Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
  • B65G21/20—Means incorporated in, or attached to, framework or housings for guiding load-carriers, traction elements or loads supported on moving surfaces
  • B65G21/2027—Suction retaining means
  • B65G21/2036—Suction retaining means for retaining the load on the load-carrying surface

Definitions

• the present invention relates to a transport device with a linear conveyor belt, which is suitable for conveying objects, such as films made of plastic or paper, without these being blown down by a draft.
• the objects that can be transported with the transport device according to the invention are, in particular, sheet-like materials such as plastic films or papers and also constituents of packaging materials which, for example, consist of embossed or pressed into a three-dimensional shape plastic films with a certain structural stability.
• packaging materials are inserts for biscuit packaging and packaging materials that are formed from plastic or paper films and have a certain stability to protect the packaged goods.
• the objects that are transported with the transport device according to the invention have in common that they are separated together in a wind sifter as a fraction when recyclable materials, such as those collected by the "Green Dot", are separated according to material properties. As a result, these objects become characterized by their shape as a large-area and relatively light part with similar flight characteristics in wind classifiers than by their material and can therefore also include composites or thin metal foils.
• EP 0 465 666 discloses a conveyor belt for transporting objects lying next to one another.
• the objects are held in place by negative pressure on permeable areas of the conveyor belt, the permeable areas extending as strips in the longitudinal direction of the conveyor belt and being separated from flow-tight areas which also run in the longitudinal direction of the conveyor belt.
• These permeable areas are formed by a grid that extends as a stabilizing element over the entire surface of the conveyor belt.
• the flow-tight areas are formed by forming elastic material, such as plastic, in areas along the band around the grid.
• the negative pressure can act on the objects to be transported through openings which are located in the outer wall of a vacuum container on which the conveyor belt rests, through the permeable regions of the conveyor belt.
• DE-OS 23 27 122 discloses a conveyor belt with which flat objects, such as veneer sheets, are held hanging during transport by suction air.
• flap-shaped closing elements are attached to the side of the conveyor belt which is opposite the side on which the objects are held and transported.
• EP 0 827 920 discloses a conveyor belt for hanging transportation of metal sheets, with which ferromagnetic materials are held in place with magnetic force and non-ferromagnetic materials can be held in place by an additional vacuum device.
• a vacuum blower is used to generate suction in the vacuum recesses of the conveyor belt, which pulls the non-magnetic sheets against a sealing layer of the conveyor belt.
• a Venturi nozzle is used to generate the negative pressure, which enables a negative pressure to be built up in a very short time.
• DE-OS 31 04 724 discloses a conveyor belt for transporting plates, belts, sheets or foils, the running surface being formed from belt sections lying in parallel in the longitudinal direction and the objects to be conveyed being held on the conveyor belt by a negative pressure applied from the opposite side ,
• the negative pressure is conveyed via a vacuum chamber attached below the conveyor belt, the wall of which on the side on which the conveyor belt lies has longitudinal slots parallel to the running direction. Through these longitudinal slots, the negative pressure can act on the objects to be transported through the gaps running in the belt direction between individual belt sections.
• the known conveyor belts are suitable for transporting objects which have sufficient structural stability so that they are not drawn into the openings formed in the conveyor belt by the negative pressure present. Furthermore, it is apparent from the above-mentioned disclosures that the suction of the objects to be transported is controlled by regulating the negative pressure force in such a way that objects are picked up or stored precisely in the hanging transport.
• Known conveyor devices that transport objects above the belt are usually used for transporting rather used objects that have a certain homogeneity in size, so that the suction force on the conveyor belt can be adjusted by a corresponding dimension of the continuous areas of the conveyor belt.
• the task arises to provide a transport device with a conveyor belt in which objects can be held and transported on the transport surface by means of negative pressure, even if these elements have different dimensions and a different structural stability.
• the present invention achieves this object by using a conveyor belt rotating in the linear direction, which has openings, for example bores, which run perpendicularly through the surface of the conveyor belt on which the elements to be transported rest. Elements lying on the conveyor belt are held on these surfaces by negative pressure, which acts through the openings in the conveyor belt.
• the vacuum container is essentially parallel to the conveyor belt, which runs along one of its surfaces and has longitudinal slots in this surface, which are arranged below the openings of the conveyor belt, so that air can be sucked through open openings in the conveyor belt through these longitudinal openings of the vacuum container.
• the conveyor belt is held by areas of the vacuum container surface, the carrier rails, running between the longitudinal slots. supports.
• the negative pressure in the vacuum container can be generated by conventional machines that supply negative pressure, such as pumps or blowers, which are connected to their inlet side.
• the conveyor belt has openings which lie in four to six longitudinal rows which run parallel to the running direction of the belt. It is further preferred that the holes have a diameter of approximately 10, 15, 20 or 30 mm and are circular.
• a friction-reducing coating or mechanical devices is suitable as a friction-reducing coating.
• a polyfluoropolymer such as Teflon, is suitable as a friction-reducing coating.
• Rollers or rollers which are rotatably mounted on the surface of the carrier rails opposite the conveyor belt are suitable as a friction-reducing mechanical component.
• Figure 1 shows a sectional view perpendicular to the direction of travel of the conveyor belt through a conveyor belt which is suitable for use in the transport device according to the invention.
• Figure 2 shows a plan view of an area of a conveyor belt that can be used in the transport device according to the invention.
• FIG. 3 shows a perspective side view of the vacuum container which can be used in the transport device according to the invention.
• FIG. 4 shows a cross-sectional view of the vacuum container according to FIG. 3.
• FIG. 5 shows a cross-sectional view of a further embodiment of a vacuum container which can be used in the transport device according to the invention.
• the direction of travel of the conveyor belt 10 above the vacuum container 20 is given as an example for the sake of clarity.
• the conveyor belt 10 consists of elastic material, for example synthetic rubber, which forms the impermeable region 11, which is interrupted by openings 12, for example holes.
• Below the conveyor belt 10 is the vacuum container 20, the outer surface of which, opposite the conveyor belt 10, consists of strip-like areas, the carrier rails 21, which are separated from strip-like interruptions, the longitudinal slots (not shown), the longitudinal slots and those lying between them Carrier rails 21 are arranged parallel to the transport direction of the conveyor belt 10.
• the carrier rails 21 serve to support the conveyor belt 10 and can have a friction-reducing coating or rollers or rollers attached therein in order to reduce the transport resistance of the conveyor belt 10.
• the vacuum is introduced into the vacuum region 23 of the vacuum container 20 by a compressor (not shown).
• the lower wall 24 closes the vacuum container 20 in one direction.
• FIG. 2 shows an exemplary arrangement of openings 12 through the impermeable material 11 of the conveyor belt 10.
• the openings 12 are designed here as bores which are arranged in rows parallel to the direction of transport of the conveyor belt 10.
• the openings 12 can be arranged regularly or irregularly on a gap in the rows.
• FIG. 3 shows the vacuum container 20 with carrier rails 21 which, together with the longitudinal slots 22 running parallel thereto, form the surface of the vacuum container 20 which lies opposite the conveyor belt 10.
• the side walls 25 and 25 ' are preferably aligned perpendicular to the plane which is formed by the carrier rails 21.
• the lower wall 24 is tightly connected to the side walls 25 and 25 '.
• the sectional view of FIG. 4 shows the carrier rails 21 of the vacuum container 20 with the longitudinal slots 22 lying therebetween.
• the side walls 25, 25 ' enclose the vacuum container 20 together with the lower surface 24.
• a compressor for applying the vacuum can be connected to a hose or tube Place or in several places with the vacuum container 20 in connection.
• FIG. 5 shows a further embodiment of the vacuum container 20, in which the carrier rails 21 are separated from longitudinal slots 22 which run parallel to the running direction of the conveyor belt 10.
• the vacuum area is divided into different individual vacuum areas 23 ', which are each closed off by the walls 24'.
• the negative pressure can be applied uniformly or to different degrees to the individual negative pressure regions 23 '.
• the profile of the impermeable boundaries 24 'of the vacuum regions 23' can also take on other geometrically simple shapes, such as a square or hexagon, as long as the cross section is sufficient to conduct a sufficient vacuum.
• the transport device according to the invention is particularly suitable for transporting flat objects, such as plastic films, paper and cardboard, since these objects are held at individual points, ie the openings 12 of the conveyor belt 10 by the negative pressure present.
• the objects can thus be transported by means of a conveyor belt without being blown down by air movement, the surface of the conveyor belt 10 on which the objects lie only having openings 12 which can impart sufficient suction, but not the objects further can pull in.
• the transport device according to the invention thus enables the transport of the objects without relative movement of the objects on the conveyor belt 10, so that the position of the transported objects depends on the running speed and direction of the conveyor belt 10.
• the transport device according to the invention is thus suitable for moving flat objects, such as plastic films, past a measuring system for their identification and recording the objects later, ie after moving at another point on the conveyor belt 10, in order, for example, to sort the objects as a function of them Identification.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Belt Conveyors (AREA)
• Structure Of Belt Conveyors (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7933791

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (1)

Citations (2)

Family Cites Families (2)

• 1999
  • 1999-12-22 DE DE1999161986 patent/DE19961986A1/de not_active Ceased
• 2000
  • 2000-11-02 AU AU54412/01A patent/AU5441201A/en not_active Abandoned
  • 2000-11-02 WO PCT/DE2000/003872 patent/WO2001046046A1/de active Application Filing
  • 2000-12-04 AR ARP000106421A patent/AR026717A1/es unknown

Patent Citations (2)

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