WO1996008414A1

WO1996008414A1 - Method and device for twisting binding wire

Info

Publication number: WO1996008414A1
Application number: PCT/DE1995/001165
Authority: WO
Inventors: Heiko Meck; Stefan Berger
Original assignee: Sket Schwermaschinenbau Magdeburg Gmbh
Priority date: 1994-09-15
Filing date: 1995-08-17
Publication date: 1996-03-21
Also published as: DE4434377A1

Abstract

The invention concerns a method and device for twisting binding wire, the device comprising a longitudinally moving twisting head fitted to a machine for winding the wire round a bundle. The aim of the invention is to ensure, even with frequent changes in bundle shape, a consistently short and tightly twisted length of wire without the need to reset the operating parameters of the machine. This is achieved by virtue of the fact that, irrespective of the shape of the bundle (1), the twisting head (13) is brought up to the bundle (1) into a predetermined starting position and moved away from the bundle in the longitudinal direction, executing a predetermined number of rotations in order to twist the crossed ends of the wire (2). The leading end of the wire (2) is then released and the trailing end cut off the continuously running wire (2), the free ends being further twisted and the twisting head (13) subsequently being moved back in the opposite direction, i.e. towards the bundle, into its starting position. The untwisted extremities of the ends of the wire (2) are then pushed by a pressing element in towards the bundle (1) and up against the side of the twisted section of wire.

Description

Method and device for twisting binding wire

The invention relates to a method and a device for twisting binding wire with an axially displaceable twisting head on a wire binding machine for binding a bundle, in particular a stack, package or bundle of shaped steel in a rolling mill, the continuing of the twisting head. From this end, the binding wire supplied is laid around the bundle, returned to it and tightened, the two end sections of the binding wire being crossed in the drilling head and the front end of the binding wire being clamped in the drilling head.

It is known to use wire binding machines with a knot or weld closure for the strapping of bundles in all its forms, in particular in a rolling mill. A knot closure is the twisting of the wire ends of a binding wire placed around the bundle.

With the known methods, relatively long twists with protruding wire ends are produced, some of which are pressed against the binding material after the twisting.

In the known methods and devices for twisting, different bundle shapes and thus variable wire lengths often lead to differently tight bonds and also to the breaking of the knot connection, since a fixed wire length between the bundle and the device results in a defined wire length for optimal training the twist is required.

From DE 40 35 094 AI a device for twisting binding wire for a wire binding machine with an axially displaceable twisting head, a clamping device and a cutting bushing is known. Here, the twisting of the binding wire is carried out with a twisting head with intersecting bores and grooves for guiding the binding wire. During the twisting, the twisting head is displaced axially in the direction of the binding material and forms the twisting. Then load the drill head moves back into the starting position, the wire ends being pulled out of the drill head. In this way, the "twistable wire length", which is different depending on the geometry of the binding material, is twisted and is present in front of the drilling head until the binding material is completely tightened. It is therefore necessary to precisely set and control the number of drill revolutions using timing elements. The fluctuations that occur in the twistable wire length cannot be compensated for and have an effect on the quality of the bonds. The twists have relatively large lengths and fluctuate with the number of twist revolutions, with the wire ends untwisted in the twisting head protruding.

From EP 0 414 599 AI a method for twisting is known in which the twisting head does not perform any axial relative movement and twists the twistable wire lengths present in front of the twisting head, which likewise results in the disadvantages described above.

Another known method for twisting is in the

DE 33 08 244 C described. It provides for a movement of the drill head, but only for prepositioning it at the shortest distance from the bundle. However, since the final twisting is carried out with clamped wire ends when the twisting head is firmly positioned in relation to the bundle, this method also depends on the twistable wire lengths present and has the disadvantages described above. The remaining wire ends are then pressed onto the binding material approximately at an angle of 90 °, whereby a hooking of these wire ends during transport cannot be ruled out.

The invention is based on the object of a method and a device for twisting binding wire with an axially displaceable twisting head on a wire binding machine for binding a bundle, in particular a stack, package or bundle of shaped steel in a rolling mill, the head continuously fed binding wire from this around the bundle, returned to this and tightened and thereby the two end sections of the binding wire are crossed in the drill head and the front end of the binding wire is clamped in the drill head to create what Even with frequently changing forms of the bundle, constant, short and tight twisting is achieved without changing the machine parameters.

According to the invention, the object is achieved in that, independently of the shape of the bundle, the drill head is brought into an identical starting position with respect to the bundle and is moved by the latter with a predetermined number of rotations in order to twist the crossed end sections of the binding wire in the axial direction, the front end of the binding wire released and its rear end from the continuous

Binding wire is separated and the free end sections are further twisted and then the twisting head is axially displaced in the opposite direction to its starting position to the bundle, the untwisted ends of the binding wire being pressed laterally with a pressing element in the direction of the bundle the twist is applied.

The number of revolutions of the twisting head for twisting the binding wire is preferably entered into a rotary encoder as a setpoint and is controlled and monitored by the latter.

In order to achieve a safe twisting of the binding wire, it is expedient that the crossed end sections of the binding wire are connected to form a self-locking twist and then the front end of the binding wire is released and its rear end is cut off.

It is advantageous if the untwisted ends of the binding wire are applied to the twist by means of a pressure sleeve connected to the twisting head on its side facing the bundle and displaceable in the axial direction by the Pushing the pressure sleeve axially beyond the starting position of the drill head towards the bundle in the direction of the bundle over the twist and the untwisted ends, the pressure sleeve being pulled back axially in the direction of the drill head after the untwisted ends have been applied until it has reached its starting position and the twist is released.

The solution according to the invention ensures that a defined distance between the drill head and the bundle and a defined release of the end sections of the binding wire are mainly used to form a "drill knot", a short "drill knot" with relatively short protruding ends is achieved and thus not only the "twistable length" available in front of the twisting head and deliberately kept short is used up, but also, apart from the very short ends still present, which are still to be applied to the twisting which are in the twisting head and its End sections existing intersecting guideways are used.

Due to the approximately identical geometric initial conditions and the constant machine parameters, good reproducibility is possible for all bundle shapes.

A “twist knot” is understood here to mean the twisting of the binding wire.

In a further embodiment, the invention comprises a device, the bundle resting against a spacer supported on a housing, the drill head being arranged in a predetermined starting position with respect to the bundle, and rotatable about its longitudinal axis by the latter for twisting the binding wire into one , a larger distance from the bundle, the end position is axially displaceable, the drill head being assigned a drill drive provided with a rotary encoder with sensor and the drill head being equipped with a cutting device device for the continuous binding wire and a clamping device for the front end of the binding wire is connected and wherein a pressing element for placing the untwisted ends of the binding wire on the twist in the direction of the bundle is arranged on the twisting head.

In order to achieve a constant twisting, it is expedient if the twisting head is arranged on the side facing the bundle on a twisting shaft which is connected via a gear stage to the rotary drive provided with a rotary encoder with a sensor and at the one in the area of its rear end Drive is arranged, which moves the drill head in the region of its starting and end positions in both directions via the drilling shaft.

To securely place the untwisted ends against the twist, it is advantageous if the pressure element is designed as a cylindrical pressure sleeve, the pressure sleeve being arranged to be axially movable in the drilling head and being displaceable toward the bundle via its starting position.

It is possible that a pressure drive is arranged on the housing, by means of which the cylindrical pressure sleeve can be actuated by means of a pressure lever and a bayonet lock and an axially displaceable pressure pin arranged in the twist shaft.

The cutting device for the continuous binding wire can be designed in such a way that the drill head is rotatably mounted in a cutting bush fixedly connected to the housing and a knife is arranged on the drilling head, the continuous binding wire being fixed in its position by the cutting bush and at a certain angle of rotation the knife is separable.

For attaching and detaching the front end of the binding wire it is expedient that a clamping piece is arranged on the lower part of the cutting bush, which is assigned a clamping lever which can be actuated by a clamping drive.

The invention is explained in more detail using an exemplary embodiment. In the accompanying drawing:

Fig. 1 is a front view of the device for twisting

Tie wire,

2 shows the view A according to FIG. 1 in an enlarged view, FIG. 3 shows the view B according to FIG. 2,

Fig. 4 is a front view of part of the device according to Fig. 1 with a drill head in four working positions.

Fig. 7

The method for twisting a binding wire 2 is carried out with an axially displaceable twisting head 13, as shown in the figures. It can be used for bundle 1 with different shapes and dimensions, in particular for stacks, packages or bundles of shaped steel in a rolling mill. It is not necessary to change the machine parameters here.

Different bundles 1 are shown on the left in FIG. 1, in which the binding wire 2 placed around them can be twisted in the same way. Here the

Drill head 13 continuously fed binding wire 2 from these in a manner known per se around bundle 1 and fed back to drill head 13. The two end sections of the binding wire 2 are crossed in the drill head 13, which has corresponding guides. The front end of the binding wire 2 is held in the drill head 13 with a clamping device shown in FIGS. 2 and 3. The subsequent tightening of the binding wire 2 around the bundle 1 is carried out by a driver, not shown. Irrespective of the shape of the bundle 1, the drill head 13 assumes an identical starting position with respect to it. Serve for this, as in FIGS. 1 and 2 shown, spacers 25 arranged laterally next to the drill head 13 on a housing 3 of the device. The end sections of the binding wire 2, which are twisted together, are therefore always of the same length. The spacers 25 also prevent damage to the twisting device by the bundle 1.

4 to 7, the individual working positions of the drill head 13 are shown during the twisting.

4 shows that the drill head 13 rotates about its longitudinal axis and begins to twist the binding wire 2 placed around the bundle 1. The crossed end sections of the binding wire 2 are connected to form a self-locking twist. Thereafter, the front end of the binding wire 2 is released and its rear end is separated from the continuous binding wire 2. Simultaneously with the rotary movement, as shown in FIGS. 4 and 5, the drill head 13 is moved away from the bundle 1 in the axial direction. The intended inclination of the twist or the "drill knot" results from the simultaneous rotation and locomotion. After the release or separation of the ends of the binding wire 2, the free end sections are further twisted. The number of revolutions of the twisting head 13 for twisting the binding wire 2 are entered in a rotary encoder 7 (FIG. 1) as a setpoint and are controlled and monitored by the latter.

5 shows the working stage at which the twisting head 13 has released the twisting of the binding wire 2. It is in its rear end position. With the method it is possible to achieve an optimal, short twist in all forms of bundle 1.

The axial movement of the drill head 13 is now reversed and it moves in the direction of the bundle 1 into its starting position. The untwisted ends of the Binding wire 2 with a pressure element in the direction of the bundle 1 applied laterally to the twist. The corresponding working position is shown in FIGS. 6 and 7.

The pressing element can be a pressure sleeve 15 connected to the drill head 13 on its side facing the bundle 1 and axially displaceable relative thereto. The pressure sleeve 15 is, as shown in FIG. 6, pushed beyond the starting position of the drill head 13 to the bundle 1, axially in the direction of the bundle 1 over the twisting and the undistorted ends. A close contact of the ends in the direction of bundle 1 with the twist is thereby achieved.

After the untwisted ends have been applied, the pressure sleeve 15 is withdrawn axially in the direction of the twisting head 13 until it reaches its starting position and the completed twisting is released, as shown in FIG. 7.

1 to 3 show a device which is particularly suitable for carrying out the method. The device for twisting binding wire on a wire binding machine is designed as a complete assembly, apart from means for controlling the hydraulics and the electrical system and for feeding the binding wire 2 and its tightening. It has a housing 3 with a gear stage 4, driven by a drill drive 6, which in turn is connected to the rotary encoder 7 and to which a sensor 5 is assigned. The gear stage 4 transmits the torque directly to an axially displaceable twist shaft 8. On the twist shaft 8, the twist head 13 is fixedly arranged on the side facing the bundle 1. The drill head 13 has a knife 14 (FIG. 2). In the drill head 13, the cylindrical pressure sleeve 15, which is displaceable toward the bundle 1 over the starting position thereof, is arranged so as to be axially movable. For their actuation, a pressure pin 16 and a bayonet lock 18 are connected to the drill shaft 8.

The drill head 13 is rotatable in a fixed manner with the housing 3 connected cutting bushing 20 arranged. A clamping piece 21 is fastened to the cutting bushing 20. This is assigned a pivotable clamping lever 22 with a stop, actuated by a clamping drive 23, as shown in more detail in FIG. 3.

The spacers 25 are arranged laterally next to the cutting bush 20. For the exact feeding of the binding wire 2 to the drill head 13 there is also a guide channel 24 on the housing

3 arranged. In the drill head 13, as indicated in FIG. 1, intersecting guides for the binding wire 2 are provided.

A bracket 10 attached to the rear of the housing 3 accommodates the preferably hydraulically actuated drive 12 for the longitudinally displaceable twist shaft 8 and secures an intermediate bearing 9 against rotation. A sensor 11 monitors the end position of the drill shaft 8 and thus of the drill head 13. A pressure lever 17 is pivotally mounted on the axial bearing housing 9 and is actuated by a preferably hydraulically actuated pressure drive 19.

When carrying out the above-described method with the device, the front end of the binding wire 2 is guided through the drill head 13 until the clamping lever 22 stops, in order to hold it with the clamping device. Then it is pressed by the clamping lever 22 and the clamping drive 23 to the clamping piece 21. After tightening the binding wire 2 around the bundle 1, the drill drive 6 drives via the gear stage

4 and the drill shaft 8 on the drill head 13, whereby this rotates about its longitudinal axis. This results in the self-retaining twist and then the tight binding wire 2 is cut off by the knife 14 on the cutting bushing 20 at a certain angle of rotation. In the moment of the cutting of the binding wire 2 detected by the rotary encoder 7, the clamping drive 23 releases the clamping lever 22 and releases the front end of the binding wire 2. Simultaneously with the rotary movement of the drill head 13, the drive shaft 8 and thus the drill head 13 are moved away from the bundle 1 by the drive 12. Through the Simultaneous rotation and axial movement of the drill head 13, as already described at the beginning, the twist maintains the predetermined gradient, the number of revolutions being predetermined by the rotary encoder 7. At the same time, the reaching of the end position in the axial direction is monitored by the sensor 11.

As described above, the undrilled ends of the binding wire 2 which are still present are closely applied to the twist by the pressure sleeve 15. For this purpose, the pressure lever 17 is actuated by means of the pressure drive 19 and the pressure sleeve 15 is moved out of the drill head 13 via the bayonet lock 18 and the pressure bolt 16 in the twist shaft 8. As a result of the subsequent axial movement of the twist shaft 8 by means of the drive 12 towards the bundle 1, the wire ends are gripped by the pressure sleeve 15 and put over the twist.

With the retraction of the pressure sleeve 15 into the drilling head 13 and the reaching of the starting position of the drilling shaft 8, which is monitored by the sensor 5, all drives correspond to the basic position, and a new binding and thus twisting process can be initiated.

Claims

claims

1. A method for twisting binding wire with an axiaJ displaceable twisting head on a wire binding machine for binding a bundle, in particular a stack, package or bundle of shaped steel in a rolling mill, with the binding wire continuously fed to the twisting head from there around the bundle to the latter is returned and tightened and the two end sections of the binding wire are crossed in the drilling head and the front end of the binding wire is held in the drilling head, characterized in that, regardless of the shape of the bundle (1), the drilling head (13) is in one the same starting position is brought to the bundle (1) and is moved by it in the axial direction with a predetermined number of revolutions for twisting the crossed end sections of the binding wire (2), the front end of the binding wire (2) being released and released rear end of the continuous binding wire (2) is separated and the free end are further twisted and then the twisting head (13) is axially displaced in the opposite direction into its starting position to the bundle (1), the untwisted ends of the binding wire (2) with a pressing element in the direction of the bundle ( l) be applied laterally to the twist.

2. The method according to claim 1, characterized in that the number of revolutions of the twisting head (13) for twisting the binding wire (2) in a rotary encoder (7) is entered as a setpoint and controlled and monitored by this.

3. The method according to claim 1, characterized in that the crossed end portions of the binding wire (2) are connected to a self-locking twist and then the front end of the binding wire (2) is released and its rear end is separated.

4. The method according to claim 1, characterized in that by a with the drill head (13) on its side facing the bundle (1) and in the axial direction displaceable to this pressure sleeve (15) the untwisted ends of the binding wire (2) to the Twisting can be created by pushing the pressure sleeve (15) beyond the initial position of the drilling head (13) to the bundle (1), axially in the direction of the bundle (1) over the twisting and the untwisted ends, after the application the untwisted ends, the pressure sleeve (15) is withdrawn axially in the direction of the twisting head (13) until it reaches its starting position and the twisting is released.

5. Device for twisting binding wire with an axially displaceable twisting head on a wire binding machine for binding a bundle, in particular a stack, package or bundle of shaped steel in a rolling mill, with the binding wire continuously fed to the twisting head from around the bundle, to the latter is returned and tightened and the two end sections in the

Drill head are crossed and the front end of the binding wire is held in the drill head for carrying out the method according to claims 1 to 4, characterized in that the bundle (1) is attached to a housing (3 ) supporting spacer (25), wherein the drill head (13) is arranged in a predetermined starting position with respect to the bundle (1), and from this for twisting the binding wire (2) about its longitudinal axis rotatable into a larger distance the bundle (l), the end position is axially displaceable, the

Drill head (13) is assigned a drill drive (6) provided with a rotary encoder (7) with sensor (5) and the drill head (13) with a cutting device for the continuous binding wire (2) and a clamping device for the front end of the Binding wire (2) is connected and on the drill head (13) a pressing element for Applying the untwisted ends of the binding wire (2) to the twist in the direction of the bundle (1) is arranged.

6. The device according to claim 5, characterized in that the drill head (13) on the bundle (1) facing

Side is arranged on a twist shaft (8), which is connected via a gear stage (4) to the twist drive (6), which is provided with a rotary encoder (7) with sensor (5), and on which a connection in the area of its rear end Drive (12) is arranged, which moves the drill head (13) in the region of its starting and end positions in both directions via the drilling shaft (8).

7. The device according to claim 5 and 6, characterized in that the pressing element as a cylindrical pressure sleeve

(15) is formed, the pressure sleeve (15) being axially movable in the drill head (13) and being displaceable toward the bundle (1) via its starting position.

8. Apparatus according to claim 6 and 7, characterized in that a pressure drive (19) is arranged on the housing (3) through which via a pressure lever (17) and a Bajo¬ nice closure (18) and one in the twist shaft (8th ) arranged and axially displaceable pressure pin (16), the cylindrical pressure sleeve (15) can be actuated.

9. The device according to claim 5, characterized in that the drill head (13) rotatably mounted in a fixed to the housing (3) connected cutting bush (20) and on the drill head (13) a knife (14) is arranged, the continuous The binding wire (2) is fixed in its position by the cutting bushing (20) and can be separated by the knife (14) at a certain angle of rotation.

10. The device according to claim 5 and 9, characterized gekennzeich¬ net that at the lower part of the cutting bush (20) Clamping piece (21) is arranged, to which is assigned a clamping lever (22) which can be actuated by a clamping drive (23) for fastening and releasing the front end of the binding wire (2).