EP0820950B1 - Installation for producing and storing reelable plastic pipes - Google Patents

Abstract

Equipment for continuous prodn. and storage of coilable semi-flexible plastic pipe includes an extruder (2) and a pipe wind-up unit (4). A storage device (1) between the extruder (2) and wind-up unit (4) continues to take off extruded pipe (3) from the extruder (2) when the wind-up unit (4) is halted temporarily. Pref. the intermediate storage unit (1) comprises a motorised drum (6) on which the extruded pipe (3) forms loose coils. The outer periphery of the drum is formed by freely rotating rolls (8) parallel to the drum axis. A guiding rake guides individual windings of the pipe (3) around the drum (6). Expansion of the windings on the drum (6) during stoppage of the wind-up unit (4) is prevented by bars, more pref. freely rotating rolls (9) at a radial distance from the drum rolls (8).

Description

The invention relates to a device for temporarily storing continuously fed, extruded, windable plastic pipes according to the preamble of claim 1.

Among the plastic pipes that are manufactured and stored with the system according to the invention plastic hoses are to be understood equally. This Plastic pipes are not rigid in themselves, but flexible, so that they are wound up can.

Plastic pipes are extruded in a continuous process. At the end of the extrusion lines a winder is usually available for thermoplastic pipes of this type a drum that produces tube bundles. These bundles of pipes will be finished of the winding process with plastic or steel straps and can then be removed become. A new winding process then begins.

The end users of plastic pipes are increasingly demanding that intermediate ties also be layered be made, i.e. after each layer around the Several intermediate ties were made around the circumference of the drum before the next one Location is wrapped. The advantage after removing the strapping is that the Pipe bundle not unwound. The problem with intermediate mechanical setting is that the take-up roll must be stopped. Associated with this is the problem that the Extrusion device still continuously produces the plastic tube, so that a Congestion results. With very flexible hoses, this is not a problem because the hose itself then bulge between the stopped winder and the extrusion device can and lies on the floor. This is the case with plastic pipes that are relatively stiff however not possible.

In Patent Abstracts of Japan, vol. 13, no. 565 (M-907), 14.12.89, & JP 01 236 173 A is one Device for temporarily storing a flexible, elongated material at the beginning specified type disclosed. For this purpose there is a fixed one in a housing Drum arranged, which rotates parallel to the drum axis on its outer surface Has roles. Concentric to the drum axis are at a distance from the rollers other roles that define a cylinder inner jacket. In the feed area for the material to be stored in the area of the outer rollers are located one above the other opposing feed rollers that pull the material between them. Corresponding the housing has pull-off rollers in the outlet area of the material. The cached Material is drawn into the space between the rollers using the rollers, the material being guided along the inner surface of the outer rollers is. The material then makes a U-shaped bend and then comes after it opposite direction guide on the rollers of the inner drum to the system to then pull off the material using the rollers. Unless more material of the intermediate storage device is fed as it is discharged via the rollers, moves the U-shaped bend along the interior space between the rollers.

FR-A-2 676 721 describes a device for storing and unwinding an elongated, flexible body discloses, for example the flexible supply of a soldering head. To this A fixed container is provided for this purpose. This has a helical shape Wall, with adjacent wall sections an intermediate space between define oneself. The hose starts from a fixed position from the bottom Intermediate space supplied and discharged again along the helix above. The hose lies against the outer surface of the container. This way the hose be pulled off, the hose inside the container moving from turn to turn abuts the inner surface of the container.

The invention has for its object to provide an improved device for the intermediate storage of continuously fed, extruded, windable plastic pipes of the type mentioned, in particular a perfect course of the plastic pipe in the intermediate storage device is to be ensured.

The technical solution is characterized by the features in the characterizing part of claim 1.

This creates a tube buffer, by means of which also relatively rigid plastic tubes with continuous extrusion process in the subsequent stopped winder can be interlinked. This has the advantage that the extrusion process does not have to be interrupted, even if the rewinder for the purpose the sporadic mechanical intermediate ties must be stopped. The invention System thus ensures a simpler manufacturing and storage process for windable plastic pipes and the intermediate binding. The cache device has a drum around which the plastic tube is wound is. The basic idea is, in the basic position, the extruded plastic tube in several Windings tightly to make the drum spiral or spiral. Basically it is of course also conceivable to turn the plastic tube around with just a single turn Drum, but then the storage capacity is relatively small. By a multiple Moving the plastic tube around the drum becomes the storage capacity accordingly elevated. If the take-up reel is stopped, so the windings widen around the buffer in the sense of increasing the diameter on, so that the expanding pipe spiral has a corresponding intermediate storage enables. Since the drum is driven, the diameter increase is the Pipe spiral supported. The guide rakes prevent the turns from crossing. The basic idea of this radial guide rake is that each other Adjacent turns are each guided between two fixed, radial bars. These rods can be arranged in a star shape, i.e. around the circumference of the drum several such boundaries are arranged around.

The "transverse" roles of further training according to claim 2 are to be understood that these extend transversely to the course of the plastic tube. By freeing the roles are rotatable, the friction between the plastic tube and the drum is minimized decreased.

The limiting elements of the further development according to claim 3 are preferably according to claim 4 around rods, in particular around freely rotatable rollers. This Rollers attached to the outside diameter prevent the pipe spiral from the storage space comes out. By freely rotating the rollers, the overall friction is reduced. As previously defined, "transverse" means that the Extend the rollers transversely to the path of the plastic pipe.

Fig. 1

eine Seitenansicht der Zwischenspeichervorrichtung der Anlage;

Fig. 2

eine Vorderansicht der Zwischenspeichervorrichtung in Fig. 1;

Fig. 3

in einer Seitendarstellung entsprechend der in Fig. 1 das Funktionsprinzip der Zwischenspeichervorrichtung.

An embodiment of a system according to the invention for producing and storing windable plastic pipes is described below with reference to the drawings. In these shows:

Fig. 1

a side view of the temporary storage device of the plant;

Fig. 2

a front view of the intermediate storage device in Fig. 1;

Fig. 3

in a page representation corresponding to that in Fig. 1, the principle of operation of the intermediate storage device.

The system for the production and storage of windable plastic pipes has as middle plant part on a buffer device 1. To the right of it is (not shown) a conventional extrusion device 2 for continuous production, i.e. Extruding plastic pipes 3. Left of the buffer device 1 is a (also not shown) conventional winding device 4 below Use of a winding drum.

The intermediate storage device 1 has a frame 5. There is a drum in this frame 6 rotatably arranged by means of a motor 7. The surface of the drum 6 has freely rotatable rollers 8 parallel to the axis of rotation.

Concentric around the drum 6 are also in the frame 5 to the axis of the drum 6 parallel, also freely rotatable rollers 9 are arranged. Finally, the frame 5 Guide rake 10 in the form of rods 11 arranged in a star shape. Every star is there here - as can be seen in Fig. 1 - each from six rods 11. The front view in Fig. 2 shows that several such stars are arranged side by side, wherein adjacent bars 11 each define an intermediate distance.

The system works as follows:

The plastic tube 3 produced in the extrusion device 2 first becomes the intermediate storage device 1 fed. The plastic tube 3 with several turns around the drum 6 helically between the guide rakes 10 with the bars 11 passed through. At the rear, the plastic tube 3 is made from this intermediate storage device 1 led out and the winding device 4 fed. In the initial state is the drum 6 is driven by the motor 7, and the plastic tube 3 lies with its helical turns close to the rollers 8 of the drum 6.

As soon as an intermediate setting is to be carried out in the winding device 4, the winder 4 is stopped while the extrusion device 2 continues works continuously. By stopping the winding device 4, the windings of the plastic tube 3 gradually expanded on the drum 6. In Fig. 3 this is indicated by the different stages a to c, stage a being the inner initial turn represents stage b an intermediate stage and stage c finally a stage, in which the plastic tube 3 partially abuts the rollers 9 of the frame 5. This one Rollers 9 are freely rotatable, the friction is reduced.

As soon as the intermediate setting has taken place in the take-up device 4, it is in again Gear set and the plastic tube 3 rewound. The winder 4 will then drove briefly at an increased speed so that the turns reduce again and ultimately level a is reached again.

In the exemplary embodiment, the storage volume is, for example, 25 m. this makes possible it, the winding device 4 at 10 m / min extrusion speed for about 2.5 min to stop without having to interrupt the extrusion process.

Reference list

1

Cache device

2nd

Extrusion device

3rd

Plastic pipe

4th

Take-up device

5

frame

6

drum

7

engine

8th

role

9

role

10th

Lead frame

11

Rod

Claims (4)

1. Device for intermediate storage of continuously supplied extruded plastic tubes (3) which can be wound,
   with a drum (6) about which the plastic tube (3) is guided,
   characterised in that

   the drum (6) is driven,

   the plastic tube (3) is wound about the drum (6) with several helical windings in the same direction and

   radial guide rakes (10) are arranged to guide the individual windings of the plastic tube (3) about the drum (6).
2. Intermediate storage device according to any of the previous claims, characterised in that
   the drum (6) has transverse, freely rotatable rollers (8) about the periphery.
3. Intermediate storage device according to any of the previous claims, characterised in that
   transverse limiting elements are arranged about the drum (6) with radial spacing to limit the expansion of the windings.
4. Intermediate storage device according to claim 3,
   characterised in that
   the limiting elements are bars, in particular freely rotatable rolls (9).

Images