GB2090761A - Mixing apparatus - Google Patents

Mixing apparatus Download PDF

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Publication number
GB2090761A
GB2090761A GB8100206A GB8100206A GB2090761A GB 2090761 A GB2090761 A GB 2090761A GB 8100206 A GB8100206 A GB 8100206A GB 8100206 A GB8100206 A GB 8100206A GB 2090761 A GB2090761 A GB 2090761A
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GB
United Kingdom
Prior art keywords
mixing apparatus
mixer
rotor
feed
shaft
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
GB8100206A
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GB2090761B (en
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.)
POWER SPRAYS Ltd
Original Assignee
POWER SPRAYS Ltd
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 POWER SPRAYS Ltd filed Critical POWER SPRAYS Ltd
Priority to GB8100206A priority Critical patent/GB2090761B/en
Publication of GB2090761A publication Critical patent/GB2090761A/en
Application granted granted Critical
Publication of GB2090761B publication Critical patent/GB2090761B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • 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
    • 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
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2123—Shafts with both stirring means and feeding or discharging means
    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/805—Mixing plants; Combinations of mixers for granular material
    • 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
    • B01F35/71—Feed mechanisms
    • B01F35/712—Feed mechanisms for feeding fluids
    • 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
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/7544—Discharge mechanisms characterised by the means for discharging the components from the mixer using pumps
    • 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
    • B01F35/892—Forming a predetermined ratio of the substances to be mixed for solid materials, e.g. using belts, vibrations, hoppers with variable outlets or hoppers with rotating elements, e.g. screws, at their outlet
    • 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
    • B28C9/0454—Self-contained units, i.e. mobile plants having storage containers for the ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids
    • 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
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough
    • 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
    • B01F35/71—Feed mechanisms

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The invention relates to a mixing apparatus having a plurality of hoppers 12, 13 each provided with a feed-screw device 17, 18 which discharge through a common outlet duct 29 into the inlet duct 30 of a two-stage mixing apparatus 31, the first stage of which has a water supply 51.The screw devices 17, 18 are driven through variable speed gear units and each supply a metered quantity of material to the mixer 31. <IMAGE>

Description

SPECIFICATION Mixing apparatus This invention relates to mixing apparatus for mixing together a plurality of substances, and particularly, but not exclusively, mixing apparatus for producing concrete or the like.
According to the present invention there is provided mixing apparatus for mixing together a plurality of substances, comprising a feed-screw device for each of the substances to be mixed and a mixer device arranged to be supplied with metered quantities of said substances by each feed-screw device.
Preferably a hopper for one of the substances is mounted above each respective feed-screw device and at least one said hopper is provided with a vibrator means for vibrating the said one hopper.
Said one hopper is preferably provided in its interior with a horizontally inclined baffle plate spaced from the end walls of the hopper.
Preferably at least one of the feed-screw devices has two propelling elements of different propelling efficiency.
One of the propelling elements of said one feed-screw device preferably comprises a first helical member which extends around and is radially spaced from a longitudinal drive shaft on which the member is fixedly mounted and a second helical member which extends from the periphery of said drive shaft, said helical members and shaft being contained in a longitudinal bore of a casing having an inlet and an outlet.
Preferably the mixer device comprises a first stage mixer whose inlet is connected to the outlet of each of the feed-screw devices and whose outlet is connected to the inlet of a second stage mixer, each stage having a rotor and said rotors being rotatable in the same direction of rotation.
An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic perspective view of a mixing apparatus according to the present invention, partly cut-away to show details, Figure 2 is a perspective view of the feed-screw devices and mixer device, Figure 3 is a cross-section through the hopper device, Figure 4 is a perspective view of the rotor of one feed-screw device, Figure 5 is a perspective view of the rotor of the other feed-screw device, Figure 6 is a perspective view of the rotor of the first stage of the mixer device, and Figure 7 is a perspective view of the rotor of the second stage of the mixer device.
The mixing apparatus comprises a frame structure 10 on which all ofthe component parts of the apparatus are mounted, the frame structure 10 being provided with wheels 11.
Mounted on the frame structure 10 are hoppers 12 and 13forthe materials to be mixed. Such materials may comprise those required to produce glass reinforced concrete but they may comprise other materials, such as rapid setting materials. The dry materials are loaded into the respective hoppers 12 or 13 either from bags or by bulk conveyors from a storage silo. Purely for the purposes of describing the apparatus the materials will be described as sand and cement materials, the hopper 12 containing the sand and the hopper 13 containing the cement. Both of the hoppers 12 and 13 are provided with a transverse screen 14. The hopper 13 is provided with an inclined baffle plate 15 and a tuned vibrator 16 is mounted on the exterior of the hopper 13.The plate 15 is inclined at an angle with respect to the horizontal and the plate 15 is spaced from the end walls of the hopper 13. The plate 15 and vibrator 16 ensure that the powdered or granular material in the hopper 13 does not compact and form a bridge of material in the hopper 13 which could lead to inadequate feed of material from the hopper 13.
At the bottom of the hopper 12 is located a feed-screw device 17 and at the bottom of the hopper 12 is located a feed-screw device 18. The rate of delivery of each feed-screw device 17, 18 is directly proportional to its rotational speed. Each feed-screw device 17, 18 is driven by a respective variable speed gear unit 19 and 20 driven by an electric motor 21.
The feed-screw device 18 has a rotor shaft 22 (Figure 4) provided with two propelling elements of different propelling efficiency, one element comprising an open helical member 23 which surroundss the shaft 22 and is radially spaced from the shaft 22, and the other element comprising a helical blade 24 which extends from the shaft 22. The helical member 23 and the helical blade 24 combine to remove material from the hopper 13 and rotate in a bore of a casing 25. The combination of the feed-screw device 18 and the baffle plate 15 and vibrator 16 all acting in conjunction provide a metering accuracy of plus or minus 1%.Known metering feed devices which use a vibrating cone or which are vibrated as a whole to remove any head effects and cause the material to collapse into a feed-screw suffer from the defect that too much vibration compacts the material resulting in unreliable delivery and poor accuracy.
The feed-screw device 17 has a rotor shaft 26 (Figure 5) provided with a propelling element comprising an open helical member 27 which surrounds and is radially spaced from the shaft 26. A cylindrical plug 28 is provided on the shaft 26 at the outlet end of the device 17 in order to prevent the free flow of sand through the outlet when the feed-screw 17 is not rotating.
The variable speed gear units 19 and 20 allow any mix ratio to be selected in conjunction with R.P.M.
displays and a calibration chart.
The dry materials from the feed-screw devices 17, 18 are supplied to a common outlet duct 29 which is vertically aligned with an inlet duct 30 of a two-stage mixer device 31 which comprises a first stage mixer 32 and a second stage mixer 33 which are located below the feed-screw devices 17, 18. The rotor 34 of the mixer stage 32 is driven in the same direction of rotation as the rotor 35 of the mixer stage 33 by a motor 36 and a gear box 37 which enables the rotor 35 to be driven approximately 10% faster than the rotor 34.
The rotor 34 (Figure 6) comprises a shaft 38 on which is mounted an open helical member 39 which surrounds the shaft 38 and is radially spaced therefrom. Provided on the shaft 38 are a plurality of mixing blades 40 which are crescent shaped and have a stem 41 which extends radially through the shaft 38 and is provided with a retaining nut 42. At one end of the shaft 38 there is provided a blade 43 which extends in the opposite direction and which serves to move material away from the end of the rotor 34 and thus away from the end bearing of the rotor 34 towards an outlet which communicates with a transfer duct 44 between the two stages 32 and 33.
Contamination of the end bearing is also prevented by having a labyrinth type seal 45 and a grease seal (not shown) within the bearing housing.
The rotor 35 of the second stage mixer 33 comprises a shaft 46 (Figure 7) provided with crescent shaped mixing blades 47 which are identical in shape with the blades 40 but which extend in the opposite direction relative to the blades 40. The shaft 46 is provided at one end with a blade 48 which extends in the opposite direction to the blades 47 and serves to move material away from the end of the rotor 35 and thus away from the end bearing of the rotor 35. A labyrinth type seal 49 is also provided.
The second stage mixer 33 has an outlet 50.
The first stage mixer 32 is provided with an inlet 51 connected to a conduit 52 supplied with water from a water storage tank 53 by a pump. The water may be provided with additives.
The outlet 50 of the second stage mixer 33 communicates with an inlet duct 54 of a pump 55 driven by a variable speed drive unit 56 having a motor 57.
In use of the mixing apparatus the sand and cement are supplied by the feed-screw devices 17, 18 in metered quantities to the two stage mixer 31.
The dry materials gravitate from the feed-screws 17, 18 via the outlet duct 29 into the duct 30 and flow into the rotating helical member 27 of the rotor of the first stage mixer 32. The helical member 27 propells the material in an axial direction without throwing material backwards despite rotating at high speeds.
The materials are partly mixed together by the helical member 27 and by the first two blades 40 on the rotor 34. The mixed material is then mixed with water and conveyed by all the remaining blades 40.
There is a high degree of shear within the mix caused by the motion of the blades 40 relative to the casing wall and the clearance over the top of the blades 40. Due to the high rotational speed all the wet ingredients are thrown by centrifugal force against the casing wall so that there is produced a velocity gradient through the film of mix, the velocity being at a maximum atthe diameter swept by the tips of the blades 40 and at a minimum adjacent to the casing wall.
High shear action with use of abrasive materials can lead to rapid wear of the blades 40 and therefore they can be protected by applying a covering of wear resistent material to the blades 40 and blades 47.
There is little or no wear of the casing wall due to the velocity gradient.
The whole assembly of mixing apparatus is quickly removable from its drives, and the bearing housings have a bayonet action retaining arrangement for ease of removal for cleaning. Normal shut-down requires water pumping via the water inlet connection 51 without removing the feed-screw devices 17 and 18, but it may be necessary to have a full strip-down at the end of each days use.
The apparatus provides a compact high speed mixer giving "high shear" mixing with low transience time (approx. 10 seconds) and is suitable for use with rapid setting materials such as Schnell Zement, Fondu cements, "Jet Cem" for example; gypsum and piaster as well as conventional cement mixes and various aggregate and fillers. The apparatus can be used with ceramic materials.
The apparatus can produce grouts and slurries with low water to cement ratios which are difficult or impossible to mix in known batch mixers owing to the risk of the material setting off during the mixing cycle.
By means of the pump 55 it is possible to pump the mixed material and spray it immediately. This is useful for spraying operations where heavy deposits are required to be projected onto vertical and or overhanging surfaces, and where high strength (i.e.
high shear mixed and lowwater/cement ratio) mortar is beneficial such as for tunnel lining, pipe repairs etc.
The apparatus provides a continuous 24 hours per day process of mixing and is compact and contains very little material at any instant. Typical output for a 4 inch diameter tube is preferably 35 Kg per minute, with a maximum of about 50 Kg per minute. The machine may contain less than 0.5 Kg of wetted material at any instant.
The pump 55 is synchronised to the rate of mix delivered by the mixer 31 and is used to convey material through a hose to a spray gun or distributing system.
It is of course possible to have more than two hoppers and more than two feed-screw devices.

Claims (23)

1. Mixing apparatus for mixing together a plurality of substances, comprising a feed-screw device for each of the substances to be mixed and a mixer device arranged to be supplied with metered quantities of said substances by each feed-screw device.
2. Mixing apparatus as claimed in claim 1, in which a hopper for one of the substances is mounted above each respective feed-screw device and at least one said hopper is provided with a vibrator means for vibrating the said one hopper.
3. Mixing apparatus as claimed in claim 2, in which said one hopper is provided in its interior with a horizontally inclined baffle plate spaced from the end walls of the hopper.
4. Mixing apparatus as claimed in any preceding claim, in which the feed-screw devices are driven through variable speed gear units.
5. Mixing apparatus as claimed in any preceding claim, in which at least one of the feed-screw devices has two propelling elements of different propelling efficiency.
6. Mixing apparatus as claimed in claim 5, in which one propelling element comprises a first helical member which extends around and is radially spaced from a longitudinal drive shaft on which the member is fixedly mounted and a second helical member which extends from the periphery of said drive shaft, said helical members and shaft being contained in a longitudinal bore of a casing having an inlet and an outlet.
7. Mixing apparatus as claimed in any preceding claim, in which at least one of the feed-screw devices comprises a helical member which extends around and is radially spaced from a longitudinal drive shaft on which the helical member is fixedly mounted, said helical member and shaft being contained in a longitudinal bore of a casing having an inlet and an outlet.
8. Mixing apparatus as claimed in claim 6 or claim 7, in which at the outlet end the drive shaft is provided with an enlarged diameter portion to prevent the free flow of material through the feedscrew device when the device is inoperative.
9. Mixing apparatus as claimed in claim 8, in which said enlarged diameter portion is formed by a cylindrical plug member fixed to the drive shaft.
10. Mixing apparatus as claimed in any preceding claim, in which the mixer device comprises a two-stage mixer device.
11. Mixing apparatus as claimed in claim 10, in which the mixer device comprises a first stage mixer whose inlet is connected to the outlet of each of the feed-screw devices and whose outlet is connected to the inlet of a second stage mixer, each stage having a rotor and said rotors being rotatable in the same direction of rotation.
12. Mixing apparatus as claimed in claim 11, in which the rotor of the second stage mixer is arranged to be rotated at a higher speed than the rotor of the first stage mixer.
13. Mixing apparatus as claimed in claim 11 or claim 12, in which the rotors of the mixer device each comprise a rotor shaft provided with blades mounted thereon in a detachable manner.
14. Mixing apparatus as claimed in claim 13, in which the blades provided on the rotor of the first stage mixer extend in the opposite direction to those on the rotor of the second stage mixer.
15. Mixing apparatus as claimed in claim 13 or claim 14 in which each detachable blade comprises a crescent shaped blade having a stem portion which extends transversely through the rotor and is secured thereto by a nut.
16. Mixing apparatus as claimed in any of claims 13 to 15, in which the rotor shaft of the first stage mixer is also provided with a helical member which extends around and is radially spaced from the shaft.
17. Mixing apparatus as claimed in any of claims 11 to 16, in which at the outlet end each rotor shaft of the mixer is provided a blade which in use of the mixer moves material away from the end bearing of the rotor shaft.
18. Mixing apparatus as claimed in any of claims 10 to 17, in which the first stage mixer includes means for introducing liquid into the mixer.
19. Mixing apparatus as claimed in any of claims 13 to 18, in which each detachable blade is provided with a covering of wear resistent material.
20. Mixing apparatus as claimed in any preceding claim, including a pump arranged to receive the mixed materials from the mixer and for feeding the mixed material to a discharge conduit.
21. Mixing apparatus as claimed in claim 20, in which the conduit comprises a hose.
22. Mixing apparatus as claimed in claim 20 or claim 21, in which the pump is driven by a variable speed drive unit.
23. Mixing apparatus for mixing together a plurality of substances, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB8100206A 1981-01-06 1981-01-06 Mixing apparatus Expired GB2090761B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8100206A GB2090761B (en) 1981-01-06 1981-01-06 Mixing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8100206A GB2090761B (en) 1981-01-06 1981-01-06 Mixing apparatus

Publications (2)

Publication Number Publication Date
GB2090761A true GB2090761A (en) 1982-07-21
GB2090761B GB2090761B (en) 1984-12-12

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669886A (en) * 1984-03-13 1987-06-02 B.M.I. B.V. Apparatus for preparing a mixture
WO1987005255A1 (en) * 1986-02-27 1987-09-11 Pharmakopius Limited Blending particulate materials
US4922463A (en) * 1988-08-22 1990-05-01 Del Zotto Manufacturing Co. Portable volumetric concrete mixer/silo
EP0435484A1 (en) * 1989-12-04 1991-07-03 Baker Hughes Incorporated Method and apparatus for direct high velocity preparation of completion/workover systems
EP0482930A2 (en) * 1990-10-24 1992-04-29 Baker Hughes Incorporated Mixing apparatus
US5354127A (en) * 1990-04-10 1994-10-11 William Del Zotto Segmented mixing auger
US5358331A (en) * 1986-02-27 1994-10-25 John William Cruse Blending device for particulate material, with helical conveyer
EP0628247A2 (en) * 1993-06-07 1994-12-14 CRESTANI F., PRETO MARTINI F., PRETO MARTINI C., TONIOLO F., FERRARI L. trading as CRES.CO S.n.c. di CRESTANI, PRETO E C. Mixing and dosage device for farm feed
EP0761402A2 (en) * 1995-09-05 1997-03-12 INOTEC GmbH Transport- und Fördersysteme Mortar mixing machine
WO1997025261A1 (en) * 1996-01-12 1997-07-17 Koch Marmorit Gmbh Container for flowing or pourable materials especially for plaster, mortar etc.
WO1997026121A1 (en) * 1996-01-18 1997-07-24 Bayosan Wachter Gmbh & Co. Kg Process for manufacturing of pourable and/or pumpable building materials, especially pourable toppings

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669886A (en) * 1984-03-13 1987-06-02 B.M.I. B.V. Apparatus for preparing a mixture
WO1987005255A1 (en) * 1986-02-27 1987-09-11 Pharmakopius Limited Blending particulate materials
US5358331A (en) * 1986-02-27 1994-10-25 John William Cruse Blending device for particulate material, with helical conveyer
US4922463A (en) * 1988-08-22 1990-05-01 Del Zotto Manufacturing Co. Portable volumetric concrete mixer/silo
EP0435484A1 (en) * 1989-12-04 1991-07-03 Baker Hughes Incorporated Method and apparatus for direct high velocity preparation of completion/workover systems
US5354127A (en) * 1990-04-10 1994-10-11 William Del Zotto Segmented mixing auger
EP0482930A3 (en) * 1990-10-24 1992-08-05 Baker-Hughes Incorporated Mixing apparatus
EP0482930A2 (en) * 1990-10-24 1992-04-29 Baker Hughes Incorporated Mixing apparatus
EP0628247A2 (en) * 1993-06-07 1994-12-14 CRESTANI F., PRETO MARTINI F., PRETO MARTINI C., TONIOLO F., FERRARI L. trading as CRES.CO S.n.c. di CRESTANI, PRETO E C. Mixing and dosage device for farm feed
EP0628247A3 (en) * 1993-06-07 1995-04-19 Crestani Flavio Preto Martini Mixing and dosage device for farm feed.
EP0761402A2 (en) * 1995-09-05 1997-03-12 INOTEC GmbH Transport- und Fördersysteme Mortar mixing machine
EP0761402A3 (en) * 1995-09-05 1997-05-02 Inotec Gmbh Mortar mixing machine
US5752769A (en) * 1995-09-05 1998-05-19 INOTEC GmbH Transport- und Fordersysteme Mortar mixing machine with two conveying and mixing tubes of opposite conveying direction
WO1997025261A1 (en) * 1996-01-12 1997-07-17 Koch Marmorit Gmbh Container for flowing or pourable materials especially for plaster, mortar etc.
WO1997026121A1 (en) * 1996-01-18 1997-07-24 Bayosan Wachter Gmbh & Co. Kg Process for manufacturing of pourable and/or pumpable building materials, especially pourable toppings

Also Published As

Publication number Publication date
GB2090761B (en) 1984-12-12

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