JPH0497827A - Blow molding machine - Google Patents

Abstract

PURPOSE:To enable revision in a flat and raised state and easy taking-out without an error, by a method wherein a deburring mechanism and molded product taking-out device are arranged on the upper part of a mold. CONSTITUTION:A molded product holding apparatus 68 holding a taken out molded product and a chute 69 are provided in a raised state at a position of a station F of a turntable 7 on a base 5. Then a deburring mechanism 70 revising the upper end of molten parison 2 before solidification projected upward of the top of a pair of an opening and closing molds 8, 8' is arranged on a position of a station B of the turntable 7 of a portal frame 7. Then a molded product taking-out device 80 taking out an upper parison 2a' of the molded product 2' while sucking the upper parison 2a' and holding a barrel part 2b' after raising the upper parison 2a' of the molded product 2' by holding them at the time of breaking of the above-mentioned pair of the opening and closing molds 8, 8' after blow molding is provided between an upper frame 68a and intermediate frame 68b projected upward of the turntable 7 of the molded product holding apparatus 68.

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, JP-A-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 toward the upper surface of the pair of closed 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 to solve 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, thereby providing an upper Parison at the top of the molded product. In a blow molding machine that performs molding, a parison shape correction mechanism is disposed above the mold to correct the upper end of the parison before solidification to a flattened state, and also holds the upper parison after blow molding. Accordingly, a molded product ejecting device is provided to take out the molded product from the mold.

[Effect]

The upper end of the parison, which protrudes above the upper surface of the mold, is corrected to a flattened state by the parison shape correction mechanism before solidification, and is easily removed without mistakes by the molded product removal device.

〔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 88' are used to sandwich and blow mold the molten parison 2 on a turntable 7 rotatably supported on a base 5 attached to the base 5 via a support shaft 6 (see FIG. 8). Six sets of molds 8 and 8' are mounted on each base plate 9, and each pair of opening/closing molds 8, 8' in each of the six sets rotates intermittently over the section from station A to station F shown in FIG. By sequentially turning the melted parison 2
For example, molded products 2' (
(See Fig. 11) can be continuously blow molded.

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 88' when descending. There is.

As shown in FIGS. 1 to 4, this extruder main body 13 has a hopper 14 on its upper rear side into which a pellet-shaped thermoplastic resin (raw material) is introduced, and a lower part of this hopper 14 has a 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 within this cylinder 18 is formed into three tubular molten parisons 2.2.2 by a tubular push-in die head 19 provided at the tip of the cylinder 18, which is formed into 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 and 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, the parison cutting device 40, as shown in FIG. ．． 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 rotates in one direction without reciprocating, thereby allowing each melted parison 2. 2. 2
Since the upper ends 2a, 2a, 2a of each molten parison 2, 2.2 are not cut, each molten parison 2, 2.2 can be cut in a constant state, for example, in a constant length. Note that the upper end 2a of each molten parison 2 is a molded product 2' after blow molding.
An upper burr 2a' (a burr at the mouth) is left on the upper part of the holder.

As shown in FIGS. 5 and 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 52.52 are swingably supported on the recess 41a of the base plate 41, and both ends are connected to the pair of links 52.52.
52 and the tip 51 of the rod of the air cylinder 51
an intermediate link 54 which is pivotally supported by a pin on each of the intermediate links 54 and the tips of the pair of links 52 and 52, and is rotatably supported via a support shaft 56, and an arc-shaped It is comprised of a roller 55 that comes into contact with the notch 44b and can freely move away from it 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 which are rotatably supported via respective support shafts 63 erected on the base 5 -h. 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. A pair of idle gears 6 are provided between this drive gear 66 and the driven gear 61 on the outer periphery of the turntable 7.
2 and 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 the 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, a pair of opening/closing molds 8.8' is provided with a parison for correcting the upper end 2a of the molten parison 2 before solidification into a flattened state, protruding above the upper surface. A shape modification mechanism 70 is provided. Moreover, between the upper frame 68a and the middle frame 68b that protrude above the turntable 7 of the molded product storage device 68, when the pair of opening/closing molds 8, 8' are opened after the hollow molding, the molded product 2' After gripping and raising the upper bar 1J2a', a molded product take-out device 80 is provided which sucks the upper burr 2a' of the molded product 2' and takes it out while gripping the body 2b'.

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 penetrates and slides a pair of guide shafts 75.75 that are passed over both sides 74a and 74H of this mounting plate 74, and solidifies to protrude above the upper surface of a pair of opening/closing molds 8.8'. the upper end 2a, 2a, of each previous melted parison 2.2.2;
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 68a 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 taking-out mechanism 81 that grips and raises the upper burr 2a' of each molded product 2', and an upper burr gripping and taking-out 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 taking-out mechanism 81. a suction gripping and conveying mechanism 90 that sucks the upper burr 2a' of each incoming molded product 2', grips its body 2b' and rotates 1000 times to store 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 same-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 burr 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 the rods 87a, 88 of each of the air cylinders 87, 88
Due to the movement of a, the three chuck pieces 89 of one chuck 85 and the other chuck 86 move the upper part 2 of the molded product 2'.
Holding the upper end of the molded product 2', the rod 82a of the air cylinder 82 is moved to remove the molded product 2' from the pair of opening/closing molds 8.8. It is designed to be raised to a predetermined position.

As shown in FIGS. 11.15 to 17, the suction gripping and conveying mechanism 90 includes a pair of arms 91.91 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. A slide frame 94 is provided on both sides of the front end of each arm 91 so as to be slidable in the front and back direction along a pair of guide shafts 93 and 93, and 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, and an air cylinder 95 that is attached to the upper front surface of the slide frame 94 at an equal distance apart, and vacuums the upper burr 28' of the molded product 2'. Three suction pads 96 for suction, and three sets of air cylinders 98 that are attached at equal distances apart from each other on the lower front side of the slide frame 94 and that grip and release the grip on the body 2b' of the molded product 2'. It is composed of a pair of gripping pieces 97, 97. still,
Reference number 99 in FIG. 11 is a proximity switch, and each proximity switch 99 opens 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 91.91. A pair of opening/closing molds 8.8'
The rotational positions of the pair of arms 91 and 91 are determined so that they are located above the chute 69 of the molded product storage container 68, respectively.

60° on the turntable 7 through six base plates 9
Each of the six sets 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 10 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 through
A pair of movable plates 10 which are slidably provided at 1° 101 and have each of the molds 8 and 8' fixed to opposing surfaces, respectively.
3, 103', and a pair of clamp rods 104, 104', one end of which is fixed to the back side of each movable plate 103, 103', and which brings the molds 8, 8' into contact with and separates from each other.
Bracket 106 erected at one end (outside) of the base plate 9
is swingably supported via a pivot shaft 107 located below the height of each guide shaft 101.
A rocking lever 105 is pivotally supported via a swing lever 105 and has a lower end projecting downward from the upper surface of the base plate 9 through an opening 9a, and a pair of blocks 109 below the base plate 9.
an intermediate link 1 which is slidably supported via an intermediate link 109 and whose one end is pivoted to 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 at a lower end equidistant from the other end of 08 and the pivot shaft 107, and each of the slide rod 110 and the other clamp rod 104 is inserted 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 6.
A pair of hydraulic cylinders (actuators) 114 and 115 suspended at positions corresponding to stations A and F of No. 7 make the connecting plate 112 reciprocally movable. Then, the pair of opening/closing molds 8, 8' are closed, and the connecting plate 112 is moved back by the other hydraulic cylinder 115 to open the pair of opening/closing molds 8° 8' and maintain their state. It is composed of a toggle mechanism 120.

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.
A first link 121 whose other end springs upward when pressed by 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 8, 8' are replaced with each other that has already been extruded to a predetermined length. It is closed by the mold clamping device 100 so as to clamp the molten parison 2.2.2. That is, the roller 124 of the second link 123 of the mold clamping device 100 is pressed downward by the hydraulic cylinder 114, and the connecting plate 112 moves outward (radially outward of the turntable 7) on the base plate 9 ( go).

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 cutter 46 to cut each molten parison 2.2, so that each molten parison 2, 2.2 is kept in a constant state, for example, always at the same constant length. Can be cut. This makes it easy to monitor the cutting length of each molten parison 2, 2.2 and to perform phytback control by 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 2.2. Ru.

Almost simultaneously with the cutting of each molten parison 2, 2.2, the die head 19 side of the extruder main body 13 of the extruder 10 moves a pair of hinges 31, 31 by a vertical drive mechanism 30, as shown in FIG. It rotates upward as a center and rises. As a result, when the pair of opening/closing molds 8,8' rotate to the next station B, each molten parison 2. 2
．． 2 will not interfere with each other. A pair of opening/closing molds 8, 8
' and each melted parison during extrusion2. 2. When the extruder body 1 of the extruder 10 rotates to a position where it does not interfere with the
As shown in FIG. 2, the die head 19 side of No. 3 rotates downward around the pair of hinges 31 and 31 due to the withdrawal of the rod 38a of the hydraulic cylinder 38 of the vertical drive mechanism 30, and the die head 19 side of No. When the opening/closing mold 8.8' is stationary at station A, each melted parison 2. 2.
The three molten parisons 2.2.2 are continuously extruded from the die head 19 so that the parisons 2.2.2 are extruded to a predetermined length.

Next, by driving the AC servo motor 64 and repeating intermittent rotation and stopping from station B to station E every 606 times with the pair of open/close molds 8.8' closed, the pair of opening/closing molds 8.8' Opening/closing mold 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 bin 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 upper end 2a of each melted parison 2, 2.2 is clamped by a clamper 76, 76, respectively.

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 (approximately 10 mm).
The turntable 7 has an ACt-bo motor 64.
A drive gear 66, a pair of idle gears 62.62. High speed (
For example, 2.5 seconds) and intermittent rotation (for example, 60 seconds).
The pair of opening/closing molds 8.8' are sequentially rotated intermittently. A pair of idle gears 62, 62 are provided between the driven gear 61 and the drive gear 66 that transmits the rotation of the AC servo motor 64.
, 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 8.8' come to station F, the pair of chucks 85 and 86 of the upper burr gripping and extraction mechanism 81 of the molded product takeout device 80 have already been lowered, so the pair of opening and closing molds 8.8' The molded product 2' protrudes from the upper surface of the molds 8, 8' and is corrected into a flattened state by the Paris shape correction mechanism 70.
The upper burr 2a7 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, by retracting the rod 82a of the air cylinder 82 of the upper burr gripping and extraction mechanism 81, the pair of chucks 85 and 86 are raised to the suction gripping and transporting mechanism 90. When the molded product 2' has been lifted up by the upper burr gripping and taking-out mechanism 81, one arm 9 of the suction gripping and conveying mechanism 90 is moved as shown in FIG.
1, each suction pad 96 provided on the molded article 2' reliably vacuums the upper part 2a/ of the pair of chucks 85, 86 directly below 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 180'' by the motor 92 to release the suction and gripping state, and each of the completed 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, 101, and from this pivot shaft 107, the clamp rod 104'
The distance to the bin 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 100 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. Furthermore, 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 tar table 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. This prevents the extruder main body 13 from interfering with the mold clamping device 100 and the like, making cleaning of the screw 16 and the like easier. 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 connected to the pair of hinges 31.3 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', 31' is reversed V.
The height of the die head 19 may be set to the height of the die head (on the same horizontal plane) via the letter-shaped frame 3. 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 parison shape correction mechanism and the molded product ejection device are disposed above the mold, so that the parison before solidification protrudes above the upper surface of the mold. The upper end can be corrected to a flattened state by the above-mentioned Paris shape correction mechanism, and the molded product can be easily taken out without mistakes by the above-mentioned molded product take-out device.

[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;
Figure 6 is a sectional view taken along the line ■-■ in Figure 5, Figure 7 is a side view showing a part of the parison cutting device in cross section, and Figure 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. The figure is a side view of the upper burr gripping and extraction mechanism of the molded product extraction device of the blow molding machine, Figure 13 is a sectional view taken along the line XIII-xm in Figure 12, and Figure 14 is a front view of the upper burr gripping and extraction mechanism 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 same. FIG. 19 is an enlarged side view of a mold clamping device of a blow molding machine, and FIG. 19 is a side view of an 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, 10... Extruder, 4
8...Cutter, 70...Paris shape correction mechanism, 80
... Molded product removal device. Figure 3 r--[ Figure 4 Figure 12 Figure 13

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.
In a blow molding machine that forms an upper burr on the upper part of a molded product, a burr shape correction mechanism is disposed above the mold to correct the upper end of the parison before solidification into a flattened state, and the blow molding machine A blow molding machine characterized by being provided with a molded product take-out device that takes out the molded product from the mold by holding the upper burr after molding.