EP0085318B1 - Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material sowie deren Verwendung - Google Patents

Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material sowie deren Verwendung Download PDF

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Publication number
EP0085318B1
EP0085318B1 EP83100273A EP83100273A EP0085318B1 EP 0085318 B1 EP0085318 B1 EP 0085318B1 EP 83100273 A EP83100273 A EP 83100273A EP 83100273 A EP83100273 A EP 83100273A EP 0085318 B1 EP0085318 B1 EP 0085318B1
Authority
EP
European Patent Office
Prior art keywords
channel
plates
frequency generator
walls
condenser plates
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.)
Expired
Application number
EP83100273A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0085318A1 (de
Inventor
Eckhard Schulz
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.)
Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG
Original Assignee
Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG
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 Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG filed Critical Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG
Priority to AT83100273T priority Critical patent/ATE29641T1/de
Publication of EP0085318A1 publication Critical patent/EP0085318A1/de
Application granted granted Critical
Publication of EP0085318B1 publication Critical patent/EP0085318B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/60—Arrangements for continuous movement of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
    • B28B5/027—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of the indefinite length type, e.g. belts, and being continuously fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S198/00—Conveyors: power-driven
    • Y10S198/952—Heating or cooling

Definitions

  • the invention relates to a device for heating a strand of electrically conductive material according to the preamble of claim 1 and its use for the production of blanks for building materials, in particular wall blocks.
  • the heating chamber of this device cannot easily be replaced by capacitor plates which are connected to a high-frequency generator, since the emerging strand would be at potential and would also radiate like an antenna.
  • FR-A-2 308 479 or DE-A-1 683 991 it is known from FR-A-2 308 479 or DE-A-1 683 991 to use a channel for the production of gypsum boards, which consists of four synchronously driven belts and can be filled via a filling funnel.
  • the filled raw mixture is not heated, rather the plaster is allowed to harden in order to be able to remove the finished plate.
  • This requires a corresponding length of the channel or a sufficiently long period of time for the mixture to remain in the channel.
  • the use of a high-frequency field for heating is not possible because of the material of the strips, which are at least partially made of metal, because of the short circuit that then occurs.
  • the object of the invention is to provide a device according to the preamble of claim 1, in which the strand emerging from the channel is grounded and does not radiate.
  • the 1 comprises four belts 10, 11, 12 and 13 which are arranged such that they form a rectangular channel 14 between them.
  • the belts 10 to 13 are guided around rollers 15 and driven synchronously by means of a drive, not shown.
  • the tapes 10 to 13 are further supported, if necessary, adjacent to the channel 14 by support gratings, not shown, while the vertical tapes 12 and 13 can additionally be guided at their edges via slide rails.
  • the lower horizontal belt 10 is extended beyond the outlet end of the channel 14 and guided to the belt running control via a dancer roll 16.
  • a filling funnel 17 opens between the belts 10 to 13 in the inlet area of the channel 14, which is expediently arranged such that it can be moved out of the inlet area of the channel 14 by means of a piston-cylinder unit for cleaning purposes.
  • the outlet opening of the filling funnel 17 is located in the inlet area of the channel 14.
  • a cutting device 18 is provided, which in the feed direction of the band 10 from an initial position synchronously with the feed Speed of the belt 10 can be moved and can be moved back into the starting position after the cutting process has been carried out.
  • the cutting device 18 has in the embodiment shown a bracket 19, a cutting wire 19 a reciprocating and adjustable in the vertical direction according to the cutting progress and receives and can be moved with a carriage 20.
  • a belt weighing section can be provided downstream of the cutting device 18.
  • the tapes 10 to 13 are preferably made of an electrically non-conductive plastic, while adjacent to the tapes 12 and 13, namely on the outside of the tape parts that form the entrance area of the channel 14, a capacitor plate arrangement 21 is provided, which is connected via corresponding lines 22 are connected to a high frequency generator 23.
  • a raw mixture for example consisting of quartz sand, lime, water, cement with accelerator and foam for the production of lime silicate stones
  • the raw mixture reaches the channel 14 and is held on the predetermined channel cross section by the belts 10 to 13.
  • the raw mixture in the duct 14 is heated, for example, to a temperature of 50 ° C. via the capacitor plate arrangement 21, so that the raw mixture solidifies due to the strengthening reactions of the cement that are set in motion.
  • the pressure build-up in the foam pores of the raw mixture can then take place correspondingly more slowly.
  • the raw mixture can also expand in the direction of the filling funnel 17 during the heating, it being expedient to always maintain a substantially constant level of raw mixing in the filling funnel 17, so that the pressure exerted thereby on the solidifying strand located in the channel 14 in the remains essentially constant.
  • the solidifying strand of raw mixture in channel 14 is conveyed through belts 10 to 13 to the outlet end of channel 14. A relative movement between the strand and the tapes 10 to 13 and between the tapes 10 to 13 does not take place here, so that the wear problems are minimal.
  • the tapes 10 to 13 are sprayed with a release agent by spray devices 24 before they are deflected to the channel 14.
  • scrapers 25 are provided, which remove any adhering material from the belts 10 to 13.
  • the solidified strand After the solidified strand emerges from the channel 14, it is transported further through the lower belt 10 and divided into individual stone blanks 26 by means of the cutting device 18.
  • the separated stone blanks 26 can then optionally be weighed on a belt weighing line, in order to be able to readjust the composition of the raw mixture in this way, in order to achieve the most uniform possible body density of the stone blanks 26.
  • the waste heat from the high-frequency generator 23 can be used by blowing warm air generated by the generator cooling, for example by means of a hood, onto the stone blanks 26 in order to harden them, so that these have a sufficiently high strength for subsequent transport to an autoclave, but they do not must be fully generated by capacitive heating.
  • the length of the channel 14 is dimensioned such that the emerging strand has a desired strength, which may be increased to the necessary value by reheating with warm air from the generator cooling or another heat source.
  • the area of the channel 14 is expediently accommodated in a housing, not shown, which extends from the hopper 17 to the cutting device 18.
  • the belts 10 to 13 with their rollers 15 as well as support gratings and sliding guides can be adjusted with respect to their belt levels so that the cross section of the channel 14 can be changed.
  • the length of the blanks 26 can be changed by the cycle of the cutting device 18.
  • the feed rate of the belts 10 to 13 is expediently adjustable, in particular continuously adjustable, in order to be able to adapt the feed rate to the heating rate and the size of the capacitor plate arrangement 21 accordingly.
  • the belt strand system is suitable, for example, for the production of blanks for wall building blocks, in particular lightweight building blocks, for example based on lime silicate, gas or foam concrete or from coarse-ceramic material, the raw mixture containing large proportions of foam and water, so that cullet densities down to 0.2 g / cm 3 can be achieved.
  • the generator power can be used optimally.
  • the capacitor plate arrangement 21 shown in FIG. 2 comprises two capacitor plates 30, one each on an outside of the band 12 or 13, which are offset from one another by at least approximately their length and are connected to the ungrounded connection of the high-frequency generator 23 (by “+” indicated).
  • two further capacitor plates 31 are arranged adjacent to each of them on the outside of the band 12 and 13, respectively, which are connected to the grounded connection of the high-frequency generator 2 3 are connected (indicated by «-»).
  • the capacitor plates 31, 32 extend so far along the channel 14 that the scattering field lines emanating from the capacitor plates 30 are absorbed by the capacitor plates 31, 32 on both sides thereof, so that the strand inside the channel 14 no longer extends outside the heating area Potential lies.
  • the capacitor plates 30, 31, 32 can serve as support elements for the bands 12, 13 at the same time.
  • the plates 33 are used to optimally adjust the capacitance of the capacitor plate arrangement 21 to the generator power.
  • the capacitor plates 30, 31 are adjustable in their spacing with respect to the adjacent belts 12, 13 by the adjacent sections of the belts by the capacitor plates 30, 31, the plates 33 and the air gap therebetween 12 and 13 and between the raw mixture formed multilayer capacitor in its capacity to match the power of the high-frequency generator 23 such that its resonant circuit operates as resonantly as possible.
  • the tapes 12 and 13 of the channel 14 expediently have a considerably lower dielectric constant and in particular a considerably lower product of the dielectric constant and loss angle than the raw mixture conveyed in the channel 14, so that the tapes 12, 13 remain practically cold and are not heated.
  • the capacitor plate arrangement 21 can also be arranged in the area of the filling funnel 17, which then has a corresponding length and must be made of the appropriate material.
  • the device enables true capacitive heating even with an electrically conductive raw mixture and a relatively high dielectric constant, with optimal use of the generator power, it also being possible to work with a reduced frequency, which simplifies the technical implementation.
  • a Jouie heating of the raw mixture is additionally delivered.
  • a high dielectric strength is obtained and the choice of generator voltage is less problematic.
  • the raw mixture can have a water and foam content of more than 50% by weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Resistance Heating (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Surface Heating Bodies (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Central Heating Systems (AREA)
  • Road Paving Machines (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP83100273A 1982-01-30 1983-01-14 Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material sowie deren Verwendung Expired EP0085318B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100273T ATE29641T1 (de) 1982-01-30 1983-01-14 Vorrichtung zum erwaermen eines strangs aus elektrisch leitfaehigem material sowie deren verwendung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3203131 1982-01-30
DE3203131 1982-01-30

Publications (2)

Publication Number Publication Date
EP0085318A1 EP0085318A1 (de) 1983-08-10
EP0085318B1 true EP0085318B1 (de) 1987-09-09

Family

ID=6154378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100273A Expired EP0085318B1 (de) 1982-01-30 1983-01-14 Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material sowie deren Verwendung

Country Status (7)

Country Link
US (1) US4514162A (ja)
EP (1) EP0085318B1 (ja)
JP (1) JPS58136404A (ja)
AT (1) ATE29641T1 (ja)
CA (1) CA1194559A (ja)
DE (1) DE3373606D1 (ja)
DK (1) DK156362C (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228615A2 (de) * 1985-12-10 1987-07-15 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material

Families Citing this family (23)

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DE3428936A1 (de) * 1984-08-06 1986-02-13 Continental Gummi-Werke Ag, 3000 Hannover Presse zum kontinuierlichen herstellen von bahnfoermigem pressgut
DE4141271C1 (ja) * 1991-12-14 1992-11-05 Sicowa Verfahrenstech
NL1009217C2 (nl) * 1998-05-19 1999-11-25 Boudewijn Johannes Geul Werkwijze en inrichting voor het vormen van kalkzandsteenproducten.
WO2002090081A1 (fr) * 2001-05-09 2002-11-14 Nissei Kabushiki Kaisha Procede de fabrication d'un objet forme a chaud, dispositif et procede de chauffage continu par haute frequence
EP1454726A1 (en) * 2001-11-16 2004-09-08 Associated Property Investments LLC Installation for producing reinforced concrete parts
DK1487240T3 (da) * 2003-06-13 2005-11-07 Wild Gmbh & Co Kg Rudolf Opvarmer til produktströmme
US7211206B2 (en) * 2004-01-23 2007-05-01 Century-Board Usa Llc Continuous forming system utilizing up to six endless belts
US7763341B2 (en) * 2004-01-23 2010-07-27 Century-Board Usa, Llc Filled polymer composite and synthetic building material compositions
CN101111353B (zh) 2004-06-24 2011-09-28 世纪-博得美国公司 用于三维泡沫产品的连续成型设备
ES2273579B1 (es) * 2005-06-21 2008-03-16 Carlos Fradera Pellicer Procedimiento para el tratamiento de elementos tecnicos que endurecen en el tiempo.
US20070013099A1 (en) * 2005-07-15 2007-01-18 Epoch Composite Products, Inc. Method And Apparatus For Emobssing Manufactured Deck Boards
US8138234B2 (en) * 2006-03-24 2012-03-20 Century-Board Usa, Llc Polyurethane composite materials
ITPS20070011A1 (it) * 2007-03-08 2008-09-09 Angelo Candiracci Procedimento e dispositivo per la produzione di blocchi di polistirolo espanso
US20090295021A1 (en) * 2008-05-27 2009-12-03 Century-Board Usa, Llc Extrusion of polyurethane composite materials
US9481759B2 (en) 2009-08-14 2016-11-01 Boral Ip Holdings Llc Polyurethanes derived from highly reactive reactants and coal ash
US8846776B2 (en) 2009-08-14 2014-09-30 Boral Ip Holdings Llc Filled polyurethane composites and methods of making same
AU2012318528A1 (en) 2011-10-07 2014-05-22 Boral Ip Holdings (Australia) Pty Limited Inorganic polymer/organic polymer composites and methods of making same
US9932457B2 (en) 2013-04-12 2018-04-03 Boral Ip Holdings (Australia) Pty Limited Composites formed from an absorptive filler and a polyurethane
US10138341B2 (en) 2014-07-28 2018-11-27 Boral Ip Holdings (Australia) Pty Limited Use of evaporative coolants to manufacture filled polyurethane composites
US9752015B2 (en) 2014-08-05 2017-09-05 Boral Ip Holdings (Australia) Pty Limited Filled polymeric composites including short length fibers
US9988512B2 (en) 2015-01-22 2018-06-05 Boral Ip Holdings (Australia) Pty Limited Highly filled polyurethane composites
US10030126B2 (en) 2015-06-05 2018-07-24 Boral Ip Holdings (Australia) Pty Limited Filled polyurethane composites with lightweight fillers
US20170267585A1 (en) 2015-11-12 2017-09-21 Amitabha Kumar Filled polyurethane composites with size-graded fillers

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228615A2 (de) * 1985-12-10 1987-07-15 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material
EP0228615A3 (en) * 1985-12-10 1988-06-08 Sicowa Verfahrenstechnik Fur Baustoffe Gmbh & Co. Kg Arrangement for heating a billet of electrically conductive material
EP0485363A2 (de) * 1985-12-10 1992-05-13 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material
EP0486472A2 (de) * 1985-12-10 1992-05-20 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material
EP0486472A3 (de) * 1985-12-10 1992-05-27 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material
EP0487504A1 (de) * 1985-12-10 1992-05-27 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Vorrichtung zum Erwärmen eines Strangs aus elektrisch leitfähigem Material
EP0485363A3 (en) * 1985-12-10 1992-05-27 Sicowa Verfahrenstechnik Fuer Baustoffe Gmbh & Co. Kg Device for heating a long product of electrical conductive material

Also Published As

Publication number Publication date
DK156362B (da) 1989-08-07
DK21883A (da) 1983-07-31
DK156362C (da) 1990-01-02
JPS58136404A (ja) 1983-08-13
EP0085318A1 (de) 1983-08-10
DE3373606D1 (en) 1987-10-15
CA1194559A (en) 1985-10-01
DK21883D0 (da) 1983-01-20
ATE29641T1 (de) 1987-09-15
JPH047285B2 (ja) 1992-02-10
US4514162A (en) 1985-04-30

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