DE2006258A1 - Injection and blow molding machine for the continuous production of hollow bodies from plastic material - Google Patents

Description

International Press Development Establishment Vaduz (Liechtenstein)

Injection and blow molding machine for the continuous production of hollow bodies from plastic material

The invention relates to an injection and blow molding machine of horizontal or vertical type for the production of hollow bodies from plastic material.

The manufacture of hollow bodies by injection molding, the Downstream blow molding has been around for a long time 3 already known · This procedure is so far for the Production of special types of hollow bodies, which generally have thin walls and are without spout or burr, been used

The known ones used to carry out this process Molding machines have a low output they work with one or more injection mandrels, which alternate first in one or more injection molds, where the deformation takes place, and then immersed in a blow mold, where the hollow body is completed, as well as at closing transferred to a demolding station »if the injection mandrel is in one of these stations the others remain inactive with this mode of operation, what the main reason for the low productivity of this known machines is "

The object of the invention is now to provide such a 3-form machine designed in such a way that every injection mold or press

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Station or demolding station has no idle phase, except for the time required to transfer the spray mandrel or the spray mandrels from a mold or from one series of dies is necessary to the next »

According to the invention this is done with an injection and blow molding

Tnehrcre machine, which is achieved by one or more injection molds, which are arranged alternately with one or more blow molds and one or more demolding stations on a circle at equal angular distances from one another and are characterized by several injection mandrels, the number of which is equal to the number of injection molds, blow molding and demolding stations , and which are arranged unadjustably evenly distributed on a circle, the diameter of which is the same as that of the circle on which the injection molds, blow molds and demolding stations are located, with the injection mandrels corresponding to the injection molds, blow molding and demolding stations intermittently in the axial direction and along the circle the angular distance between an injection mold and a blow mold can be moved in such a way that some injection mandrels can be inserted into the injection molds and others into the blow molds and the remaining injection mandrels are positioned in the removal stations dnet are. The injection molds and the blow molds are preferably fastened to a stationary plate, while the injection mandrels are arranged on a platform, * in the axial direction with respect to the injection molding

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forms movable and / is rotatable.

Each injection mandrel is surrounded by a ring for demolding, which is at the level of the individual demolding stations Using a hydraulic or pneumatic device, along the spray mandrel is presented to the formed Eject hollow bodies .. The activity of this device is effected via the movable platform.

In this way, a molding machine is obtained at welchar At the same time, the Vox form was produced in the injection molds

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as well as in the subsequent molds the blow cycle is carried out, and in " ¹ the de-forming stations the ejection process of the finished hollow body takes place. Thus, continuous processing is achieved in all molds, as well as in all demolding stations of the machine, without an idle phase

Of course, the injection molds are coupled with the extruder, their injection nozzles into these molds through bores in the inject fixed plate '

There are also means provided with which the platform adjusted back and forth in the axial direction and intermattiere can be rotated «,

On the fixed plate there are still devices for opening and closing the molds, mainly the blow molds arranged The injection molds are preferably made in one piece to form the base of a strip to avoid on the preform, as is the case with the known ones Forms took place. This strip is in the following one Blowing process cannot be eliminated "

An exemplary implementation of the invention is It is still described on the basis of the drawings:

1 shows a section through an inventive Molding machine, taken along line 1-1 of Figure 3;

FIG. 2 shows a schematic view of the molding machine according to the invention according to FIG. 1; ^!

3 is a plan view of the fixed lower plate of the molding machine according to the invention according to FIG.

Fig «, 4 a section along the line IV-IV of Fig. 3; ^. .

■ -..- Pig β 5 a section along the line V-V of Fig *

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As can be seen from the drawings, the inventive Forming machine, regardless of whether it is designed as a vertically or horizontally working fascine, two fixed plates 1 and 2 arranged parallel to one another at a distance. Plates 1 and 2 are on the side Rods 3 and 4 and an axial column 5 interconnected

Between the two plates 1 and 2 is a platform 6 with sleeves on the column 5. The platform 6 is free movable along the column 5 and rotatable around the column. The axial position of the platform 6 is made movable by two and parallel upper cylinders 7 and 8 as well as a movable lower cylinder 9 controlled illustrated case the cylinders 7 and 8 a movement of the platform 6 downwards and the cylinder 9 in the opposite direction Direction d.ho up. The cylinders 7 and 8 work by pressure, without restrictions, against the platform

6 and are movable relative to fixed pistons 7 'and 8 ^1.

Each piston 7 'and 8' is provided with a rod 10 and 11 _o fixed to the bottom of two cylindrical seats 12 and 13. The seats 12 and 13 may be secured to the top plate 6 or formed integrally with them and serve the cylinders 7 and 8 as a guide.

The lower cylinder 9 surrounds the column 5 and acts on it the platform 6 by pressure, without any restrictions.

The cylinder 9 slides in a cylindrical seat 9 'which is fixedly connected to the lower plate 2 or formed in one piece therewith. The cylinder 9 is displaced like a piston by pressurized liquid which flows into the pressure chamber 9 ″.
Thus, the platform 6 can under the action of the cylinders

7 and 8 are either lowered into the pressed position and pushed down or under the action of the cylinder 9 can be raised again.

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The platform 6 has a collar 14 which. the column 5 includes. This central collar 14 (Fig. 3 and 5) has a crown cam on the cylindrical outer surface, that of vertical grooves 15, di-e ^ alternating with in the same Direction inclined grooves 16 are connected consists "

A fixed pawl 17 engages in these grooves, which alternate in the vertical 15 and inclined 16 Grooves running.

When the platform 6 is raised, one of the inclined grooves is standing 16 in operative connection with the pawl 17, whereby the platform6 is rotated by a certain angle «The rotation is preferably carried out on the last part of the lifting distance of platform 6 «

A sleeve 4 ¹ with a groove 4 ″ is attached to the rod 4, in which a sliding shoe 6, carried by the platform 6, engages, so that the platform 6 is guided exactly in the desired Y / angular position. Of course, there are so many sliding shoes 6 * how rotary movements must be carried out so that the platform 6 makes a complete revolution «■ -

The platform 6 carries spray mandrels 18 on the underside, in the present example six pieces, which are distributed and spaced along the circumference and with the axes perpendicular are arranged to the area of the platform "

These spray mandrels 18 each have an axial bore 18 », which is via a pipeline 1-9 (Pig.'4). ,and one Manifold 20 are connected to a compressed air supply line · The spray mandrels 18 are designed so that they can both for injection molding as well as for blow molding can be used «. The axial bore 18 'is through a valve'18 "closed, which is closed in the injection phase and only opens when blowing.

At the base of each injector 18 is a ring 21 provided, shifted achaial relative to the fuel pin can be.

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The plate 2 has a - "- one of shapes on the top whose axes are distributed on a circle o This circle has the same diameter as the circle on which the axes of the spray mandrels 18 are arranged. In the embodiment described, two are diametrical Opposite injection molds 22 are provided (FIGS. 1 and 3), which are used for injection »Each of these molds 22 consists preferably of a single piece and has a cavity which is dimensioned to provide a certain gap arises between its walls and the spray mandrels 18, when one of the injection mandrels 18 is fully inserted into the injection mold 22.

As can be seen from Figure 11, the injection molds 2; mounted on bores 23 in the plate 2, into which the head parts of screw extruders 24 protrude are known and inject the plastic material into the injection molds 22.

In the example of FIG. 1, the extruders 24 are of a vertical type and have feed hoppers 25 which hold the plastic feed material in granular form to the cylinder of the corresponding extruder 14, where it is heated, plasticized and from a screw 26 is conveyed to the injection head. Then the material is moved axially by the screw

26 injected «The screw 26 is shifted

in a manner known per se with a piston and cylinder

27 existing devices o

The extruders are carried by a cross support 36 and are pressed against the injection molds 22 with the aid of a piston 36. The piston 36 works in a hydraulic cylinder 37.

On the circle on which the axes of the injection molds 22 lie, the axes of two blow molds 28 (see FIGS. 1, 3, and 4) are also arranged. The blow molds28 have a Uinkol distance from the Jaetftformen 22 which is the same that / injection mandrels 18 is. The blow molds 2ö are from usual design. They consist of kiwei half-forms that of

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appropriate facilities or _o ge ^ 29 and 30 open - can be sehlossen "■

On the circle on which the axes of the injection molds 22 and blow molds 28 are still at the same angular distance on the plate 2, two bores 31 are arranged, the lie diametrically opposite each other «. .

Above each bore 31 there is a gate direction for demolding, which consists for example of a fork 32 with lateral and vertical arms and is moved by a double-acting hydraulic jack 33 so that it can be raised or lowered. When lowering, the parallel rods or arms pass through Openings in the platform 6 and actuate the ring 21 - which comprises a spray mandrel. The bores 31 and the corresponding forks 32 with lifting jack 33 form the demolding station, di <i are arranged at the same angular distance as to the injection molds 22 and blow molds 28, as Vs these are to each other c.

From the above: description is'obvious that with each rotational movement of the platform 6 two spray mandrels coaxial with the injection molds 22, two injection mandrels coaxially with the blow molds 28 and two injection mandrels 18 come to rest in the demolding station.

When the platform 6 is lowered, two injection mandrels 18 penetrate the injection molds 22. in order to press the preform, and two further injection mandrels 18 penetrate the final blowing of the hollow body to be produced using. of compressed air into the blow _{molds28 o} The compressed air is fed through the injection mandrels 18 under the appropriate control « _r -.-, ■ -

When lifting, the platform 6 is rotated a little, which is equal to the angular distance between the molds, or between the injection mandrels, which is why the blown ones

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Bodies are brought into the demolding station. There the forks 32 move the rings 21 with the lifting jack 33, which causes the blown hollow bodies to fall off ο The hollow bodies fall through the bores 31 of the Plate 2ο Then the platform 6 is lowered again, two free injection mandrels 18 in the injection molds 22 and two injection mandrels 18 which are provided with preforms, are introduced into the blow molds 28, These work phases are repeated in such rapid succession that the The preform cannot cool down.

It is obvious that the number of spray arbors and the number of molds and demoulding stations can be changed, depending on the size of the one to be produced Hollow body or the dimensions of the molding machine can be dependent.

• For example, instead of two injection molds, the with "] alternate two demolding stations, also 3 or more Injection molds alternating with three or more blow molds and three or more demolding stations can be provided. the Molding machine can also have two or more injection molds lying next to one another, for example / arranged alternately with the same number of blow molds also arranged adjacent to one another and with the same number of Have demoulding stations. The number and arrangement of the injection mandrels is the same as that of the injection molds, Blow molding and removal stations. Of course, the invention is not limited to the above Execution described and shown as an example form, but it also closes for the ϊ * ± ί Changes obvious to a person skilled in the art without coming out of their field.

two blow molds and

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Claims (1)

9 - PiTENI AHSPRiJOHE \ lc j X. Injection and blow molding machine of horizontal or vertical design with at least one injection mandrel, an injection mold, a blow mold and a demolding station for the production of hollow bodies from plastic material, characterized in that one or more injection molds (22) alternating with one or several blow molds (28) and one or more demolding stations on a circle at the same angle, labs to each other and further several injection mandrels (18), the number of which is equal to the number of injection molds (22), blow molds (28) and demolding stations, against each other are arranged unadjustably evenly distributed on a circle, the diameter of which is equal to that of the circle on which the injection molds (22), blow molds (28) and demolding stations are located, the injection mandrels (18) opposite the injection molds (22), blow molds ( 28) and demolding stations in the axial direction and along the circle intermittently according to the angle distance between an injection mold (22) and a blow mold (28) can be moved so that some injection mandrels (18) can be inserted into the injection molds (22) and others into the blow molds (28) and the remaining injection mandrels (18) can be inserted into the demolding stations are arranged. 2.! Molding machine according to claim 1, characterized g e k e n'n ζ e i et that the injection mold (22) and the blow molds (28) on one fixed plate (2 ') are fixed ^ which at the level of the demoulding stations bores (31) for discharging the has finished hollow body, and that this plate (2) by means of side bars (3, 4) on a central column (5), the axis of which runs through the centers of the circles, on which the injection molds (22), the blow molds (28) and the Demolding stations and the injection mandrels (18) are arranged / fixed plate (1) is connected. 009843/1664 3ο molding machine according to claim 1 or 2, characterized in that the injection mandrels (18) are attached to a movable platform (6) which, § | ⁿ if ^a l by means of a collar (14) on the column (5? / ist and for axial displacement along the column (5) as well as for intermittent rotation the column (5), each rotation being equal to the angular distance between the spray mandrels ( 18) or _o between the alternately arranged molds (22, 28) " 4o ^ Molding machine according to one of the preceding claims, characterized in that the platform (6) for introducing the injection mandrels (18 'into the injection molds (22- * and for generating pressure during molding and, with hydraulic devices (7, 7') , 8, 8 ¹ ) works together, these devices (7, 7 ', 8, 8') being attached to the fixed plate (1), and that further at least one hydraulic device (9, 9 ', 9 ") for Removal of the platform (6) from the stable is provided 5ο molding machine according to one of the preceding claims, characterized in that for intermittent c Rotate the platform 66), the i3undring (14), with a Kroncnnocken is equipped with axial grooves (15) which are alternately connected with inclined grooves (.16), consists, wherein when removing the platform (6) from the mold position a pawl (17) so in an inclined role (16) slides so that the platform (6) experiences a rotation on the last section of this distance movement Do molding machine according to one of the preceding claims, characterized in that each of the demolding stations comprises a ring (2?) Which is axially adjustable on an injection mandrel (18), as well as a device ₍ which also includes a ring (21) _r Gabol (32) acting through holes in the platform (6) and a hydraulic jack (35) that moves the fork (32) back and forth. 009843/1664 7. Molding machine according to one of the preceding claims, characterized in that a number of extruders (24) of known type are provided at the level of the injection mandrels (18), which are connected via bores (23) in the plate (22) carrying the injection molds (22). 2) with the Spritzforraen (22) are connected, said extruder (24) carried by a transverse support (35) and are brought into the Einspritzpoßition with a ¹ hydraulic .Druckvorrichtung (36, 37) *, _ ■ 8. Molding machine according to one of the preceding claims, characterized in that the injection mandrels (18 axial bores (Ί8 ¹ ) have a pressluxtverounden so that they act as small blowholes when engaging in the blow molds. 9β Molding machine according to one of the preceding claims, generally characterized in that the injection molds (22) consist of one piece _c 1O ₀ molding machine according to any one of the preceding claims, characterized geke η η ζ eic ^v h η et that the blow molds (28) are mounted together with the means (29, 30) which cause the opening and closure on the plate (2) . 00984.3 / 1664 " Blank page