EP0093953B1 - Fibre baling press with a strapping device - Google Patents

Description

The invention relates to a device for tying pressed fiber bales with wire with a press ram and a counter pressure plate, with a relatively movable strapping carriage and with guide channels that surround the bale in the wrap plane on three surfaces, further with a wire feed device and with a device for connecting the wire ends.

A device of this type is disclosed in DE-A-1 942 278. For bandaging, a band is pushed around the bale, separated from the delivery roll, and the two ends are connected by clips. Instead of a band-shaped bandage, a wire can also be used. Such a device does not meet the conditions required in practice. Banded bandage is expensive and because of the sharp edges disadvantageous in the packaging of chemical fibers. In addition, the brackets are open on one side, so that the strength of the connection is unsatisfactory. Although wire is cheaper for bales made of man-made fibers, only twisting of the wire ends is known for connecting the wire ends. The resulting bending of the wires reduces the strength of the wire. In addition, the protruding ends of the drill connection give rise to injuries to the operator and also to the adjacent bales.

The invention is therefore based on the object of finding a device with which fiber bales with wire can be tied up permanently and automatically without the strength of the wire suffering from the connection.

Starting from the device of the type mentioned initially, this object is achieved according to the invention by a swivel arm arranged on the strapping carriage, which in the swung-in state applies the wire to the fourth surface of the bale, by a magazine for tubular seals arranged on the strapping carriage, into which the wire ends are inserted for sealing and by a seal pressing device.

The wire is preferably a non-directional, for example spring-hard steel wire and therefore has its nominal strength in the processed state. As a result of the sealing, the steel wire loses only a few percent of its maximum strength at the connection point, so that an optimal use of the strapping material is possible. The seal is a metal tube that is pressed by a pressing tool in such a way that it has several waves in the longitudinal direction. In this form, the seal can withstand a multiple of the loads that occur or it can be loaded up to above the tear limit of the steel wire used.

• Figur 1: eine zum Teil geschnittene Plombe mit zwei Drahtenden vor dem Verbinden,
• Figur 2: eine Seitenansicht der Plombe,
• Figur 3: eine Ansicht der Plombe gemäss Figur 2 von unten,
• Figur 4: einen umreiften Faserballen in perspektivischer Darstellung,
• Figur 5: eine Draufsicht auf eine Faserballenpresse mit einer Einrichtung zum Umreifen des Faserballens,
• Figur 6: eine zum Teil geschnittene Ansicht in Richtung des Pfeiles VI in Figur 5,
• Figur 7: eine zum Teil geschnittene Ansicht in Richtung des Pfeiles VII in Figur 5,
• Figur 8: eine Einzelheit im Schnitt sowie in grösserem Massstab,
• Figur 9: eine Einzelheit längs des Schnittes IX-IX in Figur 6 sowie in grösserem Massstab,
• Figur 10: Einzelheiten der Biegeeinrichtung in grösserem Massstab sowie zum Teil im Schnitt,
• Figur 11: einen Schnitt längs der Linie XI-XI in Figur 10 sowie in grösserem Massstab und
• Figur 12: eine Einzelheit der Figur 6 in grösserem Massstab.

The invention is described below with reference to an embodiment shown in the drawing. Show:

• FIG. 1: a partially cut seal with two wire ends before connection,
• FIG. 2: a side view of the seal,
• FIG. 3: a view of the seal according to FIG. 2 from below,
• FIG. 4: a strapped fiber bale in perspective,
• FIG. 5: a top view of a fiber baler with a device for strapping the fiber bale,
• FIG. 6: a partially sectioned view in the direction of arrow VI in FIG. 5,
• FIG. 7: a partially sectioned view in the direction of arrow VII in FIG. 5,
• FIG. 8: a detail on average and on a larger scale,
• FIG. 9: a detail along the section IX-IX in FIG. 6 and on a larger scale,
• FIG. 10: details of the bending device on a larger scale and partly in section,
• Figure 11: a section along the line XI-XI in Figure 10 and on a larger scale and
• Figure 12: a detail of Figure 6 on a larger scale.

A fiber bale 1 according to FIG. 4 is strapped in the longitudinal direction with steel wires 2 and in the transverse direction with steel wires 3, the ends 4, 5 (FIG. 1) of which are fastened to one another with a seal 6. The steel wires 2, 3 are non-directional, spring-hard steel. The seal 6 is a metal tube, as can be seen in Figure 1-3. In the initial state, the clear diameter of the metal tube is so large that the two ends 4 and 5 of the steel wires 2 and 3 can be easily inserted until they come out completely or almost again at the other end of the metal tube.

For sealing, the metal tube is pressed together and brought into a corrugated shape, about three to four elevations and depressions being formed over the length of the seal 6, as can be seen from FIGS. 2 and 3. Finally, FIG. 3 shows various pressure points 7 on the surface of the seal 6 which originate from a seal pressing tool.

The steel wires laid around the fiber bale 1 are expediently arranged in such a way that they form a braided layer. At least this is the case with steel wires 2 and 8 parallel to the edge, which is to prevent the steel wires 8 located near the fiber bale edges 9 and 10 from slipping.

As far as it is necessary to understand the invention, essential parts of the fiber baling press 11 and the device 12 for strapping the fiber bale 1 can be seen in FIGS. 5-12.

According to FIG. 5, a centrally arranged press ram 13 carries a press plate 14, which works together with a counter pressure plate 15 (FIGS. 6 and 7). The device 12 for strapping has a wire magazine or wire reel 16 for each steel wire 2 or 3 to be arranged in the longitudinal direction or transversely thereto on the fiber bale 1 (and correspondingly for the steel wires 8, but not shown), a wire feed device 17, a cutting device 18, a swivel device 19 with a bending device 20, and guide means 21 and finally a holding and closing device 22 for the still uncut steel wire 2a or 3a coming from the wire reel.

The parts 16-21 for the steel wires 3a are in the embodiment shown in FIGS. 5 and 6 on a carrier or carriage 23 which, in the working position and top view according to FIG. 5, surrounds the press plate 14 with the fiber bale 1 in a U-shape. The carrier 23 is movable so that the fiber bale 1 is accessible after strapping and can be removed from the fiber baler 11.

The parts 16-20 for the steel wires 2a are located on a carrier or carriage 24 (FIGS. 5, 7) which can also be moved to and from the fiber baling press 11.

The guide means 21 for the steel wires 2a and 3a are located on the carrier or carriage 23, as can be seen from FIGS. 5 and 7.

The function and mode of operation of the fiber baler 11 with the strapping device 12 is identical for the steel wires 2a or 3a and 8 and includes in detail the following measures, which are first explained with reference to FIGS. 6 and 7. The wire feed device 17 with its driven pulling and tensioning rollers 25 pulls the steel wire 2a from the roller 16 and pushes it through the cutting device 18 with the two knives 26, 27, from where the steel wire 2a reaches the bending device 20. From there, the steel wire 2a moves during threading through guide elements 28 and 29 with funnel-shaped inlets 30 to a guide channel 31 in the counterpressure plate 15 and from there through the guide means 21 to the press plate 14. This also has a guide channel 32 or guide means for each steel wire 2a with funnel-shaped inlet and the holding and closing devices 22. After inserting the steel wire 2a, these grip and hold one end 5, whereupon the pulling and tensioning rollers 25 of the feed device 17 run backwards and thereby firmly place the steel wire 2a against the fiber bale 1. This is done with all steel wires 2a, 3a and 8, which are inserted into the guide channels 31 and 32 and captured by the holding and closing devices 22. During tensioning, the steel wire 2a, 3a slides out of the guide channels 31, 32, as well as out of the guide means 21, it rests on three of the surfaces of the bale and is also gripped by the bending device 20 and by the knives 26, 27 of the cutting Setup cut off. The cutting is done after tensioning the steel wire 2a or 3a.

The steel wire 2a, 3a not only changes its position in the area of the three surfaces of the fiber bale 1 during tensioning, but also on the fourth bale surface, following its edge 33 and the next pulling and tensioning rollers 25 facing it, as can be seen in FIG in Figure 6 partially shown dash-dotted position. In order to be able to compensate for this first change in position, the cutting device 18 is pivotably mounted about an axis 34 at the level of the axes of the adjacent pulling and tensioning rollers 25 (FIG. 6). About an axis coinciding with the edge 33 of the fiber bale 1, the pivoting device 19 can also be pivoted with the aid of a drive 35 on the fiber bale 1 to the fourth bale surface for a second change of position. It comprises a bent swivel arm 36 with the bending device 20, which is mounted eccentrically at its free end 37 and can be pivoted by a drive 38. The bending device 20 grasps the steel wire 3a (FIG. 6) after tensioning and before cutting, and bends up its free end 4 the fiber bale 1, whereupon a metal tube serving as a seal 6 is released by a magazine 51 and slides over the free end 4 of the steel wire 3a. The magazine 51 can be moved out of the movement path of the bending device 20 with the aid of a drive 52. As soon as this has been done, the pivoting device 19 pivots the steel wire 3a, which is still tensioned, until its end 4 engages in the holding and closing device 22 in the press plate 14, as indicated in broken lines in FIG. There, the metal tube 6 is threaded onto the other end 5 of the steel wire 3a and is finally deformed into a seal 6 with the aid of a pressing tool 53, as can be seen from FIGS. 9 and 12 and the associated text. The wire rolls 16, like the cutting device 18 and the swivel device 19, are mounted on stands 39 and 40, respectively, which are located on the carriers or carriages 23, 24.

FIG. 8 shows, on a larger scale, two intersecting guide channels 41 and 42 in the press plate 14 for steel wires 2, 3 and 8 which intersect and lie in different planes. The guide channels 41 and 42 essentially correspond to the guide channels 31, 32 in FIG. 7.

In each of the guide channels 41, 42 there are interrupted, possibly multi-part inserts 43 in the region of the other guide channel as guide means for the steel wires 2, 3 and 8.

These inserts 43 or guide means are in each case two mutually abutting guide rails or guide strips 44, each with an approximately semicircular shape and an edge 45 which is bent toward one another. The edges 45 form tubular half-shells and serve as a channel 46 for the steel wire 2. The in other guide channels 41 and 42 and steel wires 3 and 8 located in other planes likewise lie between the semicircularly curved edges of corresponding guide strips 44, as can be seen in principle from FIG.

The guide strips 44 are fastened in the intersecting guide channels 41, 42 with the aid of bolts 47 which pass through openings in the guide strips 44. Furthermore, associated guide strips 44 are pressed against one another by springs 48, 49 supported on the bolts 47. The bolt or bolts are in turn at angles 50 attached with legs of different lengths, if necessary, so that such an angle can possibly carry bolts 47 and guide strips 44 in two different planes.

As soon as a strong pull is exerted on the steel wire or wires 2, 3 and 8, the wires open against the force of the springs 48, 49 the half-shell-shaped edges 45 of the guide strips 44 which serve as claws and emerge from them until they come into direct contact the fiber bale. The ends or inlets 54 of the tubular edges 45 of the guide strips 44 are funnel-shaped, so that the free end of the steel wire finds its way automatically when it is pushed forward.

FIG. 9 shows, in section, further structural components inside the press plate 14 or in its guide channels 41, 42 in the plane of the steel wires 3. These are the holding and closing device 22 and the press tool 53 according to FIG. 6, as well as parts the bending device 20.

Both the bending device 20 and the holding and closing device 22 have a plurality of disks 56 which can be pivoted about an axis 55, as shown in FIG. 11, in order to hold the piece of wire adjacent to the wire end 4 or 5. Each of these disks 56 of the same design is pivoted freely on the common axis 55 and has a bore 57 through which a camshaft 58 with one cam 59 engages for each disk 56. On the circumference of each disc 56 there is also a recess 60 such that a steel wire 3 lying in this recess is clamped when the discs 56 are pivoted from a congruent position into a position that is no longer congruent between the edges of adjacent recesses 60 serving as clamping jaws 61 .

The pivoting of the disks 56 takes place with the aid of the camshaft 58. The steel wire 3 is released by pivoting the clamping disks 56 back into the congruent position, as a result of which all the recesses 60 also lie one above the other and their edges can no longer hold the wire 3.

In the bending device 20, according to FIG. 10, the camshaft 58 is driven with the aid of a double-acting piston-cylinder device 62 and a lever 63. The bending device 20 has an axis 55, a camshaft 58, for the clamping disks 56 of each steel wire 3 and a lever 63, which are mounted, for example, on a support 64 in the form of a square tube.

According to FIG. 12, the clamping disks 56 of the holding and closing device 22 (FIG. 9) sit on an axis 55 which is mounted in a U-shaped carrier 65. The camshaft 58 is also mounted in this carrier 65 and is driven by means of a pinion 66 and a rack 67 by a pneumatically or hydraulically operating piston-cylinder device 68. During a working stroke, the piston-cylinder device 68 pivots the clamping disks into the holding position and moves them back into the release position on the return stroke.

FIGS. 9 and 12 finally show the pressing tool or tools 53 for closing the seals 6. Each pressing tool 53 has a fixed jaw 69 and a jaw 71 which can be moved by means of a piston-cylinder drive 70. The pressing tools 53 become effective as soon as the one wire end 4 with the metal tube serving as the seal 6 has been pivoted into the guide channel 41 by the swivel device 19 and the bending device 20 and the other wire end 5 has likewise entered the metal tube 6. After the sealing, the clamping disks 56 of the bending device 20 and the holding and closing device 22 are opened, so that the steel wires 2, 3 and 8 can emerge from the guide channels 31 and 32 or 41, 42.

As shown above all in FIG. 10, the bending device 20 is pivotally mounted eccentrically on one end 72 of the swivel arm 36. The bending device 20 therefore not only pivots about the bearing axis 73, but also moves along an arc (see dash-dotted line) at a distance a around the bearing axis 73. This measure is expedient so that the steel wires 2, 3 and 8 Apply to the fiber bale 1 in the desired manner, as well as taut.

The invention is not limited to the specific embodiment shown in the figures, but many other modifications can be made without deviating from the basic idea of the invention. For example, it is possible to arrange the holding and closing device 22 and / or the pressing tool 53 not in the interior of guide channels 41, 42 of the pressing plate 14 that are open on the bale side, but at any other point, and then to place these components on or to fix the carriage or carriers 23, 24.

Finally, it would also be possible to achieve the eccentric movement of the bending device 20, the measures required for this, e.g. to provide a crankshaft bearing at the lower end of the swivel arm 36. It is only essential that the clamping device consisting of several components even has an eccentrically pivotable clamping element.

Claims (5)

1. Apparatus for tying-up compressed fibre bales (1) with wire (2, 3, 8), having a press punch (13) and a counterpressure plate (15), a wrapping truck (24) which is displaceable relative thereto and guide channels (31, 21, 32) which surround the bale (1) in the looping plane on three faces, additionally having a wire feeding means (17) and a means for joining the wire ends (4, 5), characterised by a pivot arm (36) which is disposed on the wrapping truck (23, 24) and, in its inwardly pivoted position, places the wire (2, 3, 8) on the fourth face of the bale, by a magazine (51) which is disposed on the wrapping truck (24) for tubular- like lead seals (6), into which the wire ends (4, 5) can be inserted for lead-sealing purposes, and by a lead seal pressing device (53).

2. Apparatus according to claim 1, characterised in that the lead seal pressing device is disposed on the wrapping truck.

3. Apparatus according to claim 1, characterised in that the lead seal pressing device (53) is disposed in one of the pressure plates (14, 15).

4. Apparatus according to claim 3, characterised in that the lead seal pressing device (53) is disposed in the upper pressure plate (14).

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