WO1993013988A1

WO1993013988A1 - Process and device for automatically binding bales with at least one plastic strap

Info

Publication number: WO1993013988A1
Application number: PCT/DE1993/000032
Authority: WO
Inventors: Siegfried Sommerfeld
Original assignee: Siegfried Sommerfeld
Priority date: 1992-01-17
Filing date: 1993-01-16
Publication date: 1993-07-22
Also published as: DE4201086C2; AU3254593A; EP0620793A1; DE4201086A1

Abstract

In a process for automatically binding bales produced in a bale press with at least one plastic strap which is conveyed, after the bales have been pressed, in the form of a loop through the pressing channel to a clamping device, a free end of the strap is connected to the tightened strap of the endless loop surrounding the bale to complete the binding of the finished bales and, after the binding has been separated, the other end can be prepared to form a new endless loop for the next bale to be pressed. Binding is made easy if, after passing through the pressing channel, the entire loop (16) is deviated and both sections (16a, 16b) of the loop (16) are firmly clamped. The section towards the bale overlaps the end of the endless loop (14) binding the bale (13) and is welded to it. The sections are separated and the clamp holding the welded section is released, while the clamped free end of the other section (16a) is taken to the basic position for a new pressing cycle by pivoting the clamping device (9).

Description

Method and device for automatically strapping balls with at least one plastic band

The invention relates to a method and a device for automatic strapping of bales produced in a baler with at least one plastic band, which is fed from one side of the baler and is pulled as an endless loop by the pressed material pressed into the baling channel, that after the baling has been finished, the trailed Plastic tape as a loop is first moved across the press channel and transported to a clamping device, with a free tape end in an overlap area connected to the drawn tape to close the strapping of the finished pressed bale and, after being separated from the strapping, the other to form a new endless loop for preparing the next bale to be pressed.

The strapping of bales fed horizontally in a baling press of a baler in automatic operation has become known from US-A 3 543 675. In addition to the fact that in this baler a strap length corresponding to a partial length of the pressed bale must first be stored in a special device before the start of the baling, numerous mechanical components are also required to finally close the strapping. In addition to the separate belt storage device, a gripper arm actuated by a hydraulic cylinder for gripping a strand of the endless loop and a lifting fork lifting the strapping belt are also required. The fully automatic strapping sets not only a considerable amount of construction work ahead, but is also very time-consuming in view of the coordinated movements of the various components.

The invention is therefore based on the object of providing a method and a device with which the strapping of bales produced in a baler with a plastic ban can be achieved fully automatically in a simple manner and with little mechanical effort.

This task is solved procedurally with the measures specified in the characterizing part of the main claim. The invention is based on the knowledge that complicated, unnecessary time-consuming movements, which also require a correspondingly complex mechanism, can be avoided when strapping bales with plastic tape if the plastic tape moves across the baling channel after the bale has been completed as a loop - In practice, several plastic straps wrapped at a distance from each other around the bale are always used for tying - then also as a loop to the downstream devices, ie the clamping device, the welding device and the cutting device is transported. It is thus possible to achieve two strands of the plastic band, which can be used independently of one another for different purposes which improve the fully automatic operating sequence.

While one strand is used to close the endless loop wrapping around the bale by welding, the other strand can be used to prepare the endless loop for the next bale to be pressed. It is clamped in the clamping device, so that - after the previous severing of the falling ends resulting from the loop - the free end, which is not required for welding the endless loop wrapping around the bale, of the continuously pulled from a supply roll of the strapping band into the Basic position for a new press cycle can be brought. This can advantageously be achieved in that the clamping device is pivoted through 180 ° after each pressing cycle. The separation of the strap and the release or release of the clamping for the strand of the loop required for welding thus take place before the pivoting of the clamping device. This can have a central pivot axis and diametrically opposite clamping jaws or pairs, so that there is a cantilever-like clamping device, provided at both ends with a pair of clamping jaws.

The clamping device, which can advantageously be raised and lowered or moved back and forth in the case of a vertical press, can first be removed from the after the strapping has been completed

Move the strapping out and then return it to its operating position.

If the clamping device preferably has an axially displaceable opening gate, which is provided with groove recesses for pivotable latching bolts arranged on the pairs of clamping jaws, opening and closing of the clamping jaws of the two pairs of small jaws can be achieved without the adjusting movements ^; need transmission lines. The clamping device can therefore make 360 ° rotations unhindered, each with the cyclical pauses in this case after a 180 ° swiveling movement. The clamping device can thus be operated without swiveling back and forth. For example, a cylinder-like actuator can be used to move the opening gate. Due to the contours of the groove recesses, the pivotable latches of one pair of jaws are pushed into a locking position and the latches of the other pair of jaws are pushed out of the latching latching position when the opening link is moved.

It is recommended that the 'locking bolts are arranged on both sides of the jaw pairs. The spring bearing, For example, each locking bolt can be attached to a leaf spring or between the two locking bolts a two-armed spring can be arranged with their arms pushing the locking bolts outwards, allowing the locking bolts to move automatically into their catch when the opening slot is moved due to the contour of the groove recesses - or release position.

According to a proposal of the invention, the outer jaws of the two pairs of jaws are loosely inserted in a base plate of the clamping device provided with locking recesses for the locking bolts and spring-loaded to the outside, and the inner jaws are stationary on a jaw plate placed on the base plate. The spring loading, e.g. by means of a compression spring, causes the outer jaws to always be held in an open position, and only when the outer jaw loosely guided in the base plate is displaced does the pair of jaws close and the outer jaw presses against the stationary jaw of the jaw plate. To open the clamping jaw, it is then only necessary to axially shift the opening link in the opposite direction, so that a corresponding movement occurs automatically due to the positive guidance of the groove recesses.

If the opening link is advantageously provided with a centering spring, it can be positioned in the base plate or the clamping jaw plate of the clamping device or brought into a central position.

According to one embodiment of the invention, it is proposed that a transport carriage pulling the deflected belt loop has two drivers immersed in the belt loop and is positively guided by guide rails on both sides in longitudinal grooves of ramp-like design. Due to the ramp-like course of the longitudinal grooves, which have a front and a rear slope section and a straight line in between Having section, the transport carriage pulling the belt loop is lifted over the clamping device and immediately lowered again after it has been driven over. The two drivers, which are designed as fingers and are spaced apart from one another in accordance with the width of the drawn loop, are of such a length that, despite the lifting movement, they nevertheless remain in engagement with the belt loop.

It is proposed that, as viewed in the direction of travel of the transport carriage, a free-moving bridging element that extends the straight section of the ramp-like longitudinal groove is assigned to the upward-sloping sections of the longitudinal grooves. When the trolley returns from its end position to the position for taking over a new loop, the bridging member serves to hold the trolley in the raised position until it reaches the take-over position, so that it can fall down into the belt loop with its driving fingers.

In order that a loop transport can be achieved, according to one embodiment of the invention, a lance having a lance with a threading slot facing the outer carrier of the transport carriage, which is remote from the bale, can be inserted at the front end of a lance that dips through the baling channel into the plastic band to be drawn from the bale to be pressed . This creates a free space in which the external driver finger can immerse without being disturbed. If a deflecting pin is advantageously assigned to the strand of the endless loop facing the bale, which can be brought into an operating and an out-of-operation position, an immersion space also results for the internal driver finger. This plunges between the lance disc and the deflection bolt into the belt loop.

If, in the end position of the transport carriage, a clamping stop against which the driver fingers can be moved is preferably arranged, the plastic band can be tightened The belt loop is clamped and secured against slipping until the two strands are fixed, ie one strand is held in a pair of clamping jaws of the clamping device and the other strand is held in or by the welding device.

Further features and advantages of the invention result from the claims and the following description, in which an embodiment of the subject matter of the invention is explained in more detail with reference to a horizontal baling press. Show it:

Figure 1 shows the baler according to the invention before pressing a new bale, shown schematically in plan view;

Figure 2 shows the baler according to Figure 1 after the final pressing of a new bale and before closing the strapping, shown schematically in plan view;

3 shows the baler according to FIG. 2 with the welding device retracted for connecting the overlapping ends of the strapping, shown schematically in the top view;

Figure 4 shows the baler according to Figure 3 after welding the strapping and with separated waste ends, shown schematically in plan view;

FIG. 5 shows the baling press according to FIG. 4 after the strapping process has ended and before pivoting the clamping device with the clamped band end into the position shown in FIG. 1, shown in a schematic plan view; characters

6a to 6d as a detail of the baler according to the invention, the plastic belt deflection in several

Operating stages, starting from the basic position according to FIG. 6a to the end position according to FIG. 6d, shown in partial section;

FIG. 7 shows a simplified view in perspective view corresponding to the operating position according to FIG. 6c;

Figure 8 shows the clamping device as a detail in a perspective view and as a partial section;

FIG. 9 shows an exploded view of the clamping device according to FIG. 9; and

Figure 10 shows the clamping device according to Figure 8 in plan view.

In the figures are essentially of a baler, not shown in detail, for example with an output of about 45t baling pressure and a size of the bale to be pressed of 800 X 800 X 1200mm, in which the bales are strapped three times and which can be fed continuously the press channel 1 and the plunger 2 which can be moved back and forth in the press area, a supply roll 3 for plastic strip 4 to be retightened and a lance 5 which can be moved up and down to pull the band through the press channel 1. This carries at its front end a disc 6, which is adapted to the height of the flat material of the plastic band 4 and is also provided with a threading slot 7 (see, for example, FIGS. 6a and 7). Parallel to the outside of the press channel 1 on the side opposite the lance 5 is a central pivot axis 8 (see FIG. 7). pivotable, boom-like clamping device 9 is arranged. This has diametrically opposite clamping jaws 10a, 10b and 11a, 11b, each consisting of a pair of clamping jaws 10 or 11. (see Figure 6a). The clamping device 9 will be described in detail later.

In the position according to FIG. 1, the baler is ready for a new pressing process. Finished bales 12a, 12b have already been tied with the plastic band 4 in the form of endless loops, and a new bale 13 to be pressed is compressed by appropriate strokes of the plunger 2. A plastic tape 4 held at one end in the pair of clamping jaws 10 of the clamping device 9 lies against the bale 13 to be pressed at its front end face and is drawn off from the supply roll 3 with increasing bale formation. The finished pressed new bale 13 is shown in Figure 2. To close the endless loop 14 wrapping around the bale 13, the lance 5 is moved out of its inoperative position according to FIG. 1 across the baling channel 1, whereby it has a lance shaft 15 provided in the baling piston 2 - the number of lance bores and thus lances depends on that for tying up the bale required number of endless loops - happens. The disc 6 of the lance 5 is immersed in the plastic band 4, so that a loop

16 forms, after the exit from the press channel 1 by a transport carriage shown schematically in Figures 2 to 4

17 is gripped and deflected, the two strands 16a, 16b of the loop 16 being fed to the clamping device 9 arranged in parallel outside the press channel 1.

The strand 16a is clamped in the pair of jaws 11; the strand 16b is applied to the pair of jaws 10 (see Fig. 6b). A welding device 18 welds the overlapping ends of the strand 16b facing the bale and the plastic strip 4, the end of which corresponds to the strand 16a of the preceding strip loop 16, so that the endless loop 14 is closed. As soon as this has been done, a cutting device designed as a cutting knife 19 separates the strands 16a, 16b through, as shown in Figure 4 and Figure 6. The strap waste 20 is removed and the pair of jaws 10 released, while the pair of jaws 11 still holds the free end of the strand 16a clamped, so that after the pivoting of the clamping device 9 according to the rotating arrow 21 (see FIG. 5) the plastic band 4 into the position 1 arrives for a new pressing process; the lance 5 with the disk 6 has also been moved back to its starting position as shown in FIG. 1. A new press stroke can then take place from this starting position.

In FIGS. 6a to 6d, the deflection of the loop 16 drawn by the disk 6 of the lance 5 and its transport to the clamping device 9 and the closing of the plastic band wrapping around the ball to form an endless loop 14 by means of the welding device 18, which is an ultrasonic welding, one Friction welding or a mirror welding system can be shown in different operating states in detail. The transport carriage 17 (cf. FIG. 7), which can be moved, for example, by means of a drive via a linkage 22 and has an inside and an outside driving finger 23 or 24, is in accordance with FIG. 6a from its end position, in which it with its driving fingers 23, 24 a clamping plate 25 is applied, in the takeover position decreasing the loop 16 to the lance 5 (see FIG. 6a the hatched driver fingers 23, 24). The transport carriage 17 is positively guided on both sides in longitudinal grooves 26 in the form of ramps by guide rails 27, as shown in FIG.

The longitudinal grooves 26 have - starting from the end position of the transport carriage 17 shown in FIG. 7 - a first slope section 28 on the outlet side, which is followed by a straight section 29 which then merges or falls into an slope section 30 on the inlet side. On its way to the lance 5, the transport carriage 17 is therefore first raised so that it runs in the area of the straight section 29 above the clamping device 9. During its journey into the position taking over the belt loop 16, however, it then does not immediately reach the uphill section 30 on the inlet side, but rather a bridging member 31 that is freely movable and extends in the longitudinal groove 26 and extends the straight section 29. The transport carriage 17 is thus to be taken over Belt loop 16 in a raised position and can easily be threaded into the belt loop 16 from above, namely because it falls down after passing the bridging member 31. With its external driver finger 24, it falls into the threading slot 7 provided for this purpose in the disc 6 of the lance 5, and its internal driver finger 23 engages in the belt loop 16 next to the disc 6 (see FIG. 6a). In the subsequent movement of the transport carriage 17 into its end position, however, it then runs on the inlet-side slope section 30 and gradually rises, whereby it automatically swivels the freely movable bridging member 31 upward. As soon as the transport carriage 17 has passed over the clamping device 9 and, following the straight section 29 of the guide groove 26, reaches the slope section 28 on the outlet side or inclination section 28 with respect to the return direction, it gradually decreases in accordance with the inclination of the section 28. The outer strand 16a removed from the bale is inserted between the jaws 11a, 11b of the pair of jaws 11, while the inner strand 16b facing the bale or the baler (press channel 1) contacts the outside of the inner jaw 10b of the pair of jaws 10 creates (see FIG. 6b in connection with FIG. 7). The deflection of the belt loop 16 is supported by a deflection bolt 32, which is arranged outside the belt loop 16 so that it can be engaged and disengaged.

After the driver fingers 23, 24 have moved into their end position against the clamping stop 25, the plastic band 4 clamps or the strands 16a, 16b of the band loop 16 clamp between the driver fingers 23, 24 and the Clamping stop 25 fixed; they are secured against slipping. At this point in time, the pair of clamping jaws 11 is closed and the falling end 20 is separated from the strand 16a by means of a cutting edge 19a (cf. FIG. 6b). The welding device 18 is then brought to the required height with the aid of a threaded rod 33 and a rod guide 34. The welding device 18 is now jammed and connects the two overlapping areas, i.e. the ends of the strand 16b and the plastic band 4 of the endless loop 14, the end of which is identical to the strand 16a of the band loop 16 drawn for the previous bale.

Following the welding operation, the cutter 19 separates the waste end 20 from the strand 16b, and after opening, e.g. the tying or endless loop 14 is completed with hydraulic adjusting means, the pair of clamping jaws 10a, 10b; the welding unit 18 and the cutting device 19 are then lowered down out of the strapping. Thereafter, the lance 5 is moved back into its position shown in FIG. 1, and the deflecting pin and the clamping device 9 are also lowered, so that the endless loop 14 is released and can be tightened against the bale 13. The clamping device

9 is then raised again and pivoted by pivoting through 180 ° according to the arrow 21 from the operating position according to FIG. 6c into the ready position according to FIG. 6d for a new pressing process. With the renewed movement of the transport carriage 17 into the take-over position, the strapping strap waste 20, which was previously clamped between the driving fingers 23, 24 and the clamping stop 25, is released and can be removed from the press area via a suction shaft 35 for disposal.

The clamping device 9 is shown in detail in FIGS

10 shown. It consists of a base plate 36 with slide guides 37 for the outer jaws 10a and 11a of the pairs of jaws 10, 11 to be inserted loosely therein, an axially displaceable one placed on the base plate 36 Opening gate 38 and a jaw plate 39 supporting the stationary, inner jaws 10b or 11b, which is placed on the base plate 36 and includes the opening gate 38. The opening guide 38 is .versehen with a ■ ^■ centering spring 40 ^'engages a facing it depression 41 in the base plate the 36th to the jaws 10a and 11a are (groove- example or called-like, jagged or hook-like manner) with a roughened surface trained clamping lugs 10c and 11c are placed on each of the diagonally opposite sides of the clamping jaws 10 and 11, designed as cutting edges 19a (see FIGS. 8 and 9), and there are also on both sides of the clamping jaws 10a and 11a pivotally mounted latches 42 and 43 (see FIG. 10), to which 38 groove recesses 42a and 43a are assigned in the opening link.

A two-armed pressure spring 44 is arranged between each of the two latches 42 and 43 (see FIG. 10), which acts on the latches 42 and 43 to the outside. A compression spring arranged in the slide guide 37 of the base plate 36 between the opposite movable clamping jaws 10a and 11a. ^"45 (see. FIG 8) acts upon the movable jaws 10a and 11a, and holds the clamping jaw pairs 10 and 11 in the open position, ie between the jaws 10a, 10b, and 11a, 11b there is a free gap.

To close the jaws 10a, 10b and 11a, 11b of the pair of jaws 10 and 11 and thus clamp the strand 16a of the plastic band 4, the corresponding outer jaw 10a or 11a is moved inwards via an actuator, for example a cylinder, the corresponding locking bars are forced into the provided in the base plate 36 Rastausfräsun ^'gen 46 (see FIG. 9) 42, 43 and secure the clamping position. To open the pair of jaws 10 and 11, projecting webs 47 of the opening link 38 are acted upon from the base and jaw plate 36, 39 and the

Opening gate 38 thus axially displaced, the End positions of setting recesses can be specified. The locking latches 42 and 43 protruding into the groove recesses 42a and 43a of the opening link 38 are moved out of the corresponding locking recesses 46 of the base plate 36 due to the obliquely milled forced guides of the groove recesses 42a and 43a, so that the clamping jaws 10a, 10b and 11a , 11b of the pair of jaws 10 and 11 to be opened automatically open by simply moving the opening link 38, ie move them away from each other.

Claims

1. A method for fully automatic strapping of bales produced in a baler with at least one plastic band, which is fed from one side of the baler and is pulled along as an endless loop by the pressed material pressed into the baling channel, that after the bale has been finished pressed, the traced plastic band is initially transversely looped is moved through the baling channel and transported to a clamping device, one free band end being connected in an overlap area to the drawn band to close the tying of the finished pressed bale and, after being separated from the tying, the other to form a new endless loop for the next bale to be pressed is prepared, characterized in that after crossing the baling channel, the entire loop is deflected and both strands of the loop are clamped, of which the strand facing the bale tying the end of the band of the bale en endless loop is overlapped and welded with it, that the strands are severed and the clamping of the welded strand is released, while the clamped free end of the other strand is brought into the basic position for a new pressing cycle by pivoting the clamping device.

2. The method of claim 1, d a d u r c h g e k e n n z e i c h n e that the clamping device is pivoted by 180 ° after each press cycle.

3. Device for performing the method according to claim

1, so that the clamping device (9) is arranged in parallel outside the press channel (1).

4. The device according to claim 3, that the clamping device (9) has a central pivot axis (8) and diametrically opposed pairs of jaws (10, 11).

5. Apparatus according to claim 3 or 4, d a d u r c h g e k e n n z e i c h n e that the clamping device (9) can be raised and lowered.

6. The device according to one or more of claims 3 to 5, characterized in that the clamping device (9) has an axially displaceable opening gate (38) which with groove recesses (42a, 43a) arranged on the jaw pairs (10,11), pivotable Locking latch (42, 43) is provided.

7. The device according to claim 6, characterized in that the locking bolts (42, 43) on both sides of the jaw pairs (10, 11) are arranged resiliently.

8. Apparatus according to claim 6 or 7, characterized in that the outer jaws (10a, 11a) of the two pairs of jaws (10, 11) loosely in a provided with locking millings (46) for the locking bolts (42,43) base plate (36) Clamping device (9) is inserted and spring-loaded to the outside, and the inner clamping jaws (10b, 11b) are arranged stationary on a clamping jaw plate (39) placed on the base plate (36).

9. The device according to one or more of claims 6 to 8, that a d u r c h g e k e n z e i c h n e that the opening gate (38) is provided with a centering spring (40).

10. The device according to one or more of claims 3 to 9, characterized in that a deflected belt loop (16) pulling transport carriage (17) has two drivers (23, 24) immersed in the belt loop (16) and on both sides in longitudinal grooves formed in ramps ( 26) of guide rails (27) is positively guided.

11. The device according to claim 10, characterized in that the upstream sections (30) of the longitudinal grooves (26) seen in the running direction of the transport carriage (17) are assigned a freely movable, the straight section (29) of the ramp-like longitudinal groove (26) extending bridging member (31) is.

12. The device according to one or more of claims 3 to

11, characterized in that one through the press channel (1) into that of the at the front end a lance (5) with a plastic band (4) which is drawn into the bale (13) and a disc (6) with a threading slot (7) facing the outside carrier (24) of the transport carriage (17) which is remote from the bale (13) ) having.

13. The device according to one or more of claims 3 to 12, d a d u r c h g e k e n n z e i c h n e t that the bale (13) facing strand (16 b) of the belt loop (16) is assigned a deflecting bolt (32).

14. The device according to one or more of claims 3 to 13, d a d u r c h g e k e n n z e i c h n e t that in the end position of the trolley (17)

Clamping stop (25) is arranged.

15. The device according to one or more of claims 3 to 14, that the clamping device (9) is followed by a welding device (18) and a cutting device (19).