JP4695788B2 - Method and apparatus for recovering top beam of hollow molded product - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for recovering a surplus portion of a synthetic resin in a hollow molded article and an apparatus therefor, and more particularly, to ensure a surplus portion (hereinafter referred to as an upper burr) of an upper mouth portion generated when blow molding a hollow molded article. The present invention relates to a method and an apparatus for recovering the top beam of a hollow molded product.
[0002]
[Prior art]
As a general method for forming a hollow molding product made of synthetic resin, a synthetic resin parison melted and discharged from a die of an extruder of a hollow molding machine is introduced into the molding die, and the molding die is closed to close the parison. After sandwiching and cutting with a hot cutter, the air blowing nozzle provided in the nozzle blowing device is lowered into the parison and driven, and air is blown into the parison via the air blowing nozzle. There is known a blow molding method in which a hollow molded product is obtained by enlarging and closely contacting a cavity of a molding die. The hollow molding machine is provided with a mold clamping device for opening or closing the molding die.
[0003]
In this blow molding method, a hollow molded product obtained by blow-molding a parison is suspended together with the generated top beam by an air blowing nozzle that has been lowered and driven, and subsequently moved to a molding die. Is transferred to and held by the holder for hollow molded products attached to the air blower, and is released from the air blowing nozzle by raising the air blowing nozzle, and then held in the holding body for hollow molded products. The product is moved to the take-out position.
[0004]
Occurrence of the top flash in this blow molding method is because the parison introduced into the molding die is slightly protruded from the molding die so that the upper part of the hollow molded product has a predetermined shape and cut with a hot cutter. This is because the protruding portion remains as a surplus portion (upper beam) when the air blowing nozzle is lowered and driven into the parison in the molding die.
[0005]
When the air blowing nozzle is driven into the parison, the upper beam is formed by a tapered inner peripheral edge of the counter plate positioned at the nozzle injection inlet of the molding die and an outer peripheral edge of the cutting sleeve positioned above the air blowing nozzle. And is sheared and cut.
[0006]
In the recovery of the top beam, for example, the hollow molded product attached to the air blowing nozzle together with the cut top beam is held by the holder for the hollow molded product, and the upper beam is attached to the air blowing nozzle by raising the air blowing nozzle. In the state, it is detached from the hollow molded product, and the upper burr is brought into contact with the drop plate at the lower part of the nozzle driving device by further raising the air blowing nozzle, removed from the air blowing nozzle and dropped into the space, and simultaneously with the dropping It is carried out by a method in which air is blown out from a nozzle located in the vicinity of the dropping position, and is blown into a wide-open shooter for recovery.
[0007]
As another method, a hollow molded product holding body having a housing on the upper surface portion, the upper beam is positioned in the housing to hold the hollow molded product, the air blowing nozzle is raised, and the upper beam is blown into the air blowing nozzle. After being removed from the hollow molded product while adhering to the air blower, the upper flash is brought into contact with the drop plate above the housing by further raising the air blow nozzle, removed from the air blow nozzle, dropped into the housing, and dropped. It is carried out by a method in which the blown air blown out from the flash is blown into a shooter connected to the housing and collected.
[0008]
Furthermore, as another method, after providing a continuous portion on the upper beam and leaving the upper beam on the hollow molded product, after holding the hollow molded product with the holder for the hollow molded product and removing it from the air blowing nozzle, The hollow molded product with the upper beam left is moved to the take-out position, and the upper beam is separated from the hollow molded product by mechanical means such as grabbing and cutting the upper beam at that position, and the upper beam is shootered. There is also a method of dropping into the collection.
[0009]
[Problems to be solved by the invention]
However, among these methods of collecting the top beam, the first method is effective in a narrow work area, but there is a space portion in an open state, so that the top beam that has not been blown into the shooter is hollow. In some cases, it may be scattered around the molding machine, and the top beam may not be reliably recovered.
[0010]
In the second method, the upper beam portion is inserted into the housing, and the upper beam is reliably recovered, but the housing is integrally installed on the hollow molded product holder. When the shape of the hollow molded product to be molded changes, in other words, when the hollow molded product holder changes, the housing and the shooter connected thereto must be replaced, and the core of the hollow molded product holder, etc. It takes time to get out. In addition, when a problem occurs around the hollow molded product holder, it may be difficult to check and recover.
[0011]
The last method is to leave the upper beam on the hollow molded product and remove it by mechanical means, and the upper beam is reliably recovered without scattering, but a special device is required for the mechanical means. It will be.
[0012]
[Means for Solving the Problems]
The present invention has been devised in order to solve the above-described conventional technical problems, and a parison discharged from a die of an extruder of a hollow molding machine is introduced into a molding mold that is opened, and a molding mold is introduced. A method for recovering the top flash of a hollow molded product in a hollow molding method in which an air blowing nozzle is lowered into the inner parison and driven to cut the top beam and blown by blowing air. burrs, is raised by attaching to the air blowing nozzle with air blowing nozzle, a bottom hole that is bored in the bottom plate of the ducted Haujin grayed for the upper beams recovered provided separately from the hollow molded article for holding body Then, the upper beam is removed from the air blowing nozzle by coming into contact with the inner peripheral edge of the nozzle insertion upper hole formed in the top plate of the housing. wherein in the bottom hole with the passage In the closed state by the shutter provided separately and for a molded article holder and is dropped into the housing it is, is characterized in that the upper beams dropped and so as to be discharged to the outside of the housing from the duct. Further, the apparatus for recovering the top flash of the hollow molded product of the present invention introduces the parison discharged from the die of the extruder of the hollow molding machine into the mold that has been opened, and air is introduced into the parison in the mold. A device for recovering the top flash of a hollow molded product formed by lowering the blow nozzle and driving it to cut the top flash and blowing the air to blow, the air blow nozzle having the generated top flash attached thereto A housing with a duct for recovering a top beam provided with a bottom hole drilled in a bottom plate, and a nozzle insertion upper hole drilled in a top plate through which only the air blowing nozzle is inserted; wherein the said housing bottom hole Ri Do and a shutter for opening and closing the, and wherein the separately provided, such by Rukoto the ducted housing and the shutter hollow for a molded article holder. Further, the recovery device is characterized in that the housing is supported by being suspended by a nozzle driving device provided with the air blowing nozzle.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a method and apparatus for recovering the top flash of a hollow molded product in the hollow molding method of the present invention will be described in detail with reference to the drawings.
[0014]
The blow molding method and apparatus for a hollow molded product according to the present invention will be described. First, as shown in FIG. 1, a synthetic resin melted and discharged from a die (not shown) of an extruder of a hollow molding machine. The parison P is introduced into a pair of molds 1 in an open state, the mold 1 is closed, the parison P is sandwiched, and the parison P is cut with a hot cutter (not shown). Intrinsic to mold 1.
[0015]
Subsequently, the molding die 1 is positioned below a nozzle driving device (not shown) including an air blowing nozzle 2 and a cutting sleeve 21 and a nozzle body 22 positioned above the air blowing nozzle 2, and is placed in the parison P. The air blowing nozzle 2 is lowered and driven, and air is blown into the parison P through the air blowing nozzle 2, and the parison P is enlarged and brought into close contact with the cavity of the molding die 1 and blown into the hollow molded product 3. Mold. Reference numeral 23 denotes a shaft or the like that suspends the housing 4 or the like, and is fixed to a nozzle driving device main body (not shown).
[0016]
The hollow molded product 3 obtained by blow-molding the parison P is obtained when the air blowing nozzle 2 is driven into the air blowing nozzle 2 as shown in FIG. It is suspended together with the generated upper beam 31.
[0017]
Next, the hollow molded product 3 is transferred to and held by a holder (not shown) for the hollow molded product attached to the molding die 1 that has been moved along with the movement of the molding die 1, and an air blowing nozzle. 2 is released from the air blowing nozzle 2 and lifted away from the air blowing nozzle 2 with the upper flash 31 left in the air blowing nozzle 2 and held by a hollow molded product holder (not shown) to form a hollow molded product. 3 moves to the take-out position.
[0018]
During the blow molding process of the hollow molded product 3, the parison P introduced into the molding die 1 is slightly protruded from the molding die 1 so that the upper part of the hollow molded product 1 has a predetermined shape, and a hot cutter (FIG. Therefore, when the air blowing nozzle 2 descends into the parison P in the molding die 1 and is driven in, the protruding portion remains as a surplus portion and an upper flash 31 is generated. The upper beam 31 is formed when the air blowing nozzle 2 is driven into the parison P or after it is driven, and the inner peripheral edge of the counter plate 11 located at the nozzle driving inlet of the molding die 1 and the air blowing nozzle 2. It is sandwiched between the outer peripheral edge of the cutting sleeve 21 located above and cut in a shearing manner.
[0019]
The upper flash 31 left in the air blowing nozzle 2 is formed in the bottom plate of the housing 4 together with the air blowing nozzle 2 by raising the nozzle body 22 of a nozzle driving device (not shown) as shown in FIG. It passes through the bottom hole 42 for nozzle insertion and is inserted and positioned in the housing 4.
[0020]
At the same time as or after the passage of the nozzle insertion bottom hole 42 of the air blowing nozzle 2, the shutter 5 moves to close the nozzle insertion bottom hole 42 and drop it into the housing 4 as shown in FIG. 3. The upper beam 31 is prevented from scattering outside the housing 4. The shutter 5 is a flat plate made of synthetic resin or metal, and slides to close the bottom hole for inserting the nozzle in the left and right or front and rear directions by the operation of an air cylinder or the like.
[0021]
The upper beam 31 inserted / positioned in the housing 4 is an upper hole for inserting a nozzle formed in the top plate of the housing 4 as shown in FIG. 41 is brought into contact with the inner peripheral edge of 41 and removed from the air blowing nozzle 2 and falls into the housing 4. The dropped upper beam 31 is provided in the housing 4 from the duct 43 attached to the housing 4. It is discharged out of the duct 43 and collected by air ejected from a certain air outlet 44 or a suction mechanism (not shown) connected to the duct 43.
[0022]
The top beam 31 discharged out of the duct 43 is conveyed and collected by a conveying device (not shown) such as a belt conveyor or a shooter.
[0023]
In addition, the upper hole for nozzle insertion of the housing described above is an upper surface side top plate body having a diameter larger than the diameter of the top beam generating the top plate and a lower surface side having a diameter smaller than the diameter of the generated top beam. The hole diameter may be adjusted in accordance with the diameter of the generated top beam by making it double with the top plate and replacing the lower side top plate as necessary.
[0024]
【The invention's effect】
As apparent from the above description, according to the present invention, the top of the housing on the beams remaining air blowing nozzle, is inserted, located in a ducted Haujinku for the upper burr collected air blowing nozzles together is raised Since it is brought into contact with the inner peripheral edge of the upper hole for inserting the nozzle formed in the plate and dropped into the housing and discharged out of the housing through the duct, the upper beam can be reliably collected without being scattered. The burr can be easily recycled.
[0025]
In addition, since the upper beam collecting housing is provided in the lower part of the nozzle driving device and is separated from the hollow molded product holder, the necessary centering can be performed separately and the operation can be facilitated. .
[0026]
Furthermore, if the shape and size of the upper beam changes as the shape of the hollow molded product changes, it is dealt with by adjusting the hole diameter of the upper hole drilled in the top plate of the housing as necessary. It is something that can be done.
[Brief description of the drawings]
FIG. 1 is a process explanatory diagram showing a process of introducing a parison of the present invention into a molding die to form a hollow molded product.
FIG. 2 is a process explanatory diagram showing a process of suspending a hollow molded article of the present invention from an air blowing nozzle.
FIG. 3 is a process explanatory view showing a process of introducing and dropping the top beam of the present invention into the housing.
FIG. 4 is a process explanatory view showing a process of dropping and collecting the top beam of the present invention in the housing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Molding die 2 ... Air blowing nozzle 3 ... Hollow molded article 4 ... Housing 5 ... Shutter 11 ... Counterplate 21 ... Cutting sleeve 31 ... Upper beam 41 ... Upper hole 42 ... Bottom hole 43 ... Duct 44 ... Air jet 45 ... Housing fixing plate P ... Parison

Claims (3)

Introducing the parison discharged from the die of the extruder of the hollow molding machine into a mold that has been opened, and lowering the air blowing nozzle into the parison in the molding mold to cut the upper beam, A method for recovering the top beam of a hollow molded article in a hollow molding method in which air is blown and blow molded,
The cut on the beams, is raised by attaching to the air blowing nozzle with air blowing nozzle, and formed in the bottom plate of the ducted Haujin grayed for the upper beams recovered provided separately from the hollow molded article for holding body Pass through a certain bottom hole and place it in the housing, and then remove the upper beam from the air blowing nozzle by contacting the inner peripheral edge of the upper hole for inserting the nozzle formed in the top plate of the housing. As the upper beam passes, the bottom hole is dropped into a closed housing with a shutter provided separately from the hollow molded product holder, and the dropped upper beam is discharged from the duct to the outside of the housing. A method for recovering the top beam of a hollow molded product in the hollow molding method. Introducing the parison discharged from the die of the extruder of the hollow molding machine into a mold that has been opened, and lowering the air blowing nozzle into the parison in the molding mold to cut the upper beam, It is a recovery device for the top beam of a hollow molded product that is blow-molded by blowing air,
Provided with a bottom hole drilled in a bottom plate having a size for inserting the air blowing nozzle to which the generated top beam is attached, and a nozzle insertion upper hole drilled in the top plate through which only the air blowing nozzle is inserted a ducted housing upper beams for recovery was, and wherein said Ri Do and a shutter for opening and closing the bottom hole, provided separately from such by Rukoto the ducted housing and the shutter hollow for a molded article holder of the housing A device for collecting the top beam of hollow molded products. The apparatus of claim 2, wherein the housing is suspended and supported by a nozzle driving device having the air blowing nozzle.

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