WO2019238586A1

WO2019238586A1 - Separating device for strapping bands

Info

Publication number: WO2019238586A1
Application number: PCT/EP2019/065037
Authority: WO
Inventors: Martin Czaja; Christian Nölke
Original assignee: Titan Umreifungstechnik Gmbh & Co. Kg
Priority date: 2018-06-12
Filing date: 2019-06-07
Publication date: 2019-12-19
Also published as: CA3103036A1; EP3581508B1; ES2850724T3; EP3581508A1; CA3103036C

Abstract

The present invention relates to a separating device for strapping bands (1). The separating device has a movable pressing element (4), a foot (2) having a thrust edge (3) for the strapping band (1), which can be fixed between the foot (2) and the pressing element (4), and a cutting blade (5) for severing the fixed strapping band (1). According to the invention, the pressing element (4) is designed as a punch (4), which penetrates the strapping band (1) at least in part.

Description

Cutting device for strapping

Description:

The invention relates to a separating device for strapping, with a movable pressing element, further with a foot with a push edge for the strapping that can be fixed between the foot and the pressing element, and with a cutting blade for severing the fixed strapping.

Cutting devices for strapping tapes are used in many ways to make strapped material accessible. In the simplest case, such separating devices can be a pair of scissors that have a movable and a fixed blade. In addition, a clamp is usually provided to hold the strip that has been cut off. This is necessary insofar as such severed strips often “spring open” at considerable speed and can thereby cause damage or, in the worst case, even injuries to operating personnel. Typical examples of such devices for severing a strip from strapping are described in EP 1 495 978 B1.

In the generic state of the art according to EP 3 013 538 B1, a battery-operated belt cutting device is used. This has a pressure device that can be moved in contact with the strapping. In this way, the band can be fixed against a foot. While the pressing device fixes the tape, an additional cutting blade cuts the tape on a push edge. This has generally proven itself. In addition, the state of the art according to US Pat. No. 8,160,748 B2 describes the possibility of moving such a separating device with the aid of a three-dimensional robotic arm. To the

To position the separating device, a tape detection device is additionally provided. This is a camera in the present case.

However, the known separating devices for strapping are associated with the disadvantage that, in particular, steel straps with a large material thickness, such as are used, for example, when wrapping and holding metal strip coils together, can practically not be cut or cannot be ensured with such strapping that the end cut off does not spring open in an uncontrolled manner despite the provided clamping devices.

This is because the known clamping devices ultimately ensure that the steel strips in question are held, for example with the aid of friction surfaces, as are used in the further prior art according to WO 2008/052175 A1. However, such friction surfaces fail in the field of application described because, for example, steel strips for strapping metal strip coils can have prestresses of 40 to 50 kN or even more. Such pre-tensioned belts can practically not be mastered with conventional clamping devices, so that the previously known separating devices fail in the field of use described. The invention as a whole aims to remedy this.

The invention is based on the technical problem of providing such a separating device for strapping tapes, which reliably and reliably prevents the severed strapping from popping open and securely holds the severed end of the strapping tape.

To solve this technical problem is a generic separating device for strapping within the scope of the invention

characterized in that the pressing element is designed as a punch which at least partially penetrates into the strapping band.

In the context of the invention, in contrast to the prior art according to EP 3 013 538 B1, the pressure element therefore not only ensures that the strapping is fixed between the foot and the pressure element. Rather, the pressure element, as a punch, penetrates more or less into the strapping band, thereby ensuring a pronounced punching in the strapping band. By means of this punching and a punched piece produced by the punch in the strapping, the severed end of the strapping is practically not held in place by frictional forces. Rather, the punch completely or partially penetrating into the strapping band ensures that the severed end of the strapping band is held in the manner of a claw by means of the punch. In this way, it is also possible to control the pre-stresses previously mentioned in such strapping tapes in the strapped state, which are values of 50 kN and even more. This is expressly not possible with the separation devices that have been made available up to now. In fact, the separating device for strapping according to the invention opens up the option of being able to cut thick and high-strength strapping (made of steel) for the first time. Such so-called high-performance tapes have tensile strengths of 1,200 N and more, for example. In addition, breaking loads of more than 50,000 N or 50 kN and even up to 57 kN are observed for such high-performance strips, which are consequently equipped with material thicknesses of, for example, 1.4 mm and more, which are increased compared to conventional steel strips. The use of high-strength steel also places special demands on separating devices that are not met by the separating devices known in the prior art

are, however, can be cut properly and safely for the first time using the solution according to the invention.

According to an advantageous embodiment, the design is further such that the foot has a receptacle for the punch. As a result, when punched into the strapping band, the punch as a whole can form the previously mentioned die-cut, which, either alone or together with the punch, evades into the receptacle in the foot when it is formed. At the same time, the receptacle, together with the punch and also the punched piece immersed in the receptacle, can provide an additional hold for the severed end of the strapping. This reliably prevents the severed strapping and, in particular, steel strapping from popping open, thereby reliably preventing any damage or even health hazards to operating personnel.

The punch can have very different shapes and cross-sectional configurations. As a rule, the punch is polygonal in cross section. Trapezoidal, square, hexagonal, octagonal or other polygonal shapes can be implemented and implemented here. It is also conceivable to design the punch as oval or round in cross section. In principle, combinations are also conceivable.

A design of the punch which has a triangular cross-section has proven to be particularly advantageous. This allows any expansion forces of the strapping to be severed to be absorbed particularly well. In fact, such expansion forces generally act along the axis of symmetry of the triangle in question and are thus transmitted through the respective legs of the

Triangle evenly introduced into the punch, which in turn is not excessively stressed in this way.

The punch also has a nose protruding in the pressing direction and an adjoining shoulder. Because the nose of the punch protrudes, it ensures that the nose penetrates the strapping and can also penetrate. As a rule, the nose is located at the tip of the strapping which is triangular in cross section, so that the tip can penetrate the strapping particularly easily and effectively and, as it were, cut through in the area of the tip. At the same time, the stop shoulder adjoining the projecting nose ensures that the diecut formed in this way is bent in the strapping band against a band surface. This means that the diecut is still connected to the strapping on its base side opposite the tip of the triangle. As a result, the base of the triangular diecut can be bent with respect to the belt surface, with the help of the stop shoulder. The punched piece formed in this way is thus, overall, triangular in shape following the shape of the punch and connected to the strapping with the base of the triangle. At the same time, the diecut is bent towards the surface of the tape and is thus more or less immersed in the receptacle in the foot. In any case, the punch, the punch and the receptacle in the foot, taken together, ensure that the severed end of the strapping is held firmly and is only released by the separating device when the punch returns to its original position.

The punch is generally located approximately in the center compared to the foot. The cutting blade is usually an upper knife, which interacts with a foot edge as a lower knife. This means that one edge of the foot, the edge of the foot, acts as the lower knife, while the cutting blade takes over the function of the upper knife in the scissors or metal scissors realized in this way. As a result, cutting angles can be introduced into the strapping to be severed, which are fundamentally variable and, for example, can be or can be values in the range from 1 ° to 50 °, for example in relation to the cross-band direction.

The punch and the cutting blade are each largely moved vertically in comparison to the foot or are designed to be vertically movable in comparison to the foot. For this reason, a common punch can be provided to act on both the punch and the cutting knife. In this context, the design is usually made such that the punch is equipped with a protrusion compared to the cutting knife and, taking this protrusion into account, is connected to the common stamp together with the cutting knife. The protrusion ensures that the punch initially penetrates all or part of the strapping and in this way holds the end of the strapping that is subsequently to be severed. Only when the punch has completely or partially penetrated the strapping does the cutting knife as the upper knife in conjunction with the bottom edge as the lower knife ensure the desired cutting process and the cutting of the strapping.

The punch and / or the cutting knife are generally mounted on a common flange. The flange also ensures your

Linear guide when the stamp is applied. For this purpose, the punch and the cutting knife are oriented opposite to the flange in the middle. In addition, the punch or the cutting knife can be floating against the flange. In principle, the flange as a whole can also have a floating bearing in relation to a machine frame. As a result, when the punch penetrates the strapping and because of its tensile stress, overall reduced shear forces act on the punch. Comparable may apply to the cutting knife. As a rule, however, the punch is mainly floating against the flange. For this purpose, one or more springs are generally provided, which on the one hand continue to provide perfect linear guidance of the punch using the flange, but on the other hand allow lateral movement of the punch.

In addition, a strap detection device is provided for position detection relative to the strapping strap to be severed. That is, with the aid of the strap detection device, the previously described and inventive severing device is aligned with the strapping to be severed. Such a position detection and tape detection device is particularly recommended in the event that the separating device works stationary and is connected, for example, to a robot arm or generally to a three-dimensionally movable actuating device. Such a band recognition device is of course not absolutely necessary for mobile use of the separating device, which is also possible, because the positioning of the separating device is carried out by an operator.

The band detection device is usually designed as a laser measuring device. The laser measuring device is used, for example, to scan the surface of a metal strip coil strapped with a steel strip. The strapping is shown on this surface as a rectangular elevation, which can be determined via the laser measuring device and at this point by means of respective distance measurements. This allows the position of the strapping to be determined and the separating device to be aligned precisely. In addition, once the position of the strapping has been determined, the separating device is usually pushed down with the foot under the tensioned strapping using the three-dimensional adjusting device in such a way that the push edge realized on the foot ensures that the strapping is lifted off the strapped material and the foot can be pushed under. Only then does the separation process already described in detail occur.

For the drive of the punch and the cutting knife, all drive forms that are fundamentally possible in this context can be used. In fact, a hydraulic and / or pneumatic and / or electric drive is conceivable at this point. If an electric drive is used, it can in turn work with AC voltage connected to the mains. However, it is also possible to use battery power on a handheld device. Consequently, the separation device can be designed to be mobile or stationary overall. As a result, a separating device for strapping is made available, which works particularly safely and reliably. This also applies, in particular, to strapping tapes or steel straps that are under particularly high pretension during the cutting process, as is observed, for example, with steel straps used for strapping metal strip coils

be used. With strapping of this type, the separating device implemented according to the invention ensures that the severed end of the strapping in question cannot spring open in an uncontrolled manner and causes damage or injuries to operating personnel. This is not possible with previously known separation devices used in practice. This is where the main advantages can be seen.

The invention is explained in more detail below on the basis of a drawing illustrating only one exemplary embodiment; show it:

1 An overview of a separation device,

Figures 2A to 2D details of the separation device of FIG. 1 from different angles and

Fig. 3 shows the severed end of the strapping with the diecut formed.

A separating device is shown in the figures, by means of which strapping straps 1 indicated in FIG. 1 can be severed. The strapping 1 is mostly steel straps. The invention is of course not restricted to this. The steel straps or strapping 1 in question are, according to the exemplary embodiment, wrapped around metal band coils (not shown in more detail) and are intended to be severed for further processing of the metal band coils. For this purpose, the separating device shown in FIG. 1 is pushed under the tensioned strapping band 1 using a foot 2 with a pushing edge 3 in the direction shown by a double arrow in FIG. 1. For this purpose, the separating device shown in the overview in FIG. 1 may be connected to a device indicated in FIG. 1 and

three-dimensionally operating actuator 5 may be connected. The actuating device 5 is advantageously a robot arm. Of course, this only applies as an example. In addition, the actuating device 5 is fundamentally unnecessary in the case that the separating device is designed to be mobile and is acted upon by an operator.

In any case, the actuating device 5 shown in FIG. 1 ensures that the separating device to be described in detail below is pushed with its foot 2 under the tensioned strapping band 1. The push edge 3 inclined in this context ensures that this process can be carried out and that the tensioned strapping 1 is increasingly lifted off the strapped material. For this purpose, the pushing edge 3 may have an inclination indicated in FIG. 1 corresponding to an associated inclination angle a of approximately 10 ° with respect to a horizontal line. Typically, angles of inclination a between 5 ° and 20 ° are observed. Of course, this is not restrictive. The angle of inclination a also specifies an angle of intersection when severing the strapping band 1 to be described later. In particular, the detailed representations in FIGS. 2A to 2D now show the base 2 with the pushing edge 3 and additionally a pressure element 4 and a cutting blade 5. With the aid of the pressure element 4, the strapping 1 can be fixed between the base 2 and the pressure element 4. This fixation ensures during a cutting process using the cutting blade 5 that the strapping 1 under tension does not spring open after the severing and that the end of the strapping 1 thus severed, which is severed with the cutting blade 5, is held.

The cutting blade 5 for severing the fixed strapping band 1 acts as an upper knife in this process. In contrast, a foot edge 6 on the foot 2 assumes the function of a lower knife 6. In this way, the movable cutting blade 5 and the foot edge 6 define a total of scissors 5, 6 or metal scissors 5, 6, provided that the strapping band 1 is a steel band is. Both the cutting blade 5 and the pressing element 4 are largely designed to be movable vertically in comparison to the base 2, as indicated by a double arrow in FIG. 2B. For the corresponding movement of the pressing element 4 and also the cutting blade 5, a common and merely indicated stamp 7 ensures according to the exemplary embodiment. The stamp 7 can also be a cylinder. In any case, the plunger 7 executes the traversing movements shown in FIG. 2B vertically in comparison to the base 2. A hydraulic drive may take care of driving the plunger 7 or a cylinder at this point.

According to the invention, the pressing element 4 is designed as a punch which at least partially penetrates into the strapping band 1. According to the embodiment, the punch 4 is one which is triangular in cross section. Consequently, the foot 2 also has a corresponding receptacle 8 in the foot 2, which is also triangular and is adapted to the shape of the triangular punch 4. As a result, the punch 4 can penetrate the strapping 1 as a whole or at least partially penetrate it and immerse it in the receptacle 8 in the base 2.

The punch 4 is equipped on the foot side with a nose 9 projecting in the pressing direction or the direction of travel of the punch 4 according to the double arrow in FIG. 2B. It also joins the

projecting nose 9 against a recessed shoulder 10. The projecting nose 9 is provided in the region of a tip of the triangle of the triangular cross-sectional shape of the punch 4. In contrast, the stop shoulder 10 extends in the direction of a base side of the triangle in question opposite the tip.

In this way, the punch 4 penetrating into the strapping 1 forms a punch 11, indicated in FIG. 3, in the strapping 1. This punched piece 11 in the strapping band 1 is established in that the punch 4 with its projecting nose 9 cuts through the strapping band 1. Since the stop shoulder 10 adjoining the projecting nose 9 springs back relative to the nose 9, the punched part 11 is connected unchanged to the strapping band 1 with the base side of the triangle. In this way, the abutment shoulder 10 adjoining the projecting nose 9 bends the punch 11 against a band surface of the strapping band 1.

The bent die-cut 11 can more or less dip into the receptacle 8 in the foot 2 during this process. In this way, the punch 4, the bent die-cut 11 and the receptacle 8 in the base 2, taken together, ensure that the end of the strapping 1 that is subsequently separated is securely held by the separating device. This is because the punch 4 penetrating into the strapping band 1 acts as if it were a claw dipping into the strapping band 1 and ensures a secure hold.

The punch 4 is arranged approximately in the center compared to the foot 2. The same applies to the receptacle 8 cooperating with the punch 4 in the base 2. In addition, one can see from the detailed representations in FIGS

FIGS. 2A to 2D show that the punch 4 is connected to the common punch 7 with a projection U opposite the cutting knife 5. This overhang U is dimensioned such that when the punch 7 is acted upon, the punch 4 first penetrates into the strapping 1 and forms the bent punch 11 as shown in FIG. 3. As a result, the end of the strapping band 1 which is still to be cut off is securely held. Only after this fixing of the end of the strapping 1 to be severed does the cutting blade 5 ensure that the strapping 1 is severed. For this purpose, the cutting blade 5 and the base edge 6 define the cutting knife 5, 6 already described above. A flange 14 for the common mounting of the punch 4 and the cutting knife 5 ensures their proper linear guidance. For position detection and alignment of the separating device described with respect to the strapping band 1 to be held tight, a band recognition device 12 can also be provided, which is only indicated in FIG. 1. In the present case, the band recognition device 12 works as a laser measuring device, as has already been described in the introduction. To control the three-dimensionally operating control device S, a common control unit 13 is provided, which processes corresponding measured values of the band recognition device 12 and controls the control device S accordingly, so that it can move the foot 2 for severing the strapping band 1 and thus the cutting device as a whole.

A pneumatic motor or an electric drive can be used to drive the stamp 7. If an electric drive is used, it can be operated with, for example, mains voltage or AC voltage. Likewise, a mobile use by a battery-operated

electric drive possible and is encompassed by the invention. Consequently, the separating device can be designed to be mobile as a handheld device or stationary in connection with the described three-dimensional adjusting device S. Both are expressly possible.

A comparative view of FIGS. 2A to 2D shows that the punch 4 and the cutting knife 5 are mounted on the common flange 14. The flange 14 ensures the desired linear guidance of both the punch 4 and the cutting knife 5. In addition, a floating bearing can be realized in this context. In fact, according to the exemplary embodiment, the flange 14 permits lateral movement of the punch 4, for example by springs attached to both sides and not shown in detail, that is to say in the longitudinal direction of the strapping band 1. This increases the wall force exerted by the strapping band 1 on the punch 4 cushioned. As a result, any shear forces acting on the punch 4 are reduced.

Claims

claims:

1. Separating device for strapping (1), with a movable pressing element (4), furthermore with a foot (2) with a push edge (3) for the strapping (1) which can be fixed between the foot (2) and the pressing element (4) ), and with a cutting blade (5) for severing the fixed strapping band (1), characterized in that the pressing element (4) is designed as a punch (4) which at least partially penetrates into the strapping band (1).

2. Device according to claim 1, characterized in that the foot (2) has a receptacle (8) for the punch (4).

3. Device according to claim 1 or 2, characterized in that the punch (4) is polygonal in cross-section, in particular triangular, oval or round.

4. Device according to one of claims 1 to 3, characterized in that the punch (4) with a protruding in the pressing direction nose (9) and an adjoining stop shoulder (10) is formed.

5. Device according to claim 4, characterized in that the projecting nose (9) penetrates into the strapping band (1) and the adjoining shoulder (10) bends a punched part (11) thus formed against a band surface.

6. Device according to one of claims 1 to 5, characterized in that the punch (4) is arranged approximately in the center of the foot (2).

7. Device according to one of claims 1 to 6, characterized in that the cutting blade (5) cooperates as an upper knife with a foot edge (6) on the foot (2) as a lower knife.

8. Device according to one of claims 1 to 7, characterized in that the punch (4) and the cutting blade (5) are each largely movable vertically in comparison to the foot (2).

9. Device according to claim 8, characterized in that a common stamp (7) for loading the punch (4) and the cutting knife (5) is provided.

10. Device according to one of claims 1 to 9, characterized in that the punch (4) with respect to the cutting knife (5) is connected to the common punch (7) with an overhang (Ü).

11. Device according to one of claims 1 to 10, characterized in that the punch (4) and / or the cutting knife (5) are preferably floating on a common flange (14).

12. Device according to one of claims 1 to 11, characterized in that a tape detection device (12) is provided for position detection relative to the strapping to be severed (1).

13. The device according to claim 12, characterized in that the band detection device (12) is designed as a laser measuring device.

14. Device according to one of claims 1 to 13, characterized in that a hydraulic and / or pneumatic and / or with mains voltage or battery operating drive for the stamp (7) is provided.

15. Device according to one of claims 1 to 14, characterized in that it is designed to be mobile or stationary.