Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
  • B26D3/16—Cutting rods or tubes transversely
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
  • B23D45/18—Machines with circular saw blades for sawing stock while the latter is travelling otherwise than in the direction of the cut
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
  • B26D1/60—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is mounted on a movable carriage
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/355—Conveyors for extruded articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
  • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
  • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
  • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/92—Measuring, controlling or regulating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/01—Means for holding or positioning work
  • B26D2007/013—Means for holding or positioning work the work being tubes, rods or logs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2793/00—Shaping techniques involving a cutting or machining operation
  • B29C2793/0027—Cutting off
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2793/00—Shaping techniques involving a cutting or machining operation
  • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2948/00—Indexing scheme relating to extrusion moulding
  • B29C2948/92—Measuring, controlling or regulating
  • B29C2948/92504—Controlled parameter
  • B29C2948/9258—Velocity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2023/00—Tubular articles
  • B29L2023/22—Tubes or pipes, i.e. rigid
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

• the invention relates to a device for separating plastic products, in particular extruded plastic pipes, comprising at least one first extraction device with at least two extraction caterpillars, a separating unit which comprises at least one separating device with at least one separating means, by means of which plastic products can be separated to a predetermined length, and a related device Proceedings.
• So-called flying saws are usually used to cut extruded pipes to length, whereby a circular saw blade is brought up to the pipe to be cut either from below (underfloor saw), from above (plunge saw) or from the side (crosscut saw), dips into the cross-section of the pipe and cuts cut through the wall thickness in the first step.
• the saw blade is guided around the pipe to cut the pipe completely to length.
• the pipe to be cut to length is clamped during the sawing process; the saw carriage or saw carriage then moves synchronously with the continuously running extrusion process at the extrusion speed (“flying saw”).
• DE 102013220622A1 describes a device for cutting a thick-walled extruded pipe to length, with at least one cutting tool and a receiving unit for the cutting tool, the cutting tool being movable radially to the extrusion axis and using other means the pipe to be cut to length can be rotated around it in order to cut the pipe to length
• the receiving unit comprises two toothed racks arranged in a block, the first toothed rack being movable back and forth parallel and the second toothed rack radially to the extrusion axis and on the second toothed rack
• the Separating tool is arranged and the ring element can be moved via an axial drive and the penetration depth of the separating tool and the travel path can be determined by means of an adjustment unit and the receiving unit is connected to a receiving disc and a sleeve, with linear guides on the sleeve elements are arranged parallel to the extrusion axis, with at least four linear
• the object of the invention is to further develop the known devices and methods in such a way that it is no longer necessary to move the separating device, so that they can work more effectively and energy is saved, and the systems can therefore be operated in a more environmentally friendly manner.
• the cutting unit comprises at least one bead with at least one cutting tool, with at least one tool being arranged on one of the beads, with at least one in the tool Separating agent is arranged by means of which the plastic products can be separated.
• the separating means are advantageously arranged inside the tool and can be rotated around the plastic product to be separated during the separating process. As a result, the separating process can be completed more quickly than if the separating agent had to run through the entire cross section of the plastic product.
• the tool is designed in such a way that it encloses the plastic product to be separated in a U-shape during the separation process.
• This U-shaped enclosing has the advantage that the parting agent not only engages in the plastic product at one point, but that several parting agents can carry out the parting process at the same time distributed at several points around the circumference.
• the cutting tool can be moved with the bead at its speed. This means that the cutting tool is firmly connected to the bead. As a result, the cutting process can be completed at take-off speed.
• Another bead advantageously supports the plastic product during the cutting process. This means that during the cutting process, it is transverse to the direction of extrusion, ie radially applied separating force is counteracted, whereby excessive sagging or bending of the plastic product is avoided, which in turn contributes to improving the course of the cut on the plastic product.
• the plastic product is preferably fixed radially by means of the beads.
• the cutting process takes place in a time window in which the cutting tool arranged on the bead is in contact with the plastic product, the time window being defined by the length of the contact surface of the bead with the plastic product.
• the axial length of the bead in conjunction with the take-off speed, therefore determines the time window in which the cutting process must be completed. Since the separating tool is moved at the take-off speed with the bead, the separating tool is brought out of contact with the plastic product as soon as the separating tool leaves the contact area between the bead and the surface of the plastic product.
• Figure 1 shows a typical extrusion line
• FIG. 3 is an enlargement of Figure 2
• Fig. 5 is an addition to Figure 2
• Fig. 6 is an addition to Fig. 4
• Figure 1 shows a typical extrusion line as it is used today for profile extrusion, whether for the production of window profiles or pipes. It shows an extruder 1 in which plastic is melted and is continuously fed into the extrusion die 2 for shaping. This is followed by a calibration and cooling station 3, further cooling stations can be used depending on the profile. After the cooling stations, a first extraction unit 4 follows. In order to cut the endless profiles 7 to the desired length, a separating device 5 is then arranged. This is followed by a further extraction unit 6. The extrusion axis is marked with the position number 8.
• FIG. 2 shows the parts of the device that are involved in the separation process.
• the first extraction unit 4 includes two extraction caterpillars 12, but several caterpillars can also be arranged in one extraction unit, which extract the plastic product 7 from the calibration and cooling tank 3 and convey the separating unit 10 in the extrusion direction Hin.
• the separating unit 10 consists of a bead 14 on which the separating tools 13 are arranged. During the separating process, one separating tool 13 encompasses the plastic product 7 and carries out the separating process, while the plastic product 7 continues to be conveyed through the separating unit 10 . After the cutting process, the cutting tool 13 is disengaged.
• separating tool 13 can carry out the next separating process.
• Another bead 16 is provided to support the plastic product 7 during the cutting process. The separating process is completed before the separating tool 13, which is arranged on the bead 14, leaves the contact surface between the bead 14 and the plastic product 7 again. This contact length 17 is reproduced purely schematically.
• FIG. 3 shows an enlargement of FIG. 2, in which the bead 14 with a separating tool 13 can be seen.
• the separating tool 13 comprises a separating means 15 rotating around the plastic product 7, which is symbolized by the arrow.
• the separating tool 13 runs in the extrusion direction 11 at the extrusion speed v.
• the separating means 15 does not necessarily have to rotate around the plastic product 7; the separating can also be done by simply pressing it into the soft plastic mass or by clamping it with a saw.
• FIG. 4 shows a section through the separating unit 10 transversely to the extrusion axis 8.
• the plastic product 7 is supported, conveyed and cut to length by means of three caterpillars.
• Separating tools 13 are arranged on the caterpillar 14 and run at the same speed as the caterpillar 14 .
• Two further caterpillars 16 are provided both for supporting and for transporting the plastic product 7 .
• FIG. 5 corresponds to FIG. 2 with the same reference numerals.
• FIG. 5 differs only in that a double arrow is shown on bead 16 and bead 14, which is intended to show schematically that bead 16 and bead 14 can be moved toward or away from the center point of the pipe and thus extrusion axis 8 . This makes it possible to adjust the device to different pipe diameters. This is additionally illustrated in FIG.
• FIG. 6 corresponds to FIG. 4 and also has the same reference numerals.
• the beads 14 and 16 were each provided with a double arrow to indicate the possible movement of the beads to the center of the extruded tube.
• a smaller diameter tube was shown as a knitted dotted line.
• the caterpillar 14 with the separating tools 13 can also act as a support.
• rollers 18 are arranged on the caterpillar 14, as shown schematically in FIG. 2, so that both support and unrestricted transport of the plastic product 7 are ensured. Otherwise the caterpillar 14 could jam at different speeds. In this way, rolling on the plastic product 7 is ensured at all times.
• the machine control can regulate the speed depending on the cutting length required, as well as the number of cutting tools 13 on the bead 14 and the length of the contact surface 17.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=77155791

Family Applications (1)

Country Status (3)

Family Cites Families (28)

• 2021
  • 2021-07-21 EP EP21748865.9A patent/EP3969236A1/de active Pending
  • 2021-07-21 CN CN202180004649.9A patent/CN114302798B/zh active Active
  • 2021-07-21 WO PCT/EP2021/070571 patent/WO2022028911A1/de unknown

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