JPH0497826A - Blow molding machine - Google Patents

Abstract

PURPOSE:To revise the upper end of parison, which is prior to solidification, projected upward from the top of a mold into a flat and rising state, by a method wherein a deburring mechanism revising the upper end of the parison, which is prior to solidification, into the flat and rising state is arranged. CONSTITUTION:A deburring mechanism 70 is arranged on a position of a turntable 7 of a portal frame 67. The tip part of the deburring mechanism 70 is fixed to a bracket 71 fixed to the upper part between a part of opening and closing molds 8, 8 by nuts 72 each. A U-shaped fitting plate 74 is fitted to suspend four guide bolts 73,... and the lower ends of the guide bolts each. Then the upper ends 2a, 2a, 2a of molten parison each which are before solidification, penetrated, slid through a pair of guide shafts 75, 75 placed across both side parts 74a, 74a of a fitting plate 74 and projected through upward of the tops of a pair of the opening and closing molds 8, 8 are clamped. The title machine is constitute of a pair of clamps 76, 76 revising the upper ends of the parison into a flat and rising state by clamping them and a pair of air cylinders 77, 77 causing the clamps 76 each to perform abutting and separation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blow molding machine for blow molding detergent containers, makeup skin, etc. from parisons.

[Conventional technology]

For example, Japanese Unexamined Patent Publication No. 50-111167 discloses a rotary blow molding machine that continuously molds resin hollow articles using a parison made of thermoplastic resin. This rotary blow molding machine has a pair of rotating frames, and a plurality of sets (eight sets) of opening/closing molds that are opened and closed by a mold clamping device between the pair of rotating frames.

Then, the parisons are sequentially supplied from the extruder located above the pair of rotating frames to the pair of opening/closing molds located below the extruder, and after the molds are closed, the pair of rotating frames rotate in a predetermined direction. As a result, the parison is torn from the extruder, and after blow molding, the blow molded product is taken out from a pair of opening and closing molds that are opened with the paris of the blow molded product sandwiched between them by the chuck of the product removal device. There is.

[Problem to be solved by the invention]

However, in the above-mentioned conventional rotary blow molding machine, the parison supplied into the pair of opening/closing molds is torn off by the extruder when the pair of rotating frames rotate. The part of the upper end of the parison that protrudes above the top of the mold tends to bend over the closed pair of opening/closing molds, and in this state it solidifies and forms the part of the blow-molded product, making it difficult to remove the product. The drawback is that the device's chuck makes it difficult to pinch and take out.

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

[Means for solving the problem] A mold for holding the parison is disposed below an extruder that extrudes the parison, and the parison is cut with a cutter at a position above the upper surface of the mold. In a blow molding machine that molds a molded article so as to have an upper paris on the upper part thereof, a paris shape correction mechanism is disposed above the mold for correcting the upper end of the parison before solidification into a flattened state. .

[Effect]

The upper end of the parison, which protrudes above the upper surface of the mold, is corrected into a flattened state by a parison shape correction mechanism before solidification.

〔Example〕

Hereinafter, one 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 that extrudes a tubular molten parison 2 made of thermoplastic resin vertically downward. This extruder 1
A pair of open/close molds 8° are used to hold the molten parison 2 and blow mold it on a turntable 7 which is rotatably supported on a base 5 attached to the base 5 via a support shaft 6 (see FIG. 8). Six sets of molds 8' are mounted on each base plate 9, and each pair of opening/closing molds 8, 8' in each of the six sets is intermittently rotated in the section from station A to station F shown in FIG. By sequentially turning the molten parison 2, the molded article 2' becomes, for example, a detergent container, a makeup skin, etc.
(See Fig. 11) Continuous blow molding can be performed.

As shown in FIGS. 1 to 4, the extruder 10 includes a lower base 11 and an upper base provided on the lower base 11 so as to be pivotable in the horizontal direction with respect to the lower base 11 by a pivot drive mechanism 20. 12, and an extruder main body 13 which is placed on the upper base 12 and reciprocated in the vertical direction by a vertical drive mechanism 30 to supply the molten parison 2 into the pair of opening/closing molds 8° 8' when descending. has been done.

As shown in FIGS. 1 to 4, this extruder main body 13 has a hopper 14 on the upper rear side into which pelletized thermoplastic resin (raw material) is charged, and at the bottom of this hopper 14, A cylinder 18 has a built-in screw 16 that is rotated by a motor 15 or the like, and the outside is heated by a heater (not shown).
have. The thermoplastic resin heated and melted in this cylinder 18 is transferred into three tubular molten parisons 2.2.2 by a tubular push-in head 19 provided at the tip of the cylinder 18, and a pair of vertically downward opening/closing molds 8. ,8
' The material is simultaneously extruded and supplied into each of the three cavities of the same shape formed within the cavity. Note that the molten parison 2 extruded from the extruder main body 13
is not limited to three, and may be one, two, or four or more.

As shown in FIGS. 1 to 4, the rotation drive mechanism 20 includes guides 21 fixed to four corners of the upper surface of the lower base 11.
, guides 22 fixed to the four corners of the lower surface of the upper base 12 and slidable relative to the guides 21, and a slewing ring bearing (inner bearing) having internal 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 a shaft portion 26a 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, 31 provided between the rear part of the upper base 12 and the rear part of the extruder main body 13, and a front part of the upper base 12. A pair of shock absorbers 32.32 are interposed between the front part of the extruder body 13 and a pair of shock absorbers 32.32, and a pair of brackets 33. A link 34, 34, a link 36 whose one end is pivotally supported by a pair of brackets 35, 35 hanging down on the front side of the lower surface of the extruder main body 13, and a bracket 37 which stands up on the upper surface of the upper base 12, swings in the vertical direction. The pair of links 34 are freely supported, and are attached to the U-shaped portion at the tip of the rod 38a.
．． The hydraulic cylinder 38 is pivotally supported by a pin so as to sandwich the other end of the link 34 and the other end of the link 36.

Further, as shown in FIGS. 5 and 7, the parison cutting device 40 is arranged below the die head 19 to cut three molten parisons 2 supplied into the pair of opening/closing molds 8, 8'. ．． 2. 2 upper end 2a.

The molds 2a and 2a are each cut to a certain length so that they slightly protrude from the upper surface of the pair of opening/closing molds 8 and 8'.

This parison cutting device 40 includes a base plate 41 fixed to the extruder main body 13 and extending horizontally below the front part of the cylinder 18, and a support shaft 43 on the base of the base plate 41 for swinging in the left-right direction. A movably supported air cylinder (actuator) 42 and a shaft portion 44a
the center thereof is fitted into 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 fixed to a rotary plate 44 which is pivoted by a pin and rotates in one direction (clockwise) by the forward and backward movement of the rod 42a, and the lower end of a shaft portion 44a of the rotary plate 44. mounting plate 47 and this mounting plate 4.
A cutter 48 with a triangular tip is attached to the front upper surface of the cutter 48 via a plurality of bolts 49, etc., and an air cylinder 42 and a rotary plate 44 are provided on the base plate 41, and the cutter 48 has a cutting start position. (Rotation start point position)
The cutter positioning mechanism 50 determines the position of the cutter. The cutter 48 does not reciprocate but rotates in one direction to cut the upper end 2a, 2a, 2a of each molten parison 2.2.2. 2.2 can be cut in a constant state, for example, to a constant length. Incidentally, 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 FIG. 5.6, the cutter positioning mechanism 50 includes a small air cylinder 51 fixed to a base plate 41 so as to be substantially parallel to the air cylinder 42, and a support shaft 53 mounted on the base plate 41. A pair of links 5252 are swingably supported on the recess 41a of the base plate 41, and both ends are connected to the pair of links 52.5.
2 and the tip 51a of the rod of the air cylinder 51
an intermediate link 54 which is pivotally supported by a pin, and an arcuate notch formed on the outer periphery of the rotary plate 44, which is rotatably supported via a support shaft 56 between the tips of the pair of links 52 and 52; The roller 55 is configured to come into contact with the portion 44b and to be able to move away from the roller 55 to determine the cutting start position (rotation start position) of the cutter 48.

The periphery of the lower surface of the turntable 7 rotatably supported on the base 5 via a support shaft 6 rests on a number of bearings 60 erected on the base 5. The annular driven gear 61 is fixed. This driven gear 61 meshes with a pair of idle gears 62, 62 rotatably supported via respective support shafts 63 erected on the base 5. Further, the pair of idle gears 62, 62 mesh with a drive gear 66 attached to a reduction gear 65 of the AC servo motor 64 on the base 5. This drive car 66 and the turntable 7
a pair of idle gears 62 between the driven gear 61 on the outer periphery of the
．． 62, it is possible to eliminate backlash between the respective gears, and the intermittent rotation of the turntable 7 and positioning when stopped can be performed with high precision.

Further, as shown in FIG. 1.8, a mouth-shaped gate frame 67 is erected from the station B position of the turntable 7 on the base 5 to the station E position so as to straddle the turntable 7. be.

Further, at the position of station F of the turntable 7 on the base 5, a molded product storage container 68 and a chute 69 for storing the taken out molded products 2' are provided upright. At the station B of the turntable 7 of the gate frame 67, there is a burr shape correction for correcting the upper end 2a of the unsolidified molten parison 2 protruding above the upper surface of the pair of opening/closing molds 88' into a flattened state. A mechanism 70 is provided. Also,
Between the upper frame 68a and the middle frame 68b that protrude above the turntable 7 of the molded product storage device 68, there is a space between the upper frame 68a and the middle frame 68b that are placed above the molded product 2' when the pair of opening/closing molds 8.8' are opened after the hollow molding. A molded product take-out device 80 is provided which, after gripping and raising the body 2 a l , sucks the upper burr 2 a ′ of the molded product 2 ′ and takes it out while gripping the body 2 b ′.

As shown in Figs.
Four guide bolts 73 whose tips are fixed by nuts 72 to a bracket 71 fixed above the middle of the pair of opening/closing molds 8, 8' are suspended. ...and the opening-shaped mounting plate 7 attached to the lower end of each guide bolt 73.
4, and the rack passes through and slides a pair of guide shafts 75.75 that are passed on both sides 74a, 74a of this mounting plate 74, and solidifies the molds 8.8' to protrude above the upper surfaces of the pair of opening/closing molds 8.8'. Each melted parison in front 2. 2. 2 upper ends 2a, 2a,
a pair of clampers 76, 76 for clamping 2a to correct it to a flat standing state; and both sides 7 of the mounting plate 74.
4a, 74a, each rod 77a
a pair of air cylinders 77 .
It consists of 7.

Further, as shown in FIG. 11, the molded product take-out device 80 is disposed on the upper frame 68H of the molded product storage container 68, and when the pair of opening/closing molds 8.8' are opened after blow molding,
An upper burr gripping and extraction mechanism 81 that grips and raises the upper burr 2a of each molded product 2' and an upper burr gripping and extraction mechanism 81 that is disposed on the middle frame 68b of the molded product storage container 68 and that is raised by the upper burr gripping and extraction mechanism 81. a suction gripping and conveying mechanism 90 that suctions the upper burr 2a' of each molded product 2', grips the body 2b' of the molded product 2', rotates 180 degrees, and stores the molded product 2' in the molded product storage container 68; It consists of

As shown in FIGS. 11 to 14, the upper burr gripping and extraction mechanism 81 includes an air cylinder 82 erected on the tip side of the upper frame 68a of the molded product storage device 68, and a rod 82a of the air cylinder 82. fixed at the tip of the rod 82
A substantially square-shaped mounting plate 83 that moves vertically by expansion and contraction of a, and both side parts 83a, 8 of this mounting plate 83.
3b, the rack passes through a pair of guide shafts 84 and 84.

Molded product 2 from inside the pair of opening/closing molds 8, 8' when sliding and opening
A pair of chucks 85 and 86 that grip the upper part 2a'
is attached to the center of the inner surface of one side 83a of the mounting plate 83, and the tip of the rod 87a is connected to one chuck 86.
An air cylinder 87 is fixed at the center of the mounting plate 83, and an air cylinder 87 is mounted on both sides of the outer surface of one side 83a of the mounting plate 83, and the tips of each rod 88a are fixed to both sides of the other chuck 85. It is composed of three chuck pieces 89 and a pair of air cylinders 88 and 88 that bring one of the chucks 86 into contact with and separate from them. And lots 87a and 88 of each of the air cylinders 87 and 88.
The upper burr 2a of the molded product 2' is formed by the three chuck pieces 89 of one chuck 85 and the other chuck 86 due to the movement of the chuck a.
′ by the upper end and remove the rod 82a of the air cylinder 82.
A pair of opening and closing molds 8.8 when the molded product 2' is opened due to leaving work.
Take out the upper frame 68 of the molded product storage container 68.
It is designed to be raised to a predetermined position below a.

As shown in FIGS. 1115 to 17, the suction gripping and conveying mechanism 90 includes a pair of arms 91 and 91 that rotate every 180 degrees by a motor 92 that is installed upright on the middle frame 68b of the molded product storage device 68, and a slide frame 94 provided so as to be slidable in the front-back direction along a pair of guide shafts 93 and 93 provided on both sides of the front end of the arm 91;
The tip of a rod 95a is fixed to this slide frame 94,
An air cylinder 95 that reciprocates the slide frame 94 in the front and back direction by the forward and backward movement of the rod 95a is attached to the upper front surface of the slide frame 94 at an equal distance apart, and vacuum sucks the upper part 2a' of the molded product 2'. three sets of suction pads 96, which are mounted at equal distances from each other on the lower front side of the slide frame 94, and each air cylinder 98 grips or releases the grip on the body 2b' of the molded product 2'. Each pair of gripping pieces 97 and 97. Incidentally, reference number 99 in FIG. 11 is a proximity switch, and each proximity switch 99 causes each of the suction pads 96 and each pair of gripping pieces 97 and 97 provided at each front end of the pair of arms 91 and 91 to The rotational positions of the pair of arms 9191 are determined so that the arms 9191 are positioned above the opened pair of opening/closing molds 8, 8' and above the shooter 69 of the molded product storage container 68, respectively.

60″ on the turntable 7 through six base plates 9.
Each of the six pairs of opening/closing molds 8, 8' arranged at intervals
is openable and closable by a mold clamping device 100 shown in FIGS. 8 and 18. This mold clamping device 100 consists of three support blocks 102 that stand upright at the center of the base plate 9 at an equal distance apart.
A pair of guide shafts 101, 101 fixed so as to be parallel to each other in the horizontal direction via
A pair of movable plates 103 which are slidably provided at 101 degrees and have the molds 8 and 8' fixed to opposing surfaces, respectively.
．． 103', a pair of clamp rods 104, 104', one end of which is fixed to the back side of each of the movable plates 103 and 103', for bringing the molds 8 and 8' into contact with each other and separating them from each other; It is swingably supported by a bracket 106 erected at one end (outside) via a pivot 107 located below the height of each of the guide shafts 101 and 101, and the other end of one of the clamp rods 104' is attached to the upper end. intermediate link 10
A swinging lever 1 is pivotally supported by a pin via a lever 8 and has a lower end projecting downward from the upper surface of the base plate 9 through an opening 9a.
05, and a pair of blocks 109.1 below the base plate 9.
09, and one end of which is supported by a pin on the other end of the clamp rod 104' of the swing lever 105 via an intermediate link 111.
A slide rod 110 is pivotally supported by a pin at a lower end spaced apart from the other end of 8 and the pivot shaft 107 at a distance equal to the distance between the other end of the slide rod 110 and the other clamp rod 104 through the opening 9b of the base plate 9. A connecting plate 112 that connects the other ends and slides along a bracket 113 that stands up on the other end (inside) of the base plate 9, and a gate frame 67.
A pair of hydraulic cylinders (actuators) 114 and 115 suspended at positions corresponding to stations A and F of
The connecting plate 112 is made reciprocally movable, and one hydraulic cylinder 114 moves the connecting plate 112 forward to close the pair of opening/closing molds 8.8', and the other hydraulic cylinder 115 closes the connecting plate 112. It is constituted by a toggle mechanism 120 that moves the plate 112 backward to open the pair of opening/closing molds 8.degree. 8' and maintain these states.

This toggle mechanism 120 is rotatably supported in the vertical direction via a support shaft 122 by a bracket 113 that stands up on the other end (inside) of the base plate 9, and one end is attached to the other hydraulic cylinder 1.
The first link 121 is pressed by the first link 15 and the other end springs upward; The roller 124 is slid along the opening 113a of the bracket 113, and when the other end of the first link 121 springs upward, the connecting plate 112 is moved back, and the roller 124 is rotatably supported at one end. and a second link 123 that is pressed by one of the hydraulic cylinders 114 to move the connecting plate 112 forward.

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

First, it is opened at station F as shown in Figure 18,
A pair of open/close molds 8, 8' from which each molded product 2' has been taken out by the molded product take-out device 80 rotates to station A. Therefore, when the AC servo motor 64 is stopped and the pair of opening/closing molds 8.8' are stopped at station A, the pair of opening/closing molds 88' are used for each molten parison that has already been extruded to a predetermined length. 2.2.2 is clamped by the mold clamping device 100. That is, the mold clamping device 1
The roller 124 of the second link 123 of 00 is pressed downward by the hydraulic cylinder 114, and the connecting plate 112 is moved to the base plate 9.
The top is moved outward (radially outward of the turntable 7) (forward movement).

Due to this forward movement of the connecting plate 112, one clamp rod 104 pushes one of the molds 8 in the closing direction, and the other clamp rod 104' pushes the slide rod 110. Intermediate link 111. Swing lever 105, intermediate link 108
is moved in the opposite direction to the one clamp rod 104 to push the other mold 8' in the closing direction. As a result, the pair of opening/closing molds 8.8' are instantly closed so as to sandwich the three molten parisons 2.2.2.

Almost simultaneously with the clamping of the pair of opening/closing molds 8, 8', the rod 42a of the air cylinder 42 of the parison cutting device 40 moves back and forth, causing the cutter 48 to rotate at high speed in one direction (clockwise) of the arrow in FIG. , the above three melted parisons 2. 2
．． 2 are instantly cut off. The cutter 48 is rotated in one direction by the one-way clutch 46 to cut each molten parison 2°2.2, so that each molten parison 2
, 2°2 can be cut in a constant state, for example, to always have the same constant length. This allows each melted parison 2. 2. 2. Phyto-back control can be easily performed by monitoring the cutting length and processing the data.

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 22.2 to the same constant length is promoted.

At approximately the same time as each of the molten parisons 2.2.2 is cut, the extruder body 13 of the extruder 10 on the side of the extruder head 19 moves a pair of hinges 31, 31 by the vertical drive mechanism 30, as shown in FIG. It rotates upward as a center and rises. As a result, when the pair of open/close molds 8,8' rotate to the next station B, each molten parison 2.8' being extruded from the pair of open/close molds 8,8' and the die head 19. 2.
2 will not interfere with each other. A pair of opening/closing molds 8.8'
When the molten parisons 2 and 2.2 are rotated to a position where they do not interfere with each other, the die head 19 side of the extruder main body 13 of the extruder 10 is centered around the pair of hinges 31, 31, as shown in FIG. As the rod 38a of the hydraulic cylinder 38 of the vertical drive mechanism 30 moves downward, it rotates downward and descends, and when the next pair of opening/closing molds 8.8' stay at station A, each molten parison 2.2.2 3 from the Goo head 19 so that it is pushed out to a predetermined length.
Continue to extrude the molten parison of the book 2,2.2 continuously.

Next, by driving the AC servo motor 64 and repeating the intermittent rotation and stopping every 60'' from station B to station E with the pair of opening/closing molds 8 and 8' closed, the above-mentioned A pair of opening/closing molds 8.8'
Compressed air is blown into each of the above-mentioned molten parisons 2 held between a pair of open/close molds 8.8' by a blow needle (not shown) built into the molten parison, and the parisons 2 are blow-molded into a predetermined shape. The molded product 2' is cooled in a pair of open/close molds 8, 8'.

In this pair of opening/closing molds 8, 8', the compressed air blowing device is not a blow pin but a blow needle.
It is not possible to take out the molded product 2' using the blow bin. Therefore, at the station B, the upper ends 2a, 2a, 2a of each molten parison 2, 2.degree. The clampers 76 and 76 respectively clamp each melted parison 2. 2. 2 upper end 2a
.

2a, 2a are corrected to a flat, upright state, so that the molded product 2' can be easily taken out from the pair of opening/closing molds 8° 8' by a molded product taking-out device 80, which will be described later.

In addition, each section from station A to station F has a large diameter (for example, 2700 mm) and a high weight (about 1.5 mm).
The turntable 7 of
．． A drive gear 66, a pair of idle gears 62, 62. A turntable drive device consisting of a driven gear 61 etc. rotates intermittently at high speed (for example, 2.5 seconds) (for example, 6 seconds).
0'' section in 1.6 seconds and then stopped for 0.9 seconds), the pair of opening/closing molds 8 and 8' are sequentially and intermittently rotated. A pair of idle gears 62.6 is provided between the annular driven gear 61 and the drive gear 66 that transmits the rotation of the AC servo motor 64.
2, it is possible to eliminate backlash between each gear. Thereby, the rotation of the turntable 7 and the positioning when stopped can be performed with higher precision.

When the pair of opening and closing molds 8 and 8' come to station F, the pair of chucks 85 and 86 of the upper burr gripping and extraction mechanism 81 of the molded product extraction device 80 have already been lowered, so that the pair of opening and closing molds 8 and 8' have already been lowered. 8. The upper burr 2a' of the molded product 2', which protrudes from the upper surface of 8' and has been corrected to a flattened state by the burr shape correction mechanism 70, is gripped by each chuck piece 89 of the chuck 85 and the chuck 86. At approximately the same time as this gripping, the mold clamping device 100 is operated by the hydraulic cylinder 115 to open the pair of opening/closing molds 8, 8'. Then, when the rod 82a of the air cylinder 82 of the upper burr gripping and extraction mechanism 81 is moved out, the pair of chucks 85 and 86 are raised to the suction gripping and conveying mechanism 90. When the molded product 2' is lifted up by the upper burr gripping and taking-out mechanism 81, as shown in FIG. The molded product 2' can be reliably vacuum-adsorbed directly below the pair of chucks 85, 86 of the upper part 2a/ of the product 2', and the body 2b' can be swung by each pair of gripping pieces 97,97. Hold it securely. Next, the arm 91 is rotated 180' by the motor 92 to release the suction and gripping state, so that each of the finished molded products 2' is stored in the molded product storage container 68, respectively.

Opening of the pair of opening/closing molds 8° 8' by the mold clamping device 100 is performed by moving the connecting plate 112 in the opposite direction to the mold clamping (backward movement).

The pivot shaft 107 of the swing lever 105 of this mold clamping device 100 is located below the height of the pair of guide shafts 101.
The distance to the pin pivot point of the intermediate link 108 at the other end;
Intermediate link 11 of slide rod 110 from pivot 107
Since the distance to the pin pivot point 1 is made equal, and the pivot shaft 107 is provided between the position of the pair of guide shafts 101 and the top surface of the base plate 9, the mold clamping force of the mold clamping device lOO is reduced. can be equally divided between the pair of guide shafts 101, 101 and the base plate 9, and no unreasonable load is applied to the plywood 9 or the like. Further, the opened and closed states of the pair of opening/closing molds 8.8' can be reliably maintained by the toggle mechanism 120, which has a simple structure and includes a first link 121, a second link 123, and the like.

In addition, when the screw 16 of the extruder 10 is taken out for cleaning after the blow molding is completed by the rotary blow molding machine 1, the extruder 10 is placed against the tartable 7 as shown by the two-dot chain line in FIG. The extruder main body 13 can be rotated by a predetermined angle by a rotation drive mechanism 20. Thereby, the extruder main body 13 does not interfere with the mold clamping device 100, etc., and cleaning of the screw 16 etc. can be facilitated. Further, since the extruder main body 13 is of a rotating type, the installation space of the rotary blow molding machine 1 can be saved.

According to the embodiment, the extruder 10 of the rotary blow molding machine 1 is moved by the pair of hinges 31 and 3 by the vertical drive mechanism 30.
Although the extruder 10 is configured to be movable up and down centering on the extruder 10, the extruder 10 is not limited to this, and an extruder 10 of another embodiment shown in FIG.
', the position of the pair of hinges 31' and 3F is adjusted between the height of the guide head 19 and the path through the inverted V-shaped frame 3.
It may be set at the same height (on the same horizontal plane). This makes it possible to reliably solve problems such as vibration of the gouging head 19 and misalignment of the parison 2. Note that other configurations are the same as those in the previous embodiment, so the same reference numerals are given and detailed explanations are omitted.

〔Effect of the invention〕

As described above, according to the present invention, in the blow molding machine, the paris shape correction mechanism is disposed above the mold, so that the upper end of the parison that protrudes above the upper surface of the mold before solidification is adjusted to the paris shape. It can be corrected to a flat standing state by the correction mechanism.

[Brief explanation of the drawing]

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. 4 is a rear view of the same extruder,
Figure 5 is a plan view of the parison cutting device of the same blow molding machine;
Fig. 6 is a sectional view taken along the line ■■ in Fig. 5, Fig. 7 is a side view showing a part of the parison cutting device in cross section, Fig. 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 same blow molding machine, Fig. 10 is a plan view of the burr shape correction mechanism of the same blow molding machine, Fig. 11 is a side view of the molded product ejecting device of the same blow molding machine, and Fig. 12 13 is a sectional view taken along the xm-xm line in FIG. 12, and FIG. 14 is a front view of the burr gripping and extraction mechanism of the molded product extraction device of the same blow molding machine. Fig. 15 is a plan view of the suction gripping and transporting mechanism of the molded product take-out device, Fig. 16 is a side view of the suction gripping and transporting mechanism, Fig. 17 is a front view of the suction gripping and transporting mechanism, and Fig. 18 is the blower. FIG. 19 is an enlarged side view of the mold clamping device of the molding machine, and FIG. 19 is a side view of the extruder of another embodiment. 1- (rotary) blow molding machine, 2... (molten) parison, 2'... molded product, 2a'... upper burr, 8, 8'
(A pair of opening/closing) molds, IO...extruder, 48...cutter, 70...paris shape correction mechanism. Figure 3 T'''''' - [ Figure 4 Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] (1) A mold that holds the parison is disposed below an extruder that extrudes the parison, and the parison is cut with a cutter at a position above the upper surface of the mold.
A blow molding machine that forms an upper burr on the upper part of a molded product is characterized in that a burr shape correction mechanism is disposed above the mold to correct the upper end of the parison before solidification into a flattened state. blow molding machine.