ES2290867T3 - PROCEDURE AND DEVICE FOR TRAINING AND DEPOSIT AT A HIGH CADENCE OF A PACKING CASE ON A PALETIZED LOAD. - Google Patents

Abstract

Procedure for forming and depositing a packing sheath (FU) on a palletized load (CA), said sheath being prepared from a flexible plastic wrap wrapped on at least one storage coil (11, 12), process consisting of: - welding the sheath (17) transversely at its free end to create a heat-welded joint (19) held in a low position by at least one placing member (13, 14), - storing on a transfer device and accumulation (15) a predetermined length of envelope and cut the envelope transversely to constitute said sheath (FU), - collect the lower free end and lower the sheath (FU) around the load (CA) object of packaging, keeping it separated by its four angles, and characterized by the following intermediate stages consisting of: - moving the positioning member (13, 14) vertically upwards by dragging the envelope (17) to a position a It is possible to engage the heat-welded joint (19) in the transfer and accumulation device (15), - horizontally move the transfer and accumulation device (15) according to a single horizontal movement orthogonally directed with respect to the movement of the positioning member (13 , 14) to ensure the collection of the lower end of the sheath (FU),

Description

Training procedure and device and high-rate deposit of a packing cover on a load palletized

Technical scope of the invention

The invention relates to a method and to a device for forming and depositing a packing sheath on a palletized load, said sheath being prepared from a flexible plastic wrap wrapped on at least one storage coil, procedure consisting of:

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Weld transversely the wrap at its free end to create a welded joint held in a low position by at least one placing organ,

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store on a device transfer and accumulation a predetermined length of envelope to constitute said cover,

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pick up the lower free end and lower the cover around the packing object, keeping it separated by its four angles.

State of the art

The document EP-A-1060988 describes a device of overpacking a palletized cargo by means of a sheath prepared from a wrap with bellows rolled up so flat on a storage coil. A grip robot it has a motorized accumulator roller on which it is rolled a part of the wrap, a transfer arm of the roller towards the sheath and a separation mechanism of the sheath during the downward movement around the load. The previously welded envelope in transverse direction is held upright with the bellows requested in opening by a positioning organ, which is fixed and arranged with The coil near the ground. The robot transfer arm is moved by a sliding mobile in vertical translation on the frame. In this way the robot arm is set in motion with a first horizontal movement of translation at the time of transfer, and with a second downward movement to Prepare the sheath by welding and cutting after rolling around the accumulator roller. Said second displacement vertical arm is indispensable, since the placing organ of the envelope is fixed. Said combined movement of the robot lengthens the time of preparation and deposit of the cover, and limits the Packing machine speeds.

The document EP-A-395919 refers to a machine of packing a palletized cargo by means of a film heat shrink, comprising four vertical bars equipped with film clamps that can go up and down in the frame, an annular retraction oven, a pair of crossbars horizontal and two cars that can move horizontally to along the crossbars. The bars approach when the car moves to the distribution section, and they separate when the carriage travels over the cargo being packed. That mechanism also ensures the sheathing. The kinematics of a machine of that type does not allow to reduce the cadences of packaging and is Limited to low height loads.

EP1106507 mentions a machine of packing, in which the heat-welded joint, instead of being arranged above, is oriented down. Therefore it is necessary to cover upside down. The placing organ and the welding machine They are located in the lower part. Such a device is adapts to low-load loads, but not at high heights.

Object of the invention

A first object of the invention consists in improve the procedure for preparing and depositing a cover on a palletized load, to accelerate the packing cycles and Increase production rates.

The packing procedure according to the invention It is characterized by the following intermediate stages:

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move the positioning organ vertically upwards dragging the envelope to a high hitch position of the heat-welded joint in the transfer and accumulation device,

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Y move the transfer device horizontally and accumulation according to a single directed horizontal movement orthogonally with respect to the displacement of the placing organ to ensure that the lower end of the sheath.

During the return trip of the device of transfer and accumulation, the placing organ moves towards an intermediate waiting position located just in front of said high position of collecting the film in the element accumulator. This results in a gain of time. corresponding to the duration of the ascent path of an organ positioner between the low position and the intermediate position of wait.

To make the cover, you can use a tubular wrap with or without bellows and made of material heat shrink or stretch plastic.

The vertical displacement of the envelope towards up by drag of the placing organ, and the transfer horizontal of the case rolled over the accumulator cause two independent translation movements to each other, when contrary to the combined movement of the robot according to the document EP-A-1060988. It has as consequently an acceleration of the packing cycles and an increase of the production rates.

A second object of the invention consists in make a machine for the formation and deposit of a sheath Packing on a palletized load, allowing cadences of high production and that you can use interchangeably a heat shrink or stretch plastic wrap.

The machine includes a device transfer and accumulation comprising an accumulator element on which a part of the wrap is wrapped, and a mechanism of separation of the open end of the envelope after the transfer to the holster post. According to the invention, the placing organ is movable in height at the preparation stand at be coupled to an actuator, so that it shifts the envelope between a low standby position and a high hitch position of the heat-welded joint in the accumulator element.

The transfer and accumulation device is mounted with rotation on a vertical axis of an arm of drive to place the heat-welded joint in parallel or in perpendicular to the greater face of the load. The placing organ is guided in vertical translation between the two low and high positions by a guide rod or rail attached to a support.

Other features can be used in combination:

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he support of the two positioning organs is mounted on a walkway fixed to the frame above the ground;

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he support is adjustable on a horizontal crossbar attached to the frame, and is equipped with two placing organs that can be alternately placed in front of the accumulator organ by means of a horizontal movement of support translation;

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the placing organs keep wraps that come out of two superimposed coils whose axis extends in parallel or in perpendicular to the maintenance conveyor;

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he deposit arm is provided with forming fingers and grip to pick up the four angles of the open part a shrink wrap film;

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he deposit arm is provided with folding fingers and stretching intended to ensure successively folding in accordion of the extendable plastic film cover after the rotation of motorized wheels, followed by stretching transverse by the four angles before the descent around load.

Summary description of the drawings

Other advantages and features will come off more clearly from the following description in a way of embodiment of the invention offered by way of non-limiting example and represented in the attached drawings, in which:

Fig. 1 and 2 are schematic views of the preparation post of the sheath according to the invention, with two placement bodies respectively in waiting position and in position of movement of one of the placing organs towards the accumulator element;

fig. 3 to 9 show views schematics of the complete device with the preparation station and  the sheathing position using a deposit frame of a heat shrink wrap, the device illustrated in different preparation, transfer and deposit phases of the sheath;

fig. 10 to 18 represent the phases following the operation of the device with a frame of tank adapted to an extensible wrap;

fig. 19 is a profile view of the post of cover preparation;

fig. 20 to 22 show the successive stages return of the accumulator roller and the swingarms for the collection of the film at a high rate;

fig. 23 is an identical view of the post of preparation of figure 1, with a variant of the organ accumulator.

Description of a preferred embodiment

Referring to figures 1 to 2, a post of Preparation 10 of a packing case involves a pair of reels 11, 12 storage of a plastic wrap 17, a pair of placing organs 13, 14 intended to open and place the wrap 17 from each coil 11, 12, a device of transfer and accumulation 15 and a means of soldier and of cut 16 to form a cover FU from each coil 11, 12 of a predetermined length and rolled over the device transfer and accumulation 15.

The packaging envelope 17 is formed by a plastic film with double V bellows, and folded flat after winding around each cylindrical coil 11, 12. That type of wrap is described in detail in the document EP-A-1060988. Then it unwinds, passes on guide wheels 18, 18a and is maintained in an upright position with the bellows requested in opening by the placing organs 13, 14. Previously, the middle part of each wrap 17 has been welded transversely at its free end to  get a tight bottom thanks to the formation of a union heat welded 19.

The wrap 17 with bellows can also be replaced by a simple tubular wrap without bellows, and folded  also flat on coils 11, 12.

The film of the envelope 17 can be of heat shrink or stretch plastic. Figures 3 to 9 show an application with a heat shrink film while that figures 10 to 18 illustrate another application with a film extensible. The stages of the FU sheath formation procedure at the level of preparation station 10 they are identical, regardless of the heat shrinkable or extensible nature of The film used.

The transfer and accumulation device 15 includes an accumulator element 20 and a separation mechanism 21 with four tilting arms 22. The accumulator element 20 is provided by way of example of a motorized rotary roller 23 on which a part of the envelope 17 is wrapped, which is held by a retaining clip 24 integrated in the roller 23. The four rocker arms 22 of the separation mechanism 21 they are equipped with clamps 25, arranged in each end to guide and grab the envelope 17.

In the resting position (figure 1) and during wrapping phase of a wrap 17 around the roller 23 (Figures 2 to 4), the four rocker arms 22 are located in contracted position. The swing arm drive 22 towards the separated position (figures 5 and 6) is done by turning medium of pneumatic jacks involved at the time of transfer to the holster post 26.

Welding and cutting means 16 involve a welder with two jaws 27 that can move  in a horizontal plane symmetrically with respect to the organs positioners 13, 14. The upper part of the welder comprises a linear cutting device 28 equipped with a cutting blade rectilinear powered by a cat.

The transfer and accumulation device 15 is mounted around a vertical axis to place the joint heat-welded 19 of the FU sheath in parallel or perpendicular to the major face of the AC load, which usually has a shape parallelepipedic The movement of the FU cover between the position of preparation 10 and the holster post 26 is carried out exclusively in a horizontal plane by means of a carriage transfer 30 carried by a drive arm 31, which It is arranged on top of a vertical frame 32.

The placing organs 13, 14 are mobile in the sense of height, so that they move the welded joint 19 of the sheath from a low position (figure 1) towards a high position (figure 2) to insert it in the retention clip 24 of the roller 23 accumulator. The high position corresponds to a altitude substantially equal to or greater than the level of the upper face of the AC load on the side of the sheath 26.

The actuators 13a, 14a of the organs Positioners 13, 14 are guided in translation by rods 13b, Vertical 14b attached to a support 33, which is located on a horizontal walkway 34 fixed to the frame 22. The support 33 can slide along a horizontal crossbar 35 arranged slightly above the walkway 34, so that it places so alternate one of the positioning organs 13, 14 in front of the clamp retention 24.

The welding and cutting means 16 are interspersed at an intermediate level between the clamps 25 of the tilting arms 22 and the upper ends of the guide rods 13b, 14b.

The palletized AC load is transferred to the post of sheathed 26 by a table 36 with chains or with rollers. A reservoir arm 37 of the sheath FU can slide vertically to along frame 32, and is provided with fingers 38 of shaping and clamping for the collection of the open part of the FU sheath at all four angles at the time of deposit on the AC load (figures 3 to 9). Said fingers 38 are arranged to receive a FU sheath of heat shrinkable plastic film. The AC coated load of its FU sheath then moves towards a lower post, which is equipped with an air heating frame hot which ensures the heat shrinkage of the FU sheath over the CH load.

The operation of the device overpacking with a heat shrink wrap 17 is illustrated in the  Figures 1 to 9:

In figure 1, the two positioning organs 13, 14 are on hold in low position, ensuring maintenance horizontal of the welded joint 19 of the two shells 17 from the two coils 11, 12. The soldier jaws 27 above the rods 13b, 14b are separated from each other, and the clamp holding 24 of the roller 23 accumulator is open to release the grip area of the heat-welded joint 19 of the coating 17 selected. The support 33 moves to the right so which places the placing member 13 in front of the retaining clip 24. The swingarms 22 are in the retracted position, and drive arm 31 is on the right, above the post of preparation 10 of the packing case. In that waiting position  of production, the internal volume of the two envelopes 17 is protected by the associated heat-welded joint 19, avoiding any ambient dust penetration.

In Figure 2, the associated placing organ 13 to the first coil 11 is shifted to the high position located above the upper level of the cargo under packaging. In its displacement in translation upwards, the placing organ 13 causes the coil 11 to unwind and drag the joint heat-welded 19 on retaining pliers 24. Clamping pliers 25 of the four arms 22 are separated, as well as the jaws 27 of soldier. The other positioning member 14 remains motionless in position. low, without unwinding the coil 12.

In the step of FIG. 3, the winding and storage of a predetermined length of wrap 17 around the motorized roller 23 which rotates clockwise is involved. The positioning member 13 is lowered again in the direction of the low position, and the clamps 25 of the four arms 22 engage between the bellows of the casing 17. On the sheathing position 26, a previous AC load is completely wrapped by a sheath FU, which has previously been prepared and transferred by the transfer and accumulation device 15. Said packed AC load is then evacuated on the table 36 towards a lower position in which the heat shrinkage operation is performed. It is also possible to provide a hot air retraction frame around the load to effect heat shrinkage at the holster, as described in the document.
EP-A-1060988.

In Figure 4, a new AC load is moved to table 36 to be wrapped by the cover in preparation on the roller 23 of position 10. The storage arm 37 has been raised by translation on top of the load CH object of packaging, with a cross-centering of pick-up fingers 38. The jaws 27 of soldier approach each other to effect a new union heat-welded 19 that will be used to make a new cover.

In figure 5, the cutting device 28 has been operated to cut the FU sheath to the desired length, while jaws 27 remain in close position. He drive arm 31 moves horizontally towards the left on top of holster 26, and the translation of transfer carriage 30 ensures the exact placement of the roller 23 above the reservoir arm 37. The four swingarms 22 they are operated towards the separated position to cause the opening of the lower free end of the cover FU. Said end of the FU sheath is then picked up by fingers 38 of the arm of tank 37, which are separated to be placed under the tweezers 25 of the arms 22. At that stage, the roller 23 is motorized in the direction of winding.

In Figure 6, the retaining clip 24 of the roller 23 is open to release the welded joint 19 of the FU cover. Deposit arm 37 starts its downward movement to progressively wrap the AC load with the FU sheath, while that the arms 22 remain in a separate position while maintaining the cover separated by its four angles. The soldier jaws 27 and the cutting device 28 returns to the rest position.

In Figure 7, the FU case has abandoned the clamps 25 of arms 22 and reservoir arm 37 arrives at the bottom of the AC load to the holster 26. Drive arm 31 and carriage 30 return to the right above the preparation station 10, and the arms 22 are operated towards the retracted position. The support 33 moves in translation to the left along the crossbar 35, so which selects the positioning member 14 associated with the second coil 12. In this way the positioning member 14 can be driven towards up without waiting for the final return of the transfer device  and accumulation 15.

In Figure 8, the AC load is fully packed by the cover FU, and the placing organ 14 is in high position causing the insertion of the welded joint 19 in the retaining clip 24 of the accumulator roller 23. The other organ setter 13 is on hold in low position.

In Figure 9, the reservoir arm 37 is in the course of the relay, and the device 15 ensures the winding and storing a predetermined length of wrap 17 around the rotating roller 23. The laying organ 14 goes down again during this winding phase of the envelope.

The sequence of the operating sequence illustrated in figures 10 to 18 is made with a wrapper of extensible film In that case, the organs of the post of Preparation 10 of the FU sheath are identical to those in Figures 1 to 9. The structure of the deposit arm 37 at the post of sheathed is different, and behaves instead of the fingers of shaping and clamping 38 folding fingers and extension 39 associated with motorized wheels 40. Unlike than with the heat shrink film, the placement of a wrap extensible does not need any heat source to ensure the heat shrinkage, since it is enough to extend mechanically previous the matter of the plastic film in a transverse direction horizontal before wrapping the palletized cargo object of packaging. After depositing the extended cover over the load, tighten of the material of the extensible film is made naturally by elasticity, which keeps the case firmly around load. Each finger 39 is mounted on a control organ 41 dragged by an actuator of the type cat or geared motor in a direction that is confused with the diagonal of the load AC.

In figure 10 corresponding to the sequence following figure 9, the placing organ 14 continues its downward movement towards the low position, and a new AC load packing object is transferred on table 36 of the post of sheathed The reservoir arm 37 is raised in translation above the AC load, with transverse centering of the folding fingers 39. Wheels 40 are separated from fingers 39, and the envelope 17 leaving the coil 12 is wrapped around the accumulator roller 23.

In Figure 11, the soldier jaws 27 are approach each other to effect a new heat-welded joint 19, and the roller assembly 23 and tilting arms 22 remains immobilized on the jaws 27 until the intervention of cutting device 28.

In figures 12 and 13, the arm of drive 31 moves horizontally to the left above the holster 26. The transfer car 30 is also moves in the same direction to ensure placement Exactly of roller 23 on top of reservoir arm 37. The four tilting arms 22 are operated towards the separate position to cause the opening of the lower free end of the cover FU.  The fingers 39 of the reservoir arm 37 are separated to be placed under the clamps 25 of the swinging arms 22.

Figures 14 and 15 show the folding phase and accumulation of the FU sheath over the lower part of the fingers 39. Accordion folding of the FU case intervenes after rotation of the motorized wheels 40 that are in contact with the four fingers 39.

In figure 16 the extension is involved transverse of the folded cover FU after the maximum separation of the control elements 41 of the fingers 39. The wheels 40 do not rotate during this phase of transverse extension of the sheath FU, which is tense with an elongation index greater than 30%.

In figures 17 to 22, the movement of lowering of the reservoir arm 37 causes progressive deployment of the FU sheath around the AC load. Drive arm 31 and carriage 30 return to the preparation position 10, and the arms 22 are actuated towards the retracted position. At the beginning of return path (figure 17), the two positioning bodies 13, 14 are both in low position. The tour followed by return of accumulator element 20 is effected by a movement of transverse sliding (figure 18) and the swingarms 22 pass to both parts of the placing organs 13, 14 (figure 19). In this way the positioning member 14 can move towards up to a waiting position (figure 20), located just in front of the high end of travel position. When the roller accumulator 23 and retention clip 24 arrive in front of the film held by positioning member 14 in position intermediate waiting (figure 31), just raise the organ 14 towards the high position (figure 22) of insertion of the union heat-welded film 19 on retaining pliers 24. This upward travel between the intermediate waiting position and the high position is very short, and allows to improve the cadence of the packing machine

The time gain corresponds to the duration of the ascent route of a placement organ 13 or 14 between the low position and the intermediate waiting position.

Figure 23 represents a variant of the accumulator element 20 of device 15, in which roller 23 Rotary is replaced by a mobile roller system.

Instead of using a single device transfer and accumulation 15 as represented in the Figures 1 to 22, the packing rate of the machine can be further increased by using two accumulator systems with alternate movements

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References cited in the description

This list of references cited by the applicant only intends to help the reader and not form  part of the European patent document. Although he has put on a great careful in its conception, the absence of errors and the EPO declines all responsibility in this regard.

Patent documents cited in the description

EP1060988A [0002] [0009] [0016] [0030]

EP395919A [0003]

EP1106507A [0004]

Claims (18)

1. Training and deposit procedure for a packing cover (FU) on a palletized load (CA), being said cover prepared from a plastic wrap flexible wound on at least one coil (11, 12) of storage, procedure consisting of:

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Weld transversely the envelope (17) at its free end to create a heat-welded joint (19) held in a low position by the less a placement organ (13, 14),

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store on a device transfer and accumulation (15) a predetermined length of wrap and cut the wrap crosswise to constitute said sheath (FU),

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pick up the lower free end and lower the cover (FU) around the load (CA) object of packaging, keeping it separated by its four angles,

and characterized by the following intermediate stages consisting of:

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move the positioning organ (13, 14) vertically upwards dragging the envelope (17) to a high position of the thermo-welded joint (19) in the transfer and accumulation device (15),

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move the device horizontally transfer and accumulation (15) according to a single movement horizontally directed orthogonally with respect to displacement of the placing organ (13, 14) to ensure the end collection bottom of the case (FU),

2. Procedure for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 1, characterized in that during the return path of the transfer and accumulation device (15), the placing organ ( 13, 14) moves to an intermediate standby position located just in front of said high film collecting position in the accumulator element (21). 3. Procedure for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 1, characterized in that a thermo-shrinkable plastic wrap is used to make the sheath (FU). 4. Procedure for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 1, characterized in that an extendable plastic wrap is used to make the sheath (FU). 5. Procedure for forming and depositing a packing sheath (FU) on a palletized load (AC) according to claim 3 or 4, characterized in that a wrapping with double V bellows rolled flat on at least one coil is used (11, 12). 6. Procedure for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 3 or 4, characterized in that a tubular shell without bellows is used rolled flat on at least one coil (11 , 12). 7. Training and deposit device of a packing sheath (FU) on a palletized (CA) load, preparing  said sheath from a flexible plastic wrap rolled flat on at least one coil (11, 12) of storage, and comprising:

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some welding and cutting means (16) of the envelope,

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a transfer and accumulation device (15) comprising a accumulator element (20) on which a part of the envelope (17), and a separation mechanism (21) from the end open the envelope after transfer to the post of sheathed (26),

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to the minus a positioning member (13, 14) disposed between the coil (11, 12) and the accumulator element (20) for the maintenance of the wrap (17),

characterized in that the positioning member (13, 14) is movable in height at the preparation station (10), being coupled to an actuator (13a, 14a) so that the casing (17) moves between a low position and a position high coupling of the heat-welded joint (19) in the accumulator element (20). 8. Forming and depositing device of a packing sheath (FU) on a palletized load (CA) according to claim 7, characterized in that the transfer and accumulation device (15) is rotatably mounted on a vertical axis (29 ) of a drive arm (31) to place the heat-welded joint (19) in parallel or perpendicular to the larger face of the load (AC). 9. Device for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 7, characterized in that the positioning member (13, 14) is guided in vertical translation between a low position, a position intermediate standby and a high position by a guide rod (13b, 14b) attached to a support (33). 10. Device for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 9, characterized in that the support (33) is adjustable on a horizontal crossbar (35) attached to the frame (32) and it is provided with two positioning members (13, 14) that can be placed alternately in front of the accumulator member (20) by means of a horizontal movement of the support (33). 11. Device for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 10, characterized in that the support (33) of the two positioning members (13, 14) is mounted on a gangway (34) fixed to the frame (32) under the crossbar (35). 12. Forming and depositing device of a packing sheath (FU) on a palletized load (CA) according to claim 10 or 11, characterized in that the placing members (13, 14) maintain wrappers (17) that come out of two coils (11, 12) superimposed. 13. Device for forming and depositing a packing sheath (FU) on a palletized load (AC) according to claim 12, characterized in that the axis of the coils (11, 12) extends parallel to the maintenance transport. 14. Device for forming and depositing a packing sheath (FU) on a palletized load (AC) according to claim 12, characterized in that the axis of the coils (11, 12) extends perpendicular to the maintenance conveyor. 15. Device for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 7, characterized in that the transfer and accumulation device (15) is moved by a transfer carriage (30) associated with a drive arm (31) to ensure horizontal displacement of the sheath (FU) between the preparation station (10) and the sheathing post (26) before being picked up by a reservoir arm (37). 16. Device for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 15, characterized in that the reservoir arm (37) is provided with shaping and clamping fingers (38) for collect the open part of a sheath (FU) of heat shrinkable plastic film from all four angles. 17. Device for forming and depositing a packing sheath (FU) on a palletized load (CA) according to claim 15, characterized in that the reservoir arm (37) is provided with folding and extension fingers (39) intended to successively ensure the accordion folding of the sheath (FU) of stretch plastic film after the rotation of motorized wheels (40), followed by a transverse extension through the four angles before descending around the load (CA). 18. Forming and depositing device of a packing sheath (FU) on a palletized load (CA) according to claim 11, characterized in that the two positioning bodies (13, 14) are associated with a pair of transfer devices and accumulation (15) with alternate movements to increase the packing rate of the machine.