CH637074A5 - Bagger. - Google Patents

Description

637074

2nd

PATENT CLAIM Sacking device with a storage table for the empty sacks that are successively removed from a stack of sacks.These can be fed with the aid of suction heads which engage in the area of the sack opening on both sides and can be fed away from the storage table to a sack nozzle connected to a filling device, the filling device being controlled by a control after each attachment the sacks can be actuated on the bagging nozzle, characterized in that in the area of the storage table (2) there is provided a measuring sensor (17) determining the bag thickness, the output signal of which is present as an actual value on the controller (16), and that the controller (16) controls the Activation of the filling device (11) blocks after a setpoint / actual value comparison if the setpoint is exceeded.

The invention relates to a bagging device with a storage table for the empty sacks which are successively removed from a stack of bags and which, with the aid of suction heads acting on both sides in the area of the bag opening, can be fed and can be fed away from the storage table to a bagging nozzle connected to a filling device, the filling device being provided via a Control can be actuated after the sacks have been placed on the bag neck.

As a result of electrostatic charging, but also due to the fact that the sacks made of foils, which have not cooled sufficiently after welding, stick together, it often happens that not a single sack, but two sacks adhering to one another, are removed from the stack and conveyed to the storage table. If the suction heads used to open the sacks attack such a pair of sacks, the two mutually adhering sacks are merely separated from one another, and it cannot be expected that one of these two sacks will be opened properly. In the course of the further workflow, these two bags are guided against the bag neck, without the bagging device recognizing that, instead of an open bag, two unopened bags were led to the bag neck. The subsequent filling of this supposed sack naturally causes the contents to fall through between the two sacks and contaminate the bagging device, which makes laborious cleaning work necessary, especially if the sacks are to be filled with aggressive agents, for example salts, synthetic fertilizers or the like.

The invention is therefore based on the object of avoiding these deficiencies and of creating a bagging device in which contamination by the filling material when two bags are fed in place of a single bag to the bagging nozzle is excluded with certainty.

Starting from a device of the type described at the outset, the invention achieves the object in that in the area of the storage table there is provided a measuring transducer which determines the bag thickness, the output signal of which is applied to the control as an actual value, and that the control actuates the filling device according to a target Block comparison of actual value when setpoint is exceeded. Since it can be clearly determined via the thickness measurement in the area of the storage table whether properly only a single sack or several sacks are deposited, the measures according to the invention prevent the prepared filling material from being dispensed via the sack spout when two sacks are incorrectly deposited. The

For this purpose, the control only blocks the actuation of the filling device, which has the advantage that no further interventions in the work flow of the device have to be carried out. After releasing 5 of the bags through the ventilation of the suction heads holding them, the bags fall off without causing any damage. The workflow is not interrupted with the exception of the release of the filling device, so that the suction heads moved into their starting position can grasp the sack, which has now been placed on the storage table, open it and put it on the sack nozzle, after which this sack is filled because now the actuation of the Filling device is released.

It can thus be seen that with the help of the measure according to the invention, effective protection against the filling of a pair of bags treated as a single bag is guaranteed without having to intervene in a special way in the workflow of the bagging device.

The subject matter of the invention is shown in the drawing in an exemplary embodiment, specifically a bagging device according to the invention is shown in a simplified block diagram.

As indicated by a pair of driving rollers 1 in the drawing, the empty sacks removed from a stack of sacks are fed via a conveyor to a storage table 2 which is intended to ensure the correct position of the sacks for acceptance by the suction heads 4 arranged in a frame 3 . For this purpose, a directional stop 5 is provided, against which the bags 6 with Hil-30 fe of the drive rollers 1 are advanced. After touchdown; of the suction heads 4 on the sack thus deposited, the suction heads are evacuated and moved apart so that the sack is opened. In order to avoid errors, the suction heads 4 can be designed as sniffer valves 35, which indicate the build-up of a corresponding negative pressure in the suction heads and thus the correct opening of the bag.

The bag opened in this way is then placed with the aid of the suction heads 4 by pivoting the frame 3 40 through a pneumatic cylinder 7 onto a bagging neck 8, which for this purpose has been pivoted into the take-over position via a drive (not shown).

Since the bag 6 can only be properly removed from the storage table 45 and placed on the bag neck 8 when the directional stop 5 is pivoted or lowered, this directional stop 5 is to avoid an additional drive, via a handlebar 9 on the Frame 3 articulated so that with the J0 pivoting of the frame 3, the directional stop 5 automatically verge into the position indicated by dash-dotted lines. pivots.

After placing the bag 6 on the bag 8 and taking over the bag by the holding 55 bake 10 of the bag 8, the frame 3 with the vented suction heads 4 is pivoted back and the bag is brought into its starting position indicated by dash-dotted lines, in which the filling process takes place. For this purpose, the filling device 11, which consists of a tiltable 60 bar weighing container 12 and can be filled with filling material via a storage container (not shown), is pivoted up via a pneumatic cylinder 13, as a result of which the filling material located in the weighing container 12 passes through the bag neck 8 into the bag is poured. After this filling process, a corresponding amount of filling material is weighed into the weighing container 7 again, so that the filling device is ready for the next filling process.

3rd

637074

If, instead of a single sack, two sacks are placed in an incorrect manner on the storage table 2, which, as has been shown in practice, cannot be avoided, the sacks of this pair of sacks are merely pulled apart via the suction heads 4 and fall onto the after the attachment process Filling neck 8 from the ventilation of the suction heads 4, since they cannot be gripped by the holding jaws 10 of the bag neck 8. In order to prevent any filling material from escaping through the bag 8, which is not reinforced with a bag, in such a case the supply line 14 for the pneumatic cylinder 13 is blocked by a valve 15 which is actuated by a controller 16. This control 16 is connected to a measuring value transmitter 17 for the bag thickness, which determines the thickness of the bag material placed on the storage table 2. If the sack thickness determined by the sensor 5 17 exceeds the setpoint value specified for the control 16, this means that more than one sack must lie on the storage table. By a target-actual value comparison, the faulty storage of bags on the storage table 2 can be determined and, depending on this determination, the actuation of the filling device 11 can be blocked via the control 16, which effectively prevents the undesired contamination of the bagging device.

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1 sheet of drawings