US2957130A - Sand conditioning equipment - Google Patents

Sand conditioning equipment Download PDF

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Publication number
US2957130A
US2957130A US671295A US67129557A US2957130A US 2957130 A US2957130 A US 2957130A US 671295 A US671295 A US 671295A US 67129557 A US67129557 A US 67129557A US 2957130 A US2957130 A US 2957130A
Authority
US
United States
Prior art keywords
probe
moisture
tube
sand
bushing
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.)
Expired - Lifetime
Application number
US671295A
Other languages
English (en)
Inventor
Harry W Dietert
Randolph L Dietert
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.)
Harry W Dietert Co
Original Assignee
Harry W Dietert Co
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 US613075A external-priority patent/US2863191A/en
Application filed by Harry W Dietert Co filed Critical Harry W Dietert Co
Priority to US671221A priority Critical patent/US3000064A/en
Priority to US671295A priority patent/US2957130A/en
Priority to US67482257 priority patent/US2886868A/en
Priority to CH356290D priority patent/CH356290A/de
Priority to FR1207720D priority patent/FR1207720A/fr
Priority to DED28446A priority patent/DE1168124B/de
Priority claimed from GB2205358A external-priority patent/GB878076A/en
Priority to US838615A priority patent/US3047801A/en
Publication of US2957130A publication Critical patent/US2957130A/en
Application granted granted Critical
Priority to CH1397660A priority patent/CH372483A/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B28C7/0404—Proportioning
    • B28C7/0409—Proportioning taking regard of the moisture content of the solid ingredients; Moisture indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/043—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a granular material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D22/00—Control of humidity
    • G05D22/02—Control of humidity characterised by the use of electric means

Definitions

  • the present invention relates to sand conditioning equipment, and more particularly to apparatus for mixing sand and water including means exposed to the mixture for determining its moisture content.
  • amoisture probe comprising a tube preferably of stainless steel having an end surface exposed within a receptacle, a di-electric bushing within said tube having an. end surface forming a smooth continuation of the end surface of the tube and also exposed to moist material in the container, and an electrical conductor extending through said tube and having a portion, preferably radially enlarged, the end surface of which is coplanar with the end surfaces of said tube and said bushing, said container being formed preferably of stainless steel 20 facilitate removal of compressed moist specimens there- -"-More specifically, it isan object of the present invention to provide a moisture probe as described in the preceding paragraphwhich comprises resilient means acting between the tube and electrical conductor and effective to maintaina tight assembly of said tube, bushing and conductor.
  • Figure 1 is a diagrammatic plan view of a sand container constructed in accordance with the present invention.
  • Figure 2 is a transverse sectional view of the structure shown in Figure 1.
  • Figure 3 is a diagrammatic plan view of a sand container forming a second embodiment of the present invention.
  • Figure 4 is a sectional view on the line 44, Figure 3.
  • a quantity of moist sand indicated at S is in a container 10 which may be a conventional sand mill and which is mixed with water added thereto by the rotation of a pair of relatively heavy rollers 12 having scraping blades 14 and 16 rotatable therewith.
  • a moisture probe 18 Located in the bottom wall of the mill is a moisture probe 18 the details of which may be as described subsequently in conjunction with Figure 5.
  • the moisture content of the sand is continuously determined by the moisture probe, the passage of each roller 12 over the moisture probe compressing a moist specimen and giving a relatively high or maximum reading of moisture content.
  • the blade 14 passes over the moisture probe 18' and removes the moist sample therefrom. While moist sand may fall back against the moisture probe, it will not afford a high reading until passage of the next succeeding roller 12 thereover.
  • the moisture probe is associated in a control system which continues to add water to the sand until a control system including the moisture probe indicates that the percentage of moisture is adequate.
  • FIG. 3 and 4 there is illustrated a second sand mill 20 having a rotary carrier 22 connected to a drive shaft 23 rotatable about a vertical axis and having rollers 24 adjacent its periphery.
  • vanes 26 the lower edges of which are connected to a'plate 28.
  • scrapers 30 At the outer edges of the carrier 22 and in the horizontal plane of the rollers 24 are provided scrapers 30.
  • the mixer also includes plows 32. Water is admitted to the container through a pipe 33 and the admission of Water is controlled by means responsive to the moisture content and also preferably to the temperature of the sand in the container 20.
  • a thermocouple for determining temperature of the sand is indicated at 34 and a moisture probe is indicated at 36.
  • the moisture probe illustrated in Figure 5 is adapted to provide-accurate readings of the moisture content in association with the structure shown in Figures 1-4.
  • the moisture probe comprises a tube 40 preferably formed of stainless steel and fixed in an opening 42 in a plate 44 adapted to be exposed at the inner surface of a wall of the container '10 or 20.
  • a metal ring 46 fixed in position by pins 48.
  • An insulating bushing 50 is provided having an opening 52 through which extends a stainless steel probe element 54 the inner end of which is conically formed as illustrated to engage in a conical seat 56 provided in the bushing.
  • the inner surfaces of the tube 40, the bushing 50, and the probe 54 are all smooth continuations of the exposed surface of the plate 44. If the probe is located in the bottom wall of the mill the exposed surfaces are planar. If the probe is located in a side wall of the mill, the exposed surfaces are preferably cylindrically formed.
  • a second insulating member 58 having a reduced portion 60 carrying a washer 62 preferably formed of metal such for example as brass.
  • a third insulating member 64 having a reduced portion 66 carrying a Washer 68 formed of metal such for example as brass. Extending between the washers 62 and 68 is a compression spring 79. Located within the spring 70 and surround ing the intermediate portion of the probe element 54 is an insulating sleeve 72.
  • the outer end of the probe element 54 is threaded s indicated at 74 and carries a nut 76 bearing against Washer 78 which in turn bears against the outer end of the insulating member 64. Accordingly, the spring 79 urges the probe element 54 outwardly and maintains its head in firm contact in the conically formed seat provided in the bushing 59.
  • the spring is also elfective to maintain the bushing 50 firmly against the annular seat afforded by the member 46.
  • the nut 76 By adjusting the nut 76, the effectiveness of the spring 70 may be adjusted to insure a positive seal between the bushing 50, and probe element 54 at all times despite cold flow of the material of the bushing.
  • the insulating members or bushings 50, 58 and 64 are formed of a suitable inert plastic material such as Teflon.
  • the moisan elongated metal tube having a substantially fiat first end and an annular shoulder therein spaced inwardly from said first end, an annular bushing of plastic material having one end seated on said shoulder having its other end substantially flush with the said first end of said tube, said bushing fitting closely within the first end portion of said tube, said bushing having a central opening extending therethrough in alignment with the axis of said tube, said opening at its other end being of outwardly flaring conical shape, an elongated central electrode having a conical head seated in the conical portion of the opening through said bushing, the end surface of said head being flush with the first end of said tube and the said other end of said bushing, and a shank extending longitudinally of said tube, an annular abutment on said shank adjacent the second end of said tube, a first insulating spring seat located against the side of said shoulder remote from said first end of said tube, a' second insulating spring
  • the moisture probe indicates a substantially greater moisture content for the sand than is actually present.
  • means are provided for insuring that the moisture probe is maintained at a temperature above that of the thermal insulation may be provided, as indicated at 86 to surround the tube 40.
  • Probe structure for the measurement of the moisture content of moist granular material, said probe comprising of said insulating bushing while providing for yielding movement thereof on expansion of said bushing.
  • said probe comprising a metal tube, a center electrode in said metal tube, and an insulating bushing interposed between said tube and center electrode, said tube extending outwardly of said receptacle, and a heater surrounding the exterior portion of said tube in heat transfer relation thereto to maintain the moisture sensitive surface of said probe at a temperature which is not less than the temperature of the moist granular material in said receptacle.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Electrochemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Dispersion Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
US671295A 1956-10-01 1957-07-11 Sand conditioning equipment Expired - Lifetime US2957130A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US671221A US3000064A (en) 1956-10-01 1957-07-11 End point moisture content control for sand
US671295A US2957130A (en) 1956-10-01 1957-07-11 Sand conditioning equipment
US67482257 US2886868A (en) 1956-10-01 1957-07-29 End point moisture content control apparatus for sand
CH356290D CH356290A (de) 1956-10-01 1958-07-02 Einrichtung zum Messen und Regulieren des Feuchtigkeitsgehaltes von körnigem Schüttgut
FR1207720D FR1207720A (fr) 1956-10-01 1958-07-03 Dispositif de mesure et de réglage de la teneur en humidité d'une matière granuleuse en vrac
DED28446A DE1168124B (de) 1956-10-01 1958-07-03 Einrichtung zum Mischen und zum Regulieren des Feuchtigkeitsgehaltes von koernigem Schuettgut
US838615A US3047801A (en) 1956-10-01 1959-09-08 Moisture probe
CH1397660A CH372483A (de) 1956-10-01 1960-12-13 Einrichtung zum Messen und Regulieren des Feuchtigkeitsgehaltes von körnigem Schüttgut

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US613075A US2863191A (en) 1956-10-01 1956-10-01 Sand conditioning equipment
US671295A US2957130A (en) 1956-10-01 1957-07-11 Sand conditioning equipment
GB2205358A GB878076A (en) 1958-07-09 1958-07-09 Improvements in or relating to means for measuring and regulating the moisture content of bulk granular material

Publications (1)

Publication Number Publication Date
US2957130A true US2957130A (en) 1960-10-18

Family

ID=32397664

Family Applications (1)

Application Number Title Priority Date Filing Date
US671295A Expired - Lifetime US2957130A (en) 1956-10-01 1957-07-11 Sand conditioning equipment

Country Status (4)

Country Link
US (1) US2957130A (de)
CH (1) CH356290A (de)
DE (1) DE1168124B (de)
FR (1) FR1207720A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171990A (en) * 1959-07-16 1965-03-02 George Kent Stroud Ltd Electrode assembly for electromagnetic flowmeters
US3188563A (en) * 1960-02-09 1965-06-08 Dietert Co Harry W Porous electrode for air permeable moisture probe
US3197698A (en) * 1959-12-07 1965-07-27 Pure Oil Co Temperature-controlled corrosion test probe
US3467860A (en) * 1966-01-03 1969-09-16 Karl Trischberger Moisture content sensing probe including wiper means for continuous wiping of test material from probe surface
US4812741A (en) * 1987-02-10 1989-03-14 Stowell Dennis E Baler-mounted continuous moisture monitoring system
CN109203246A (zh) * 2018-09-25 2019-01-15 长江水利委员会长江科学院 一种基于细骨料含水率自动测定的混凝土生产过程自动补偿系统及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608152A1 (de) * 1986-03-12 1987-09-24 Meyer Fa Rud Otto Verfahren zur regelung von duesenkammern mit mehreren einzeln abschaltbaren duesenstoecken von luftwaeschern und anlage zur durchfuehrung des verfahrens

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB116478A (en) * 1918-02-23 1918-06-13 William Cunningham Improvements in or relating to Coke Oven Doors.
US2650343A (en) * 1949-11-09 1953-08-25 John E Thompson Device for end point determination in fat rendering process
US2702948A (en) * 1952-02-12 1955-03-01 Du Pont Moisture control
US2755438A (en) * 1953-03-11 1956-07-17 William H Cudmore Moisture tester for grains
US2802178A (en) * 1954-09-22 1957-08-06 Gen Electric Motion detecting device
US2824282A (en) * 1954-02-10 1958-02-18 Milton E Posey Electrode assembly
US2852740A (en) * 1952-12-05 1958-09-16 Milton E Posey Moisture control device for concrete mixers

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB621181A (de) * 1900-01-01
DE664502C (de) * 1938-08-27 Otto Velten Dr Kondensator zur fortlaufenden Messung des Anteiles eines Stoffes an Stoffgemischen
DE724042C (de) * 1937-11-30 1942-08-17 Paul Lippke Einrichtung zur Durchfuehrung von Feuchtigkeitsmessungen an schlecht oder nicht gleitfaehigen Guetern
US2542928A (en) * 1947-04-26 1951-02-20 Patterson Co C Apparatus for testing material
GB647990A (en) * 1948-11-05 1950-12-28 John Leonard Shaw Improvements in or relating to apparatus for use in determining the moisture contentof textile materials
DE1681810U (de) * 1949-08-22 1954-08-19 Heinz Dr Ing Mahlo Vorrichtung zur messung des feuchtigkeitsgehaltes hygroskopischer materialien auf elektrischem wege.
US2608604A (en) * 1951-05-07 1952-08-26 Raymond S Hart Temperature compensated contactor
DE861933C (de) * 1951-08-07 1953-01-08 Brabender O H Vorrichtung zur fortlaufenden Bestimmung des Feuchtigkeitsgehaltes schaufelbaren Gutes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB116478A (en) * 1918-02-23 1918-06-13 William Cunningham Improvements in or relating to Coke Oven Doors.
US2650343A (en) * 1949-11-09 1953-08-25 John E Thompson Device for end point determination in fat rendering process
US2702948A (en) * 1952-02-12 1955-03-01 Du Pont Moisture control
US2852740A (en) * 1952-12-05 1958-09-16 Milton E Posey Moisture control device for concrete mixers
US2755438A (en) * 1953-03-11 1956-07-17 William H Cudmore Moisture tester for grains
US2824282A (en) * 1954-02-10 1958-02-18 Milton E Posey Electrode assembly
US2802178A (en) * 1954-09-22 1957-08-06 Gen Electric Motion detecting device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171990A (en) * 1959-07-16 1965-03-02 George Kent Stroud Ltd Electrode assembly for electromagnetic flowmeters
US3197698A (en) * 1959-12-07 1965-07-27 Pure Oil Co Temperature-controlled corrosion test probe
US3188563A (en) * 1960-02-09 1965-06-08 Dietert Co Harry W Porous electrode for air permeable moisture probe
US3467860A (en) * 1966-01-03 1969-09-16 Karl Trischberger Moisture content sensing probe including wiper means for continuous wiping of test material from probe surface
US4812741A (en) * 1987-02-10 1989-03-14 Stowell Dennis E Baler-mounted continuous moisture monitoring system
CN109203246A (zh) * 2018-09-25 2019-01-15 长江水利委员会长江科学院 一种基于细骨料含水率自动测定的混凝土生产过程自动补偿系统及方法
CN109203246B (zh) * 2018-09-25 2024-05-24 长江水利委员会长江科学院 一种基于细骨料含水率自动测定的混凝土生产过程自动补偿系统及方法

Also Published As

Publication number Publication date
CH356290A (de) 1961-08-15
FR1207720A (fr) 1960-02-18
DE1168124B (de) 1964-04-16

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