US3764242A - Apparatus for the production of green test specimens from artificial carbon - Google Patents

Apparatus for the production of green test specimens from artificial carbon Download PDF

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Publication number
US3764242A
US3764242A US00247359A US3764242DA US3764242A US 3764242 A US3764242 A US 3764242A US 00247359 A US00247359 A US 00247359A US 3764242D A US3764242D A US 3764242DA US 3764242 A US3764242 A US 3764242A
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United States
Prior art keywords
mass
plate
artificial carbon
counter
test specimens
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Expired - Lifetime
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US00247359A
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English (en)
Inventor
W Fischer
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Alcan Holdings Switzerland AG
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Alusuisse Holdings AG
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Publication date
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    • 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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/022—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space whereby the material is subjected to vibrations

Definitions

  • the apparatus is distinguished in that said counter-plate is pressable by means of an upper cylinder by oil pressure against the carbon mass by virtue of the installation of a nonreturn valve and a fine needle valve connected parallel therewith in the oil conduit in such a way that it can follow the variation of height of the compacting mass.
  • the present invention relates to an apparatus for the production of green (unfired, unbaked) test specimens from artificial carbon.
  • Very large artificial carbon bodies are frequently needed in industry. These are usually produced by firing (baking) of a granular mass of carbon-containing dry material with addition of cokable binding agent. According to the nature of the dry material (chemical and physical composition) and according to the binding agent, if one is used, also according to the manner of processing (for example by pressing or by vibration), according to pressure and the course of the firing temperature, artificial carbon bodies are obtained which have properties differing from one another.
  • test specimens in chill moulds by means of accessory compacting devices, such as pneumatic hammers, bench presses and the like, in which case mostly inhomogeneous specimens are produced which are not representative for the subsequent large scale manufacture;
  • test specimens on small presses which imitate the production plant, that is to say work with high pressures and floating chill moulds.
  • the expensive construction and controlling these small presses are very expensive.
  • the green test specimens produced on them permit good indications of the large scale production of pressed artificial carbon bodies, for example electrodes for the manufacture of aluminum.
  • the invention was based upon the desire to produce green artificial carbon test specimens in any desired manner which can be constantly repeated and in considerable numbers.
  • the problem was not easy to solve. Since small artificial carbon masses of about 8 to 10 kg. react less inertly to vibrations than do those of production sizes, for example 500 to 800 kg., it is difficult to obtain test specimens with the same apparent density and the same physical properties as those of the artificial carbon bodies in production sizes.
  • the invention relates to an apparatus and a process for the production of test specimens from green artificial carbon by shaking of a warm, granular mass in a stationary mold which is rigidly connected with the machine frame and the bottom of which, which is formed by a closure plate vertically movable in the lower part of the mold and rests on spring elements, can be set in vibration in the vertical direction with the aid of two oppositely rotating eccentric motors, and which is closable at the top by a counter-plate.
  • the apparatus is distinguished in that the counter-plate is pressable by means of an upper cylinder by oil pressure against the artificial carbon mass with which the mold is charged in operation, by virtue of the installation of a non-return valve and a fine needle valve connected in parallel therewith in the oil conduit, in such a way that it can follow the variation of height of the compacting artificial carbon mass.
  • the process according to the invention in which the apparatus according to the invention is used is characterised in that the counter-plate is pressed against the artificial carbon mass in such a way that it can follow the variation of height of the compacting mass, without thereby exceeding the pressure transmitted by the closure plate at maximum centrifugal force of the eccentric motors.
  • the counter-plate accompanies the vibration with an amplitude lying between one-half and three quarters of the amplitude of the vibrations of the closure plate.
  • the fine needle valve is entirely opened. At every positive amplitude deflection the counter-plate can be forced upwards and thus finally loses contact with the artificial carbon mass.
  • the apparatus according to the invention renders possible the establishment of a state of equilibrium between the return fiow quantity of oil through the fine needle valve and the pressure setting in the hydraulic system.
  • FIGURE illustrates diagrammatically an advantageous form of embodiment of the apparatus according to the invention.
  • a mold 13 of a round steel tube with an internal diameter of 200 mm., a wall thickness of 16 mm. and a height of 300 mm. is welded in a steel plate 14 which in turn is welded with the machine frame 10.
  • the closure plate 15, which serves as bottom for the mold 135, is screwed to the piston rod 16 which carries the piston 17 and is movable in the ejector cylinder 18. In the position as illustrated the closure plate 7 is seated on the collar 19 which is welded on to the base plate 20.
  • the base plate 20 carries the eccentric motors 21 and 22, rotating oppositely in operation, and bears by means of four spring elements 23 each of four helical springs 24 on the machine frame 10.
  • the ejector cylinder 18 is screwed to the base plate 20.
  • 25 is a round counter-plate which is screwed to the piston rod 27 of the oil pressure cylinder 28 which actuates the piston 26.
  • 29 and 30 designate oil conduits which lead to the upper oil pressure cylinder 28.
  • the oil conduit 29 is provided with a non-return valve 31 and with a fine needle valve 32 connected in parallel therewith.
  • the non-return valve 31 is so arranged that the oil which is under pressure during the vibration or compacting and is delivered by the pump assembly 33 can flow only in the direction towards the oil pressure cylinder 28.
  • the non-return valve 31 can be hydraulically released by means of the control conduit 34.
  • Such hydraulically releasable non-return valves are usual in commerce.
  • fine needle valve there may be considered for example the colorflow fine needle valve (2) which is described and illustrated on page 1 of Catalogue 3160 of January, 1970 of the Manatrol Division of the Firm Parker-Hannifin.
  • Such a fine needle valve permits oil to flow through in both directions and is of course regulable.
  • the pump assembly 33 essentially comprises an oil reservoir, a pump driven by an electric motor and a pressure-limiting valve which is adjustable during operation, and is arranged in a control desk 35.
  • Such pump assemblies can be obtained on the market, so that further description is superfluous. Reference is made for example to the pump units type GR of the Firm Oelhydraulik Hagenbuch AG, 6030 Ebikon, Switzerland.
  • the oil conduit 30 is placed under pressure from the pump assembly 33, the non-return valve 31 being released, and oil is fed to the cylinder chamber beneath the piston 26.
  • the closure plate 15 closes off the mold 13 in the downward direction and is drawn by the piston 17 of the ejector cylinder 18 firmly against the collar 19.
  • the pressure in the oil conduit 30 is released, whereby the non-return valve 31 is set in action again, and at the same time the: oil conduit 29 is set under pressure, which firstly effects a downward movement of the piston 26 and thus introduction of the counter-plate 25 into the mold 13.
  • the counter-plate 25 comes into contact with the charge of granular artificial carbon mass 36 and presses upon the mass.
  • the closure plate 15 in common with the base plate 20 is pressed downwards against the spring elements 23, which yield somewhat.
  • a state of equilibrium necessarily establishes itself between the force applied by the oil pressure cylinder 28 and the reaction of the spring elements 23. It must be taken into consideration here that even at the maximum expected amplitude of the vibrations which are forced upon the system by the eccentric motors, the spring elements 23 must not be overstressed, for example not entirely compressed. After the state of equilibrium is reached the eccentric motors are set in operation, and the base plate 20 together with the closure plate 15 begin to vibrate.
  • the counter plate 25 By selection of the oil pressure in the oil conduit 29 the counter plate 25 is pressed against the charge 36 in such a way that it can follow the variation of height of the compacting artificial carbon mass 36 without thereby exceeding the counter pressure transmitted by the closure plate 15 to the mass 36 at maximum centrifugal force of the eccentric motors, and when the compacting has progressed the counter-plate 25 accompanies vibration with an amplitude lying between 5% and "$3 of the amplitude of the vibrations of the closure plate.
  • the eccentric motors are switched off, the pressure in the oil conduit 29 is eliminated and the oil conduit 30 is placed under pressure, the non-return valve 31 being released.
  • the counter-plate 25 is lifted by the pressure in the oil conduit 30.
  • the oil pressure ejector cylinder 18 lifts the compacted artificial carbon specimen, weighing about 8 kg., to the level of the upper mold edge whence it can be removed.
  • the closure plate 15 is drawn again against the collar 19 and a new operation can commence.
  • test specimen For the determination of the reactivity the test specimen is subjected after baking (firing) to a constant CO current at 950 for 7 hours. A part of the carbon of the test specimen is oxidised by the CO into CO and the residue is the residual specimen.
  • test specimens are obtained which give actual information as to artificial carbon bodies which are obtained in the production plant, taking account of the same parameters as in the apparatus according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Crushing And Grinding (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
US00247359A 1971-04-28 1972-04-25 Apparatus for the production of green test specimens from artificial carbon Expired - Lifetime US3764242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH619771A CH550748A (de) 1971-04-28 1971-04-28 Apparatur zum herstellen von gruenen probekoerpern aus kunstkohle.

Publications (1)

Publication Number Publication Date
US3764242A true US3764242A (en) 1973-10-09

Family

ID=4305793

Family Applications (1)

Application Number Title Priority Date Filing Date
US00247359A Expired - Lifetime US3764242A (en) 1971-04-28 1972-04-25 Apparatus for the production of green test specimens from artificial carbon

Country Status (5)

Country Link
US (1) US3764242A (ja)
JP (1) JPS5211320B1 (ja)
CH (1) CH550748A (ja)
FR (1) FR2136797A5 (ja)
GB (1) GB1359768A (ja)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883278A (en) * 1971-07-19 1975-05-13 Southwire Co Anode press with vibration and compaction rate sensing means
US4179258A (en) * 1974-12-04 1979-12-18 Karas Genrikh E Method of molding products from moist materials and apparatus realizing same
US4235580A (en) * 1978-06-01 1980-11-25 Besser Company Noise suppression structure for block making machinery
WO1984000513A1 (en) * 1982-07-23 1984-02-16 Sxd Refractories Inc Method and apparatus for forming particles into shaped articles
US5127816A (en) * 1988-09-07 1992-07-07 Heinrich Wagner Sinto Maschinenfabrik Gmbh Molding machine
US5916504A (en) * 1997-07-07 1999-06-29 Pavement Technology, Inc. Method for forming a test specimen from a mixture of asphalt concrete
FR2830789A1 (fr) * 2001-10-12 2003-04-18 Fcb Aluminium Dispositif et procede de commande d'un element de compression
US20040159060A1 (en) * 2003-02-18 2004-08-19 Gci Pipe Products Form with displaceable vibratory panel
US20060182840A1 (en) * 2005-01-27 2006-08-17 Columbia Machine, Inc. Large pallet machine for forming molded products
CN112354517A (zh) * 2020-11-03 2021-02-12 南京建当化工科技有限公司 一种多孔活性炭成型制备工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761639U (ja) * 1980-09-26 1982-04-12

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1545255A (en) * 1924-05-24 1925-07-07 Macnab Stratified Coal Ltd Molding apparatus
US2831230A (en) * 1954-04-05 1958-04-22 Columbia Machine Works Inc Concrete block forming machine with impact head
US3443626A (en) * 1966-01-24 1969-05-13 Sherwin Williams Co Foundry molding method
US3712785A (en) * 1968-09-04 1973-01-23 Vaw Ver Aluminium Werke Ag Molding machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1545255A (en) * 1924-05-24 1925-07-07 Macnab Stratified Coal Ltd Molding apparatus
US2831230A (en) * 1954-04-05 1958-04-22 Columbia Machine Works Inc Concrete block forming machine with impact head
US3443626A (en) * 1966-01-24 1969-05-13 Sherwin Williams Co Foundry molding method
US3712785A (en) * 1968-09-04 1973-01-23 Vaw Ver Aluminium Werke Ag Molding machine

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883278A (en) * 1971-07-19 1975-05-13 Southwire Co Anode press with vibration and compaction rate sensing means
US4179258A (en) * 1974-12-04 1979-12-18 Karas Genrikh E Method of molding products from moist materials and apparatus realizing same
US4235580A (en) * 1978-06-01 1980-11-25 Besser Company Noise suppression structure for block making machinery
WO1984000513A1 (en) * 1982-07-23 1984-02-16 Sxd Refractories Inc Method and apparatus for forming particles into shaped articles
US4456574A (en) * 1982-07-23 1984-06-26 Sxd Refractories Method and apparatus for forming particles into shaped articles
US5127816A (en) * 1988-09-07 1992-07-07 Heinrich Wagner Sinto Maschinenfabrik Gmbh Molding machine
US5916504A (en) * 1997-07-07 1999-06-29 Pavement Technology, Inc. Method for forming a test specimen from a mixture of asphalt concrete
FR2830789A1 (fr) * 2001-10-12 2003-04-18 Fcb Aluminium Dispositif et procede de commande d'un element de compression
US20040159060A1 (en) * 2003-02-18 2004-08-19 Gci Pipe Products Form with displaceable vibratory panel
US6939121B2 (en) * 2003-02-18 2005-09-06 Gci Pipe Products, Inc. Form with displaceable vibratory panel
US20060022369A1 (en) * 2003-02-18 2006-02-02 Giri Kiran P Form with displaceable vibratory panel
US20060182840A1 (en) * 2005-01-27 2006-08-17 Columbia Machine, Inc. Large pallet machine for forming molded products
US7635261B2 (en) * 2005-01-27 2009-12-22 Columbia Machine, Inc. Large pallet machine for forming molded products
US20100086634A1 (en) * 2005-01-27 2010-04-08 Columbia Machine, Inc. Large pallet machine for forming molded products
US20100227016A1 (en) * 2005-01-27 2010-09-09 Columbia Machine, Inc. Large pallet machine for forming molded products
CN112354517A (zh) * 2020-11-03 2021-02-12 南京建当化工科技有限公司 一种多孔活性炭成型制备工艺

Also Published As

Publication number Publication date
CH550748A (de) 1974-06-28
GB1359768A (en) 1974-07-10
DE2147385A1 (de) 1972-11-02
FR2136797A5 (ja) 1972-12-22
JPS5211320B1 (ja) 1977-03-30
DE2147385B2 (de) 1975-07-10

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