GB2419099A - Mobile concrete mixing machine - Google Patents

Mobile concrete mixing machine Download PDF

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Publication number
GB2419099A
GB2419099A GB0422896A GB0422896A GB2419099A GB 2419099 A GB2419099 A GB 2419099A GB 0422896 A GB0422896 A GB 0422896A GB 0422896 A GB0422896 A GB 0422896A GB 2419099 A GB2419099 A GB 2419099A
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GB
United Kingdom
Prior art keywords
computer
cement
mixing machine
stone
sand
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.)
Granted
Application number
GB0422896A
Other versions
GB2419099B (en
GB0422896D0 (en
Inventor
Graham Anthony Jones
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0422896A priority Critical patent/GB2419099B/en
Publication of GB0422896D0 publication Critical patent/GB0422896D0/en
Publication of GB2419099A publication Critical patent/GB2419099A/en
Application granted granted Critical
Publication of GB2419099B publication Critical patent/GB2419099B/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04Supplying or proportioning the ingredients
    • B28C7/0404Proportioning
    • B28C7/0418Proportioning control systems therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80Forming a predetermined ratio of the substances to be mixed
    • B01F35/83Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/717Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71705Feed mechanisms characterised by the means for feeding the components to the mixer using belts
    • B01F15/0412
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20Measuring; Control or regulation
    • B01F35/22Control or regulation
    • B01F35/2201Control or regulation characterised by the type of control technique used
    • B01F35/2206Use of stored recipes for controlling the computer programs, e.g. for manipulation, handling, production or composition in mixing plants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20Measuring; Control or regulation
    • B01F35/22Control or regulation
    • B01F35/221Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2211Amount of delivered fluid during a period
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/714Feed mechanisms for feeding predetermined amounts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/717Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/717Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71Feed mechanisms
    • B01F35/717Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/02Controlling the operation of the mixing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04Supplying or proportioning the ingredients
    • B28C7/0481Plant for proportioning, supplying or batching
    • B28C7/0486Plant for proportioning, supplying or batching the plant being mobile
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00General arrangement or layout of plant
    • B28C9/04General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • General Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The invention relates to a mobile concrete mixing machine 1. Machine 1 comprises: <SL> <LI>a) a conveyor 20 leading to a concrete mixing chamber 30, <LI>b) a sand hopper 40 having a controllable sand outlet to deliver sand at varying flow rates onto the conveyor, <LI>c) a stone hopper 50 having a controllable stone outlet to deliver stone at varying flow rates onto the conveyor, <LI>d) a cement hopper 60 having a controllable cement outlet to deliver cement at varying flow rates into the mixing chamber, <LI>e) a water hopper 70 having a controllable water outlet to deliver water at varying flow rates into the mixing chamber, and <LI>f) delivery means, such as an aperture 32 to deliver mixed concrete from the mixing chamber, in use said flow rates of the sand, cement, stone, and water are controlled by a user in order to create concrete with any desired ratio of sand, cement, stone, and water. The flow rates are controlled by computer 10 which includes a database containing concrete recipes. Sensors are included to detect the flow rate of materials and conveyor speeds. Additive flow rates are further controlled. </SL>

Description

Title:Mobile Concrete Mixer The present invention relates to a mobile
concrete mixing machine.
Pliant different types of mobile concrete machines exist. Most of these consist of two hoppers containing sand. stone. lander the hoppers runs a conveyor which delivers the sand stone to a mixing station. whew cement from a third hoper and water S'rom a fourth hopper is added l'''n.ce jUitve, "''eS1 ads] :.'e Ted into the mixing chamber.
In,sticr in near s-'n' r. Ie with di/'lcrent sirenglhs. it has been knees, have.1 I.xen Apt at: aim tatty; :-, ti.;eil '<i. .]tL' of cement and then adjust the lion,,' nd and stone Eta it, )13\.,,&., - s;;sat. v r.S..igc of' hi ystc.,. is that the volume of concrete produ; d per minute Is eedu i; i' strong cement mi; :\ esuired and the energy to drive the conveyor Id, mains constant even tier strong cement mixes 1A itch I(\A \olumes of concrete being produced. Erich results in a waste 1' energy The invention seeks to provide a solution to this problem. -it t! . ;
According to the present invention there is provided a mobile concrete mixing machine comprlsmg: a) a conveyor leading to a concrete mixing chamber, b) 9 6 him a cunwilab San] fluLlel c v= al Be n mu. on,. the conveyor, c) a stone hopper having a controllable stone outlet to deliver stone at varying flow rates onto the conveyor, d) a cement hopper having a controllable cement outlet to deliver cement at varying Row rates into the mixing chamber, and a vvater hopper having a controllable water outlet to deliver avatar at varying ilv rate- into the mixing chamber. and 1) ie!ivery means to deliver mixed concrete from the mixing chamber, In use said tlo-v rates ol'the sand, cement. stone. and water are controlled by a user i, order to create concrete with any desired ratio ot and, cement. stone, and water Preferably the speed of the conveyor is - ontrollable.
Preferably the flow rates of the sand, cement, stone, and water are controlled by a computer.
Preferably the computer has a database of set concrete recipes each with a different ratio of sand, cement, stone, and water, and said computer controls the flow rates of the sand, cement, stone, and water according to a recipe selected by a user.
Preferably the computer further controls the speed of the conveyor. Preferably a sensor is provided connected to the computer to sense the speed of the conveyor, and said computer adjusts the speed of the conveyor when the speed sensed is greater or less than a desired speed.
Preferably the conveyor is powered by a hydraulic motor controlled by said computer.
Preferably a sensor is provided connected to the computer to sense the rate of flow of cement, and said computer adjusts the flow rate when the rate sensed is greater or less than a desired rate.
!'reterablv, cement outlet is an Archimedes screvv rotated by a hydraulic motor controlled by quid compuu r and the motor speed controls the flow rate Prelerabl.' censor Is provided cor,nected t, tt,e c,mpucr I;, ensc''; : rate of trove later. :uad Slid compu. !' adjusts the flow rate when the rate sensed Is reater or less than a desired rate.
I'relbr;hl! Staler outlLl is hydraulic motor driven pump c.ntrolled by said computer. and the pump speed.introls the flow.atc.
Preferably rho: concrete mixed further includes one or more concrete additive containers to deliver additives to the mixing chamber. Preferably the computer further controls the 'flow rate of any additives into the mixing chamber. A sensor may be provided connected to the computer to sense the rate of flow of any additives, and said computer adjusts the flow rate when the rate sensed is greater or less than a desired rate. Preferably any additives are delivered by an electric or pneumatic pump.
An embodiment of the invention will now be described with reference to the accompanying drawing showing a schematic view of a machine.
Referring to the drawing there is shown a mobile concrete mixing machine 1. Machine I is controlled by a computer 10 as more fully described belov.
Machine I has a conveyor 0 leading to a concrete mixing chamber 30. Conveyor At) is powered he an hydraulic motor HI which is controllable by the computer Conveyor speed ontrol' I I to driv: the;nnvcor.i! cars ma; Speeds. conveyor speed sensor 9 is prodded cnuccled to to ,mpuler cI'r!/ev,r Spt.;"i sensor I - to SenSL' the speed of the t On\ ever. [he comber adJs' the speed ot':i. corive\ r h, n /he speerl sensed is realer or less than a dcsireL1 peed.
NOntl hopper 4! is pro: Lied Cut Ins a controllable sand outlet in the form of flo control gate I to deliver sand at Airs in' ,1,,vv rates onto the conveyor. Flow control gate 41 is c<,ntrollab;i.
he the computer sand low control'' 14.
A stone hopper 50 is provided having a controllable stone outlet in the term of a flow control gate 51 to deliver stone at varying flow rates onto the conveyor. Flow control gate 51 is controllable by the computer stone flow control" 15. - s
A cement hopper 60 is provided having a controllable cement outlet in the forth of an Archimedes screw 61 rotated by an hydraulic motor 62. Motor 62 is controllable by the computer "cement flow rate control" 16 to drive the conveyor at varying speeds to deliver cement at varying flow rates into the mixing chamber 30. A sensor 63 is provided connected to the computer "cement flow rate sensor" to sense the rate of flow of the cement, and the computer adjusts the flow rate when the rate sensed is greater or less than a desired rate.
A water hopper 7() is provided having a controllable water outlet in the form of an hydraulic motor driving water pump 71. l he speed of pump 71 is controllable by the computer rewater flow rate control'M 8 to deliver water at varying flow rates into the mixing chamber 3(i. . sensor 72 is provided connected to the computer Mater flow rate sensor 19 to sense the rate,I flow ot waler, and the computer ad lusts the flow rate when the rate sensed is greater or less than a desired rate.
Mixing chamber 30 includes a mixing Archimedes screw 31 which leads to a delivery means in the form of aperture 32 to deliver mixed concrete from the mixing chamber.
In use said flow rates of the sand, cement, stone, and water are controlled by a user, along with the speed of the conveyor, in order to create concrete with any desired ratio of sand, cement, stone, and water. It is envisaged that computer 10 has a database of set concrete recipes each with a different ratio of sand, cement, stone, and water, and a set conveyor speed. The computer then controls the flow rates of the sand, cement, stone. and water according to a recipe selected by a user.
I'hc concrete mixer my Further include one or more. cog. two. concrete additive containers (not shoving to deliver addtivcs to the mixim, chamber I'refUraklv the computer further controls the troy rate ot'anv aL, ditves into the mixhg chamber. , sensor may he provided comcccd to tl.c computer lo.:nsc rh. rat: o' loo,i'an\ additives. and the compoitn ad lusts the llo\\ r:!te hen the rate uns.i Is,rc;.er Or less!hun a dcsireL1 rate. I'rcterahly any additives are delivered by an electric fir pneumatic slump.
It will be appreciated that if the conveyor should slow down from an expected speed set by the computer. em due to overheating ot'the hydraulics. then the sensor will sense this and the motor 2I will be controlled to run taster. The same applies to the flow rates of the cement and water. It is envisaged that the sand and stone flow control gates will be shutters which can each be opened to a varying extent to a given aperture size by the computer to give a required flow rate based on a gravity feed. If desired sensors connected to the computer could be provided to sense the position of the sand and stone gate shutters so allowing the computer to control accurately the -)
-
sand and stone flow control gates. One or more vibrators may also be provided to assist the | v;ry:1, and the vb=m may be: tuned on Larva s by the computer In a simple form of the invention, the computer could be omitted and the flow rates of the sand, cement, stone, and water (and optionally the speed ofthe conveyor) could be adjusted manually.
It will be appreciated that by controlling the flow rate of the cement (rather than having this fixed as in the prior art), so the amount of concrete produced can be kept higher when producing a strong mix.
It will he appreciated also that the control of the flow rates of the sand, cement. c. and evader (and optionally the speed ot the conveyor), so the energy used to power the macl,ue can he optimised.
The invention may take a form different to that specifically described above.
Further modifications will be apparent to those skilled in the art without departing trom the scope of the present invention.

Claims (16)

1. A mobile concrete mixing machine comprising: a) a conveyor leading to a concrete mixing chamber, b) a sand hopper having a controllable sand outlet to deliver sand at varying flow rates onto the conveyor, c) a stone hopper having a controllable stone outlet to deliver stone at varying flow rates onto the conveyor, d) a cement hopper having a controllable cement outlet to deliver cement at varying flow rates into the mixing chamber, e) a water hopper having a controllable water outlet to deliver water at varying flow rates into the mixing chamber, and f) delivery means to deliver mixed concrete from the mixing chamber, in use said flow rates ofthe sand, cement, stone, and water are controlled by a user in order to create concrete with any desired ratio of sand, cement, stone, and water.
2. A mobile concrete mixing machine according to claim I, wherein the speed of the conveyor is controllable.
3. A mobile concrete mixing machine according to claim I or 2, wherein the flow rates of the sand, cement, stone, and water are controlled by a computer.
ë .
. .
4. A mobile concrete mixing machine according to claim 3, wherein the computer has a database of set concrete recipes each with a different ratio of sand, cement, stone, and water, and said computer controls the flow rates of the sand, cement, stone, and water according to a recipe selected by a user.
5. A mobile concrete mixing machine according to claim 3 or 4, wherein the computer further controls the speed of the conveyor.
6. A mobile concrete mixing machine according to claim 5, wherein a sensor is provided connected to the computer to sense the speed of the conveyor, and said computer adjusts the speed ofthe conveyor when the speed sensed is greater or less than a desired speed.
7. A mobile concrete mixing machine according to claim 6, wherein the conveyor is powered by a hydraulic motor controlled by said computer.
8. A mobile concrete mixing machine according to any of claims 3 to 7, wherein a sensor is provided connected to the computer to sense the rate of flow of cement, and said computer adjusts the flow rate when the rate sensed is greater or less than a desired rate.
.. ë . .
9. A mobile concrete mixing machine according to any of claims 3 to 8, wherein the cement outlet is an Archimedes screw rotated by a hydraulic motor controlled by said computer, and the motor speed controls the flow rate.
10. A mobile concrete mixing machine according to any of claims 3 to 9, wherein a sensor is provided connected to the computer to sense the rate of flow of water, and said computer adjusts the flow rate when the rate sensed is greater or less than a desired rate.
11. A mobile concrete mixing machine according to claim 10, wherein the water outlet is hydraulic motor driven pump controlled by said computer, and the pump speed controls the flow rate.
12. A mobile concrete mixing machine according to any preceding claim, wherein the concrete mixed archer includes one or more concrete additive containers to deliver additives to the mixing chamber.
13. A mobile concrete mixing machine according to any of claims 3 to 12, wherein the computer further controls the flow rate of any additives into the mixing chamber.
e e e e e e e e e e e e e e e eee see e e ë e e e e e e e e e e e e e e ëe e e e e
14. A mobile concrete mixing machine according to claim 13, wherein a sensor may be provided connected to the computer to sense the rate of flow of any additives, and said computer adjusts the flow rate when the rate sensed is greater or less than a desired rate.
15. A mobile concrete mixing machine according to any of claims 12 to 14, wherein any additives are delivered by an electric or pneumatic pump.
16. A mobile concrete mixing machine substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
e e e e e e e e e e e e e e eee ëe e ë e e e e e e e e e e e e e eee e e e
GB0422896A 2004-10-15 2004-10-15 Mobile concrete mixer Withdrawn - After Issue GB2419099B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0422896A GB2419099B (en) 2004-10-15 2004-10-15 Mobile concrete mixer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0422896A GB2419099B (en) 2004-10-15 2004-10-15 Mobile concrete mixer

Publications (3)

Publication Number Publication Date
GB0422896D0 GB0422896D0 (en) 2004-11-17
GB2419099A true GB2419099A (en) 2006-04-19
GB2419099B GB2419099B (en) 2010-01-27

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2907946A1 (en) * 2006-10-30 2008-05-02 Philippe Jousseaume Adjuvant dispensation controlling device for concrete mixing plant, has industrial automaton including storage unit which stores different operating parameters and connected to measuring unit which measures adjuvant quantity
WO2011093766A1 (en) * 2010-01-28 2011-08-04 Aercrete Industries Ab A device for the manufacture of flowing foam concrete
WO2013012388A1 (en) * 2011-07-15 2013-01-24 Minidea Ab Arrangement and method for handling cement mortar
CN103640092A (en) * 2013-11-19 2014-03-19 中联重科股份有限公司 Feeding control method, apparatus and system thereof, aggregate storage bin and stirring station
GB2532161B (en) * 2013-02-27 2017-08-16 Command Alkon Inc System and process for mixing concrete having desired strength characteristics

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115214017A (en) * 2022-08-03 2022-10-21 郑州浩容水工机械设备有限公司 Large-water-volume sand-coated stone concrete production equipment and production method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9302191A (en) * 1993-12-15 1995-07-03 Daanen B V Maschf Method and apparatus for proportioning raw materials to make bricks
EP1118380A1 (en) * 1999-03-08 2001-07-25 Japan Institute of Construction Engineering Continuous mixing plant
WO2001076839A2 (en) * 2000-04-05 2001-10-18 Advanced Concrete Innovations, Inc. Portable concrete plant
WO2004058469A1 (en) * 2002-12-23 2004-07-15 Port-A-Pour, Inc. Portable concrete plant dispensing system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9302191A (en) * 1993-12-15 1995-07-03 Daanen B V Maschf Method and apparatus for proportioning raw materials to make bricks
EP1118380A1 (en) * 1999-03-08 2001-07-25 Japan Institute of Construction Engineering Continuous mixing plant
WO2001076839A2 (en) * 2000-04-05 2001-10-18 Advanced Concrete Innovations, Inc. Portable concrete plant
WO2004058469A1 (en) * 2002-12-23 2004-07-15 Port-A-Pour, Inc. Portable concrete plant dispensing system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2907946A1 (en) * 2006-10-30 2008-05-02 Philippe Jousseaume Adjuvant dispensation controlling device for concrete mixing plant, has industrial automaton including storage unit which stores different operating parameters and connected to measuring unit which measures adjuvant quantity
WO2011093766A1 (en) * 2010-01-28 2011-08-04 Aercrete Industries Ab A device for the manufacture of flowing foam concrete
WO2013012388A1 (en) * 2011-07-15 2013-01-24 Minidea Ab Arrangement and method for handling cement mortar
GB2532161B (en) * 2013-02-27 2017-08-16 Command Alkon Inc System and process for mixing concrete having desired strength characteristics
CN103640092A (en) * 2013-11-19 2014-03-19 中联重科股份有限公司 Feeding control method, apparatus and system thereof, aggregate storage bin and stirring station

Also Published As

Publication number Publication date
GB2419099B (en) 2010-01-27
GB0422896D0 (en) 2004-11-17

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