GB2459928A - Mixing chamber and screw conveyor for preparing mortar - Google Patents

Mixing chamber and screw conveyor for preparing mortar Download PDF

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Publication number
GB2459928A
GB2459928A GB0808724A GB0808724A GB2459928A GB 2459928 A GB2459928 A GB 2459928A GB 0808724 A GB0808724 A GB 0808724A GB 0808724 A GB0808724 A GB 0808724A GB 2459928 A GB2459928 A GB 2459928A
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United Kingdom
Prior art keywords
mixing chamber
mixing
screw conveyor
blades
dry material
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GB0808724A
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GB0808724D0 (en
Inventor
Conor Mcalinden
Campbell Brown
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Individual
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Individual
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Priority to GB0808724A priority Critical patent/GB2459928A/en
Publication of GB0808724D0 publication Critical patent/GB0808724D0/en
Publication of GB2459928A publication Critical patent/GB2459928A/en
Withdrawn legal-status Critical Current

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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
    • B28C5/08—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
    • B28C5/1238—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 for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1276—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 for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with consecutive separate containers with rotating stirring and feeding or discharging means
    • B28C5/1284—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 for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with consecutive separate containers with rotating stirring and feeding or discharging means having a feeding hopper and consecutive vertical or inclined mixing container fed at its upper part
    • 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
    • B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
    • B28C5/26—Mixing in containers to which motion is imparted to effect the mixing rotating about a vertical or steeply inclined axis during the mixing, e.g. comprising a flat bottomplate rotating about a vertical axis, co-operating with blades or stirrers
    • 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
    • B28C7/12—Supplying or proportioning liquid ingredients
    • 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
    • B28C9/02—General arrangement or layout of plant for producing mixtures of clay or cement with other materials
    • 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
    • B28C9/04—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages
    • B28C9/0409—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages and broken-down for transport
    • B28C9/0418—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages and broken-down for transport with a storage silo movable between a horizontal transport position and a vertical working position

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

A mixing apparatus 10 for preparing mortar consists of a screw conveyor 20 for conveying dry material, such as a mixture of sand and cement, from a storage vessel 2 to a mixing chamber 30. The mixing chamber 30 has an inlet end 35, adapted to receive dry material from an outlet end of the screw conveyor 20, an outlet end 36 for dispensing wet mortar, and a water feed 39 intermediate the inlet 35 and outlet 36 ends for delivering a metered flow or quantity of water into the mixing chamber 30. Mixing means 40 is provided within the mixing chamber 30 for mixing the dry material and water and for controlling the passage of material from the inlet 35 to said outlet 36 end of the mixing chamber 30. The outlet end of the screw conveyor 20 is located above said inlet end 35 of the mixing chamber so that dry material falls from the outlet end of the screw conveyor 20 into the mixing chamber 30 under gravity. The arrangement ensures separation is maintained between the dry material in the screw conveyor 20 and the wet material in the mixing chamber 30. Also described is a mixing apparatus in which the flow rate of dry material through the screw conveyor and the flow rate of wet material through the mixing chamber can be controlled independently. Preferably the mixing means 40 is a rotatable agitator. A steeply inclined delivery pipe (50) may connect the screw conveyor 20 and the mixing chamber 30. A method of preparing mortar using such apparatus is also disclosed.

Description

Mixing Apparatus and Method for Preparin2 Mortar This invention relates to a mixing apparatus and method for preparing mortar and in particular to a portable apparatus for preparing batches of mortar on a construction site.
The invention relates particukfly to apparatus for mixing a dry substance, e.g. cement or mortar, with a liquid, e.g. water. The apparatus is particularly suited for use with silos, especially dry mortar silos.
Typically mortar for construction purposes is prepared off site, by mixing of sand, cement and water. Subsequently the wet mix is conveyed to a construction site in specially adapted vehicles having a rotating drum for mixing the mortar. However, a significant drawback with this process is that the mortar begins to set as soon as the binder (cement) comes into contact with moisture, therefore the mixed wet mortar must be used quickly and, due to the difficulty in delivering exactly the required amount of mortar, considerable wastage may occur.
More recently, attempts have been made to overcome the abovementioned disadvantages by delivering a dry mixture of sand and cement to the construction site, known as dry mortar, and feeding metered quantities of the dry mortar to a mixing chamber wherein the dry mortar is mixed with water. Such dry mortar is typically conveyed to a construction site in a silo mountable on the back of a lorry, the silo being mounted on a support frame whereby the silo can be mounted in an upright position once removed from the lorry. A conveying and mixing device is provided at a lower end of the silo comprising a horizontally arranged passage having a rotatable shaft mounted therein driven by an electric motor, a first part of the passage defining a screw conveyor for conveying dry mortar from the silo to a second part of the passage defining a coaxial mixing chamber wherein a second part of the shaft is provided with mixing blades, water being supplied into the mixing chamber for producing wet mortar at an outlet of the mixing chamber. An example of such arrangement is shown in US 4,855,960.
A disadvantage of such known dry silo mortar systems is that, due to the large loads placed upon the electric motor due to the requirement to both convey dry material through the screw conveyor to the mixing chamber and mix and convey wet material through the mixing chamber, motor failures are common, along with failure of the bearings and seals associated with the motor. Also, due to the coaxial arrangement of the screw conveyor and the mixing chamber, there is a risk of contamination of the screw conveyor with water, which can lead to blocking of the screw conveyor and damage thereto. Also, the horizontal mounting of the conveying and mixing device at the bottom of the silo limits the height of the mortar outlet, limiting the size of container that can he placed therebeneath for receiving mixed wet mortar, and creates a large back pressure upon the motor. An object of the present invention is to provide an improved mixing apparatus that mitigates these disadvantages.
According to a first aspect, the present invention provides a mixing apparatus for preparing mortar comprising a screw conveyor for conveying dry material, such as a mixture of sand and cement, from a storage vessel to a mixing chamber, said mixing chamber having an inlet end, adapted to receive dry material from an outlet end of said screw conveyor, an outlet end for dispensing wet mortar, and a water feed intermediate said inlet and outlet ends for delivering a metered flow or quantity of water into the mixing chamber, mixing means being provided within said mixing chamber for mixing said dry material and water and for controlling the passage of material from said inlet to said outlet end of the mixing chamber, wherein said outlet end of said screw conveyor is located above said inlet end of said mixing chamber such that dry material falls from the outlet end of the screw conveyor into the mixing chamber under gravity. As such, separation is maintained between the dry material in the screw conveyor and the wet material in the mixing chamber.
Preferably the outlet end of the screw container communicates with the inlet end of the mixing chamber via a vertical or steeply inclined passage extending therebetween in a downwardly extending direction.
Preferably an auger or screw of said screw conveyor is rotatable by means of a first motor, said mixing means of said mixing chamber being rotatable by means of a second motor, said first and second motors being controllable independently whereby the flow rate of dry material through the screw conveyor and the flow of wet material through the mixing chamber can be controlled independently. In one embodiment said first and second motors comprise electric motors. Said motors may be connected to the respective shafts of the screw conveyor and mixing means by suitable reduction gears.
Preferably said screw conveyor is mounted in an upwardly inclined configuration, thereby enabling the mixing chamber to be positioned at a height independent of the position of the storage vessel.
Preferably said mixing chamber comprises a cylindrical chamber, said mixing means being rotatably mounted within said chamber for rotation about a rotational axis coaxial with the axis of said cylindrical chamber. In a preferred embodiment, said mixing chamber is arranged in an inclined, vertical or substantially vertical orientation with said inlet end at an upper end and said outlet end at a lower end, said mixing means being arranged to control the passage of material through the mixing chamber. By arranging the mixing chamber vertically, any back torque on the mixing means is minimised because the wet material effectively passes through the mixing chamber under the action of gravity.
Preferably said mixing means comprises a shaft mounted coaxially within said cylindrical mixing chamber and having a plurality of radially extending mixing blades. Preferably each of said blades has a leading edge and a trailing edge with respect to the direction of rotation of the shaft of the mixing means, each blade being mounted at an angle or pitch such that the leading edge of each blade is lower than the trailing edge thereof whereby the blades convey wet material through the mixing chamber during rotation of the blades. Preferably each blade has a pitch of between 20° and 30°, more preferably between 20° and 25°.
Preferably said blades are provided in axially spaced groups, the blades in each group being arranged at equally circumferential spacing in a respective horizontal plane. Alternatively said blades may be arranged in a spiral configuration.
Preferably, each group of blades comprise at least two, more preferably at least three equally spaced blades. In one embodiment, each group of blades comprises four equally spaced blades. Preferably respective blades of each group are axially aligned with respective blades of each adjacent group.
In a preferred embodiment, elongate rods are joined to and extend between respective axially aligned blades of each group. Preferably each elongate rod extends substantially parallel to the rotational axis of said shaft of the mixing means. Preferably at least one or more of said elongate rods are joined to the blades at or adjacent an outer end of the blades.
In one embodiment, an elongate rod is joined to and extends between the trailing edges of respective axially aligned blades of each group, preferably at an outer end of each blade.
Preferably one or more further elongate rods are provided extending between leading edges of respective axially aligned blades, preferably joined to said blades at a location between inner and outer ends of each blade.
According to a further aspect of the present invention there is provided a transportable apparatus for on-site preparation of batches of mortar comprising a silo for containing a dry material, such as a mixture of sand and cement, said silo having upper and lower ends, a mixing apparatus for preparing mortar comprising a screw conveyor extending from a lower end of said silo for conveying dry material from the silo to a mixing chamber, said mixing chamber having an inlet end, for receiving dry material from an outlet end of said screw conveyor, an outlet end for dispensing wet material, and a water feed intermediate said inlet and outlet ends for delivering a metered flow or quantity of water into the mixing chamber, mixing means being provided within said mixing chamber for mixing said dry material and water and for controlling the passage of material from said inlet to said outlet end of the mixing chamber, wherein said outlet end of said screw conveyor is located above said inlet end of said mixing chamber such that dry material falls from the outlet end of the screw conveyor into the mixing chamber under gravity.
Preferably said silo is provided with a framework for supporting the silo in a substantially upright orientation with said upper end above said lower end Preferably the apparatus is adapted for transportation by a vehicle with the silo arranged in a horizontal orientation. Preferably said vehicle comprises a horizontal bed with said upper and lower ends of the silo being locatable at or adjacent opposite ends of said bed.
According to a further aspect of the present invention there is provided a method for on-site preparation of batches of mortar comprising conveying dry material, such as a mixture of sand and cement, from a silo to a mixing chamber in a screw conveyor having a screw rotatably driven by a first motor, passing said dry material from an outlet end of said screw conveyor into an inlet end of said mixing chamber under gravity, passing water into said mixing chamber and agitating and conveying the mixture of dry material and water through the mixing chamber by rotation of an agitator within the mixing chamber rotatably driven by a second motor, to deliver wet mixed material from an outlet end of said mixing chamber.
According to a further aspect of the present invention there is provided a mixing apparatus comprising a conveying chamber and a mixing chamber, said conveying chamber being provided with a powered conveying means driven by a first drive means for conveying dry materia' between an ifflet end communicating with a storage vesse' and an ouflet end communicating with an inlet end of the mixing chamber, said mixing chamber being provided with a powered mixing means driven by a second drive means and a water supply means for supplying water to the mixing chamber, whereby said mixing means is ananged to mix said diy material with said water and control the passage of said mixture between said inlet end of the mixing chamber and an outlet end thereof, control means being provided for independently controlling said first and second drive means whereby the flow rate of dry material through the screw conveyor and the flow of wet material through the mixing chamber can be controlled independently.
Preferably said outlet end of said conveying chamber is located above said inlet end of said mixing chamber such that dry mortar falls from the outlet end of the screw conveyor into the mixing chamber under gravity.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-Fig. 1 is a schematic view of a mixing apparatus according to an embodiment of the present invention; Fig. 2 is a side view of the apparatus of Fig. 1; Fig. 3 is a side view of the agitator of the mixing chamber of the mixing apparatus of Fig. 1; and Fig. 4 is an end view of the agitator of Fig. 3.
As illustrated in the drawings, a dry silo mortar system according to the present invention comprises a portable silo 2 mounted on a supporting frame and having a cylindrical upper section (not shown) and a funnel shaped lower section 3 for containing a dry mortar comprising a mixture of sand and cement. The silo 2 is adapted to for transportation by a truck with the silo arranged in a horizontal orientation, the truck having a horizontal bed, the silo being mounted on the bed with the upper and lower ends of the silo being locatable at or adjacent opposite ends of the truck bed. Once delivered to a construction site, the silo is lifted to an upright configuration, resting upon the supporting frame of the silo in a substantially upright orientation with said upper end above said lower end. Alternatively the silo may comprise a substantially permanent structure.
A mixing apparatus 10 is mounted on a lower end of the silo 2 comprising a screw conveyor and a mixing chamber 30. The screw conveyor 20 extends upwardly from a lower end 4 of the silo 2 and comprises a cylindrical passage 22 having a rotary spiral feed screw 24 coaxially mounted therein, the feed screw 24 being rotatable by means of an electric motor 26 connected to an upper end of the screw via a reduction gearbox to convey dry mortar from the silo 2 to the mixing chamber 30. In order to enable removal and servicing of the screw conveyor 20 from the silo 2, a lower region of the passage 22 is separable from the upper region of the passage 22 by a separable flange 28.
The mixing chamber 30 comprises a vertically oriented cylinder 32 having an upper inlet end 35, adapted to receive dry material from an outlet end of the screw conveyor, and an open lower outlet end 36. A rotatable agitator 40 is coaxially mounted within the tube 32 to be rotatable by an electric motor 38 connected to an upper end of the agitator 40 via a reduction gearbox. A water supply passage 39 is provided in a side region of the mixing chamber for delivering a metered flow of water into the mixing chamber, said water supply passage being connectable to a source of water via a metering valve.
Dry material is delivered from an upper end of the screw conveyor 20 into the mixing chamber 30 via a steeply inclined delivery pipe 50 (see Fig. 2) whereby dry material falls from the upper end of the screw conveyor 20 into the mixing chamber 30 under gravity, thus preventing contamination of the dry material within the screw conveyor 20.
The rotatable agitator 40 within the mixing chamber 30 mixes the dry material with water to provide a wet mortar and controls the passage of the mortar through the mixing chamber 30.
The agitator 40 comprises a shaft 41 mounted coaxially within said cylindrical mixing chamber 30 and having a plurality of radially extending mixing blades 42. Each of said blades 42 has a leading edge 43 and a trailing edge 44 with respect to the direction of rotation of the shaft 41, each blade 42 being mounted at an angle or pitch such that the eading edge 43 of each Made 42 is tower than the trailing edge44 thereof whereby the blades 42 convey wet material through the mixing chamber 40 during rotation of the blades 42 and act to retain wet material within the mixing chamber 40 due to the width of the blades 42. In a preferred embodiment each blade is ananged at a pitch angle of 23° to the horizontal, although other angles may be required to suit different materials.
As shown in Figs. 3 and 4, the blades 42 are arranged in axially spaced groups, each group comprising four equally spaced blades. In the embodiment illustrated, eight groups of blades are provided, each group comprising four equally spaced blades. However, more or less groups may be provided, each group having more or less blades, depending upon the size of the mixing chamber and the consistency of the mortar to be produced. Respective blades of each group are axially aligned with respective blades of each adjacent group.
To provide enhanced mixing and control of the movement of the wet mortar through the mixing chamber, elongate rods 45 are joined to and extend between respective axially aligned blades 42 of each group, each elongate rod 45 preferably extends substantially parallel to the rotational axis of said shaft 41 of the agitator. Elongate rods 45 are joined to and extend between the trailing edges 44 of the axially aligned blades 42, preferably joined to the blades 42 adjacent an outer edge thereof. Preferably one or more further elongate rods 46 are provided extending between leading edges 43 of respective axially aligned blades 42, preferably joined to said blades 42 at a location between inner and outer ends of each blade 42.
Electronic control means may be provided for controlling the operation of a the first and second motors and the water supply, such control means being programmable to suit the properties of the mortar to be produced.
In use, when it is desired to dispense a batch of wet mortar, the motor 26 of the screw conveyor 20 is activated to feed dry material into the upper end 35 of the mixing chamber 30 while the metering valve is operated to supply the required flow rate of water into the mixing chamber 30 and the second motor 38 is activated to rotate the agitator 40 at the required speed to mix the dry mortar with the water and to control the passage of the mortar through the mixing chamber 30 and out of the lower outlet 36 of the mixing chamber into a suitable receptacle placed beneath said outlet 36.
By providing separate motors for the screw conveyor 20 and the agitator 40 of the mixing chamber 30, lower power motors can be used and greater motor reliability can be achieved.
Furthermore, the vertical orientation of the mixing chamber 40 minimises the back pressure applied to the second motor 38 as, unlike prior art systems, the agitator does not need to push the wet mortar against the force of gravity, thereby reducing the load on the motor 40.
Once a batch of wet mortar has been dispensed, the apparatus can be cleaned by shutting off the first motor 26 to stop the screw conveyor 20 while maintaining power to the second motor 38 to continue to rotate the agitator while continuing to supply water to the water supply passage 39 to wash out the mixing chamber 30.
The invention is not limited to the embodiment(s) described herein but can be amended or modified without departing from the scope of the present invention.

Claims (26)

  1. Claims 1. A mixing apparatus for preparing mortar comprising a screw conveyor for conveying dry material, such as a mixture of sand and cement, from a storage vessel to a mixing chamber, said mixing chamber having an inlet end, adapted to receive dry material from an outlet end of said screw conveyor, an outlet end for dispensing wet mortar, and a water feed intermediate said inlet and outlet ends for delivering a metered flow or quantity of water into the mixing chamber, mixing means being provided within said mixing chamber for mixing said dry material and water and for controlling the passage of material from said inlet to said outlet end of the mixing chamber, wherein said outlet end of said screw conveyor is located above said inlet end of said mixing chamber such that dry material falls from the outlet end of the screw conveyor into the mixing chamber under gravity, whereby separation is maintained between the dry material in the screw conveyor and the wet material in the mixing chamber.
    Q
  2. 2. An apparatus as claimed in claim 2, wherein the outlet end of the screw container Lt) communicates with the inlet end of the mixing chamber via a vertical or steeply inclined Q passage extending therebetween in a downwardly extending direction. (\J
  3. 3. An apparatus as claimed in claim 1 or claim 2, wherein an auger or screw of said screw conveyor is rotatable by means of a first motor, said mixing means of said mixing chamber being rotatable by means of a second motor, said first and second motors being controllable independently whereby the flow rate of dry material through the screw conveyor and the flow of wet material through the mixing chamber can be controlled independently.
  4. 4. An apparatus as claimed in claim 3, wherein said first and second motors comprise electric motors.
  5. 5. An apparatus as claimed in claim 3 or claims 4, wherein said motors are connected to the respective shafts of the screw conveyor and mixing means by suitable reduction gears.
  6. 6. An apparatuas as claimed in any preceding claim, wherein said screw conveyor is mounted in an upwardly inclined configuration, thereby enabling the mixing chamber to be positioned at a height independent of the position of the storage vessel.
  7. 7. An apparatuas as claimed in any preceding claim, wherein said mixing chamber comprises a cylindrical chamber, said mixing means being rotatably mounted within said chamber for rotation about a rotational axis coaxial with the axis of said cylindrical chamber.
  8. 8. An apparatus as claimed in any preceding claim, wherein said mixing chamber is arranged in an inclined, vertical or substantially vertical orientation with said inlet end at an upper end and said outlet end at a lower end, said mixing means being arranged to control the passage of material through the mixing chamber.
  9. 9. An apparatus as claimed in claim 8, wherein said mixing means comprises a shaft Q mounted coaxially within said cylindrical mixing chamber and having a plurality of radially extending mixing blades.
  10. 10. An apparatus as claimed in claim 9, wherein each of said blades has a leading edge and a trailing edge with respect to the direction of rotation of the shaft of the mixing means, each blade being mounted at an angle or pitch such that the leading edge of each blade is lower than the trailing edge thereof whereby the blades convey wet material through the mixing chamber during rotation of the blades.
  11. 11. An apparatus as claimed in claim 10, wherein each blade has a pitch of between 20° and 30°.
  12. 12. An apparatus as claimed in claim 11, wherein each blade has a pitch of between 20° and 25°.
  13. 13. An apparatus as claimed in any of claims 9 to 12, wherein said blades are provided in axially spaced groups, the blades in each group being arranged at equally circumferential spacing in a respective horizontal plane.
  14. 14. An apparatus as claimed in claim 13, wherein each group of blades comprise at least two, more preferably at least three equally spaced blades.
  15. 15. An apparatus as claimed in claim 13, wherein each group of blades comprises four equally spaced blades.
  16. 16. An appparatus as claimed in any of claims 13 to 15, wherein respective blades of each group are axially aligned with respective blades of each adjacent group.
  17. 17. An apparatuas as claimed in claim 16, wherein elongate rods are joined to and extend between respective axially aligned blades of each group.
  18. 18. An apparatus as claimed in claim 17, wherein each elongate rod extends substantially parallel to the rotational axis of said shaft of the mixing means.
    Q
  19. 19. An apparatus as claimed in claim 17 or claim 18, wherein at least one or more of said Lt) elongate rods are joined to the blades at or adjacent an outer end of the blades.
    (\J
  20. 20. An apparatus as claimed in any of claims 17 to 19, wherein an elongate rod is joined to and extends between the trailing edges of respective axially aligned blades of each group.
  21. 21. An apparatus as claimed in claim 20, wherein one or more further elongate rods are provided extending between leading edges of respective axially aligned blades, preferably joined to said blades at a location between inner and outer ends of each blade.
  22. 22. An apparatus as claimed in claim 13, wherein said blades are arranged in a spiral configuration.
  23. 23. A transportable apparatus for on-site preparation of batches of mortar comprising a silo for containing a dry material, such as a mixture of sand and cement, said silo having upper and lower ends, a mixing apparatus for preparing mortar comprising a screw conveyor extending from a lower end of said silo for conveying dry material from the silo to a mixing chamber, said mixing chamber having an inlet end, for receiving dry material from an outlet end of said screw conveyor, an outlet end for dispensing wet material, and a water feed intermediate said inlet and outlet ends for delivering a metered flow or quantity of water into the mixing chamber, mixing means being provided within said mixing chamber for mixing said dry material and water and for controlling the passage of material from said inlet to said outlet end of the mixing chamber, wherein said outlet end of said screw conveyor is located above said inlet end of said mixing chamber such that dry material falls from the outlet end of the screw conveyor into the mixing chamber under gravity.
  24. 24. An apparatus as claimed in claim 23, wherein said silo is provided with a framework for supporting the silo in a substantially upright orientation with said upper end above said lower end
  25. 25. An apparatus as claimed in claim 24, wherein the apparatus is adapted for transportation by a vehicle with the silo arranged in a horizontal orientation. 0)15Q
  26. 26. An apparatus as claimed in claim 25, wherein said vehicle comprises a horizontal L.() bed with said upper and lower ends of the silo being locatable at or adjacent opposite ends of Q said bed. (\J27. A method for on-site preparation of batches of mortar comprising conveying dry material, such as a mixture of sand and cement, from a silo to a mixing chamber in a screw conveyor having a screw rotatably driven by a first motor, passing said dry material from an outlet end of said screw conveyor into an inlet end of said mixing chamber under gravity, passing water into said mixing chamber and agitating and conveying the mixture of dry material and water through the mixing chamber by rotation of an agitator within the mixing chamber rotatably driven by a second motor, to deliver wet mixed material from an outlet end of said mixing chamber.28. A mixing apparatus comprising a conveying chamber and a mixing chamber, said conveying chamber being provided with a powered conveying means driven by a first drive means for conveying dry material between an inlet end communicating with a storage vessel and an outlet end communicating with an inlet end of the mixing chamber, said mixing chamber being provided with a powered mixing means driven by a second drive means and a water supply means for supplying water to the mixing chamber, whereby said mixing means is arranged to mix said dry material with said water and control the passage of said mixture between said inlet end of the mixing chamber and an outlet end thereof, control means being provided for independently controlling said first and second drive means whereby the flow rate of dry material through the screw conveyor and the flow of wet material through the mixing chamber can be controlled independently.29. An apparatus as claimed in claim 28, wherein said outlet end of said conveying chamber is located above said inlet end of said mixing chamber such that dry mortar falls from the outlet end of the screw conveyor into the mixing chamber under gravity. a) L() (\J
GB0808724A 2008-05-14 2008-05-14 Mixing chamber and screw conveyor for preparing mortar Withdrawn GB2459928A (en)

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Cited By (5)

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CN102431095A (en) * 2011-07-28 2012-05-02 东莞市彩丽建筑维护技术有限公司 Mortar material storage method for mortar pump machine and mortar material storage device
CN102514097A (en) * 2011-11-23 2012-06-27 中国石油集团川庆钻探工程有限公司长庆固井公司 Automatic ash mixing and stirring control system for cement dry-mixing station
CN103552153A (en) * 2013-10-31 2014-02-05 平萍 Segregation prevention method for ready mixed mortar
CN106182416A (en) * 2016-07-14 2016-12-07 安庆里外里工业产品设计有限公司 A kind of building plumbing system burying pipeline intelligent robot mixing device
WO2018192824A1 (en) * 2017-04-19 2018-10-25 Rigid Mixers Limited Mixing apparatus and method for preparing mortar

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CN113802631A (en) * 2021-10-19 2021-12-17 福建省立新船舶工程有限公司 Self-suction sand dredger
CN114559550B (en) * 2022-02-08 2023-07-28 陈玲 Novel cement stabilized macadam equipment

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