AU2021106844B4 - Cementitious product applicator - Google Patents

Cementitious product applicator Download PDF

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Publication number
AU2021106844B4
AU2021106844B4 AU2021106844A AU2021106844A AU2021106844B4 AU 2021106844 B4 AU2021106844 B4 AU 2021106844B4 AU 2021106844 A AU2021106844 A AU 2021106844A AU 2021106844 A AU2021106844 A AU 2021106844A AU 2021106844 B4 AU2021106844 B4 AU 2021106844B4
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AU
Australia
Prior art keywords
hopper
cementitious
cementitious product
dry
pump
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AU2021106844A
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AU2021106844A4 (en
Inventor
Anthony Foote
Breeanna Mallon
Daniel Nicholson
Gregory Norris
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.)
Ventsec Pty Ltd
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Ventsec Pty 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
Priority claimed from AU2021902618A external-priority patent/AU2021902618A0/en
Application filed by Ventsec Pty Ltd filed Critical Ventsec Pty Ltd
Publication of AU2021106844A4 publication Critical patent/AU2021106844A4/en
Application granted granted Critical
Publication of AU2021106844B4 publication Critical patent/AU2021106844B4/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • 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
    • B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
    • B28C7/067—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of stationary hoppers, chambers or bins from which the material is fed gravitationally, e.g. having agitating means therein
    • 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
    • B28C5/0806—Details; Accessories
    • B28C5/0856—Supporting frames or structures, e.g. supporting wheels
    • 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
    • B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G21/0418—Devices for both conveying and distributing with distribution hose

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Nozzles (AREA)

Abstract

Cementitious product applicator Abstract A cementitious product applicator (100) comprises a portable frame (110), a hopper (52), a mixing device (54), a spray nozzle (58) and a pump (55). The hopper (52) is mounted on the frame (110) and adapted to receive a dry cementitious material. The mixing device (54) is mounted on the frame (110) and has a motor (60) and a mixing chamber (62). The mixing device (54) is adapted to receive water and the dry cementitious material from the hopper (52) and mix them to form a wet cementitious product. The pump (55) is adapted to pump the wet cementitious product from the mixing device (54) to the spray nozzle (58) and the spray nozzle (58) is adapted to spray the wet cementitious product onto a target surface or structure. The hopper (52) is fully enclosed by a hopper hood (130) having a feed control device (150) for selectively receiving dry cementitious material from a dry cementitious material source.

Description

AUSTRALIA
Patents Act 1990
Innovation Patent Specification
Title: Cementitious product applicator
Applicant(s): VentSec Pty Ltd
Inventor(s): Daniel Alan Nicholson Anthony Terence Foote Gregory James Norris Breeanna Grace Mallon
Agent: © COTTERS Patent & Trade Mark Attorneys
The following is a full description of the invention which sets forth the best method known to the applicant of performing it.
Cementitious product applicator
Cross-reference to Related Application
[0001] The present application is related to Australian Provisional Patent Application No. 2021902618, entitled "Cementitious product applicator" and filed on 20 August 2021 in the name of VentSec Pty Ltd, the entire content of which is incorporated herein by reference as if fully set forth herewith.
Technical Field
[0002] The present disclosure relates to a cementitious product applicator. In particular, the present invention relates to a wet cementitious product applicator for use in underground mining applications, such as for applying cementitious product to mine surfaces or structures for strata consolidation or for ventilation structures.
Background of the Invention
[0003] Cementitious materials, such as cement, grout, shotcrete, and plasters, can be applied to surfaces using known spray applicators. Shotcrete and plaster applicators are known and used for various applications that require the spraying of a sealing product onto a surface. Existing shotcrete applicators typically have open hoppers into which dry cement or dry plaster is loaded and the dry cement or dry plaster is pumped to a spray nozzle where it is mixed with water as the sealing product is sprayed from the nozzle.
[0004] The operation of existing shotcrete applicators produces a large amount of airborne cement dust particles both from the open hopper and as the cement is mixed with water and sprayed at the spray nozzle. Cement dust particles are hazardous to human health if breathed into the lungs and operators of existing shotcrete applicators are required to wear a respirator and safety goggles in order to avoid the potentially harmful effects of the airborne cement dust. The process of loading dry product into a hopper for a sealing product applicator also produces a large amount of dust. If the dry product is loaded from a suspended bulk bag, then there is also a suspended load risk to the operators.
[0005] Shotcrete has useful applications for sealing walls of underground mines. However, due to the low levels of ventilation in underground mines, there are prescribed limitations on dust generation in underground mines. Consequently, conventional shotcrete applicators are unsuitable for use in underground mines, without significantly cumbersome control protocols implemented.
[0006] Electric power and motors also pose a problem in underground mining operations due to ignition risk from sparking. This typically precludes electrically powered shotcrete applicators from being used in underground mining operations.
Object of the Invention
[0007] It is an object of the present invention to substantially overcome or at least ameliorate one or more of the above disadvantages, or to provide a useful alternative.
Summary of the Invention
[0008] In a first aspect, the present invention provides a cementitious product applicator adapted to convert a dry cementitious material and water into a wet cementitious product and to project the wet cementitious product onto a target surface or structure, the cementitious product applicator comprising: a portable frame; a hopper mounted on the frame and adapted to receive a dry cementitious material; a mixing device mounted on the frame having a motor and a mixing chamber, the mixing device being adapted to receive water and the dry cementitious material from the hopper and mix them to form a wet cementitious product; a spray nozzle adapted to spray wet cementitious product onto the target surface or structure; and a pump adapted to pump the wet cementitious product from the mixing device to the spray nozzle; wherein the hopper is fully enclosed by a hopper hood having a feed control device for selectively receiving the dry cementitious material from a dry cementitious material source.
[0009] Preferably, the mixing device and pump are powered by a pneumatic or hydraulic motor.
[0010] In a preferred embodiment, compressed air is used to power the mixing device and the pump and is also supplied to the spray nozzle to project the wet cementitious product from the spray nozzle.
[0011] Preferably, the feed control device comprises a valve mechanism that can be operated between an open and closed position to throttle the flow of dry cementitious material and control the amount of dry cementitious material entering the hopper.
[0012] Further preferably, the feed control device has a body defining an internal throat that is adapted to connect the dry cementitious material source to the hopper, the valve mechanism being located in the throat and able to selectively open and close the throat.
[0013] Further preferably, the valve mechanism is actuated by a mechanism mounted externally on the body of the of the feed control device, the mechanism comprising a shaft passing through the body of the feed control device, a crank connected to the shaft, a nut pivotally connected to the crank, and a rotatable threaded shaft on which the nut can travel.
[0014] Further preferably, the threaded shaft is mounted on the body of the feed control device via a bearing comprising a ball joint mounted sleeve.
[0015] The cementitious product applicator preferably further comprises a dust scrubber chamber in fluid communication with the hopper and adapted to receive dust laden air from the hopper and clean the air by passing it through water in the dust scrubber chamber.
[0016] Preferably, the clean air exiting the dust scrubber chamber is recirculated back into the hopper.
[0017] In a preferred embodiment, the portable frame includes a bulk bag guard frame proximal to the feed control device and extending above the top of the feed control device, the guard frame adapted to protect an operator from the dry cementitious material source, being a bulk bag suspended over the feed control device.
[0018] Preferably, the portable frame includes a motor guard frame projecting above the height of the motor to protect the motor from impacts.
[0019] Further preferably, at least one gauge is mounted on the motor guard frame to display at least one of the pump speed and the dry cementitious material feed speed.
[0020] The cementitious product applicator preferably further comprises a control panel provided on the portable frame, the control panel having controls for controlling the pump speed, the water flow rate, and the air pressure.
[0021] Preferably, the frame includes forklift pockets in a base of the frame to allow the cementitious product applicator to be moved with a forklift or other heavy lifting machine.
Brief Description of the Drawings
[0022] A preferred embodiment of the invention will now be described by way of specific example with reference to the accompanying drawings, in which:
[0023] Fig. 1 is a schematic depicting a cementitious product applicator;
[0024] Fig. 2 depicts a cementitious product applicator;
[0025] Figs 3 to 5 depict the cementitious product applicator of Fig. 2 with the mixing pump applicator removed;
[0026] Fig. 6 depicts a hopper hood of the cementitious product applicator of Fig. 2;
[0027] Fig. 7 is a cross sectional view of the hopper hood of Fig. 6;
[0028] Figs 8 and 9 depict a feed control device of the cementitious product applicator of Fig. 2;
[0029] Fig. 10 is a cross-sectional view of the feed control device of Fig. 8;
[0030] Figs 11 and 12 depict a scrubber box of the cementitious product applicator of Fig. 2; and
[0031] Fig. 13 is a cross-sectional view of the scrubber box of Fig. 11.
Detailed Description of the Preferred Embodiments
[0032] The present disclosure provides a cementitious product applicator for spraying a wet cementitious product that produces minimal dust and can operate in flammable environments.
[0033] In one embodiment, depicted schematically in Fig. 1, the cementitious product applicator (100) comprises a housing (105) supporting a mixing pump applicator (50). The housing (105) comprises a frame (110), a hopper hood (130), and a dust scrubber box (190). The mixing pump applicator (50) comprises a hopper (52), a mixing device (54), a pump (55), an output hose (56), and a spray nozzle (58).
[0034] In the embodiment described, depicted in Fig. 2, the mixing pump applicator (50) comprises an existing electrical mixing pump product, such as the PFT G4TM mixing pump manufactured and sold by Antec Group Pty Limited, modified to run on pneumatic or hydraulic power rather than electrical power. This involves replacing the electric motor and gearboxes with a pneumatic motor and gearboxes. Alternatively, the electric motor and gearboxes can be replaced with a hydraulic motor and gearboxes. The dry product hopper (52) of the mixing pump applicator (50) feeds dry cementitious material via a starwheel (53) at the base of the hopper (52) to the mixing device (54). The mixing device (54) has a motor (60), a mixing chamber (62), a water inlet (64), and an agitator (66) for mixing the dry cementitious material and water to create a wet cementitious product. The wet cementitious product is then pumped via a pump (55), such as a screw auger, from the mixing device (54) to the spray nozzle (58) via the output hose (56). Compressed air is injected at the spray nozzle (58) to project the wet cementitious product out of the spray nozzle (58).
[0035] The housing (105) of the cementitious product applicator (100) is depicted in Figs 3 to 5 with the mixing pump applicator (50) removed. The housing (105) includes a frame (110) onto which the mixing pump applicator (50), can be mounted. The motor (60) of the mixing device (54) is mounted on a pivotally mounted motor plate (68) having a handle (70), with the mixing chamber (62) arranged below the motor plate (68). This allows the motor (60) to be pivoted away from the mixing chamber (62) to allow access to the mixing chamber (62) and agitator (66) for cleaning and maintenance purposes.
[0036] The hopper hood (130) and the scrubber box (190) are also mounted on the frame (110). The frame (110) includes a bulk bag guard frame (112) for supporting a dry cementitious material source, such as a bulk bag of dry cementitious material, above the hopper hood (130). The frame (110) also includes an A-frame shaped upper extension (114) that is arranged to protect the motor (60) of the mixing pump applicator (50), when mounted in the housing (105). The upper extension (114) of the frame (110) is also used to mount pump speed and feed speed gauges (116) and a water flow gauge (118). A control panel (120) is also provided on the frame (110) for the operator to control the pump speed, feed speed, air pressure, and pneumatic controls. Forklift pockets (122) are provided in the base of the frame (110) to allow the cementitious product applicator (100) to be easily moved with a forklift or other heavy lifting machine.
[0037] The hopper hood (130) is depicted in isolation in Figs 6 and 7 and comprises a steel top plate (132) sized and arranged to cover the hopper (52). A circular rim projection (134) projects from the top plate (132) and encloses a segment shaped feed aperture (136), that passes through the top plate (132). The circular rim projection (134) extends laterally beyond the edge (138) of the top plate (132) and a segment shaped base plate (140) extends from the edge (138) of the top plate (132) to enclose the bottom of the rim projection (134). Two grill bars (142) extend across the feed aperture (136) parallel to the edge (138) of the top plate (132). A circular view port (144) is also provided through the top plate (132).
[0038] A cylindrical feed control device (150) is depicted in Figs 8 to 10 and has a bottom end (152) sized and shaped to fit within and be mounted on the rim projection (134). A pivot shaft (156) extends transversely through the feed control device (150) perpendicular to the vertical axis of the feed control device (150) and is mounted to pivot about its longitudinal axis. A semi-circular valve plate (158) is fixed to the pivot shaft (156) and as the pivot shaft (156) turns, the valve plate (158) pivots through 90 from a horizontal closed position, as depicted in Figs 9 and 10, to a vertical open position, as indicated by the arrow in Fig. 10.
[0039] A fixed funnel plate (160) has a top portion that extends downwardly and inwardly from a top end (154) of the feed control device (150) to the pivot shaft (156) and a bottom portion that extends vertically downward from the pivot shaft (156) and projects vertically from the bottom end (152) of the of the feed control device (150). The vertical bottom portion of the funnel plate (160) creates a throat (162) between the funnel plate (160) and the wall of the feed control device (150). This throat (162) can be selectively opened or closed by pivoting the valve plate (158) between the vertical and horizontal positions.
[0040] The pivot shaft (156) is actuated by a pair of cranks (164) pivotally connected to a crank nut (166) that travels on a threaded shaft (168). An opposing pair of pins (170) on the cranks (164) project into complementary cavities in the crank nut (166) allowing the crank nut (166) to pivot relative to the cranks (164). The threaded shaft (168) is mounted to the feed control device (150) via a ball joint mounted sleeve (172) in a bearing bracket (174) that is welded to the side of the feed control device (150). The threaded shaft (168) is constrained axially by a bolt head (176) and a first stop nut (178) on either side of the sleeve (172) but able to pivot relative to the bearing bracket (174) via the ball joint. A second stop nut (180) is located on the threaded shaft (168) to limit axial movement of the crank nut (166).
[0041] In order to open and close the valve plate (158), the threaded shaft (168) is rotated by the bolt head (176). This causes the crank nut (166) to translate along the threaded shaft (168) as it is rotationally constrained by the cranks (164). As the crank nut (166) translates on the threaded shaft (168), the cranks (164) turn the pivot shaft (156), driving the pivoting of the valve plate (158).
[0042] The feed control device (150) is mounted on the hopper hood (130) with the bottom end (152) located in the rim projection (134) and the bottom portion of the funnel plate (160) abutting against the flat edge of the feed aperture (136). Once located in the rim projection (134), the feed control device (150) is clamped in place, as shown in Figs 3 to 5. The top end (154) of the feed control device (150) is adapted to be connected to a bulk bag of dry cementitious material.
[0043] Figs 10 to 12 depict the dust scrubber box (190), shown in Fig. 5, in isolation. The scrubber box (190) comprises a main chamber (192) within the scrubber box (190), an inlet pipe (194) and an outlet pipe (196). The main chamber (192) is partially filled with water and dust laden air from the hopper (52) is drawn into the main chamber (192) via the inlet pipe (194). Passing the air through the water in the main chamber (192) removes dust from the air, leaving it in the water, and the clean air is able to exit the main chamber (192) via the outlet pipe (194) and be returned to the hopper (52) or expelled.
[0044] During manufacture of the cementitious product applicator (100), a suitable mixing pump applicator (50) is either acquired and modified for pneumatic or hydraulic operation or custom made. The mixing pump applicator (50) is then installed into the housing (105) to produce the cementitious product applicator (100) described above.
[0045] During operation of the cementitious product applicator (100), a bulk feed bag of dry cementitious material, such as a dry mortar, is suspended above and supported by the bulk bag stand frame (112). The bulk feed bag is then connected to the feed control device (150) so that dry cementitious material can flow into the feed control device (150). The feed control device (150) is operated to at least partially open the valve plate (158), allowing dry cementitious material to flow through the throat (162) and into the hopper (52). Dust generated in the hopper (52) by the dry cementitious material is contained within the closed hopper (52) by the hopper hood (130) and pumped from the hopper (52) to the scrubber box (190), where the dust is removed and contained within the scrubber box (190).
[0046] The cementitious product applicator (100) is then ready to apply wet cementitious product via the spray nozzle (58). Dry cementitious material is delivered by a starwheel or other such mechanism from the base of the hopper (52) to the mixing chamber (62) of the mixing device (54). Water is injected into the mixing chamber (62) and is mixed together with the dry cementitious material by the agitator (66) to form a wet cementitious product in the mixing chamber (62). An operator is able to monitor and control the amount of water and dry cementitious material delivered to the mixing chamber (62), as well as the speed of the mixing, via the motor (60), from the control panel (120) and the gauges (116, 118). Wet cementitious product is pumped via the pump (55) from the base of the mixing chamber (62) and delivered to the spray nozzle (58). Pressurised air is injected into the wet cementitious product at the spray nozzle (58) in order to spray the wet cementitious product from the spray nozzle (58) and onto the target surface.
[0047] The cementitious product applicator (100) described above produces a sprayable wet cementitious product that can be applied to a target surface or structure without producing a significant amount of dust. This makes the cementitious product applicator (100) safe to use in confined or not well ventilated environments. The cementitious product applicator (100) is also able to operate without an electrical supply, as it is designed to run entirely on pneumatic or hydraulic power. This makes the cementitious product applicator (100) safe to use in underground mining operations and volatile gaseous environments where spark ignition is a concern.
[0048] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms.

Claims (4)

The claims defining the invention are as follows:
1. A cementitious product applicator comprising: a hopper adapted to receive a dry cementitious material; a mixing device adapted to receive water and the dry cementitious material from the hopper and mix them to form a wet cementitious product; a spray nozzle adapted to spray the wet cementitious product onto a target surface or structure; and a pump adapted to pump the wet cementitious product from the mixing device to the spray nozzle; a dust scrubber chamber in fluid communication with the hopper and adapted to receive dust laden air from the hopper and clean the air by passing it through water in the dust scrubber chamber; wherein the hopper is fully enclosed by a hopper hood having a feed control device for selectively receiving the dry cementitious material from a dry cementitious material source.
2. The cementitious product applicator of claim 1, wherein the mixing device and pump are powered by a pneumatic or hydraulic motor.
3. The cementitious product applicator of claim 2, wherein compressed air is used to power the mixing device and the pump and compressed air is also supplied to the spray nozzle to project the wet cementitious product from the spray nozzle.
4. The cementitious product applicator of any one of the preceding claims wherein the feed control device comprises a valve mechanism that can be operated between an open and closed position to throttle the flow of dry cementitious material and control the amount of dry cementitious material entering the hopper.
VentSec Pty Ltd By Patent Attorneys for the Applicant
©COTTERS Patent &Trade Mark Attorneys
AU2021106844A 2021-08-20 2021-08-24 Cementitious product applicator Active AU2021106844B4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2021902618A AU2021902618A0 (en) 2021-08-20 Cementitious product applicator
AU2021902618 2021-08-20

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AU2021106844A4 AU2021106844A4 (en) 2021-10-07
AU2021106844B4 true AU2021106844B4 (en) 2022-03-24

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008096A1 (en) * 2000-07-22 2002-01-31 Burrows, Anthony, Gregory Machine and method for spraying material
CN203189037U (en) * 2013-05-03 2013-09-11 辛世行 Environment-friendly concrete wet spraying machine
CN209440529U (en) * 2018-09-20 2019-09-27 山西恒泰伟业建材有限公司 A kind of powder accelerator mixing device
CN211917300U (en) * 2020-01-19 2020-11-13 河南力行科创矿山技术开发有限公司 Automatic slurrying system in pit in colliery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008096A1 (en) * 2000-07-22 2002-01-31 Burrows, Anthony, Gregory Machine and method for spraying material
CN203189037U (en) * 2013-05-03 2013-09-11 辛世行 Environment-friendly concrete wet spraying machine
CN209440529U (en) * 2018-09-20 2019-09-27 山西恒泰伟业建材有限公司 A kind of powder accelerator mixing device
CN211917300U (en) * 2020-01-19 2020-11-13 河南力行科创矿山技术开发有限公司 Automatic slurrying system in pit in colliery

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