AU2004210562A1 - Measurement of mass flow rate by a conveyor - Google Patents

Measurement of mass flow rate by a conveyor Download PDF

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Publication number
AU2004210562A1
AU2004210562A1 AU2004210562A AU2004210562A AU2004210562A1 AU 2004210562 A1 AU2004210562 A1 AU 2004210562A1 AU 2004210562 A AU2004210562 A AU 2004210562A AU 2004210562 A AU2004210562 A AU 2004210562A AU 2004210562 A1 AU2004210562 A1 AU 2004210562A1
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AU
Australia
Prior art keywords
conveyor
belt
measurement
flow rate
invention
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
Application number
AU2004210562A
Inventor
William Glen Herbert
Brian Malcolm Lewis
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.)
FLOW FORCE TECHNOLOGIES Pty Ltd
W G & H M Herbert Nominees Pty Ltd
Original Assignee
FLOW FORCE TECHNOLOGIES Pty LT
FLOW FORCE TECHNOLOGIES Pty Ltd
W G & H M Herbert Nominees Pty
W G & H M Herbert Nominees 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 to AU2003905026 priority Critical
Priority to AU2003905026A priority patent/AU2003905026A0/en
Application filed by FLOW FORCE TECHNOLOGIES Pty LT, FLOW FORCE TECHNOLOGIES Pty Ltd, W G & H M Herbert Nominees Pty, W G & H M Herbert Nominees Pty Ltd filed Critical FLOW FORCE TECHNOLOGIES Pty LT
Priority to AU2004210562A priority patent/AU2004210562A1/en
Publication of AU2004210562A1 publication Critical patent/AU2004210562A1/en
Application status is Abandoned legal-status Critical

Links

Description

54877 GEH:PFB P/00/011 Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

Name of Applicants: FLOW FORCE TECHNOLOGIES PTY LTD and W G H M HERBERT NOMINEES PTY LTD Name of inventors: BRIAN MALCOLM LEWIS WILLIAM GLEN HERBERT Address for Service: COLLISON CO.,117 King William Street, Adelaide, S.A. 5000 Invention Title: MEASUREMENT OF MASS FLOW RATE BY A CONVEYOR Details of Associated Provisional Application: Australian Patent Application No. 2003905026 Dated 15 th September 2003 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 a solids flow meter which is suitable for dry fluent materials such as granular solids and powders as it is passing through a belt in tube conveyor or belt conveyor.

At the present time, the most commonly used means of measuring mass flow rate from a belt conveyor is an impact flow meter located in the discharge chute of the conveyor.

However the performance of an impact flow meter is a function of the material particle characteristics; the latter determining the energy loss on rebound of the material from the impact plate(s). Every material has an inherent "rebound coefficient" that is influenced by such characteristics as particle size, shape, hardness and moisture content. Thus a problem which is encountered is the need to calibrate the impact flow meter for each of the materials with which it is to be used.

Such calibration procedures impose additional costs on the measurement process from the need to install special diversion valves, chutes, collecting bins, transport to a weigh scale or road weighbridge and return of the material into the processing plant or sometimes to waste.

It is an object of the invention to overcome one or more of the above problems and to provide mass flow rate measurement of material carried by a belt conveyor.

It is a further object of the invention to provide a mass flow rate measurement of the material whilst on the conveyor belt.

Thus according to the invention the measurement of mass flow rate is based on a gravimetric measurement of weight per unit length of the conveyor and so requires only a single calibration for all materials for which it is to be used.

There is provided according to the invention a belt conveyor, belt support means provided along the length of the conveyor, a portion of the belt support means supported independently of the remainder of the conveyor, means for measuring the load exerted by material passing over the independent section and used as a basis for calculating mass flow rate and therefore the weight of a batch or batches of the material.

Preferably the conveyor is a belt in tube conveyor, the belt sliding along the inside of the tube, a portion of the tube being independent of the remainder of the tube and hinged to an adjacent end of the remainder of the tube, and load measuring means supporting the opposite end of the independent portion of the tube.

In an alternate form of the invention the conveyor may be a belt conveyor supported on rollers, a number of the rollers being independently supported on a frame, one end of the frame hinged to the supporting structure of the belt conveyor and load measuring means supporting the opposite end of the frame.

Preferably the independent portion of the conveyor is at the discharge end of the conveyor.

In order to more fully describe the invention reference will now be made to the accompanying drawings in which:- Figure 1 is a diagrammatic side elevation of one form of the invention, and Figure 2 is a diagrammatic side elevation of an alternate form of the invention.

Figure 1 shows diagrammatically the manner in which a section of a belt in tube conveyor is independently supported and means by which the load on the independent section of the belt in tube conveyor is measured.

In this embodiment, the independent section of the belt in tube conveyor comprises the end section of the tube 10 of length L which is carried on one side of a swivel bearing support 11, the support 11 being itself supported on the fixed belt in tube conveyor 12 via a flange 13. The top of the flange is connected to one end of a load cell 14, the other end of the load cell being connected via a rigid system of rods 15 to a flange 16 mounted at the discharge end of the independent section of the belt in tube conveyor.

Thus the measurement of force vector F1 can be used to determine the mass flow rate of the material from the following expressions: Weight per unit length F1 x Calibration constant.

Mass flow rate (Weight per unit time) Weight per unit length x material velocity The material velocity can be determined by direct measurement of the belt speed using conventional means.

Thus the material passing through the tube section 10 and discharging at E is weighed and thus the total weight of material passing through the belt in tube conveyor is weighed.

Initial trials of the invention have yielded results having a measurement accuracy better thanl of true weight with the potential of achieving better than 0.5% of true weight.

The weight measurements are automatically compensated for variations in the angle of inclination of the conveyor by means of an electronic inclinometer, and the location of the swivel bearings 11 is selected so as to minimise the effect of variations in belt tension with variations in load.

An alternate embodiment of this invention is shown in FIG. 2 in which the bottom of the flange 13 is connected to one end of a load cell 14, the other end of the load cell 14 being connected via a rigid system of rods 15 to a flange 16 mounted underneath the discharge end of the independent section of the belt in tube conveyor.

The invention is not limited to a belt in tube conveyor but can be applied to other forms of conveyors such as a belt conveyor supported on rollers. Thus the discharge end section of the conveyor comprising the end belt roller and at least one adjacent support roller can be mounted on a separate support frame and hinged to the fixed portion of the belt conveyor and supported in a manner similar to either of the above two embodiments.

While ideally the independent portion of the conveyor is the discharge end of the conveyor, it is realised the independent portion could be positioned anywhere along the length of the conveyor.

Thus it is envisaged also that the discharge portion of the conveyor be hinged at an upstream end to the fixed portion of the conveyor, the discharge end of hinged portion supported by force measuring or weighing means.

Thus it can be seen that there is provided according to the invention a method and apparatus for measurement of mass flow rate by a conveyor, the conveyor having a portion of the means supporting the independently supported portion from the remainder of the conveyor, and force measuring means supporting the independent portion.

The invention avoids the necessity of recalibrating the conveyor for differing materials being conveyed, it is only necessary to calibrate the conveyor on installation, the same calibration factor being used at all times. The invention provides an accurate continuous reading and provides a measurement of the total weight of the material being conveyed.

Although various embodiments of the invention have been described it is to be realised the invention is not to be limited thereto but can include variations and modifications falling within the spirit and scope of the invention.

AU2004210562A 2003-09-15 2004-09-13 Measurement of mass flow rate by a conveyor Abandoned AU2004210562A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2003905026 2003-09-15
AU2003905026A AU2003905026A0 (en) 2003-09-15 Measurement of mass flow rate through a belt-in-tube conveyor
AU2004210562A AU2004210562A1 (en) 2003-09-15 2004-09-13 Measurement of mass flow rate by a conveyor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2004210562A AU2004210562A1 (en) 2003-09-15 2004-09-13 Measurement of mass flow rate by a conveyor

Publications (1)

Publication Number Publication Date
AU2004210562A1 true AU2004210562A1 (en) 2005-04-07

Family

ID=34423822

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2004210562A Abandoned AU2004210562A1 (en) 2003-09-15 2004-09-13 Measurement of mass flow rate by a conveyor

Country Status (1)

Country Link
AU (1) AU2004210562A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130275061A1 (en) * 2010-12-15 2013-10-17 Anubis Manufacturing Consultants Corp. System for and method of measuring flow of a powder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130275061A1 (en) * 2010-12-15 2013-10-17 Anubis Manufacturing Consultants Corp. System for and method of measuring flow of a powder
US9766107B2 (en) * 2010-12-15 2017-09-19 Anubis Manufacturing Consultants Corp. System for and method of measuring flow of bulk solid material

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