DE2058591B2 - Device for producing container-shaped hollow bodies made of thermoplastic material - Google Patents

Description

The invention relates to a device for producing container-shaped hollow bodies made of thermoplastic Plastic or a similar injectable material, with one or more hollow bodies through Inflation of a hose or several hoses at the same time in a two-part or multi-part blow mold, which between the ring nozzle of an extruder head and a distant station in which the blown hollow body can be removed, is movable back and forth, manufactured and if necessary can be filled and sealed at the same time, wherein the tube is axially movable through the nozzle at the speed of the blow molds Blowpipe inflated and the resulting hollow body filled with the filling mandrel if necessary and immediately afterwards the hollow bodies in the blow mold can be closed as a container, the Movement of several blow molds runs in the direction of the nozzle axis and the hollow body on the continuous Strand are formed.

The general prior art includes devices for producing container-shaped devices Hollow bodies made of thermoplastic known in which an open blow mold directly below the nozzle receives the extruded hose, this inflated there with a blow pin or blower needle and released as a finished hollow body after cooling will.

According to another known method is through a filling mandrel, which through the middle F. extruder nozzle together with a blow pin can be inserted into a blow mold driven underneath, which Molded hollow bodies filled in a hurry with filling material, closed and dispensed from the blow mold (DE-AS 12 04 57 3).

These known proposals have the disadvantage that only a single blow mold is used can be, which limits the performance.

There was no remedy for this either, in

Further development of a device for the production, filling and sealing of hollow bodies made of thermoplastic Plastic (DE-AS 12 72 807), each set up a separate blowing and filling station and to work alternately with two blow molds. The performance increased in proportion to the effort, only inadequate.

There are then still various devices with pivotable mold carriers are known that with equipped with several blow molds, a solution to the problem of increased performance and economy should bring (LJS-PS 31 54 809). There is a filling and closing process in these swivel shapes is not provided, they could not prevail in practice.

The expected advantages could not be achieved with the continuously working, so-called Celtic machines, in which a large number of blow molds are arranged on a revolving chain or a similar carrier, each of which receives a hose section from the Eixtruder nozzle as soon as it is under the same urd by which the production of the hollow body takes place on the further path of the embossing (DE-AS 12 o5 395). This also applies then. if the hollow body is filled and closed at the same time (DE-AS 11 80 301), because in general the number of blow molds required is too large and their replacement when changing the zi manufacturing iiuhlkörpeis au is expensive.

Finally, a device has become known with which for the production of hollow bodies on the continuous Strand, in the so-called hand overhand process, is worked with only two blow molds (DE-AS 11 37 854). Each of the two blow molds is guided in spars that are opposite one another. The direction of leadership for both blow molds lies together in the extended axis of the extruder head and the .Hose strand. This has the consequence that a total of only two blow molds can be arranged because the one in the open state over the other, in the closed state, must be raised because this sequence of movements takes place in a common axis. One no further blow mold can be included in this sequence of movements, otherwise collisions will occur the blow molds would come among themselves.

However, this also undesirably restricts the performance of this device.

This resulted in the object on which the invention is based, namely the creation of a device existed, with the container-shaped with a simple structure Hollow body made of thermoplastic material on a continuous strand and, if necessary, also can be filled and sealed, the performance compared to known devices should be increased and their disadvantages had to be eliminated.

According to the invention, this object was achieved by a device of the type described at the beginning, in which three or four pillars, each with a blow mold, are arranged on a machine frame around a head, with each pillar for a vertical one taking place in the pillar movement of the blow molding a Gleitbuchsc and a Axialhubeinheit are assigned and each column is a further rotary unit or KURL / eltrieb-Dreheinrichlung for horizontal movement de ^r blow molding provided for Säulcnachsc and that oie blow molding successively pivoted under the extruder head, then vertically in the extruder head axis from the The nozzle can be lowered, then swiveled out horizontally and the extruder head axis, then raised parallel to the extruder head axis and swiveled back in horizontally under the extruder head at the top.

To bring about the horizontal movement of the blow molds in the direction of the extruder head and from this way, the columns are rotatably mounted and to generate a circular arc path for the blow molds by means of the rotating unit designed as a cylinder-piston arrangement or by means of the crank drive rotating device rotatable.

You can just as easily generate the horizontal movement of the blow molds in the direction of the extruder head and away from this, the columns can be arranged in a rotationally fixed manner and the blow molds with the mold carriers on the Gleilbuchsc located guide rods store on which the blow molds straight and radial to Exlruderkojif are displaceable.

It is also possible that ζ. Achievement of Horizontal movement of the blow molds in the seal to the Extruder head and away from this, the columns are rotatably arranged and the blow molds with the mold carriers for generating a circular arc path for the blow mold 2n by means of the crank drive rotating device are rotatable.

For safe sealing of the pressure space inside the blow mold against the following hose when blowing, filling and sealing eggs hollow bodies, is due to a temporary narrowing of the annular gap-shaped space between the blow mold, the Blow pin and the hose enclosed in between at least one sealing jaw against the Hose and at the same time the hose can be pressed against the blow pin.

When filling and closing the hollow body can be used to seal between the neck of the blow mold, the) Hose and the) blow pin in the area of the seal / <ine in the blow mold an inflatable, heat-resistant, / wide-part plastic hollow ring can be provided, the when inflating the king-halves the tube like a Tire encloses.

In a further embodiment of the invention, the hollow body is used for filling and sealing Sealing in the area of the dichl / one on the surface of the blow pin a bead-like thickening is provided, when it enters the seal / one of the blow mold Hose is inevitably pressed against the wall of the mold without air swirl.

The particular advantages of the device according to the invention are that in a simple manner the Possibility has been created. Hollow body made of plastic plastic on a continuous strand, also filled and sealed, with a selectable one that exactly matches the respective performance.> requirement Number of modular blow molds that can be used, i.e. from the most economical point of view and thus while avoiding the disadvantages of the known devices to be able to produce.

The following are examples of the invention described with reference to the drawing. In the pictures shows

Fig. La is the partial, schematic view of the device for Hc \ siellung hollow bodies on continuous strand with a column for guiding a blow mold;

Fig. Ib top view of four blow molds in different

iicn positions, with the arrangement accordingly Fig. la mii four pillars of leadership;

Cig. 2a a modified drive and I iili ring part for the movement of the shape around the Column axisc;

I i g. 2b the top view of the drive and Guide part according to [■ "i g. 2a;

I i g. 3 the top view of four blow molds in different positions in a crank arrangement tion according to Γ i g. 2a and 2b;

("Fig. 4-8 the step-by-step work sequence of the process / to manufacture, fill and seal

1 hollow bodies on the continuous strand.

On a machine frame are around the extruder head 11 'arranged around four columns 1, each one (jlcitbuehse 2, carried by an Axialhubeinhcit 3 Via their lifting rod 3 'parallel to the extruder head axis 11 is up and down. The movement of the CJIcitbuchse 2 is aiii the Hubstangc 3 ' fixable switching cams 18, 19 and assigned limit switches 20, 21 controlled.

The (ileitbuchscn 2 are provided with two parallel guide rods 5 Fxtrudcrkopf Il 'facing linden there are mold carriers 10, which carry the halves of the blow mold 9 and open and close them. At their opposite find is located between the Guide rods 5. for actuating the same, a lifting unit 6, which over the guide rods 5 and the Mold carrier 10 can move the blow mold 9 towards F.xtrudcrkopfachsc 11 and away from it.

The columns I are rotatably mounted to a hori / .ontalbewcgung the blow molds 9 in the direction of To enable extruder head Il 'and away from it. To generate the rotary movement is on the upper linden tree a rotating unit 4 is arranged on each column 1.

This device structure enables a sequence of movements of the mold carriers 10 with the blow molds 9, in that by alternately turning the columns 1, by moving the glass jacks accordingly up and down

2 and by moving the lifting units 6. the blow molds 9 in constant change one after the other swiveled in the extruder head 1Γ, then vertically in the F. extruder head axis 11 lowered, at the F.ndc this Lowering swiveled horizontally out of the extruder head axis 11, then again parallel to the extruder head axis 11 raised and finally swiveled in again horizontally under the extruder head 1Γ at the top will.

During the period in which a blow mold 9 is pivoted under the extruder head 11 '. is then lowered in the extruder head axis 11 until it is pivoted out of the same, happens! the production, filling and sealing of a hollow body 17 on the continuous strand, so that the extruder can run continuously and constantly ejects a hose 16 as a deformation.

From the entire sequence of movements, a current position of four mold carriers 10 with blow molds 9 is recorded in FIG. 1b. The mold carrier 10 (position I) is swiveled under the extruder head 11 'and has taken over the tube 16 from which the hollow body 17 is inflated by the blowing mandrel 24 and is filled immediately by the filling mandrel 25. The lowering then begins in the extruder head axis 11, with the hollow body 17 also being closed.

Pivots after a sufficient lowering distance

the second mold carrier 10 (position II) with open Blow mold 9 in the uppermost, vacated position untci the extruder head I Γ and takes over the clever) 16 under l'ormsehluü. Then again there ' Inflating, filling and sealing the hollow body 1 / and lowering it.

The third mold carrier 10 (position III) is located still outside the rudder head axis Il UtK then swivels by actuating the turntable name 4 and rotation of the column 1, in the position Il de? previous I ormcnträger 10 a.

The fourth mold carrier 10 (position IV) is also still outside the I.xtruderkopfachsi I Γ and moves from its lower position, guided by the (»leitbuchsc 2 on the column 1, up to its upper position, in which its blow mold 9 is then finally brought animal by rotating column 1 under i \ cn extruder head 1 Γ

In a simplified embodiment of the before direction is a modified drive and l'guide part for the movement of the blow molds 9 around the column I according to Figs. 2a and 2b the column 1 is fixed and the rotating unit 4 (I ig. la, Ib) designed as a cylinder-piston arrangement is omitted whose place is provided on the Gleitbuchsc 2 a crank drive rotating device 15, which is from a motor 14 is driven and the connecting rod 13 of the Fonnen'räger 10a with the blow mold 9 around the fixed column 1, in the direction of the Fxtrudcrkopf I Γ and away from this. pivots.

The two halves of the blow mold 9 are supported on the guide rods 50 located on the mold carrier 10a and are simultaneously opened and closed with the movement of the connecting rod 13, i.e. when pivoting around the stationary column 1, as shown in FIG. 3 is shown.

When using the crank tricbcs (I ig. 3), the columns 1, if four blow molds 9 are provided analogously to the arrangement according to FIG. The mode of operation does not fundamentally change, which is evident from the current position of a movement sequence shown: The first mold carrier 10a (position Γ) is located under the F. extruder head 1Γ and the blow mold 9 has taken over the tube 16, from which four hollow bodies are here 17 are made, filled and sealed.

After the first part of the subsequent lowering, the second mold carrier 10a (position II '), with the blow mold 9 then open, swivels into the uppermost, vacated position under the extruder head 11 ', takes over the next tube section with positive locking and begins lowering.

The third mold carrier 10a (position IIP) is located outside the extruder head axis 11, guided by the axial lifting unit 3 on the column 1, on the way up to then pivot into the position under the extruder head 11 ', in which the blow mold 9 is the next Receives hose section.

The fourth mold carrier 10a (position IV) also occupies a position outside the extruder head axis 11, namely the one in which the two halves are located the blow mold 9 for dispensing the filled and closed hollow body by actuating the Fühningssiangen 50 have been opened.

In this arrangement, all four mold carriers 10a and the associated blow molds 9 are each

a crankshaft drive mechanism 15 with a connecting rod 13 actuated, which are only shown in one place (position Γ) in the drawing.

Figs. 4-8 'own one sequence of operations for producing, grooving and sealing a hollow body 17 on the continuous strand in one Blow mold 9, on the way from its uppermost position under the extruder head If, to its lowest position, in which the finished hollow body is released.

The extruder head If is with a supply line 28 for Blown air, a feed line 29 for the filling material, a discharge line 30 for the exhaust air and a nozzle 31 for Formation of the tube 16 is provided.

In Fig. 4, the open blow mold 9 pivots into the The extruder head axis 11 under the nozzle 31. from which the hose 16 is continuously ejected. According to FIG. 5 then the blow mold 9 closes, the tube 16 is pushed through the blow pin 24, when it runs out to the opening of the blow mold 9, inflated to the hollow body 17, the filling begins through the filling mandrel 25 and the blow mold 9 lowers to the position according to FIG. 6 from, the filling mandrel 25 also runs out.

At the same time, the sealing jaws 26 have sealing against the hose 16 and this, gcgcr the blow pin 24 applied.

In the position according to Fig. 6, the hollow body is l;

filled, the high blowing pressure is via line 3 (

ι discharged and the blowing mandrel 24 and the filling mandrel 2 ' are completely au after loosening the sealing jaws 26; the blow mold 9 has been moved upwards.

Meanwhile, the next blow mold 9 is in the position according to FIG. 5 already closed at κι thereby the head bladder 32 in F i g. 6 trained.

When further lowering the blow mold 9 in di <

Position according to FIG. 7, the closing head welding jaws 27 form the final hollow body head 33, which is easily detachable with the continuous

i'i remaining hose 16 'remains connected.

Finally, the blow mold 9 reaches its lower position as shown in FIG. 8, in which it opens unc the finished, filled and sealed hollow body 17 releases. At the same time, the blow mold 9 swings out of the extruder head axis 11 horizontally and moves dam parallel upwards and swivels there again under the extruder head If to start a new work sequence zi begin, in whose cycle the other blow molds are also constantly.

For this purpose 4 sheets of drawings

Claims (7)

Patent claims: 1. Device for the production of container-shaped hollow bodies made of thermoplastic material or a similar sprayable material, where -, one or more hollow bodies by inflating a hose or several hoses at the same time in a two-part or multi-part blow mold, which is between the ring nozzle of an extruder head and a station distant therefrom, in which the m blown hollow body can be removed and is movable, manufactured and, if necessary, can be filled and sealed at the same time, the tube through the nozzle by means of axially at the speed of the blow molds r, inflated movable blowpipe and the resulting hollow body, if necessary, through the Filling mandrel filled and immediately afterwards the hollow bodies are sealed in the blow mold as a container can, with the movement of multiple blow molds> i> runs in the direction of the nozzle axis and the hollow bodies are formed on the continuous strand are, characterized in that on a machine frame around an extruder head three »of the four pillars, each supporting a blow mold (9)» -, (1) are arranged, each column (1) for a vertical movement taking place in the column axis the blow molds (9) are assigned a sliding bush (2) and an axial lifting unit (3) and each Column (1) a further rotating unit (4) or a crank drive rotating device (15) for horizontal movement de "blow molding (9) is provided for the column axis, and that you; blow molding (9) can be swiveled in one after the other under the extruder head, then vertically in the extruder cool axis (11) from r> the nozzle (31) can be lowered, then pivoted horizontally out of the extruder head axis (11), then parallel;: ur extruder head compartment (11) can be raised and can be swiveled in horizontally under the extruder head again at the top. to 2. Device according to claim!, Characterized in that that for the horizontal / .ontal movement of the blow molds (9) in the direction of the extruder head and from this way, the columns (1) rotatably mounted and to generate a circular arc path for the blow molding η men (9) by means of the rotating unit (4) designed as a cylinder-piston arrangement or by means of a crank drive rotating device (15) are rotatable. 3. Apparatus according to claim I, characterized in that for the horizontal movement of the Blasfor- ν ι men (9) in the direction of the extruder head and away from it, the columns (1) are arranged non-rotatably and the blow molds (9) with the mold carrier (10) on guide rods (5) located on the slide bushing (2), on which the blow molds (9) r> can be moved in a straight line and radially to the extruder head. 4. Apparatus according to claim I, characterized in that for the hori / .ontalbewcgung the blow molds (9) in the direction of the extruder head and away from it, the columns (1) are non-rotatably arranged and the blow molds (9) with the mold carriers (10) for generating a circular arc path for the Blow molds (9) can be rotated by means of the crank drive rotating device (15). 5. Apparatus according to claim!, Characterized in that that / to secure sealing of the pressure space within the blow molds (9) against the subsequent hose (16) when blowing, filling and closing the hollow body (17) by a temporary narrowing of the annular gap-shaped space between the blow mold (9), the Blow pin (24) and the hose (16) enclosed in between, at least one sealing jaw (26) against the hose (16) and at the same time the hose (16) can be pressed against the blow pin (24). 6. Device according to claims I and 5, characterized in that when filling and Closing the hollow body (17) for sealing between the neck of the blow mold (9) and the tube (16) and the blow pin (24) in the area of the dichl zone in the blow mold (9) an inflatable, heat-resistant, two-part plastic hollow ring is provided, Jer when inflating the ring halves the hose (16) encloses like a tire. 7. Device according to claims 1 and 5, characterized in that when filling and Closing the hollow body (17) for sealing in the area of the sealing zone on the surface of the BiasJürns (24) provided a wuKiai iigc thickening is, when it enters the sealing zone of the blow mold (9) the tube (16) inevitably is pressed against the wall of the mold without any air gap.