EP0322575A2 - Presse pour fabriquer des briquettes creuses - Google Patents

Presse pour fabriquer des briquettes creuses Download PDF

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Publication number
EP0322575A2
EP0322575A2 EP88119845A EP88119845A EP0322575A2 EP 0322575 A2 EP0322575 A2 EP 0322575A2 EP 88119845 A EP88119845 A EP 88119845A EP 88119845 A EP88119845 A EP 88119845A EP 0322575 A2 EP0322575 A2 EP 0322575A2
Authority
EP
European Patent Office
Prior art keywords
press
tube
compression
press according
mandrel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88119845A
Other languages
German (de)
English (en)
Other versions
EP0322575A3 (fr
Inventor
Rolf Hatlapa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hansa Anlagenbau & Co KG GmbH
Original Assignee
Hansa Anlagenbau & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hansa Anlagenbau & Co KG GmbH filed Critical Hansa Anlagenbau & Co KG GmbH
Publication of EP0322575A2 publication Critical patent/EP0322575A2/fr
Publication of EP0322575A3 publication Critical patent/EP0322575A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/224—Extrusion chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/26—Extrusion presses; Dies therefor using press rams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams

Definitions

  • the invention relates to a press according to the preamble of claim 1.
  • a press for producing briquettes from wood chips, tree bark and other biomass which has a cylindrical plunger which presses a supplied amount of biomass through a cone-shaped tube. This compresses and then the compacted material is pressed through a cooling and braking pipe, in which it is smoothed before being poured out.
  • the biomass is compressed radially from the outside inwards.
  • the wall friction in the tube and the pressure of the tappet push generate a temperature increase of the biomass which supports the briquetting process, which unlocks its molecules and takes away the elasticity which would impair the solidification of the briquette strand.
  • the radial compression by the narrowing of the cone tube can only take place inadequately, because the pre-compressed biomass, which is under increasing radial pressure, forms supporting arcs that prevent the radial thrust from penetrating disabled to the middle of the strand.
  • the inner parts With larger diameters of the briquette strand, it cannot fail to appear that the inner parts have less density and that less heat coming from the outer parts reaches the middle. As a result, the homogeneous cohesion of the briquettes suffers.
  • the object of the invention is to provide a press which ensures a uniform density and durability of the briquettes produced with reduced drive power of the ram drive.
  • the main advantages achieved with the invention are that by designing the plunger with a mandrel of smaller diameter, which extends with its tip into the narrowest zone of the compression tube, a secondary compression of the biomass is directed partially or completely radially from the inside to the outside he follows.
  • the briquette strand has a central bore from the mandrel tip of the corresponding diameter, so that after cutting the strand into individual pieces, hollow briquettes of high specific weight are formed, which are round, square, for example, depending on the cross-sectional shape of the press tube or can have triangular outer shapes.
  • a conical mandrel of about a third of the tappet diameter at the foot and about a quarter of the tappet diameter at the front end is placed on the center of the tappet end face, the length of which extends into the narrowest zone of the cone tube.
  • that of the compression mandrel can be reduced.
  • the press tube can be designed without taper.
  • the press tube can also be inserted into the tool holder with a constant rectangular or triangular internal cross section. whereby it must be secured against rotation.
  • the circumference of the tappet tip is flattened rectangular or triangular over the length of the immersion depth of the tappet in the press tube, while the larger rear part of the tappet retains the circular cross-section and its passage to the drive housing can be easily sealed.
  • the compression mandrel heats up during its work and requires heat dissipation, which takes place via the plunger, its clamping and its guidance. Since the path of the heat flow from the thermally particularly stressed mandrel tip to the clamping is very long, the cross section of the mandrel is relatively small and the thermal conductivity of steel is not sufficient for the heat conduction, a heat-dissipating aid, for example one in a central bore of the Mandrel pressed copper rod, which is inserted into the plunger, or a filling of the mandrel with sodium provided.
  • a heat-dissipating aid for example one in a central bore of the Mandrel pressed copper rod, which is inserted into the plunger, or a filling of the mandrel with sodium provided.
  • the filling of the cavity which is periodically released and displaced by the tappet, is supported by the fact that the tappet stroke is dimensioned large enough to give the end face of the tappet also a backward immersion depth, whereby firstly biomass is sucked into the uncovered tappet path and secondly a sufficient time cross section for the Entry of the subsidized biomass into the ram is created.
  • the biomass that got into the ram in the short period of its opening has a more or less large amount of air.
  • a vent hole inserted just before the opening of the press tube in the upper wall of the chip chamber ensures that the air portion escapes from the tappet path when the end face of the tappet moves the biomass in the direction of the press tube.
  • a valve-like device in the connected ventilation pipe prevents additional air from being sucked into the tappet path when the tappet returns.
  • the ram press essentially comprises an oscillatingly driven ram 1, which is arranged opposite a press tube 2 and which is preceded by a chip chamber 21.
  • This chamber 21 is equipped with feed chutes 19, 20, in which screw conveyors 22 are arranged, which feed the chamber 21 with biomass from two opposite sides.
  • a vent line 30 with a valve 24 is arranged in the top wall 23 of the chamber 21, directly in front of the inlet opening of the press tube 2 and above the ram movement path 20.
  • the plunger comprises a shaft 1a, which is guided in the drive housing 14 and is round in cross section, to which a plunger head 12 adjoins, which is on its end face 5 is connected to an axially projecting mandrel 8. This has a smaller diameter than the plunger head 12 and is moved into the pressing tube 2 during a pressing process, where it compresses the biomass carried out of the chamber 21 radially and axially into briquettes.
  • the press tube 2 can have a polygonal cross section, such as triangular, quadrangular or the like, it being pyramid-shaped and narrowing in the pressing direction of the plunger 1.
  • a further tube is provided, which has the end cross section 9 of the press tube 2 and is designed as a cooling tube 3, from which the briquette strand provided with a central opening 15 emerges through an opening 6.
  • the mandrel 8 is preferably conical over the length of the immersion depth in the press tube 2.
  • the subsequent plunger head 12 is square. This has in the press tube an approximately correspondingly square receiving space 4a with the inlet opening 4, into which the head 12 is immersed during a pressing process.
  • the mandrel 8 can also have a cross-sectional shape that is congruent to the press tube 2, i.e. in the case of a quadrangular inner cross section of the press tube 2, the mandrel 8 is also quadrangular in cross section.
  • the press tube 2 can also be designed conically, the mandrel 8 then having a corresponding conical shape.
  • the press tube 2 has a polygonal cross section with a cross-sectional area that is constant over its length, and that the mandrel has a cross-sectional area corresponding to this shape.
  • the stroke of the plunger 1 should have such a dimension that enough biomass can be conveyed around the mandrel 8 so that the mandrel 8 is evenly radially loaded during the pushing for pressing.
  • the stroke of the plunger 1 should be longer than the width of the loading shaft 19 of the chamber 21.
  • a highly thermally conductive material is embedded therein, which e.g. consists of a central copper strand 18 or a sodium filling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Processing Of Solid Wastes (AREA)
EP88119845A 1987-12-30 1988-11-29 Presse pour fabriquer des briquettes creuses Withdrawn EP0322575A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3744485 1987-12-30
DE3744485 1987-12-30

Publications (2)

Publication Number Publication Date
EP0322575A2 true EP0322575A2 (fr) 1989-07-05
EP0322575A3 EP0322575A3 (fr) 1990-05-30

Family

ID=6343821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119845A Withdrawn EP0322575A3 (fr) 1987-12-30 1988-11-29 Presse pour fabriquer des briquettes creuses

Country Status (1)

Country Link
EP (1) EP0322575A3 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE148227C (fr) *
DE96004C (fr) *
FR629106A (fr) * 1927-02-14 1927-11-04 Buhler Freres Presse pour la fabrication de conglomérats creux
US2833633A (en) * 1955-01-10 1958-05-06 John R Hecht Apparatus for forming logs of compressible materials
FR2366929A1 (fr) * 1976-10-06 1978-05-05 Wetstein Leon Presse pour l'agglomeration des dechets
US4436526A (en) * 1982-06-25 1984-03-13 Hmvh Corporation Method for making an artificial fuel log
US4599091A (en) * 1984-09-14 1986-07-08 Lee Andrew O Briquette forming apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE148227C (fr) *
DE96004C (fr) *
FR629106A (fr) * 1927-02-14 1927-11-04 Buhler Freres Presse pour la fabrication de conglomérats creux
US2833633A (en) * 1955-01-10 1958-05-06 John R Hecht Apparatus for forming logs of compressible materials
FR2366929A1 (fr) * 1976-10-06 1978-05-05 Wetstein Leon Presse pour l'agglomeration des dechets
US4436526A (en) * 1982-06-25 1984-03-13 Hmvh Corporation Method for making an artificial fuel log
US4599091A (en) * 1984-09-14 1986-07-08 Lee Andrew O Briquette forming apparatus

Also Published As

Publication number Publication date
EP0322575A3 (fr) 1990-05-30

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