EP1758718B1 - Method and arrangement for automatic mixing of water and concrete for rock bolting - Google Patents

Method and arrangement for automatic mixing of water and concrete for rock bolting Download PDF

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Publication number
EP1758718B1
EP1758718B1 EP05745006A EP05745006A EP1758718B1 EP 1758718 B1 EP1758718 B1 EP 1758718B1 EP 05745006 A EP05745006 A EP 05745006A EP 05745006 A EP05745006 A EP 05745006A EP 1758718 B1 EP1758718 B1 EP 1758718B1
Authority
EP
European Patent Office
Prior art keywords
water
concrete
control unit
mixing vessel
mixing
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.)
Active
Application number
EP05745006A
Other languages
German (de)
French (fr)
Other versions
EP1758718A1 (en
Inventor
Hans Gustavsson
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.)
Epiroc Rock Drills AB
Original Assignee
Atlas Copco Rock Drills AB
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 Atlas Copco Rock Drills AB filed Critical Atlas Copco Rock Drills AB
Publication of EP1758718A1 publication Critical patent/EP1758718A1/en
Application granted granted Critical
Publication of EP1758718B1 publication Critical patent/EP1758718B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B28C7/00—Controlling 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
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/0422—Weighing predetermined amounts of ingredients, e.g. for consecutive delivery
    • 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
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/881—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise by weighing, e.g. with automatic discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling 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
    • B28C7/02—Controlling the operation of the mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00—General arrangement or layout of plant
    • B28C9/002—Mixing systems, i.e. flow charts or diagrams; Making slurries; Involving methodical aspects; Involving pretreatment of ingredients; Involving packaging
    • B28C9/004—Making slurries, e.g. with discharging means for injecting in a well or projecting against a wall
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis

Definitions

  • the present invention relates to a method and an arrangement for automatic mixing of water and concrete for rock bolting.
  • the present invention which is defined in the following patent claims, has the purpose to achieve an automatic method and arrangement for mixing of water and concrete that guarantees an accurate mixing proportion between water and concrete without negative influence from air admixture.
  • the arrangement disclosed in the figure includes a mixing vessel 1 in which a mixing arrangement in the form of a mixer 13 is arranged.
  • the mixer is run by a motor 15, which running is controlled by a control unit 3.
  • a control unit 3 For determination of the amount of material in the mixing vessel 1, this is arranged for weighing with a scale 4.
  • Water is added to the mixing vessel 1 from a water source 16 via a valve 11 and a pipe 17. Concrete is added to the mixing vessel 1 from a supply 18 via a feeder 12 and a pipe 19.
  • the valve 11 and the feeder 12 are controlled by the control unit 3.
  • the arrangement shown on the figure works in the following way.
  • the control unit 3 then calculates the demanded weights of concrete and water from either the demanded weight of the completed mixture or from the volume of the mixing vessel 1.
  • the mixing starts by weighing the amounts of water and concrete with the scale 4.
  • the mixing vessel 1 is standing on the scale 4.
  • the mixing vessel may of course be hung up, e.g. in a load cell.
  • the water is added quickly from the source 16 to about the wished amount.
  • the amount of concrete is recalculated to take into account the real amount of water.
  • the concrete is added to the mixing vessel 1 with the feeder 12, e.g. a screw feeder. Thereafter the motor 15 is started to run the mixer 13 a predetermined time set in the control unit 3. When the mixing has been made, the mixture of water and concrete is transferred to the drill hole 2 with the pump 14.
  • the feeder 12 e.g. a screw feeder.
  • the mixing vessel 1 and other equipment should be cleaned to prevent that the equipment is destroyed at an interruption of the work. This is made by adding water to the mixing vessel 1 until the water level 5 reaches an upper, selectable limit.
  • the mixer 13 and the pump 14 are run during the whole cleaning procedure.
  • the water level 5 is determined with the help of the scale 4.
  • the mixing vessel is refilled to the upper level. This method is repeated a predetermined number of times or during a predetermined time.
  • the cleaning is carried through the equipment is switched off and the mixing vessel 1 is emptied.
  • the whole process is controlled by the control unit 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Dispersion Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Method and arrangement for automatic mixing of water and concrete for rock bolting including adding water and concrete to a mixing vessel (1), mixing the water and concrete, and transferring the water and concrete to a drill hole(2). Water amount and concrete amount for the mixture of water and concrete is calculated in a control unit (3), that the calculated water amount is added to the mixing vessel (1), that the in the reality added water amount is weighed (4), that the calculated concrete amount is corrected considering the in the reality added water amount to obtain a correct mixture of water and concrete, that concrete and water are mixed during a predetermined time, and in that the mixture of water and concrete is transferred to a drill hole (2).

Description

  • The present invention relates to a method and an arrangement for automatic mixing of water and concrete for rock bolting.
  • In the mixing of water and concrete for rock bolting it is customary to add measured volumes of water and concrete to a mixing vessel. Thereafter concrete and water are mixed until the mixture seems ready. Such a method for automatic mixing of water and concrete with corresponding arrangement according to the pre-amble of claims 1 and 3, is disclosed in US-A1-2004/0100858 . A disadvantage with this method is that you get an admixture of air, which means that the mixing proportion between water and concrete becomes uncertain. This leads to that the fastening of the rock bolt in the rock may be somewhat uncertain, i.e. more rock bolts may be needed for the reinforcement of the rock than would be needed if the mixture of water and concrete had a more secure mixing proportion between water and concrete.
  • The present invention, which is defined in the following patent claims, has the purpose to achieve an automatic method and arrangement for mixing of water and concrete that guarantees an accurate mixing proportion between water and concrete without negative influence from air admixture.
  • An embodiment of the invention is described below with reference to enclosed figure, which shows schematically an arrangement for automatic mixing of water and concrete according to the invention.
  • The arrangement disclosed in the figure includes a mixing vessel 1 in which a mixing arrangement in the form of a mixer 13 is arranged. The mixer is run by a motor 15, which running is controlled by a control unit 3. For determination of the amount of material in the mixing vessel 1, this is arranged for weighing with a scale 4. Water is added to the mixing vessel 1 from a water source 16 via a valve 11 and a pipe 17. Concrete is added to the mixing vessel 1 from a supply 18 via a feeder 12 and a pipe 19. The valve 11 and the feeder 12 are controlled by the control unit 3.
  • The arrangement shown on the figure works in the following way. First the operator sets the demanded weight ratio between concrete and water and the demanded total weight for the mixture unless the whole volume of the mixing vessel is demanded. These values are stored in the control unit 3. The control unit 3 then calculates the demanded weights of concrete and water from either the demanded weight of the completed mixture or from the volume of the mixing vessel 1. The mixing starts by weighing the amounts of water and concrete with the scale 4. In the shown example the mixing vessel 1 is standing on the scale 4. The mixing vessel may of course be hung up, e.g. in a load cell. The water is added quickly from the source 16 to about the wished amount. Thereafter, the amount of concrete is recalculated to take into account the real amount of water. The concrete is added to the mixing vessel 1 with the feeder 12, e.g. a screw feeder. Thereafter the motor 15 is started to run the mixer 13 a predetermined time set in the control unit 3. When the mixing has been made, the mixture of water and concrete is transferred to the drill hole 2 with the pump 14.
  • When the mixture of water and concrete has been transferred to the drill hole 2, the mixing vessel 1 and other equipment should be cleaned to prevent that the equipment is destroyed at an interruption of the work. This is made by adding water to the mixing vessel 1 until the water level 5 reaches an upper, selectable limit. The mixer 13 and the pump 14 are run during the whole cleaning procedure. The water level 5 is determined with the help of the scale 4. When the water level 5 has reached a lower limit, then the mixing vessel is refilled to the upper level. This method is repeated a predetermined number of times or during a predetermined time. When the cleaning is carried through the equipment is switched off and the mixing vessel 1 is emptied. The whole process is controlled by the control unit 3. An advantage with this method is that it is automatic so that the operator can leave the equipment and perform other work at the same time as the cleaning is performed.

Claims (4)

  1. Method for automatic mixing of water and concrete for rock bolting including adding water and concrete to a mixing vessel (1), mixing the water and concrete, and transferring the water and concrete to a drill hole (2), characterized by
    - storing a demanded quantity ratio between concrete and water in a control unit (3) for a mixture to be mixed,
    - storing a demanded total quantity for the mixture in the control unit (3),
    - calculating, in the control unit (3), an amount of water and an amount of concrete for the mixture according to the demanded total quantity and the demanded ratio,
    - adding water to about the calculated amount into the mixing vessel (1) under control of the control unit (3),
    - weighing (4) the mixing vessel (1) and transmitting a signal corresponding to the measured weight to the control unit (3) to establish real added amount of water,
    - correcting in the control unit (3) the calculated amount of concrete considering the real added amount of water to obtain a correct mixture of water and concrete according to the stored quantity ratio,
    - adding the corrected amount of concrete to the mixing vessel (1) under control of the control unit (3),
    - mixing concrete and water during a predetermined time controlled by the control unit, and
    - transferring the mixture to a drill hole (2).
  2. Method according to claim 1, characterized by
    - filling the mixing vessel (1) with water under control of the control unit (3), after the transferring of the water and concrete mixture to a drill hole (2),
    - evacuating water from the mixing vessel under control of the control unit (3)
    - controlling by the control unit (3) the water level (5) in the mixing vessel. (1) between an upper level and a lower level and
    - repeating the steps of this claim for a predetermined time or a predetermined number of times controlled by the control unit.
  3. Arrangement for automatic mixing of water and concrete for rock bolting including means (11) for adding water to a mixing vessel (1), and means (12) for adding concrete to the mixing vessel (1), a mixer (13) for mixing the water and concrete in the mixing vessel (1), weighing means (4) adapted to measure the weight of the mixing vessel (1), and means (14) for transferring the water and concrete to a drill hole (2), characterized in that the arrangement comprises a control unit (3) having means for entering and storing a demanded quantity ratio between concrete and water and a demanded total quantity for a mixture to be mixed, the control unit (3) further having means for calculating amount of water and amount of concrete for the mixture according to the demanded total quantity and the demanded ratio, and further being arranged to communicate with the weighing means (4) and to control the means for adding water (11) and the means for adding concrete (12), the control unit further being adapted to add about the calculated amount of water and thereafter by weighing the mixing vessel establish the real added amount of water, and further adapted to correct the amount of concrete considering the real added amount of water to obtain a correct mixture of water and concrete, and to add said corrected amount of concrete to the mixing vessel and further adapted to control the mixing of concrete and water during a predetermined time by means in the control unit for controlling the time for the mixing, the arrangement having means for transferring the prepared water and concrete mixture to a drill hole (2).
  4. Arrangement according to claim 3, characterized in that it comprises means (11) for filling of the mixing vessel (1) with water after the transferring of the water and concrete mixture to a drill hole (2), means (14) for evacuating water from the mixing vessel and means in the control unit (3) for controlling the water level (5) in the mixing vessel (1) between an upper level and a lower level for a predetermined time or a predetermined number of times and further means in the control unit to run the mixer (13) and the means(14) for evacuating water during said predetermined time or number of times to clean the mixing vessel.
EP05745006A 2004-06-23 2005-05-20 Method and arrangement for automatic mixing of water and concrete for rock bolting Active EP1758718B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0401616A SE0401616L (en) 2004-06-23 2004-06-23 Method and device for automatic mixing of water and cement for rock bolting
PCT/SE2005/000741 WO2006001743A1 (en) 2004-06-23 2005-05-20 Method and arrangement for automatic mixing of water and concrete for rock bolting

Publications (2)

Publication Number Publication Date
EP1758718A1 EP1758718A1 (en) 2007-03-07
EP1758718B1 true EP1758718B1 (en) 2010-06-09

Family

ID=32906848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05745006A Active EP1758718B1 (en) 2004-06-23 2005-05-20 Method and arrangement for automatic mixing of water and concrete for rock bolting

Country Status (8)

Country Link
EP (1) EP1758718B1 (en)
AT (1) ATE470546T1 (en)
AU (1) AU2005257699B2 (en)
CA (1) CA2563383C (en)
DE (1) DE602005021783D1 (en)
NO (1) NO331760B1 (en)
SE (1) SE0401616L (en)
WO (1) WO2006001743A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108435030A (en) * 2018-05-11 2018-08-24 荆门它山之石电子科技有限公司 A kind of intelligence chemical industry blending tank

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2417012A1 (en) * 1974-04-08 1975-10-23 Scheurich Concrete mixes from cement, aggregates and water - using memory stores to calculate exact amt. of water required
CA1239026A (en) * 1985-05-31 1988-07-12 Allan Pearson Method and apparatus for anchoring rock bolts and cables
IE77873B1 (en) * 1995-12-29 1998-01-14 Mayasta Limited A process for making readymix concrete
US5795060A (en) * 1996-05-17 1998-08-18 Stephens; Patrick J. Method and apparatus for continuous production of colloidally-mixed cement slurries and foamed cement grouts
GB2318304B (en) * 1996-10-28 2000-11-29 Yan Lee Holdings Ltd Mobile batching plant
AU2001253194A1 (en) * 2000-04-05 2001-10-23 Advanced Concrete Innovations, Inc. Portable concrete plant
WO2002032826A2 (en) * 2000-10-13 2002-04-25 Air Crete Block, Inc. Method and apparatus for compressing lightweight concrete
US6491421B2 (en) * 2000-11-29 2002-12-10 Schlumberger Technology Corporation Fluid mixing system

Also Published As

Publication number Publication date
SE526474C2 (en) 2005-09-20
AU2005257699B2 (en) 2010-03-04
DE602005021783D1 (en) 2010-07-22
SE0401616D0 (en) 2004-06-23
ATE470546T1 (en) 2010-06-15
NO331760B1 (en) 2012-03-19
SE0401616L (en) 2005-09-20
CA2563383C (en) 2013-10-29
AU2005257699A1 (en) 2006-01-05
CA2563383A1 (en) 2006-01-05
NO20070409L (en) 2007-01-22
EP1758718A1 (en) 2007-03-07
WO2006001743A1 (en) 2006-01-05

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