US3456926A - Concrete mixing machine - Google Patents

Concrete mixing machine Download PDF

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Publication number
US3456926A
US3456926A US638281A US3456926DA US3456926A US 3456926 A US3456926 A US 3456926A US 638281 A US638281 A US 638281A US 3456926D A US3456926D A US 3456926DA US 3456926 A US3456926 A US 3456926A
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US
United States
Prior art keywords
steam
mixing
concrete
shovels
mixing machine
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 - Lifetime
Application number
US638281A
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English (en)
Inventor
Gustav E Hummelshoj
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Thomas Schmidt AS
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Individual
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Publication date
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Publication of US3456926A publication Critical patent/US3456926A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/46—Arrangements for applying super- or sub-atmospheric pressure during mixing; Arrangements for cooling or heating during mixing, e.g. by introducing vapour
    • B28C5/466—Heating, e.g. using steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/95—Heating or cooling systems using heated or cooled stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
    • B28C5/163—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis in annularly-shaped containers

Definitions

  • the invention consists in aconcrete mixing machine in which the mixing process is performed by mixing shovels carried on supporting arms and operating in a pan-shaped or annular mixing tub, while steam is being injected into the mass that is being mixed, the steam injection being performed through the arms which are hollow and through exhaust openings on the back side of the shovels in such a way that the steam exhausts into the cavity created behind each shovel in the mass that is being mixed, which ensures that any risk of the steam exhaust openings getting obstructed or concrete mass flowing into the said openings is avoided.
  • a uniform heating of the concrete mass is obtained by mixing shovels carried on supporting arms and operating in a pan-shaped or annular mixing tub, while steam is being injected into the mass that is being mixed, the steam injection being performed through the arms which are hollow and through exhaust openings on the back side of the shovels in such a way that the steam exhausts into the cavity created behind each shovel in the mass that is being mixed, which ensures that any risk of the steam exhaust openings getting obstructed or
  • the method that has so far been used to the widest extent for this purpose has been to inject steam into the hoppers or heaps containing the materials, the steam condensing on the cold materials and thereby heating them with its high latent heat.
  • This method is more effective than heating the materials by direct flame action or by hot air, but it has severe drawbacks, particularly due to the fact that the influence of the steam on the material varies from one portion of the material to the other. This means that the heating becomes irregular, and the considerable quantities of condensate are distributed to unevenly that it becomes to diflicult to control the water in the finished concrete.
  • the invention is based on the recognition that the application of the steam to the materials should be performed in such a way that the steam jet or jets constantly impinge on new particles of the material and only 3,456,926 Patented July 22, 1969 for fractions of a second act on the same particles of the material.
  • the invention consists in a concrete mixing machine, in which it is possible in a practical manner in the machine proper to apply the steam during the mixing process to the cold materials. Moreprecisely defined the invention relates to concrete mixing machines of the type which can be termed positive mixers, i.e. machines in which the mixing process is performed by means of mixing shovels carried on supporting arms and operating in a pan-shaped or annular mixing tub.
  • the shovels may be stationary and the tub may rotate about the axis of the shovel system, or the tub maybe stationary and the shovel system with the supporting arms may rotate about the axis of the tub.
  • the arrangement according to the invention consists in that the supporting arms of the mixing shovels are hollow and at their ends remote from the shovels are connected to a supply pipe for steam whereas at the shovels they are provided with exhaust openings for the steam.
  • the steam is injected into the mass that is being mixed at the points where the agitating and mixing are .most intensive, and this can be carried out without the use of separate supply pipes which would have to be forced through the mass and thereby would increase the power requirements and possibly influence the mixing process detrimentally; such supply pipes would furthermore be very diflicult to keep clean.
  • the exhaust openings are so disposed that the steam exhausts into the cavity created behind each shovel in the mass that is being mixed, which ensures that any risk of the steam exhaust openings getting obstructed or concrete mass flowing into the said openings is avoided.
  • the invention is illustrated in the drawing which is in section and partly diagrammatically shows an embodiment of a positive mixing machine according to the invention.
  • the positive mixing machine shown consists of a base frame 10 on which is mounted an electric motor 11 with a vertical shaft which by means of V-pulleys 12 and 13 drives a central shaft 14, which through a toothed reduction gear operates a head 15 located at the top of the machine, on which head a number of downwardsinclined supporting arms 4 are provided, each of which arms at its lower end carries a mixing shovel 5.
  • the mixing shovels operate in the usual way in an annular mixing tub 6 with supply devices, not further shown, for the materials to be mixed, besides water, and discharge opening for the ready-mixed product.
  • the supporting arms 4 are hollow and at their upper ends connected to pipes 3 which through a stuffing box 2 are connected to a stationary steam supply pipe 1.
  • the hollow arms 4 each terminate in a slot-shaped exhaust opening 7 located behind the associated shovel 5 and rearwards-directed in relation to the direction of movement of the shovel.
  • the shovels are in the usual manner forced around in the mixing tub 6, and as at the same time steam of a suitably slight pressure above atmospheric is supplied through the steam supply pipe 1, there will through the stuffing box 2, the connecting pipes 3, the hollow arms 4 and the exhaust openings 7 occur an exhaust of steam directly into the cavity created behind each shovel 5 in the mass that is being mixed.
  • the steam is made to act on the materials while the latter are being violently agitated and thoroughly mixed, so that the materials are heated quickly and homogeneously by the steam without any part of the materials being subjected to a prolonged influence by the steam under stationary conditions.
  • the heating can be controlled carefully by adjusting the supply of steam through the steam supply pipe 1 by means of suitable control means, not shown, and the condensate formed will be distributed evenly in the mass being mixed, so that this water can be taken into account when calculating the amount of water to be added to the aggregate, and a freshly mixed concrete of the desired composition and the desired temperature can always be produced.
  • a concrete mixing machine for producing concrete at an elevated temperature comprising an annular mixing tub, a central head coaxially mounted within said tub, a plurality of hollow arms depending from said head, a mixing shovel provided on the lower end of each said arm, means to cause relative rotation between said head and said tub so that said shovels mix the concrete mixture contained in said tub, an outlet orifice adjacent the lower end of each said arm directed rearwardly with respect to said relative rotation, and a central steam supply conduit connected to the upper end of each said arm whereby steam is exhausted into the cavities formed in the mixture by the shovels during mixing.
  • a concrete mixing machine according to claim 1 in which each said orifice is located immediately behind its associated mixing shovel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
US638281A 1966-06-27 1967-05-15 Concrete mixing machine Expired - Lifetime US3456926A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK331566AA DK111164B (da) 1966-06-27 1966-06-27 Anordning ved betonblandemaskiner.

Publications (1)

Publication Number Publication Date
US3456926A true US3456926A (en) 1969-07-22

Family

ID=8121500

Family Applications (1)

Application Number Title Priority Date Filing Date
US638281A Expired - Lifetime US3456926A (en) 1966-06-27 1967-05-15 Concrete mixing machine

Country Status (13)

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US (1) US3456926A (enrdf_load_html_response)
AT (1) AT288221B (enrdf_load_html_response)
BE (1) BE698614A (enrdf_load_html_response)
CH (1) CH473659A (enrdf_load_html_response)
DE (1) DE1265640B (enrdf_load_html_response)
DK (1) DK111164B (enrdf_load_html_response)
ES (1) ES340559A1 (enrdf_load_html_response)
FI (1) FI42518B (enrdf_load_html_response)
FR (1) FR1522908A (enrdf_load_html_response)
GB (1) GB1183256A (enrdf_load_html_response)
NL (1) NL143459B (enrdf_load_html_response)
NO (1) NO120626B (enrdf_load_html_response)
SE (1) SE326911B (enrdf_load_html_response)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536304A (en) * 1968-09-11 1970-10-27 Bernhard V Fejmert Mixing apparatus
JPS5110452Y1 (enrdf_load_html_response) * 1970-01-27 1976-03-19
US4165185A (en) * 1977-02-17 1979-08-21 Fejmert Bernhard V Mixer, preferably for the mixing of concrete
FR2432925A1 (fr) * 1978-08-09 1980-03-07 Fejmert Bernhard Malaxeur pour le beton et autres matieres
US20030072209A1 (en) * 2001-10-15 2003-04-17 Officine Meccaniche Galletti O.M.G. S.R.L. Light inexpensive cross for mixers of concrete, mortar and similar materials
WO2006084792A1 (en) * 2005-02-08 2006-08-17 Dario Toncelli Vertical-axis mixing machine for processing mixes

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH490110A (de) * 1969-02-28 1970-05-15 Spemag Ag Mischmaschine
JPS5140291B1 (enrdf_load_html_response) * 1970-08-06 1976-11-02
FR2182610B1 (enrdf_load_html_response) * 1972-03-13 1978-03-03 Leger Jean
DE2331421C2 (de) * 1973-06-20 1984-03-01 Elba-Werk Maschinen-Gesellschaft Mbh & Co, 7505 Ettlingen Vorrichtung zur Erwärmung der Zuschlagstoffe für die Herstellung von Heißbeton
DE2834903A1 (de) * 1978-08-09 1980-02-21 Bernhard Valdemar Fejmert Mischer, vorzugsweise betonmischer
CN107344396A (zh) * 2016-05-05 2017-11-14 王勤 一种混凝土搅拌机
CN112895136A (zh) * 2021-01-20 2021-06-04 江苏晨日环保科技有限公司 一种适用于多种类砂浆的三位一体智能化生产线
CN114212872B (zh) * 2021-12-17 2023-06-06 扬州大学 一种搅拌式异相芬顿反应器及有机废水处理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US738148A (en) * 1902-12-26 1903-09-08 Baxeres Gold Extraction Company Ltd Apparatus for extraction of precious metals from their ores.
US3081983A (en) * 1959-12-31 1963-03-19 Thibodeaux Clifford Concrete mixer
US3273863A (en) * 1964-04-24 1966-09-20 Lodige Wilhelm Mixing apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073285B (de) * 1960-01-14 Richard Frisse Maschinenfabrik Biemsen-Ahmsen Misch und Versalbungsma schine fur fetthaltige Massen insbesondere Schokoladenmassen mit Doppelzyhndcrtrog
DE854319C (de) * 1951-04-04 1952-11-04 Guenter Scholz Verfahren und Vorrichtung zum Dosieren von Flugasche

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US738148A (en) * 1902-12-26 1903-09-08 Baxeres Gold Extraction Company Ltd Apparatus for extraction of precious metals from their ores.
US3081983A (en) * 1959-12-31 1963-03-19 Thibodeaux Clifford Concrete mixer
US3273863A (en) * 1964-04-24 1966-09-20 Lodige Wilhelm Mixing apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536304A (en) * 1968-09-11 1970-10-27 Bernhard V Fejmert Mixing apparatus
JPS5110452Y1 (enrdf_load_html_response) * 1970-01-27 1976-03-19
US4165185A (en) * 1977-02-17 1979-08-21 Fejmert Bernhard V Mixer, preferably for the mixing of concrete
FR2432925A1 (fr) * 1978-08-09 1980-03-07 Fejmert Bernhard Malaxeur pour le beton et autres matieres
US20030072209A1 (en) * 2001-10-15 2003-04-17 Officine Meccaniche Galletti O.M.G. S.R.L. Light inexpensive cross for mixers of concrete, mortar and similar materials
US6752527B2 (en) * 2001-10-15 2004-06-22 Officine Meccaniche Galletti, O.M.G. S. R. L. Light inexpensive cross for mixers of concrete, mortar and similar materials
WO2006084792A1 (en) * 2005-02-08 2006-08-17 Dario Toncelli Vertical-axis mixing machine for processing mixes
US20080181049A1 (en) * 2005-02-08 2008-07-31 Dario Toncelli Vertical-axis mixing machine for processing mixes
US7530731B2 (en) 2005-02-08 2009-05-12 Dario Toncelli Vertical-axis mixing machine for processing mixes

Also Published As

Publication number Publication date
FI42518B (enrdf_load_html_response) 1970-04-30
FR1522908A (fr) 1968-04-26
NL6708884A (enrdf_load_html_response) 1967-12-28
NL143459B (nl) 1974-10-15
GB1183256A (en) 1970-03-04
DE1265640B (de) 1968-04-04
BE698614A (enrdf_load_html_response) 1967-11-03
CH473659A (de) 1969-06-15
DK111164B (da) 1968-06-17
SE326911B (enrdf_load_html_response) 1970-08-03
NO120626B (enrdf_load_html_response) 1970-11-09
ES340559A1 (es) 1968-06-01
AT288221B (de) 1971-02-25

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