EP1640273B1 - Coiling device for removing cut binding material - Google Patents

Abstract

In a winding device for removing cut binding material (1) (especially metal bands) from bales, comprising guide(s) for the material, a receiver (2) with a winding surface (4) and a receiving slit (3) for gripping the material (the receiver being rotatable relative to the guides) and a device for axially moving the wound product from the receiver, the winding surface has a polygonal (preferably square) cross-section, the receiver is enclosed by two spaced press parts (5, 6) movable inwards towards the receiver and the inner surface (7) of the press parts is geometrically similar or identical to part of the winding surface.

Description

The invention relates to a winding device according to the preamble of claim 1.

Devices of this kind are e.g. used in the paper industry. Often, namely, the raw material for paper production, ie pulp or waste paper, delivered in pressed bales, which are held together by binding material, in particular wires or bands. Before the raw materials then e.g. in a pulper to be processed into an aqueous suspension, such wires or tapes must be removed as a rule. Although this can be done manually, but then it is dangerous and time-consuming. Therefore, devices of the type mentioned here have been developed, by means of which the removal of cut wires and tapes can take place automatically. Winding devices which can be used for such purposes are e.g. known from DE 28 21 336 C2.

When using the winding head according to the invention in a bale unbinding device, the winding device is preferably arranged such that it can engage on the opposite side of the bale of the bale. Before or after the band or the wire is severed on the opposite side, either the receiving part against the bale or the bale is driven against the receiving part such that its frontal working end is applied directly to the binding material to be removed. Then, when the receiving part is set in rotation, the tape or wire rinses, so that it is pulled off the bale and from it a small, solid winding is formed, which can be easily collected and transported away.

The receiving part is preferably located on a shaft of a motor, preferably an electric geared motor with a slow output speed. But it can also be provided, for example, a hydraulic motor. The motor is preferably designed so that it is adjustable in such a way that its shaft at a standstill a certain position relative to the absorbs binding material. This has the advantage that it is more safely and easily absorbed by the slots of the receiving part.

In order to compress bales together for transportation, in many cases round steel wires with e.g. 4 mm diameter used. These can be wound with known winding devices to wire coils, so-called coils and axially slide off the receiving part. In other cases where steel strips are used as the binding material, however, it may happen that the band windings in the winding device become jammed in such a way that their removal is not reliably possible. Such steel bands have e.g. a thickness of 2 mm and are made of steel, stainless steel or other resilient material. They have the tendency, after winding, so if the applied to the winding by the receiving part torsional moment is missing, elastically strong spring back to spring so again. This can lead to the binding material expanding so much outward after relieving that jamming occurs in the winding device.

In other cases, the binding material is not made of metal, but of plastic. Such binding material is used in most cases as a band, e.g. with a width between 10 and 20 mm, and a thickness of about 1 mm. Plastic tapes may e.g. braided or made by an extruder. Even made of plastic binder material may have a tendency to rewind after winding so far that an impairment of the bale unbinding can take place.

The invention is therefore based on the object to find a new winding device, with which it is possible not only wires, but also tapes that are used for strapping bales to reliably wind up and remove from the winding device again. In special versions also problematic plastic tapes should be removed.

This object is achieved by the features mentioned in claim 1.

In the device according to the invention, the outer surface of the receiving part and the inner contour of the pressing part cooperate in a particularly advantageous manner. Due to the angular shape The wound binding material can be particularly strong and thus plastically deformed at the corners. A processed in this way tape or wire coil no longer has a tendency to distractively after discharge. With this simple measure, it is also possible with binder materials, for example, tend to resume after winding, which occurs with resilient steel or certain plastics, possible to wind without special difficulties and then dispose of. A particular advantage of the subject invention lies in the fact that a distinction between bands and wires is not required, since this is a universally usable device. It is therefore not necessary to constantly check the incoming raw material bales on the type of binding material. It is understood that even with soft binding material, which in itself does not tend to resume after winding, a problem-free removal with the winding device according to the invention is still possible.

Fig. 1a-d

Prinzip und Wirkungsweise des Erfindungsgegenstandes beim Wickeln;

Fig. 2a-c

Prinzip und Wirkungsweise des Erfindungsgegenstandes beim Aufschneiden des Bandwinkels;

Fig. 3

eine Variante mit spitzen Eckenwinkeln;

Fig. 4

eine Variante der in Fig. 3 gezeigten Form mit speziellen Mitteln zur Erweiterung des Bindematerials;

Fig. 5

eine weitere Variante mit Mitteln zur Erwärmung.

The invention and its advantages will be explained with reference to schematic drawings. Showing:

Fig. 1a-d

Principle and mode of action of the subject invention during winding;

Fig. 2a-c

Principle and operation of the subject invention when cutting the band angle;

Fig. 3

a variant with sharp corner angles;

Fig. 4

a variant of the form shown in Figure 3 with special means for expanding the binding material.

Fig. 5

another variant with means for heating.

FIGS. 1a-1d show part of the winding device according to the invention and four important phases of its operation. The receiving part 2 is arranged with the winding surface 4 between two pressed parts 5 and 6. Not shown is the cutting of the binding material on the bale, loosening and lifting. Subsequently, the binding material is brought into the correct positions to the winding device. In the state shown in Fig. 1 a, the binding material 1 is already inserted into the receiving slot 3 of the receiving part 2. In this operating state, the two pressing parts 5 and 6 are located at a greater distance from the receiving part 2 and may possibly take over the function of a guide part for the binding material to be wound up. The Inner surfaces 7 of the pressing parts 5 and 6 each form a cheek angle β = 90 °, which is open to the receiving part 2 out. The ridge line 8 of the angle runs parallel to the axis of rotation 9. The perpendicular to the axis of rotation 9 on the winding surface 4 through the receiving part 2 cross-section here has the shape of a square with slightly rounded corners. The corner angle α is here 360 ° divided by 4 equal to 90 °. The rounding have, for example, a maximum radius of curvature of 10 mm, preferably a maximum of 1 mm. Depending on the main material to be processed strip material and a radius of curvature of about 0.1 mm may be particularly favorable. In the subsequent pressing process according to FIG. 1c, the two pressing parts 5 and 6 are moved and pressed in the direction of the receiving part 2, for which purpose, for example, serve hydraulic cylinders. Thereby, the tape roll 10 shown in Fig. 1b is formed into a tape roll 10 'having a shape approximate to the winding surface 4 of the receiving part 2. As already explained, this causes plastic deformation in the strip material in a particularly effective manner. After the pressing parts 5 and 6 have moved apart, the deformed tape roll can expand and be pushed axially downwardly from the receiving part as a relaxed tape roll 10 "For this purpose - as shown in FIGS 2 - an ejector 11 axially movable in the receiving part 2.

In Fig. 1 a, the angular position of the receiving part 2 is placed so that the strip material 1 can get past the pressing member 5 and 6 in the region of the receiving part. In Fig. 1c, however, the receiving part 2 is rotated so that the winding surface 4 and the inner surfaces 7 of the pressing parts 5 and 6 correspond approximately.

Figures 2a - 2c show an embodiment of the winding head according to the invention in three different functions, wherein the structural representation of the details has been omitted. The here arranged winding head with a rotatable receiving part 2 (axis of rotation 9) is provided at its winding area with the winding surface 4. The receiving part is drawn partially cut, so that the resting in its center ejection punch 11 and the associated ejector rod 12 are visible. In the winding area is the open at the end receiving slot 3, which serves to grip the binding material not shown here. An upper pressing part 5 and a lower pressing part 6 are positioned at a distance from the winding surface 4 which is at least so large that the formed tape roll 10 fits into the gap. It can be set to the maximum during the entire winding process to leave room for the winding at the end of the process or be constantly adapted to the growing winding while fulfilling a tape guiding function.

As shown in Fig. 2b shows, by compressing the two pressing parts in the direction of the receiving part 2 of the tape roll formed with the advantages already mentioned. After the two pressing parts 5 and 6 have moved apart again, the pressed tape roll is free, expands slightly and can be removed axially from the device as a relaxed tape roll 10 "by means of the ejector 11. For this purpose, the ejection rod 12 is moved toward the working end of the Shooting part moved.

A preferred embodiment of the subject invention under certain conditions is shown in FIG. 3. In this case, the corner angle α 'of the receiving part 2' deviating from the example of FIG. 1 is smaller than corresponds to the value 360 ° by number of corners. In the case shown here, it is not 90 but 45 °, although other values, in particular between 45 ° and 90 ° due to binder material-specific requirements are possible. Accordingly, the pressing parts 5 'and 6' are adapted to this contour, so they geometrically similar or equal. In the case shown here, the cheek angle β 'has a value which is 2 ° above that of the corner angle α'. Such an embodiment is particularly suitable for binding material which is made of plastic, since the angle produced during the winding process is sharper than e.g. 90 ° (at a square), whereby the tendency of the binding material to re-emerge, is further reduced.

Specifically, when the winding device according to the invention is to be used for plastic, heating can further improve its operation, which is shown in Fig. 4 in an example. Preferably, this heating can be realized by electrical heating wires 13 in the pressing parts 5 "and 6". But it is also possible to install heating wires 14 additionally or exclusively in the receiving part 2, 2 '. The heating of the strip material may also be by radiation or by friction, e.g. be created between the band and the pressed parts, if you can rotate the tape roll with slightly pressed pressed parts. The band should be brought to a temperature which is at least at the kinks 15 above the softening point of the plastic, usually between 80 ° C and 120 ° C.

The heating of the winding device can also be carried out in embodiments, as shown in Fig. 1. The most favorable embodiment depends on the requirements, where it may be quite important to construct a universally applicable winding device, ie a winding device that is suitable for both metal and plastic belts. As already mentioned, it is much easier in practical operation, if the same winding device can be used without changes even with different batches. If, for example, the winding device shown in FIG. 5 is provided with a heating in the pressed parts and / or in the receiving part, it is to be expected that it can easily process all the binding materials that occur. The arrangement of the heating wires or similar may be such that just at the kinks 15, the highest temperature is generated.

Claims (23)

1. A coiling device suitable for removing cut binding material (1), in particular metal bands, from bales, and consisting of
   at least one guide part for the binding material,
   a holder part (2, 2', 2") which has in its winding area a winding surface (4, 4') and a holder slot (3) to grasp the binding material (1), and which can be rotated relative to the guide part,
   and a device (11, 12) to push the wound-up binding material axially off the holder part,
   characterised in that
   the winding surface (4, 4') of the holder part (2) essentially has, in cross-section, the shape of a polygon, preferably a square, and
   the holder part (2, 2', 2") is surrounded, with a space in between, by at least two pressing parts (5, 5', 5", 6, 6', 6") which can be moved towards and away from the holder part (2, 2', 2") and
   the inside surface (7, 7') of the pressing part (5, 5', 5", 6, 6', 6") is geometrically similar or identical to a part of the winding surface (4, 4', 4") of the holder part (2, 2', 2").
2. Coiling device as in claim 1,
   characterised in that
   the inside surface (7, 7') of the pressing part (5, 5', 5", 6, 6', 6") is an angled surface with two sides that face towards the holder part, the ridge line (8) of which sides is parallel to the axis of rotation (9) of the holder part (2, 2', 2").
3. Coiling device as in claim 1 or 2,
   characterised in that
   the polygon that defines the winding surface (4, 4', 4") of the holder part (2, 2', 2") is equilateral.
4. Coiling device as in claim 2 and 3,
   characterised in that
   the face angle (β, β') of the winding surfaces (4, 4', 4") is the same as the corner angles (α, α') of the polygon with a tolerance of ± 10°.
5. Coiling device as in one of the previous claims,
   characterised in that
   the polygon that forms the cross-sectional shape of the winding surface (4, 4') is rounded off at the ends with a radius of curvature of a maximum of 10 mm, preferably a maximum of 1 mm.
6. Coiling device as in claim 5,
   characterised in that
   the radius of curvature is approximately 0.1 mm.
7. Coiling device as in one of the preceding claims,
   characterised in that
   the number of the corners of the polygon is not greater than 8, preferably not greater than 6.
8. Coiling device as in claim 7,
   characterised in that
   the number of the corners of the polygon is 4.
9. Coiling device as in claim 7 or 8,
   characterised in that
   the corner angles (α) of the polygon are equal to the figure of 360° divided by the number of corners.
10. Coiling device as in claim 7 or 8,
    characterised in that
    the corner angles (α') of the polygon are smaller than the figure of 360° divided by the number of corners, in particular approximately half as big.
11. Coiling device as in one of the preceding claims,
    characterised in that
    the axis of rotation (9) of the holder part is horizontal when in operation, with a maximum deviation of between -15° and +15°.
12. Coiling device as in one of the preceding claims,
    characterised in that
    the holder part (2, 2', 2") is powered to rotate in both directions.
13. Coiling device as in one of the preceding claims,
    characterised in that
    the pressing parts (5, 5', 5", 6, 6', 6") can be moved only towards and away from the holder part (2, 2').
14. Coiling device as in claim 13,
    characterised in that
    hydraulic cylinders are used to move the pressing parts (5, 5', 5", 6, 6', 6").
15. Coiling device as in one of the preceding claims,
    characterised in that
    there are exactly two pressing parts (5, 5', 5", 6, 6', 6") in one coiling device.
16. Coiling device as in one of the preceding claims,
    characterised in that
    it has an automatic run-off control to move the holder part (2, 2', 2") and the pressing parts (5, 5', 5", 6, 6', 6").
17. Coiling device as in one of the preceding claims,
    characterised in that
    means of heating the binding material are present.
18. Coiling device as in claim 17,
    characterised in that
    at least one pressing part (5", 6") can be heated.
19. Coiling device as in claim 17 or 18,
    characterised in that
    the winding surface (4") of the holder part (2") can be heated.
20. Coiling device as in claim 18 or 19,
    characterised in that
    the heating is effected by electricity.
21. Coiling device as in claim 18 or 19,
    characterised in that
    the heating is effected by radiation.
22. Coiling device as in claim 17 to 21,
    characterised in that
    the means of heating are used in such a way that the maximum temperature can be achieved at the bending points (15).
23. Use of the coiling device as in one of the preceding claims to remove bands from bales of recycled paper or cellulose in conjunction with a device for cutting the bands.

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