GB2321528A - Apparatus for weighing sieves - Google Patents

Apparatus for weighing sieves Download PDF

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Publication number
GB2321528A
GB2321528A GB9627097A GB9627097A GB2321528A GB 2321528 A GB2321528 A GB 2321528A GB 9627097 A GB9627097 A GB 9627097A GB 9627097 A GB9627097 A GB 9627097A GB 2321528 A GB2321528 A GB 2321528A
Authority
GB
United Kingdom
Prior art keywords
sieves
weighing
weight
sample
sieve
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.)
Withdrawn
Application number
GB9627097A
Other versions
GB9627097D0 (en
Inventor
David George Anthony
John Paul Anthony
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9627097A priority Critical patent/GB2321528A/en
Publication of GB9627097D0 publication Critical patent/GB9627097D0/en
Publication of GB2321528A publication Critical patent/GB2321528A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/18—Control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
    • G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
    • G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
    • G01G19/415—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only combined with recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/62—Over or under weighing apparatus

Abstract

Apparatus for weighing the contents of a plurality of sieves comprising: weighing means 3, such as a captive balance or strain gauge; means to record a first weight of each sieve when empty; means to record a second weight of each sieve after a sample of particulate material has been passed through the sieves; means to compare the first and second weights of each sieve; and means to display the result of each comparison. The recording of the first and second weights and the comparisons therebetween are preferable carried out by a CPU 9 and the results then displayed on a liquid crystal display 5. The apparatus may further include a printer 6 to print the results and a bar code reader 10 to automatically read bar codes provided on each sieve in order to facilitate the weight logging process. A method of determining the particle size distribution of a sample of particulate material is also provided.

Description

The present invention relates to an apparatus for weighing sieves.
It common practice to pass a sample of particulate material through a series of different grades of sieves in order to ascertain the ratio of particle sizes making up the sample. For example a sample of particulate material may be passed through a stack of eight sieves of different grades. A technician is required first to weight each sieve separately whilst empty. Then to weigh each sieve after the particulate material has been passed through the sieves. The technician calculates the ratio of particle sizes of the sample by calculating the weight of material in each sieve as a percentage of the original sample. Errors can occur if the sieves are muddled up during the weighing process and mathematical errors can occur as a result of human error. Also the process is time consuming and requires a degree of skill.
The invention seeks to provide an apparatus which makes the above process quicker and less prone to error.
According to the present invention there is provided an apparatus for weighing sieves comprising: a) weighing means to weigh sieves, b) means to record a first weight of each of at least two sieves, c) means to record a second weight of each of said at least two sieves d) means to compare the first and second weights recorded, and e) display means to display the comparison of the first and second weights recorded.
In one embodiment of the invention, the display means includes a LCD display. The LCD display may be a graphics display. The display means may further comprise a printer to provide a printed readout.
The weighing means may comprise a capacitive balance or strain gauge. The weighing means may be accurate to .01 of a gram.
The apparatus may further include means to record a weight of a sample particulate material and to display the comparison of the first and second weights recorded as a percentage of the weight of the sample.
A keyboard may be provided to control the apparatus.
In a further embodiment of the invention, identification means may be provided to identify different sieves. The identification means may be a bar code reader on the apparatus to read a bar code on each sieve. The bar code reader may be mounted adjacent the weighing means so that each sieve is identified whilst it is being weighed.
The invention will now be described with reference to the accompanying drawings in which: Figure 1 shows a perspective view of an apparatus, and Figure 2 shows a schematic circuit diagram.
Referring to Figures 1 and 2 there is shown an apparatus 1 for weighing sieves having a housing 2. Mounted on one side of the housing is a weighing means in the form of a capacitive weighing scale 3 having a weighing plate 3a on which sieves can be placed. The scale 3 may be accurate to .01 of a gram. On the other side of the housing to the scale 3, is a container 4 with a LCD graphics display 5, a paper printer 6, and a keypad 7.
Inside the housing 1 is a power supply unit 8 with on/off switch 8a, and inside the container 4 is a central processing unit 9 (CPU). The power supply 8 supplies power to the scale 3, keyboard, display, printer and CPU 9.
The CPU has means to record a first weight of up to ten sets of eight sieves. It also has means to record a second weight of the up to ten sets of eight sieves. The CPU also has a comparitor to compare the first and second weight recorded, and the output of the comparitor is connected to tzhe display and printer where information is displayed or printed. The CPU is controlled by the keyboard 7. The CPU also includes means to record the weight of a sample of material material and to display the comparison of the first and second weights recorded as a percentage of the weight of the sample.
The invention may be used as follows. Let us suppose a sample of particulate material is to analysed in terms of particle size by passing the material through eight different grades of sieves numbered 1 to 8. First the sample of material is weighed and its weight recorded in the CPU by operation of the appropriate keys on the keyboard. The CPU is then told through the keyboard that there are eight sieves 1 to 8 (the sieve sizes may be entered), and these are weighed consecutively as a first weighing when empty. The CPU records the weight of each.
The sieves are then stacked and the particulate sample passed through the sieves by vibrating them. The sample is thus graded into different sizes. Sieves 1 to 8 are then placed on the scales 3 again in the same order and weighed consecutively as a second weighing. The CPU again records the weight of each. The CPU then compares the difference between the first and second weighings of each sieve and calculates the amount of particulate material in each sieve as a percentage of the original sample. This information is displayed on the display 5 and/or printed out on the printer 6.
The CPU may also process to the display and printer other information such as date of weighing and batch numbers. Also the empty weight of up to 10 sets of eight sieves may be held in the memory of the CPU so that a second weighing is all that is required.
If desired a bar code reader 10 adjacent the scale 3 could be provided, connected to the CPU.
The bar code reader 10 could read a bar code on a sieve. Each of the ten sets of eight sieves could be bar coded so that the CPU would identify or recognise the sieve the apparatus is weighing at any one time. This would help prevent the same sieve from being weighed twice for example due to human error.
If desired information from the CPU could be down-loaded into a computer through an RS232 port 11.
Instead of the scale 3 being a capacitive balance, it could include a strain gauge or other measuring device.
Further modifications will be apparent to those skilled in the art without departing from the scope of the present invention.

Claims (13)

1. Apparatus for weighing the contents of sieves, comprising weighing means, means for recording a first weight of a plurality of sieves, means for recording a second weight of each of said plurality of sieves, means for comparing the first and second weights recorded, and display means for displaying the comparison of the first and second weights recorded.
2. Apparatus as claimed in claim 1, in which the display means includes an LCD display.
3. Apparatus as claimed in claim 2, in which the LCD display is a graphics display.
4. Apparatus as claimed in any preceding claim, in which the display means includes a printer to provide a printed readout.
5. Apparatus as claimed in any preceding claim, in which the weighing means comprises a capacitive balance or a strain gauge.
6. Apparatus as claimed in any preceding claim, further including means for recording the weight of a sample of particulate material and displaying the comparison of the first and second weights recorded as a percentage of the weight of the sample.
7. Apparatus as claimed in any preceding claim, in which identification means are provided for identifying different sieves.
8. Apparatus as claimed in claim 7, in which the identification means is a bar code reader for reading a bar code on each sieve.
9. Apparatus as claimed in claim 8, in which the bar code reader is mounted adjacent the weighing means so that each sieve is identified whilst it is being weighed.
10. Apparatus for weighing sieves substantially as hereinbefore described with reference to, and as shown in the accompanying drawings.
11. A method of determining the weights of different portions of a sample of particulate material, the method comprising weighing a plurality of sieves, weighing the sample of particulate material, passing the sample through the sieves in order, weighing the sieves again, and comparing the first and second weights of each sieve to determine the weight of material in each sieve.
12. A method as claimed in claim 11, including calculating the weight of material in each sieve as a percentage of the the weight of the sample.
13. A method of determining the weights of different portions of a sample of particulate material substantially as hereinbefore described with reference to the accompanying drawings.
GB9627097A 1996-12-31 1996-12-31 Apparatus for weighing sieves Withdrawn GB2321528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9627097A GB2321528A (en) 1996-12-31 1996-12-31 Apparatus for weighing sieves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9627097A GB2321528A (en) 1996-12-31 1996-12-31 Apparatus for weighing sieves

Publications (2)

Publication Number Publication Date
GB9627097D0 GB9627097D0 (en) 1997-02-19
GB2321528A true GB2321528A (en) 1998-07-29

Family

ID=10805131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9627097A Withdrawn GB2321528A (en) 1996-12-31 1996-12-31 Apparatus for weighing sieves

Country Status (1)

Country Link
GB (1) GB2321528A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052030A2 (en) * 1999-05-08 2000-11-15 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Air jet sieve for grain size analysis and corresponding screen element

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789202A (en) * 1971-12-28 1974-01-29 Yamatos Scale Co Ltd Counting balance
DE3005418A1 (en) * 1980-02-14 1981-08-20 Klöckner-Humboldt-Deutz AG, 5000 Köln Automatic granule mixture distribution measurement - is by successive sieving and weighing using balance connected to computer with display
US4423792A (en) * 1981-06-17 1984-01-03 Cowan Donald F Electronic scale apparatus and method of controlling weight
US5059310A (en) * 1989-08-31 1991-10-22 Rhewum Gmbh Analytical sieve apparatus
US5222605A (en) * 1992-01-08 1993-06-29 Rotex, Inc. Automatic particle size analyzer using stacked sieves
US5233520A (en) * 1990-12-19 1993-08-03 The United States Of America As Represented By The Secretary Of Agriculture Method and system for measurement of intake of foods, nutrients and other food components in the diet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789202A (en) * 1971-12-28 1974-01-29 Yamatos Scale Co Ltd Counting balance
DE3005418A1 (en) * 1980-02-14 1981-08-20 Klöckner-Humboldt-Deutz AG, 5000 Köln Automatic granule mixture distribution measurement - is by successive sieving and weighing using balance connected to computer with display
US4423792A (en) * 1981-06-17 1984-01-03 Cowan Donald F Electronic scale apparatus and method of controlling weight
US5059310A (en) * 1989-08-31 1991-10-22 Rhewum Gmbh Analytical sieve apparatus
US5233520A (en) * 1990-12-19 1993-08-03 The United States Of America As Represented By The Secretary Of Agriculture Method and system for measurement of intake of foods, nutrients and other food components in the diet
US5222605A (en) * 1992-01-08 1993-06-29 Rotex, Inc. Automatic particle size analyzer using stacked sieves

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052030A2 (en) * 1999-05-08 2000-11-15 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Air jet sieve for grain size analysis and corresponding screen element
EP1052030A3 (en) * 1999-05-08 2001-12-19 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Air jet sieve for grain size analysis and corresponding screen element

Also Published As

Publication number Publication date
GB9627097D0 (en) 1997-02-19

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