JP5415056B2 - Hollow molding equipment - Google Patents

Description

  The present invention relates to a hollow molding apparatus capable of easily and reliably recovering an upper flash which is a resin surplus portion of a mouth portion generated when a hollow molded product made of a synthetic resin is blow-molded.

  In the conventional hollow molding apparatus, compressed air is blown into a parison extruded from the head of an extruder through a driving nozzle and expanded in a closed molding die, and a blow molded hollow article is blown. A transport mechanism.

  The occurrence of top flash in such hollow molding is because the upper part of the parison introduced into the molding die protrudes slightly upward from the molding die and is cut by a cutter. This is due to the fact that it remains as an upper beam when it is lowered into the parison.

  When the driving nozzle is driven into the parison, the upper beam is sandwiched between the die of the molding die and the cutting sleeve located at the upper portion of the driving nozzle and is sheared and cut.

  Conventionally, the cut top beam is collected while the grip holder attached to the pair of platens to which the molding dies are attached holds the hollow molded product attached to the driving nozzle together with the top beam. According to the upward movement of the nozzle, the flash was attached to the driving nozzle and separated from the hollow molded product.

  The detached upper beam is brought into contact with the dropping plate located above the nozzle by further raising movement of the driving nozzle, and is removed from the driving nozzle and dropped into the space portion. The blown-out air blows out into a shooter that opens in a wide mouth shape and collects it.

  The holding holder is driven in accordance with the movement of the platen that is interlocked with the opening / closing of the molding die, the opening / closing of the clamping device, and the driving of the clamping.

  Such recovery of the top beam is effective in a narrow work area, but usually there is an open space part with a height of 4 cm to 8 cm up to the drop plate. There is a possibility that the upper flash cannot be reliably recovered because it may not be blown well inward or may be scattered around the hollow molding apparatus.

  Therefore, for example, as shown in FIG. 13, the improved technique described in Patent Document 1 leaves the cut upper beam 113 in the driving nozzle 102 and lifts it together with the driving nozzle 102, so that the housing 104 with the duct 143 is moved. Passing through the nozzle insertion bottom hole 142 drilled in the bottom plate, the upper beam 113 is in contact with the inner peripheral edge of the upper hole 141 narrowed in the nozzle insertion diameter drilled in the top plate of the housing 104. Then, the upper beam 113 is removed from the driving nozzle 102.

  Then, the bottom hole 142 for inserting the nozzle is dropped into the housing 104 closed by the shutter 105, and is discharged from the duct 143 to the outside of the housing 104 by air to collect the top beam 113.

In FIG. 13, reference numeral 111 denotes a product after molding, and reference numeral 123 denotes a shaft that suspends the housing 104. The shaft 123 is fixed to a nozzle driving body (not shown).
JP 2003-53827 A

  The above-described top beam recovery method has a problem that a predetermined occupied space for the housing 104 and the duct 143 is required in the molding apparatus itself in the mold clamping and driving process. Further, these large-scale structural products for collecting the top beam are required, which increases the cost and complicates the control of these structural products. Further, there is a risk that the shutter 105 may sandwich the flash.

  The present invention is intended to solve the technical problems of such a conventional hollow molding apparatus, and can be applied to a hollow molding apparatus having a narrow work area in the mold clamping and driving process, and has a simple configuration. The purpose is to reliably collect the top beam by the top beam recovery mechanism.

The present invention, in order to achieve the above object, the invention according to claim 1, the mold clamping device a pair of platen hammering device for performing blow molding of the pair of split molds that constitute the molding die was attached each A pair of support members are provided on the sides, and at least a pair of grip bodies are provided on the pair of support members, and the at least one pair of grip bodies is opened and closed independently of opening and closing of the mold and driving of the mold clamping. A product holder provided with a drive cylinder for driving ;
At least a pair of split bodies is provided on one of the pair of support members at a position above the molded product gripped between the at least one pair of grip bodies, and the at least one pair of split bodies is driven to open and close A cylinder is provided, and when the at least one pair of indexing bodies is opened, a driving nozzle with a top beam of the driving device is passed through and receives an upper beam separated by the at least one pair of indexing bodies when closed. An upper beam receiver,
Be provided at least one pair of split receiving body said one of the support member upwardly of said upper beams receiving unit, when the hammering nozzles after blow molding is increased, the upper beams attached to ball striking write nozzle A stopper body that abuts and drops onto the upper beam receiving portion;
A hollow molding apparatus characterized by comprising:

The invention according to claim 2, wherein at least one pair of split receiving body is driven to open and close by the split receiving body of the drive cylinder independently of the opening and closing of said at least one pair of gripper of the product holder This is a hollow molding apparatus.

  The operation of the invention according to claim 1 is as follows. That is, after blow molding, the product after molding is gripped by the pair of gripping bodies of the product holder by a drive system independent of the opening and closing of the mold clamping device and the mold clamping drive system, and then the pair of indexing bodies of the upper beam receiving part is opened. In this state, the driving nozzle is raised and the upper beam attached to the tip of the driving nozzle is brought into contact with the upper stopper body according to the driving nozzle rising and dropped, and the upper beam receiving portion of the closed indexing body pair is closed. It will be received and contained and excluded.

  Therefore, in the present invention, the product holder is driven by a drive system independent of the opening / closing of the mold clamping device and the mold clamping drive system. Therefore, after the independently driven product holder holds the molded product, the mold is Even during closed blow molding, it can be taken out of the molding apparatus.

  Therefore, the molded product is not located below the upper beam receiving body that contains the upper beam, the upper beam receiving body can be opened and the upper beam can be dropped as it is, and the conventional scattering can be eliminated. it can. Further, the present invention can be applied to a hollow molding apparatus having a narrow work area in the mold clamping / blowing process, and has an effect of ensuring the recovery of the top beam by the top beam recovery mechanism having a simple configuration.

  The effect of the invention according to claim 2 is that the drive system of the upper beam receiving portion is made independent of the drive system of the product holder, so that the degree of freedom can be given by these drive operability.

  As described above, the hollow molding apparatus of the present invention can hold the product after molding the top beam with the product holder, drop it with the stopper body, and receive and receive it in the receiving part of the gripping body. Compared to the conventional product holder with a drive system linked to the opening and closing and mold clamping drive system, it is possible to eliminate scattering of the upper beam, and it can also be applied to hollow molding equipment with a narrow work area in the mold clamping and blowing process Therefore, it is possible to reliably recover the top beam.

  As shown in FIGS. 1 and 2, a hollow molding apparatus according to an embodiment of the present invention includes an extruder 1 that melts and extrudes a resin composition as an operation unit for molding, and a tip of the extruder 1 There is a crosshead 2 for pushing out the parison, a parison cutting device not shown below, a molding die 3, a driving device 4, a clamping device 5, a molding die moving device 6 and a molded product. And a take-out device 7.

  The extruder 1 includes a hopper 8 for charging a resin composition, and a screw (not shown) for transferring, kneading, melting, and discharging the resin composition inside the extruder. The crosshead 2 is for two heads, and consists of a die and a core. The resin composition melted in the extruder 1 is supplied to the head 2 through the extruder so that a cylindrical parison is formed.

  The parison cutting device (not shown) cuts the upper end portion of the cylindrical parison hanging from the cross head 2 and includes a cutter holder having an electric heating cutter.

  As shown in FIGS. 2 and 3, the molding die 3 is composed of a pair of split molds 3a and 3b, and these split molds insert a cylindrical parison to form a hollow molded product P. The cavity is formed. A pair of caps 3c and 3d having an upward taper for biting the top beam of the parison are provided at the pair of improving edges of the cavities of the split molds 3a and 3b.

  Further, the molding die 3 is moved by a molding die moving device 6 having an accompanying die moving electric motor 6 a, at a position directly below the two-head crosshead 2 and the left and right blowing nozzles 9, 9 of the driving device 4. It can be reciprocated alternately in the horizontal direction between the positions immediately below.

  As shown in FIGS. 1 and 2, the driving device 4 includes right and left driving nozzles 9 and 9 which are inserted into a parison and blow compressed air above the left and right cavities of the molding die 3, respectively. A driving nozzle driving device 10 for raising and lowering the nozzle is provided. The driving nozzle driving device 10 includes a variable speed type blowing device driving motor connected to a control unit (not shown). As shown in FIG. 3, a cutting sleeve for shearing and cutting the top of the parison in cooperation with the caps 3c and 3d of the split molds 3a and 3b is provided on the upper portion near the tip of the driving nozzles 9 and 9. 9a is formed.

  As shown in FIG. 2, the mold clamping device 5 drives the molds 3a and 3b of the molding die 3 so as to open and close and mold-clamp. The front platen 11 and the rear platen 12 attached thereto are moved in synchronization with the parting line PL of the molding die 3 in the approaching / separating direction. 1 and 2, reference numeral 13 denotes a front platen support plate to which the front platen 11 is attached.

  As shown in FIGS. 4 and 5, the product holder 20 that holds the two products P after the molding is extended in a direction orthogonal to the opening / closing direction of the molding die 3. The product holder 20 is driven separately from the drive system of the mold clamping device 5, and includes a pair of front and rear support members 21 and 22 attached to the front platen 11 and the rear platen 12, and drive attached to each of them. Cylinders 23, 24, left and right front body gripping members 27, 27 and left and right rear body gripping members 28, 28 attached to left and right push-out members 25, 26 moved forward and backward by these drive cylinders, and left and right fronts The mouth holding members 29 and 29 and the rear mouth holding members 30 and 30 are provided.

  The product holder 20 is configured to hold the product P which is released from the split molds 3a and 3b separated from each other and suspended from the left and right driving nozzles 9 and 9 after the blow molding is completed. The take-out slide unit 7a of the molded product take-out device 7 is inserted into the product holder 20 during mold opening, and holds the hollow molded product P. After the holding bodies 27, 28, 29, and 30 of the left and right product holders 20 and 20 are separated, the hollow molded product P is held and conveyed outside the molding apparatus.

  The front support member 21 has a front support plate 21a bolted to the side surface of the front platen 11, and is bolted to the front support plate 21a and extends in a direction orthogonal to the front support plate 21a to bolt the front drive cylinder 23. A front cylinder support plate 21b.

  The rear support member 22 has the same structure as that of the front support member 21, and a rear support plate 22a bolted to the side surface of the rear platen 12, and a bolt fixed to the rear support plate 22a and orthogonal to the rear support plate 22a. And a rear cylinder support plate 22b to which the rear drive cylinder 24 is fixed with bolts.

  The plate-like front pushing member 25 is bolted by a mounting plate 23 b at the tip of a pair of cylinder shafts 23 a of the front drive cylinder 23. The front pushing member 25 is formed with vertically elongated holes 25a and 25b on the left and right sides so that the left and right screw shafts 27a and 27b of the front body gripping member 27 can freely slide in the vertically elongated holes 25a and 25b in the longitudinal direction and in the axial direction. It is fixed with a nut so that the position can be adjusted.

  As in the case of the front push member 25, the plate-like rear push member 26 is also bolted by a mounting plate 24b at the tip of a pair of cylinder shafts 24a of the rear drive cylinder 24, as shown in FIGS. The rear pushing member 26 is formed with vertically elongated holes 26a and 26b on the left and right sides, and is fastened with nuts so that the left and right screw shafts 28a and 28b of the rear body gripping member 28 can freely slide in the vertically elongated holes 26a and 26b in the longitudinal direction. Yes.

  As shown in FIGS. 5 to 7, the front body gripping member 27 and the rear body gripping member 28 are made of rubber that does not deform the hollow molded product P at an equidistant position with the parting line PL sandwiched between the front ends thereof. Belts 27c and 28c are provided, and the body of the hollow molded product P after hollow molding can be gripped by these belts.

  The front pushing member 25 is formed with second vertically long holes 25c and 25d on both outer sides of the vertically long holes 25a and 25b, and the side face L-shaped front mouth gripping member 29 is fixed to the vertically long holes 25c and 25b by left and right bolts 29a and 29b. Bolts are fixed to 25d so that they can slide freely in the vertical direction.

  Similarly to the front push member 25, the rear push member 26 is also formed with second vertically long holes 26c and 26d on both outer sides of the vertically long holes 26a and 26b as shown in FIGS. The rear opening gripping member 30 of the mold is bolted by the left and right bolts 30a, 30b so as to be freely slidable in the vertical holes 26c, 26d in the vertical direction.

  As shown in FIGS. 5, 6, and 8, the front-portion gripping member 29 and the rear-portion gripping member 30 do not deform the hollow molded product P at equidistant positions across the parting line PL. Semi-ring type elastic supports 29c, 29d, 30c, and 30d made of synthetic resin such as nylon and Teflon (registered trademark) are provided so as to support the mouth of the hollow molded product P after hollow molding. It can be received and elastically supported. These elastic supports are respectively bolted to the slide plates 29e and 30e. The left and right bolts 29h, 29i and 30h are inserted into the long holes 29f, 29g, 30f and 30g formed by the slide plates 29e and 30e at both ends in the longitudinal direction. , 30i are bolted so as to slide freely in the advancing and retracting direction with respect to the parting line.

  As shown in FIGS. 4, 5, and 9, the left and right upper beam receiving portions 40, 41 are attached to the front support plate 21a of the front support member 21 with a bracket 21d via a spacer 21c, and left and right attached to the bracket 21d. Are attached to the drive cylinders 42 and 43 so as to overhang the parting line PL above the front mouth grip bodies 29 and 30.

  The upper beam receiving portions 40 and 41 receive the upper beams that have fallen in contact with the left and right stopper bodies 50 and 51 provided above the hollow beam receiving portions 40 and 41, respectively, and are hollow molded as shown by the two-dot chain line in FIG. A pair of indexing bodies 40a, 40b and 41a, 41b on which the top burr B1 of the product P can be placed respectively are provided. These split bodies are provided with tip portions 40c, 40d and 41c, 41d that are tapered upwardly and have a notch shape.

  The pair of split bodies 40a, 40b and 41a, 41b are opened and closed by the drive cylinders 42, 43 in the direction in which the parting line PL extends in FIG. 9, in other words, in the direction perpendicular to the opening / closing direction of the molding die 3. It is designed to be driven.

  As shown in FIGS. 4, 5 and 10, the left and right stopper bodies 50 and 51 for contact / dropping of the upper beam are provided above the indexing bodies 40a and 40b and 41a and 41b of the upper beam receiving portions 40 and 41, respectively. It has a plate shape protruding to the top and is attached to the upper surfaces of the drive cylinders 42 and 43 in a cantilever manner.

  The tip portions 50a, 51a of the left and right stopper bodies 50, 51 are notched in a horseshoe shape, and the upper beam B1 that has been lifted by adhering to the driving nozzle 9 is brought into contact with the upper beam B1. The bodies 40a, 40b and 41a, 41b are adapted to drop onto the notch taper tips 40c, 40d and 41c, 41d. The distance from the upper surface of the distal ends of the left and right split bodies 40a, 40b and 41a, 41b to the lower surface of the distal ends of the left and right stopper bodies 50, 51 is preferably 5 mm to 20 mm.

  Below the product holder 20, there are a front cutter 60 and a rear cutter 61 for cutting the lower beam formed on the bottom of the hollow molded product P, and receiving portions 70 and 71 for holding the lower part of the hollow molded product P when the lower beam is cut. Is provided.

  That is, the support bracket 72 is bolted to the longitudinal elongated holes 25c and 25d in the longitudinal elongated holes 25c and 25d by the left and right bolts 73 and 74 so as to freely slide in the longitudinal direction.

  The flat U-shaped front cutter 60 is formed with elongated holes 60a and 60b on both sides in the longitudinal direction at the overlapping part with the support bracket 72, and these can be moved forward and backward with respect to the parting line PL by bolts 75A and 75B. It is bolted so that it can slide freely.

  The front cutter 60 is bolted to the projecting cutter parts 60c and 60d with two elongated holes 60e and 60f, and the upright receiving parts 70 and 71 are parted in the elongated holes 60e and 60f. It can be freely slid freely with respect to the line PL. The receiving portions 70 and 71 are preferably formed from rubber or synthetic resin so as to hold down the bottom corners of the hollow molded product P so that the hollow molded product P is not deformed.

  A second rear cylinder plate 22c is bolted to the rear support plate 22a, a drive cylinder 76 is attached to the second rear cylinder plate 22c, and a rear cutter 61 having an L-shaped cross section is attached to the cylinder shaft 76a via an attachment plate 77. It is attached. The rear cutter 61 is moved forward and backward with respect to the stationary front cutter 60 by the drive cylinder 76 to jointly cut the lower beam.

  Next, operation | movement of this hollow molding apparatus is demonstrated. In blow molding by such a hollow molding apparatus, as shown in FIGS. 1 and 2, first, a resin is dropped from the multi-head crosshead 2 to form left and right parisons in FIG. Insert into the left and right cavities. Next, the left and right blowing nozzles 9 and 9 corresponding to these parisons are driven, compressed air is blown into the parison, and the parisons are expanded until they coincide with the cavities of the molding die 3.

  By this blow molding, a bottle which is a hollow molded product P is molded as shown in FIG. The upper part of the parison is cut by a parison cutting device (not shown) when the molding die 3 is closed by the mold clamping device 5, and then the molding die 3 is driven by the molding die moving device 6. Then, the driving nozzles 9 and 9 are lowered, and the upper beam B1 is sheared by the caps 3c and 3d of the molding die 3 and the cutting sleeve 9a of the driving nozzle 9 introduced into the parison.

  The molding die 3 is moved to the original position in FIG. 1 by the molding die moving device 6 in the state after the mold is opened. When the mold is opened, the driving nozzle 9 attaches the upper beam B1 and suspends the hollow molded product P. The molding die returned to the original position is closed, and the next newly suspended parison is inserted into the cavity.

  At this time, as shown in FIG. 5, the front body gripping body 27 and the rear body gripping body 28 that are in the gripping position in advance hold the body parts of the two hollow molded products P and at the same time, the front mouth part gripping body. 29 and the rear mouth part gripping body 30 sandwich the mouth part of the hollow molded product P. At the same time, the lower portions of the two hollow molded articles P are pressed against the receiving portions 70 and 71, respectively.

  After gripping the hollow molded product P by the product holder 20, the drive cylinders 42 and 43 are operated to close the pair of indexing bodies 40 a and 40 b and 41 a and 41 b, and the driving nozzle 9 is raised to raise the upper beam receiving portion 40. , 41, the left and right upper beams B1 attached to the driving nozzle 9 and lifted together come into contact with the tip portions 50a, 51a of the stopper bodies 50, 51. The driving nozzle 9 rises as it is and returns to a predetermined position. When the left and right upper beams B1 come into contact with the stopper members 50 and 51, the tip portions 40c, 40d and 41c of the pair of indexing members 40a, 40b and 41a, 41b in a state where the upper beam receiving portions 40 and 41 are closed, It is dropped and accommodated in 41d.

  The mold 3 thus clamped is moved again below the driving device 4 by the mold moving device 6. After this movement, the rear cutter 61 advanced by the drive of the drive cylinder 76 cuts the lower flash of the hollow molded product P in cooperation with the front cutter 60 in the stationary position.

  Next, the take-out slide unit 7a of the molded product take-out device 7 grips the body of the hollow molded product P. Then, as the front pushing member 25 and the rear pushing member 26 driven by the drive cylinders 23 and 24 move away from the parting line PL, the front trunk gripping member 27, the rear trunk gripping member 28, and the front As shown in FIG. 12, the mouth grip member 29 and the rear mouth grip member 30 move to a retracted position that does not hinder the removal and transfer of the hollow molded product P by the removal slide unit 7a.

  As shown in FIG. 1, the take-out slide unit 7a moves backward out of the molding apparatus, and the hollow molded product P is taken out.

  After the hollow molded product P is taken out of the molding apparatus, the pair of indexing bodies 40a and 40b of the top beam receiving part 40 and the pair of paired indexing bodies of the top beam receiving part 41 are driven by driving cylinders 42 and 43. 41a and 41b are opened in a direction away from each other, and dropped and collected in an appropriate upper beam receiving portion below them.

  After the compressed air in the hollow molded product P blown and cooled in the molding die 3 is exhausted, the molding die 3 is opened by the mold clamping device 5. After the molding die 3 is opened, the molding die moving device 6 again moves to the original position in FIG. At this time, the drive cylinders 23 and 24 are operated to return to the closed state as shown in FIG. Thus, according to the present embodiment, it is possible to reliably remove the upper flash.

It is a front view of the hollow molding apparatus which shows embodiment of this invention. It is a side view of the hollow molding apparatus. It is sectional drawing which shows the arrangement | positioning relationship between the shaping die of the same hollow shaping | molding apparatus, and a driving nozzle. It is a front view which shows the product holder shown in FIG. 1, an upper beam receiving part, and a stopper body. It is a side view which shows the product holder, the top beam receiving part, stopper body, etc. which were shown in FIG. It is a front view which shows the product holder attached to the back platen. It is a top view which shows a pair of trunk | drum holding member of the product holder shown in FIG. It is a top view which shows a pair of opening part holding member of the product holder shown in FIG. It is a top view which shows the upper beam receiving part shown in FIG. It is a top view which shows the top beam receiving part and stopper body which were shown in FIG. FIG. 6 is a plan view showing a pair of bottom cutters of the product holder shown in FIG. 5. FIG. 6 is a side view showing a product holder, an upper beam receiving portion, a stopper body, and the like in a state different from FIG. 5. It is sectional drawing which shows the conventional top beam collection | recovery apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Mold Die 4 ... Punching device 5 ... Clamping device 9 ... Punching nozzle 20 ... Product holder 23, 24 ... Drive cylinder 27, 28 ... Body gripping member 29, 30 ... Mouth gripping member 40 , 41... Upper beam receiving portion 40 a, 40 b... Pair of indexing bodies 41 a, 41 b... Pair of indexing bodies 42, 43. Burr

Claims (2)

A pair of support members are provided on the side of the driving device for performing the blow molding of the pair of platens to which the pair of split molds constituting the molding die of the mold clamping device are respectively attached, and at least a pair of the support members are provided on the pair of support members. A product holder provided with a gripping body, and provided with a drive cylinder that opens and closes the at least one pair of gripping bodies independently of opening and closing of the molding die and driving of the mold clamping;
At least a pair of split bodies is provided on one of the pair of support members at a position above the molded product gripped between the at least one pair of grip bodies, and the at least one pair of split bodies is driven to open and close A cylinder is provided, and when the at least one pair of indexing bodies is opened, a driving nozzle with a top beam of the driving device is passed through and receives an upper beam separated by the at least one pair of indexing bodies when closed. An upper beam receiver,
Be provided at least one pair of split receiving body said one of the support member upwardly of said upper beams receiving unit, when the hammering nozzles after blow molding is increased, the upper beams attached to ball striking write nozzle by abutment, and a stopper member for dropping onto the upper burr receiving unit,
A hollow molding apparatus comprising: 2. The at least one pair of indexing bodies is driven to open and close by a drive cylinder of the indexing body independently of an opening / closing drive of the at least one pair of gripping bodies of the product holder. Hollow molding equipment.

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