AU2003200426A1 - Improvements in concrete mixers - Google Patents
Improvements in concrete mixers Download PDFInfo
- Publication number
- AU2003200426A1 AU2003200426A1 AU2003200426A AU2003200426A AU2003200426A1 AU 2003200426 A1 AU2003200426 A1 AU 2003200426A1 AU 2003200426 A AU2003200426 A AU 2003200426A AU 2003200426 A AU2003200426 A AU 2003200426A AU 2003200426 A1 AU2003200426 A1 AU 2003200426A1
- Authority
- AU
- Australia
- Prior art keywords
- bowl
- mixer bowl
- mixer
- end wall
- frusto
- 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.)
- Abandoned
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Description
P/001011 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE
SPECIFICATION
STANDARD
PATENT
Invention Title: "IMPROVEMENTS IN CONCRETE MIXERS" The following statement is a full description of this invention, including the best method of performing it known to us: 2 THIS INVENTION relates to concrete mixers.
The invention specifically relates, but is not limited to, improvements in concrete mixer bowls of the type used on truck-mounted concrete mixers.
Conventional concrete mixer bowls are supported at the forward (closed, convex wall) end by the drive means mounted on a pedestal, and at the rearward (discharge) end by a trunnion ring supported by one or more trunnion rollers on an A-frame. The mixing spirals provided within the bowl do not extend into the space defined by the convex end wall.
Experience has found, particularly when the mixer bowls are nearly full, that a "plug" of partially-mixed concrete can form in the space defined by the convex end wall, which is of inferior quality to the remainder of the concrete within the bowl. Furthermore, when the rotation of the bowl is reversed, to discharge the concrete, this "plug" may remain within the bowl and may be difficult to discharge.
The rotational axes of the bowls are typically inclined at 150 to the horizontal. The trunnion ring has an outer (peripheral) face substantially parallel to the rotational axis, and the trunnion roller(s) have outer (peripheral) face(s) also substantially parallel to the rotational axis. The engagement between the trunnion roller(s) generates a force with both horizontal and vertical components. The horizontal component seeks to deflect the A-frame rearwardly, ie., away from the bowl, at its apex. This applies undesirable loadings on the A-frame and the main mixer frame (and, thereby, the prime mover chassis or frame).
3 It is an object of the present invention to provide a concrete mixer bowl where the "plug" of unmixed concrete is eliminated (or at least partially reduced).
It is a preferred object of the present invention to provide a bowl where all of the concrete is mixed uniformly.
It is a further preferred object of the present invention to provide a bowl which may have an increased cubic capacity for the same external dimensions as for conventional bowls.
It is a still further preferred object of the present invention to provide a concrete mixer where the horizontal component of the force (discussed above) is eliminated, or at least minimised.
It is a still further preferred object to adhere such a result with minimal change to existing concrete mixers and at minimal expense.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect, the present invention resides in a concrete mixer bowl of the type having a hollow body, substantially cylindrical in end view, having an open mouth at one end and closed by an end wall at the other end, wherein the end wall is concave, or substantially planar.
Preferably, the bowl body has a cylindrical portion connected to the open mouth by a first frusto-conical portion and is connected to the concave or planar end wall by a second frusto-conical portion.
Preferably, the first frusto-conical portion has external track(s) supported by rollers or wheels on an A-frame; and driving means on the
I
concave or planar end wall operably connect the bowl to a drive motor mounted on a pedestal.
Preferably, the mixing spirals within the mixing body extend from adjacent the concave or planar end wall to adjacent the open mouth.
Preferably, for a given overall length L and diameter D of the mixer bowl, the length in of the cylindrical portion is equal to, or greater than, the length I of the cylindrical portion of a conventional mixer bowl, so thatthe overall volume of the mixer bowl is equal to, or greater than, the volume of a conventional mixer bowl.
In a second aspect, the present invention resides in a concrete mixer of the type having a mixer bowl rotatable about an axis of rotation inclined to the horizontal, wherein the rearward end of the bowl, at or adjacent an open mouth, is supported by at least one trunnion roller, on an A-frame or like support, engageable with a trunnion ring about the bowl, wherein: the peripheral face of the trunnion ring is inclined to the axis of rotation of the bowl at an angle substantially equal to the angle of inclination of the axis of rotation to the horizontal; and the or each trunnion roller has a peripheral face engageable with the peripheral face of the trunnion ring along a substantially horizontal line of contact.
The trunnion roller(s) may be cylindrical, rotatable about a horizontal axis of rotation; or may be frusto-conically tapered, and rotate about an axis of rotation, eg., inclined to the horizontal at an angle one-half the angle of inclination of the axis of rotation of the mixer bowl to the horizontal.
The mixer bowl may be closed at its forward end by a convex, concave, or substantially planar, end wall, supported by the driving means on the pedestal.
Preferably, the bowl body has a cylindrical portion connected to the open mouth by a first frusto-conical portion and is connected to the end wall by a second frusto-conical portion.
Preferably, the first frusto-conical portion has the trunnion ring supported by the trunnion rollers on the A-frame; and driving means on the end wall operably connect the bowl to a drive motor mounted on a pedestal.
To enable the invention to be fully understood, preferred embodiments will now be described with reference to the accompanying drawings, wherein: FIG. 1 is a schematic side view of a conventional concrete mixer; FIG. 2 is a similar view of a concrete mixer provided with a mixer bowl of the present invention, having a concave end wall; FIG. 3 is a schematic side view a first embodiment of the mixer bowl of the present invention; FIG. 4 is a similar view of a second embodiment; FIG. 5 is a sectional view of the trunnion ring on an enlarged scale; and FIG. 6 is a part-sectional view of the forward end of the mixer bowl of the present invention.
6 Referring to FIG. 1, a conventional concrete mixer mountable on a truck (not shown) has a frame 11 supporting a mixer bowl The mixer bowl 20 has an open mouth 21 to receive the ingredients for the concrete mixer via an inlet hopper 22 and is operable to discharge the mixed concrete via a discharge outlet 23 operable to connect with a discharge chute 24.
A first frusto-conical portion 25 of the mixer bowl 20 has a trunnion ring 26 supported by trunnion rollers 12 on an A-frame 13 on the main frame 11. A cylindrical portion 27 of the mixer bowl 20, of length I1 interconnects the first frusto-conical portion 25 to a second frusto-conical portion 28 which is closed by a convex end wall 29. The convex end wall 29 is provided with drive means 30 which operably connects the mixer bowl to a drive motor 31 and transmission 32 mounted on a pedestal 14 on the main frame 11.
As hereinbefore described, the mixing spirals 40 within the mixer drum 20 do not extend into the space defined by the convex end wall 29, as indicated by the shaded areas, and so a plug of partially mixed concrete can reside in that space and not be fully discharged when the rotational of the mixer drum 20 is reversed to enable discharge of the concrete at a site.
Referring to FIGS. 2, 3 and 6, the mixer drum 120 (where all reference numerals are increased by 100 compared with the known mixer drum of FIG. 1) has a concave end wall 129 which extends into the space defined by the second frusto-conical portion 128 of the mixerdrum 120 see, in particular, FIG. 6.
The mixing spirals 140 extend from adjacent the concave end wall 129 to a location adjacent the open mouth 121 to ensure complete discharge of the concrete from the space adjacent the concave end wall.
The concave end wall 129, which is convex when viewed from the interior of the drum 120, causes the concrete on the wall to fall into the drum 120 and be engaged by the mixing spirals 140. (As indicated by the solid lines, the spirals 140 may extend to, or closely adjacent, the end wall 129.) In addition to the more complete mixing and efficient discharge of the concrete, the concave end wall 129 enables the length In of the cylindrical portion 172 to be increased over the corresponding length I1 of the cylindrical portion 27 of the conventional mixer bowl 120 for the same overall length L of the complete mixer bowl (assuming the same lengths for the first and second frusto-conical portions 25, 125, and 28, 128). This means for the same overall diameter D of the two mixer bowls, the capacity of the mixer bowl 120 of the present invention will be equal to or greater than the capacity of the conventional mixer bowl 20 as any loss in volume due to the concave end wall 129 compared to the convex end wall 29 will be overcome, or exceeded by, the increase in volume of the cylindrical portion 127 of the mixer bowl of the present invention compared with the volume of the cylindrical portion 27 of the conventional mixer bowl This means that a concrete mixer operator does not lose any capacity and, indeed, may have a greater capacity bowl mountable within given external dimensions on his truck.
In an alternative embodiment not illustrated, the end wall 129 may be substantially planar.
Referring to FIGS. 2 and 3, the trunnion ring 126 has a peripheral face 126a which is inclined to the axis of rotation A of the mixer bowl 120 at an angle a equal to the inclination angle a of the axis of rotation A to the horizontal.
The trunnion rollers 112 are substantially frusto-conical and have peripheral faces 112a inclined to their axis of rotation at an angle a/2, which is equal to the angle of inclination of their axis to the rotational axis A.
This ensures that the trunnion rollers 112 engage the trunnion ring 126 along a horizontal line of contact, to only generate a vertical supporting force, ie, there is no horizontal force component.
In an alternative embodiment not shown, the trunnion rollers 112 may be cylindrical and rotate about horizontal axes of rotation.
As there is no horizontal force component between the trunnion ring 126 (and bowl 120) and the trunnion rollers 112 (and A-frame 113), there is no horizontal deflection force on the A-frame 113 on the mixer frame 111.
In the second embodiment in FIGS. 4 and 5, the trunnion ring 226 about the mixer bowl 220 is formed from cylindrical metal stock (eg.
round bar) and is machined with two inclined faces, where the peripheral face 226a is inclined to the axis of rotation of the mixer bowl 220, and is engaged by the trunnion rollers (not shown), while the second face 226b engages the outer face of the mixer bowl to be welded (or otherwise fixed 9 thereto).
Various changes and modifications may be made to the embodiments described and illustrated without departing from the present invention.
Claims (14)
1. A concrete mixer bowl of the type having a hollow body, substantially cylindrical in end view, having an open mouth at one end and closed by an end wall at the other end, wherein the end wall is concave, or substantially planar.
2. A mixer bowl as claimed in Claim 1, wherein: the bowl body has a cylindrical portion connected to the open mouth by a first frusto-conical portion and is connected to the concave or planar end wall by a second frusto-conical portion.
3. A mixer bowl as claimed in Claim 2 wherein: the first frusto-conical portion has external track(s) supported by rollers or wheels on an A-frame; and driving means on the concave or planar end wall operably connect the bowl to a drive motor mounted on a pedestal.
4. A mixer bowl as claimed in any one of Claims 1 to 3 wherein: the mixing spirals within the mixing body extend from adjacent the concave or planar end wall to adjacent the open mouth.
A mixer bowl as claimed in any one of Claims 1 to 4 wherein: for a given overall length L and diameter D of the mixer bowl, the length In of the cylindrical portion is equal to, or greater than, the length Ic of the cylindrical portion of a conventional mixer bowl, so that the overall volume of the mixer bowl is equal to, or greater than, the volume of a conventional mixer bowl.
6. A concrete mixer of the type having a mixer bowl rotatable 11 about an axis of rotation inclined to the horizontal, wherein the rearward end of the bowl, at or adjacent an open mouth, is supported by at least one trunnion roller, on an A-frame or like support, engageable with a trunnion ring about the bowl, wherein: the peripheral face of the trunnion ring is inclined to the axis of rotation of the bowl at an angle substantially equal to the angle of inclination of the axis of rotation to the horizontal; and the or each trunnion roller has a peripheral face engageable with the peripheral face of the trunnion ring along a substantially horizontal line of contact.
7. A mixer bowl as claimed in Claim 6 wherein: the trunnion roller(s) are cylindrical, rotatable about a horizontal axis of rotation or are frusto-conically tapered, and rotate about an axis of rotation, inclined to the horizontal at an angle one-half (112) the angle of inclination of the axis of rotation of the mixer bowl to the horizontal.
8. A mixer bowl is closed at its forward end by a convex, concave or substantially planar end wall, supported by the driving means on the pedestal.
9. A mixer bowl as claimed in Claim 7 wherein: the bowl body as a cylindrical portion connected to the open mouth by a first frusto-conical portion and is connected to the end wall by a second frusto-conical portion.
A mixer bowl as claimed in Claim 9 wherein: the first frusto-conical portion has the trunnion ring supported by the trunnion rollers on the A-frame; and driving means on the end wall operably connect the bowl to a drive motor mounted on a pedestal.
11. A concrete mixer bowl, as claimed in Claim 1, substantially as hereinbefore described with reference to FIGS. 2 to 6 of the accompanying drawings.
12. A concrete mixer bowl, as claimed in Claim 6, substantially as hereinbefore described with reference to FIGS. 2 and 3; or FIGS. 4 and 5, of the accompanying drawings.
13. A concrete mixer bowl substantially as hereinbefore described with reference to FIGS. 2, 3 and 6; or FIGS. 2 and 4 to 6, of the accompanying drawings.
14. A concrete mixer provided with the mixer bowl as claimed in any one of Claims 1 to 13. DATED this seventh day of February 2003. MIXERS AUSTRALIA PTY LTD By its Patent Attorneys FISHER ADAMS KELLY
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003200426A AU2003200426A1 (en) | 2002-02-11 | 2003-02-07 | Improvements in concrete mixers |
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPS0416 | 2002-02-11 | ||
| AUPS0416A AUPS041602A0 (en) | 2002-02-11 | 2002-02-11 | Improvements in concrete mixers |
| AU2002951041A AU2002951041A0 (en) | 2002-08-28 | 2002-08-28 | Improvements in concrete mixers |
| AU2002951041 | 2002-08-28 | ||
| AU2002952424 | 2002-11-04 | ||
| AU2002952424A AU2002952424A0 (en) | 2002-11-04 | 2002-11-04 | Improvements in concrete mixers |
| AU2003200426A AU2003200426A1 (en) | 2002-02-11 | 2003-02-07 | Improvements in concrete mixers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2003200426A1 true AU2003200426A1 (en) | 2003-08-28 |
Family
ID=34069142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2003200426A Abandoned AU2003200426A1 (en) | 2002-02-11 | 2003-02-07 | Improvements in concrete mixers |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2003200426A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105583953A (en) * | 2014-07-15 | 2016-05-18 | 翁兴星 | Concrete truck mixer |
| CN108000721A (en) * | 2017-12-07 | 2018-05-08 | 中交二公局第三工程有限公司 | Liftable formula concrete tank and its hanging method for heavy grade incline shaft transport |
| CN113897941A (en) * | 2021-09-14 | 2022-01-07 | 陈振 | Mixed lime-soil backfilling and tamping equipment |
-
2003
- 2003-02-07 AU AU2003200426A patent/AU2003200426A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105583953A (en) * | 2014-07-15 | 2016-05-18 | 翁兴星 | Concrete truck mixer |
| CN108000721A (en) * | 2017-12-07 | 2018-05-08 | 中交二公局第三工程有限公司 | Liftable formula concrete tank and its hanging method for heavy grade incline shaft transport |
| CN113897941A (en) * | 2021-09-14 | 2022-01-07 | 陈振 | Mixed lime-soil backfilling and tamping equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |