge first. Therefore, not only in the molding process but also in the take-out process, good / defective determination is performed, and the good product and the defective product can be accurately classified and discharged.

(3) According to the above (1), a defective product at the time of startup of molding can be automatically taken out without stopping the machine, and as a result, automation of startup operation can be realized.

(4) Due to the above (1) and (2), the defective product during normal operation can be automatically taken out without stopping the machine, and the restarting operation due to the machine stop is unnecessary, and the defective product can be transferred to the downstream process. It is possible to realize continuous molding without mixing and discharging.

[0014]

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 a rear view of the extruder, FIG. 5 is a plan view of the parison cutting device of the blow molding machine, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a part of the parison cutting device. 8 is a side view of the mold clamping device of the blow molding machine, FIG. 9 is a front view of the burr shape correction mechanism of the blow molding machine, FIG. 10 is a plan view of the burr shape correction mechanism, and FIG. Is a side view of the molded product take-out device of the blow molding machine, FIG. 12 is a side view of the upper burr gripping take-out mechanism of the molded product take-out device of the blow molding machine, and FIG. 13 is XIII- in FIG.
A sectional view taken along line XIII, FIG. 14 is a front view of the same burr gripping and taking out mechanism, FIG. 15 is a plan view of a suction gripping and conveying mechanism of the molded product taking out device, and FIG. 16 is a side view of the suction holding and conveying mechanism.
7 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 of another embodiment, and FIG. 20 is provided with the pre-sealing device. FIG. 21 is a side view of the mold, FIG. 21 is a cross-sectional view showing the mold incorporating the blower device and the ejector device, FIG. 22 is a schematic diagram showing a molded product takeout control circuit, and FIG. 23 is a flowchart showing a molded product takeout control procedure. FIG. 24 is a schematic view showing a molded product discharge path, FIG. 25 is a front view of a reciprocating blow molding machine of another embodiment, and FIG. 26 is a side view of the blow molding machine.

In FIG. 1, reference numeral 1 is 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 FIGS. 1 to 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 pellet-shaped 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.

As shown in FIGS. 1 to 4, the turning drive mechanism 20 is fixed to each guide 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.

As shown in FIGS. 5 and 7, the parison cutting device 40 is disposed below the die head 19 and 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 the turntable 7 on the base 5 to the position of the station E so as to straddle the turntable 7. It is set up. A molded product discharging device 6 for discharging the molded product 2'taken out at the position of the station F of the turntable 7 on the base 5.
8 are erected. At the position of the station B of the turntable 7 of the gate frame 67, a pair of open / close molds 8,
A burr shape correction mechanism 70 for correcting the upper end 2a of the molten parison 2 before solidification protruding above the upper surface of 8'to a flat standing state is provided. In addition, between the upper frame 68a and the middle frame 68b protruding above the turntable 7 of the molded product discharging device 68, the molded product 2'when the pair of open / close dies 8, 8'after hollow molding is opened. After taking out and lifting the upper burr 2a 'of the molded product 2', the upper burr 2a 'of the molded product 2'is sucked and the body 2b' is taken out and taken out.
0 is provided.

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.

Further, the molded product take-out device 80 is shown in FIG.
As shown in FIG.
8a, a pair of open / close molds 8, 8 after blow molding
The upper burr gripping and removing mechanism 81 for gripping and ascending the upper burr 2a 'of each molded product 2'when the ′' is opened and the middle frame 68b of the molded product discharging device 68 are provided with the upper burr gripping and removing mechanism. The upper burr 2a 'of each molded product 2'which has been raised by 81 is adsorbed, and the body 2b' is gripped 1
It is composed of a suction gripping and conveying mechanism 90 which rotates 80 ° and conveys the molded product 2 ′ into the molded product discharging device 68.

The upper burr gripping and removing 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 discharging device 68,
A substantially U-shaped mounting plate 83 fixed to the tip of the rod 82a of the air cylinder 82 and moving in the vertical direction due to the expansion and contraction of the rod 82a, and a pair of both side portions 83a and 83b of the mounting plate 83. Guide shaft 8
A pair of open / close molds 8 and 8 when opened by sliding through 4 and 84
A pair of chucks 85, 86 for gripping the upper burr 2a 'of the molded product 2'from inside the ′, and one side portion 8 of the mounting plate 83.
An air cylinder 87 attached to the center of the inner surface of 3a and having the tip of a rod 87a fixed to the center of one chuck 86.
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.
Of the three chuck pieces 89 and a pair of air cylinders 88, 88 for contacting and separating the one chuck 86 with each other. Then, one of the chucks 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 grasped by the three chuck pieces 89 and the other chuck 86 at the upper end thereof, 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 to be raised to a predetermined position below the upper frame 68a of the molded product discharging device 68. 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 standing on the middle frame 68b of the molded product discharging device 68. , 91, and a pair of guide shafts 9 provided on both sides of the front end of each arm 91.
A slide frame 94 slidably provided in the front-rear direction along 3, 3 and a rod 95a on the slide frame 94.
Is fixed to the air cylinder 95 that moves the slide frame 94 back and forth in the front-rear direction by advancing and retracting the rod 95a, and is mounted on the front surface of the upper portion of the slide frame 94 at equal distances. Three suction pads 96 for vacuum-sucking the burr 2a 'and the slide frame 94.
Of the pair of gripping pieces 97, 97 which are attached to the front surface of the lower part of the vehicle at equal distances and which hold and release the body 2b 'of the molded product 2'by each air cylinder 98. There is. Incidentally, reference numeral 99 in FIG. 11 is a proximity switch, and each of the proximity switches 99 causes the pair of arms 9 to move.
The suction pads 96 and the pair of gripping pieces 97, 97 respectively provided at the front ends of the first and the first 91 are placed on the pair of open / close molds 8, 8'and the molded product discharging device 68, respectively. Further, the rotational positions of the pair of arms 91, 91 are respectively determined.

Six pairs of the opening and closing dies 8, 8'arranged at intervals of 60 ° on the turntable 7 through the six base plates 9 are the dies 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 thereof 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, 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 unloading 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 of the molten parisons 2, 2 and perform 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 approximately 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 ', since the compressed air suction device is not the blow pin but the blow needle, 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 discharged into the molded product discharging device 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, and the connecting plate 11 is opened.
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.

When the screw 16 of the extruder 10 is removed for cleaning after the blow molding by the rotary blow molding machine 1, as shown in the two-point transition of FIG. The extruder body 13 of the extruder 10 can be rotated by a predetermined angle by the rotation drive mechanism 20. As a result, the extruder main body 13 does not buffer 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, but the extruder 10 is 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 includes an extruder 10 for extruding and hanging a parison 2, a pre-sealing device 200 for pre-sealing one end of the parison 2, and a die head of the extruder 10 for pre-blowing compressed air into the pre-sealed parison 2. A pre-blowing device 201 built in 19 and a pair of molds 8 and 8'for sandwiching the parison 2 and closing both ends of the parison 2, and compression into the parison 2 closed in the molds 8 and 8 '. The blower 202 is built in the mold 8 so as to inject air until the parison 2 matches the cavities of the molds 8 and 8 '.

In the blow molding machine 1, the parison 2 extruded from the extruder 10 is hung down, and one end of the parison 2 is pinched by the pre-sealing device 200 to pre-seal, and the parison is pre-blowing device 201. 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 attached to 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 by 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'.

Further, in the blow molding machine 1, FIG.
The defective product determination control device 300 as shown in FIG.
The defective product determination control device 300 determines whether the molded product 2'is good or defective between the stage of starting the extrusion of the parison by the extruder 10 and the stage of taking out the molded product by the molded product removing device 80. Then, the defective product determination control device 300, at the stage of taking out the molded product,
The molded product take-out device 80 is controlled, and as a result, a good product falls onto the good product discharge conveyor 301 of the molded product discharge device 68, and a defective product is a defective product discharge chute 302 of the molded product discharge device 68.
The defective product is discharged to the defective product conveyor 303.

The arrangement relationship among the good product discharge conveyor 301, the defective product discharge chute 302, and the defective product discharge conveyor 303 of the molded product discharge device 68 is as shown in FIG. And
The defective product determination control device 300 causes the motor 92 of the suction gripping and conveying mechanism 90 that constitutes the molded product unloading device 80 to move each arm 91 including the suction pad 96 and the gripping piece 97 to the pair of molds 8 and 8 '. When rotating it 180 degrees from the top,
While monitoring the current position of the arm 91 detected by the arm position detector 304, if the molded product 2'is a good product,
The suction pad driver 305 is controlled at the timing when the suction pad 96 and the gripping piece 97 reach above the non-defective product discharge conveyor 301 by the rotation of 180 degrees, and the suction by the suction pad 96 to the upper burr 2a 'of the molded product 2'is released. Then, the cylinder driver 306 for the air cylinder 98 of the grip piece 97 is controlled to release the grip of the body 2b 'of the molded product 2'by the grip piece 97, and the good product is dropped onto the good product discharge conveyor 301. Molded product 2
When ′ is a defective product, the suction pad 96 and the gripping piece 9
7 at a specific timing in the middle of the 180 ° rotation, the suction pad driver 305 is controlled to eliminate suction by the suction pad 96 on the upper burr 2a ′ of the molded product 2 ′, and the cylinder driver 306 is controlled. Molded product 2 '
Release the grip by the gripping piece 97 on the body 2b 'of
The defective product is put into the intake of the defective product discharge chute 302 by centrifugal force.

Here, the defective product determination control device 300 determines the quality of the molded product 2'for each of the following items (a) to (h).

(A) Items that make the parison 2 defective at the time of molding start-up At the time of molding start-up, the parison 2 extruded from the die head 19 until the extruder screw rotation speed of the extruder 10 driven by the motor 15 becomes constant. The length at the time of mold clamping is shorter than the proper length, and the molded product 2'molded by the parison 2 is a defective product.

Here, the defective product determination control device 300 includes a screw rotation speed detector 31 for detecting the rotation speed of the motor 15.
The detection signal of 1 is obtained, and the defective signal is output until the extrusion screw rotation speed reaches the target rotation speed input to the input device 310.

(B) Items in which the parison length is out of the target length range causing the parison 2 to be defective. The parison thickness extruded from the extruder 10 imparts a desired thickness distribution to the product after blow molding. Therefore, the target parison length is controlled at a constant cycle. Therefore,
In order to obtain a highly accurate product wall thickness distribution by the parison wall thickness control which is operated in a constant cycle, it is necessary to secure a constant parison length at the mold clamping timing. Also, if the parison length is too large, the length of the lower end of the parison that protrudes from the molds 8 and 8'and becomes burr becomes too large.
Material loss is high. If the length of the parison is too small, the lower end of the parison cannot be clamped by the molds 8 and 8 ',
Blow molding becomes impossible.

Therefore, in the blow molding machine 1, the photoelectric tube 312 is installed below the die head 19 of the extruder 10 (see FIG. 1,
(See FIG. 10), the light-shielding timing of the parison 2 can be detected. Then, the parison 2 cutting timing by the cutter 48 of the parison cutting device 40 and the shading timing at which the parison 2 passes through the photocell 312 are obtained by the parison length detector 313, and the timing difference between them is obtained as the parison shading time, The parison length at the mold clamping timing of the parison 2 is obtained from the parison light-shielding time. As a result, the defective product determination control device 300 obtains the detection result of the parison length detector 313 and outputs a defective signal when the parison length is outside the target length range input to the input device 310. To do.

(C) Items that cause abnormal supply of blown gas at the time of blowing the parison When the pair of molds 8 and 8'is closed and compressed air is injected into the parison 2 by the blow needle 210, the compressed air is at a predetermined level. If it continues to flow in over time or if the air pressure falls below a predetermined pressure, the parison 2 is perforated and the molded product 2'is defective.

Therefore, the defective product determination control device 300 obtains the detection results of the blow air flow rate detector 314 and the blow air pressure detector 315 provided in the air supply path of the blow needle 210, and the blow air flow rate is input to the input device 310. When the flow rate is still detected after the predetermined time input into the input device 310 or the blow air pressure is detected to be lower than the predetermined pressure input into the input device 310, a defect signal is output.

(D) Items that cause abnormal operation of downstream equipment subsequent to the blow molding machine 1 When the molded product 2'is taken out by the molded product take-out device 80 and discharged to the downstream process, the downstream conveyor and the burr punching are performed. If downstream equipment such as a punching machine is not operating normally, discharge of the molded product 2 ′ will cause secondary trouble in the downstream process.

Therefore, the defective product determination control device 300 obtains the detection result of the downstream equipment abnormality detector 316, and the molded product 2 '
If there is an abnormality in the downstream equipment when the product is taken out by the molded product take-out device 80 and discharged to the downstream process, the molded product 2
′ Outputs a defect signal regardless of whether the device is good or bad.

(E) Item in which there is no molded product 2'at the molded product take-out position is defective. In the blow molding machine 1, the molded product take-out device 80 has the molds 8, 8 '.
A molded product presence detector 317 composed of a photoelectric tube or the like is installed at the take-out position where the molded product 2'is taken out (see FIG. 11).

In the defective product determination control device 300, when the molded product presence detector 317 does not detect the presence of the molded product 2'at the molded product removal timing by the molded product removal device 80, there is no desired molded product 2 '. As a thing, a defective signal is output.

(F) Item in which the lower burr 2c 'of the molded product 2'is not in a predetermined position at the molded product take-out position is a defect

The blow molding machine 1 is provided with a lower burr detector 318 composed of a photoelectric tube or the like at the take-out position where the molded product take-out device 80 takes out the molded product 2'from the molds 8, 8 '(see FIG. 11).

Then, the defective product determination control device 300 detects that the lower burr detector 318 does not have c'on the lower burr at the predetermined position of the molded product 2'at the molded product removal timing by the molded product removal device 80. When it does, it outputs a defective signal. When the lower burr 2c 'is not in a predetermined position, such as the lower end of the molded product 2'is wobbled, the lower burr c'
Will fall in the downstream process and cause an abnormality such as blocking the discharge path.

(G) Molded product 2'by the molded product removing device 80
Items that cause abnormal grip of body 2b '

The molded product take-out device 80 comprises an air cylinder 98.
A pair of gripping pieces 97 for the body 2b 'driven by
The cylinder 98 is provided with a molded product gripping detector 319 for detecting the open / closed position. The molded product gripping detector 319 detects the opening / closing angle of the gripping piece 97 by detecting the stroke position of the cylinder 98, and determines whether the gripping piece 97 is in the proper opening / closing position under the stroke state to be gripped. This makes it possible to detect an abnormal grip of the body 2b '.

Then, the defective product determination control device 300 obtains the detection result of the molded product grip detector 319 at the molded product unloading timing by the molded product unloading device 80, and the gripping piece 97 grips the closed side from the proper opening / closing position. If so, it is determined that the body 2b 'of the molded product 2'is in a partially collapsed molded state, and a defective signal is output.

(H) Item in which the next molded product 2'by the molds 8 and 8'in which the absence of the molded product 2'is detected in the above (e) is regarded as a duplicate molded product.

When the molded product 2'is not present at the molded product take-out position in the above (e), the corresponding molding dies 8 and 8'cannot be taken out, and the molded product 2'is retained and retained in the next molding cycle. There is a possibility of entering. Therefore, the defective product determination control device 300 uses the molds 8 and 8'for the next molded product 2 '.
Is determined to be a duplicate molded product, and a defective signal is output.

That is, in the defective product determination control device 300, as shown in FIG. 23, regarding all the items (a) to (h) in all processes from the parison extrusion start stage to the molded product take-out stage, The quality of the molded product 2'is determined. Then, according to the determination result, the molded product take-out device 80 is controlled at the timing when the molded product 2 ′ reaches the molded product take-out position,
As described above, non-defective products drop onto the non-defective product discharge conveyor 301,
Defective products are put into the defective product discharge conveyor 303 from the defective product discharge chute 302.

The operation of this embodiment will be described below. (1) Parison 2 protruding upward from the upper surface of the mold 8 or 8 '
Since the upper end of the upper burr 2a 'is corrected to a flat upright state before solidification, the upper burr 2a' can be reliably and easily gripped at the stage of taking out the molded product. Therefore, during any operation from the start-up of molding to the normal operation, by grasping the upper burr 2a 'regardless of the defective form of the molded product 2', the molding is performed under continuous operation without stopping the operation. The product 2'can be taken out reliably.

(2) Whether the molded product 2'is good or defective is determined between the parison extrusion start stage and the molded product unloading stage, and at the molded product unloading stage, the good product is discharged to the good product discharge destination (good product discharge conveyor). , Defective products to defective product discharge destination (defective product discharge conveyor)
To discharge. Therefore, not only in the molding process but also in the take-out process, good / defective determination is performed, and the good product and the defective product can be accurately classified and discharged.

(3) By the above (1), defective products at the time of molding startup can be automatically taken out without stopping the machine, and as a result, the startup operation can be automated.

(4) By the above (1) and (2), the defective product during normal operation can be automatically taken out without stopping the machine, and the restarting operation due to the machine stop is unnecessary, but the defective product can be transferred to the downstream process. It is possible to realize continuous molding without mixing and discharging.

In the practice of the present invention, at least one of the above items (a) to (h) can be set as the defect determination item for the molded product. In addition, as a defective judgment item of molded products,
Of course, items other than (a) to (h) may be adopted.

In FIGS. 25 and 26, 400 is a reciprocating blow molding machine, which comprises an extruder 401, a mold 402,
It has a molded product take-out device 403, a defective product discharge device 404, and a non-defective product discharge device 405.

The extruder 401 includes a hopper 406 and a cylinder 4 having a screw rotated by a motor 407 through a gear case 408.
09, a tubular molten parison made of a thermoplastic resin is extruded vertically downward from the extrusion head 410.

The mold 402 is supported by the mold clamping device 402A and can be opened and closed, and is inclined between the position just below the extrusion head 410 and the position just below the molding product unloading position A by the molding product unloading device 403. The guide rod 411 reciprocates diagonally in the vertical direction. Then, the parison extruded by the extrusion head 410 is placed on the die 400.
After sandwiching immediately below 10, the molded product take-out device 403
Is moved to a position just below the molded product take-out position A, and the parison is blow-molded by the operation of a blow device (not shown, which is incorporated in the mold 402 in this embodiment), and then an ejector device (not shown) is provided. In the example, the molded product can be discharged by the operation of (built in the mold 402). The part of the parison sandwiched between the molds 402 that protrudes above the upper surface of the molds 402 is cut by a cutter (not shown) when the parison is arranged below the extrusion head 410.

The molded product unloading device 403 is moved between a molded product unloading position A, a defective product discharging position B, and a non-defective product discharging position C by a motor 412. Then, the molded product takeout device 40
3 can be lifted and lowered by the lifting cylinder 413,
It is provided with a pair of chucks 414 that can be opened and closed by an air cylinder (not shown). Molded product take-out device 403
(A) The upper end of the molten parison before solidification, which protrudes above the upper surface of the mold 402 set at the molded product take-out position A, is clamped by the chuck 414 and corrected to a flat upright state to form an upper burr. Performs a burr shape correction function. Further, the molded product take-out device 403 continues to clamp the upper burr formed in (b) above (a) with the chuck 414,
It has a function of taking out a molded product from the mold 402, the molded product being discharged after the completion of the blow molding in the mold 402.

The defective product discharge device 404 is composed of a defective product discharge chute 421 and a defective product receiving box 422 arranged below the defective product discharge position B, and the clamp by the chuck 414 of the molded product discharge device 403 is released. Accept defective products.

The non-defective product discharging device 405 includes a non-defective product discharging chute 423 disposed below the non-defective product discharging position C and the aligning device 4.
24 and a non-defective article discharge conveyor 425, and the non-defective article whose clamp is released by the chuck 414 of the molded article take-out device 403 is carried out to the lower step.

Further, the blow molding machine 400 has a defective product determination control device 300 similar to that of the blow molding machine 1 described above. The defective product determination control device 300 is
During the step of starting the parison extrusion by the extruder 401 to the step of taking out the molded product by the molded product take-out device 403, it is judged whether the molded product is good or bad, and at the molded product take-out stage, the good product is discharged to the good product discharge device 405, and The molded product take-out device 403 is controlled so that the non-defective product is discharged to the defective product discharge device 404.

Therefore, in the blow molding machine 400,
It operates as in (1) to (5) below. (1) The mold 402 rises just below the extrusion head 410 and is clamped to sandwich the molten parison. After that, the portion of the molten parison protruding above the upper surface of the die 402 is cut by a cutter.

(2) The parison is blow-molded by the blower while the mold 402 descends or descends just below the molded product take-out position A.

(3) Simultaneously with the start of blow molding in (2) above,
The chuck 414 of the molded product take-out device 403 is lowered at the molded product take-out position A, and the upper end of the cut parison is clamped by the chuck 414 to hold the upper burr in the flat standing state.

(4) The mold 402 is opened, the chuck 414 of the molded product take-out device 403 is raised at the taken-out position A of the molded product, and the molded product is taken out.

The defective product judgment control device 300 judges whether the molded product is good or defective between the parison extrusion start stage by the extruder 401 and the molded product takeout stage by the molded product takeout device 403.

(5) The defective product judgment control device 300 controls the molded product take-out device 403 based on the above-mentioned good / defective judgment result, laterally moves the molded product take-out device 403, and the non-defective product discharge device 405. The defective product is discharged to the defective product discharging device 404.

In the practice of the present invention, the rotary blow molding machine can also be equipped with a molded product take-out device having both a burr shape correction function and a molded product take-out function.

In the practice of the present invention, the reciprocating blow molding machine is also equipped with two devices, a burr shape correcting device and a molded product unloading device, each of which has a burr shape correcting function and a molded product unloading function. be able to.

[0091]

As described above, according to the present invention, the molded product can be reliably taken out under any continuous operation condition from the start-up of molding to the normal operation without stopping the operation. Good products and defective products can be sorted and discharged.

[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 schematic diagram showing a molded product takeout control circuit.

FIG. 23 is a flowchart showing a molded product takeout control procedure.

FIG. 24 is a schematic diagram showing a molded product discharge path.

FIG. 25 is a front view of a reciprocating blow molding machine of another embodiment.

FIG. 26 is a side view of the blow molding machine.

[Explanation of symbols]

 1,400 Blow molding machine 2 Parison 2'Molded product 8, 8 ', 402 Mold 10,401 Extruder 70 Burr shape correction device 80 Molded product removal device 300 Defective product judgment control device 301,425 Good product discharge conveyor (good product discharge) 303) Defective product discharge conveyor (defective product discharge destination) 403 Molded product unloading device 422 Defective product receiving box (defective product discharge destination)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Akimoto 2166, Kami-Gamo, Kamimikawa-cho, Kawachi-gun, Tochigi Ka-Kamikawa, 1-509 (72) Inventor Mitsuo Yamanoi 117, Koshido-cho, Southern Cross-Race 205, Koshido-cho, Utsunomiya, Tochigi No. (72) Inventor Minoru Oizumi 6-12-12 Minamikasai, Edogawa-ku, Tokyo 5-505 Omiya Corporation

Claims (4)

(57) [Claims] 1. A mold for sandwiching the parison is arranged below an extruder for extruding the parison, and the parison is cut by a cutter at a position above the upper surface of the mold to obtain an upper portion of a molded product. In the method of taking out the molded product of the blow molding machine that molds with the upper burr, the process of correcting the upper end of the parison before solidification into a flat upright state, and the process of removing the molded product from the parison extrusion start stage to the molded product removal stage. Based on the process of judging good / defective and the result of judgment of good / defective of the molded product, the upper burr of the molded product is grasped at the stage of taking out the molded product, the good product is discharged to the good product discharge destination, and the defective product is A method for ejecting a molded product from a blow molding machine, comprising: discharging the defective product to a discharge destination. 2. The defective judgment item of the molded article is (a) an item in which the parison at the time of molding startup is defective, and (b) an item in which the parison whose parison length is outside the target length range is defective.
(c) Items that cause abnormal blown gas supply during parison blow, (d) Items that cause abnormal operation of downstream equipment following the molding machine, and (e) No molded product at the molded product ejection position. (F) The item where the lower burr of the molded product is not in the specified position at the molded product take-out position is a defect, (g) The item where the molded product body gripping abnormality by the molded product take-out device is a defective item,
The molded product of the blow molding machine according to claim 1, wherein (h) at least one of the following items (e) is an item in which the next molded product by the mold that is detected to have no molded product is defective as a duplicate molded product. How to take out. 3. A mold for sandwiching the parison is arranged below an extruder for extruding the parison, and the parison is cut by a cutter at a position above the upper surface of the mold so that the parison is above the molded product. In a molded product take-out system of a blow molding machine for molding with an upper burr, a burr shape correction device that is arranged above the mold and corrects the upper end of the parison before solidification to a flat upright state, Grab the burr,
A molded product take-out device for taking out the molded product from the mold and a good / good condition of the molded product between the parison extrusion start stage and the molded product take-out stage.
It has a defective product determination control device that controls the molded product ejection device so that defective products can be discharged to the defective product discharge destination and defective products can be discharged to the defective product discharge destination at the stage of discharging defective products. Characteristic blow molding machine take-out system. 4. A mold for sandwiching the parison is arranged below an extruder for extruding the parison, and the parison is cut by a cutter at a position above the upper surface of the mold so that the parison is provided above the molded product. In a molded product take-out system of a blow molding machine that molds with an upper burr, it is arranged above the mold and corrects the upper end of the parison before solidification to a flat upright state and grips the upper burr of the molded product. Then, the molded product take-out device that takes out the molded product from the mold and the good / defective of the molded product is judged between the parison extrusion start stage and the molded product take-out stage, and at the molded product take-out stage, the good product is the good product discharge destination. Discharged to
A molded product unloading system for a blow molding machine, comprising: a defective product determination control device that controls a molded product unloading device so that a defective product is discharged to a defective product discharge destination.