[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US3779520A - Mixing chamber construction - Google Patents

Mixing chamber construction Download PDF

Info

Publication number
US3779520A
US3779520A US00237700A US3779520DA US3779520A US 3779520 A US3779520 A US 3779520A US 00237700 A US00237700 A US 00237700A US 3779520D A US3779520D A US 3779520DA US 3779520 A US3779520 A US 3779520A
Authority
US
United States
Prior art keywords
mixing chamber
blade means
blades
mixing
pair
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
US00237700A
Inventor
A Edwards
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.)
Baker Perkins Ltd
Original Assignee
Baker Perkins 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
Application filed by Baker Perkins Ltd filed Critical Baker Perkins Ltd
Application granted granted Critical
Publication of US3779520A publication Critical patent/US3779520A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0463—Plants

Definitions

  • ABSTRACT A mixing chamber for mixing cold-setting foundry sand mixtures comprising a cylindrical wall, a base, a roof, a material inlet, a material outlet and a rotary mixing element.
  • the mixing element has an axis which is substantially co-axial with the axis of the cylindrical wall.
  • the mixing chamber further has a first pair of diametrically opposed blades to sweep the base of the chamber during rotation of the element and a second pair of diametrically opposed blades, angularly offset from the first pair of blades, to sweep thecylindrical wall of the chamber during rotation of the element.
  • This invention relates to a mixing chamber construction useful, for example, for mixing cold-setting foundry sand mixtures in the preparation of foundry moulds or cores.
  • the invention provides a mixing chamber construction comprising a cylindrical wall, a base, a roof, a material inlet, a material outlet, and a rotary mixing element in the chamber, the element having an axis substantially coaxial with the axis of said cylindrical wall and having first blade means adapted to sweep the base during rotation of the element and second blade means angularly offset from the first blade means and adapted to sweep the cylindrical wall during rotation of the element.
  • the first blade means may comprise a pair of angle iron members mounted tangentially relative to said axis and having rigid blades attached thereto or alternatively, the first blade means may comprise a relatively flexible pair of diametrically opposed blades, for example, spring steel blades.
  • Said second blade means may comprise a relatively flexible pair of diametrically opposed blades, such as spring steel blades and the degree of angular offset between the first and second blade means can be anything up to 90.
  • cylindrical wall can have tangentially disposed ports for introducing gas under pressure into the chamber for purging purposes.
  • the second blade means are fixedly attached to a cross-member which also serves to sweep the roof of the chamber.
  • the mixing chamber may be used as a batch mixer whereinmetered amounts of the two' sep'arate mixer are introduced into'the mixing chamber and intermixed for a predetermined time period for example about 10 seconds for foundry mixtures.
  • FIG. 1 is a perspective view of apparatus for preparing foundry moulds and cores.
  • FIG. 2 is a plan view of the mixing chamber, with the upper part of the mixing chamber removed for clarity.
  • FIG. 3 is a plan view showing an alternative form of a lower part of a mixing element for the mixing chamber.
  • FIG. 4 is a sectional view along line 4-4 of FIG. 3.
  • a pair of continuous screw-type mixer conveyor units 1, for example units of the kind described in our UK. Patent Specification No. 1051651 supplied with metered quantites of sand and resin and sand and catalyst respectively, discharge their resultant mixtures into a cylindrical mixing chamber 2 through a divided hopper 3 and an inlet 3a in the roof of the chamber under the control of a valve 4.
  • the valve 4 and units I operate for a time sufficient to supply an amount of material to the chamber slightly in excess of that required for a mould or core being prepared.
  • the mixing chamber incorporates a vertical axis rotary mechanical mixing element having a first pair of blades 5 made of spring steel which sweep the base of the chamber, these blades being inclined at about 45 to the vertical, and a second pair of spring steel blades 6 angularly offset from the first pair and which sweep the vertical cylindrical wall of the chamber, the second blades being inclined at about 30 to the chamber radius.
  • the mixing element is rotated at about RPM, and it has been found that with this arrangement, as the mixtures from units 1 fall through the mixing chamber they can be intermixed in about three quarters of a revolution of the mixing element.
  • An outlet 7 in the base of the mixing chamber leading to a blowing chamber 8 is accordingly suitably angularly offset from the inlet 3a.
  • the mixing chamber can be used as a batch mixer.
  • FIGS. 3 and 4 an alternative form of the first pair of blades 5 of the mixing element is shown.
  • the blades 5 comprise twotangentially mounted angle iron members 5a having rigid blades 5b attached thereto, in place of the folds ll.
  • the compressed air purges the mixing chamber of any remaining material and builds up pressure on the final mixture in the blowing chamber. Then, when the pressure reaches a suitable blowing level, the air supply is terminated, and valve 9 is opened to allow the final mixture to be blown into a mould or core box on a lifting table 12, the box being held by side clamps 13 and to the base of the blowing chamber by lifting table 12.
  • valve 9 is again closed, the core or mould box is released and lowered and the mixing chamber 2 with communicating blowing chamber moved to position marked A. Then valve 9 is re-opened to discharge any remaining mixture into a suitable :receptacleKnot shown) via conduit 14 and to reduce the'pressure in the mixing and blowing chambers to atmospheric. Thapparatusjcan then be re turned to its original position and the process repeated for another mould or core.
  • a mixing chamber according to claim 1 wherein said first blade means comprises a pair of angle iron members mounted tangentially relative to said axis and having rigid blades attached thereto.
  • a mixing chamber according to claim 4 wherein the blades of said first blade means are inclined about their longitudinal axes relative to said axis.
  • a mixing chamber according to claim 6 wherein said pair of diametrically opposed blades of said second blade means comprises spring steel blades.
  • each blade of said second blade means is inclined, about a longitudinal axis thereof, relative to the mixing chamber radius.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Accessories For Mixers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A mixing chamber for mixing cold-setting foundry sand mixtures comprising a cylindrical wall, a base, a roof, a material inlet, a material outlet and a rotary mixing element. The mixing element has an axis which is substantially co-axial with the axis of the cylindrical wall. The mixing chamber further has a first pair of diametrically opposed blades to sweep the base of the chamber during rotation of the element and a second pair of diametrically opposed blades, angularly offset from the first pair of blades, to sweep the cylindrical wall of the chamber during rotation of the element.

Description

United States Patent [1 Edwards 51 Dec. 13, 1973 MIXING CHAMBER CONSTRUCTION [75] lnventor: Albert Edwards, Peterborough,
England [73] Assignee: Baker Perkins Limited,
Petersborough, England [22] Filed: Mar. 24, I972 [21] Appl. No.: 237,700
[30] Foreign Application Priority Data Mar. 29, 1971 Great Britain 8,095/71 Dec. 1, 1971 Great Britain 55,725/71 [52] U.S. Cl ..259/l 51, 259/7, 259/161, 7 259/178 A [51] Int. Cl. B286 5/16, B220 5/04, BOlf 7/16 [58] Field of Search 259/7, 8, 161, 162, 259/163, 178 R, 178 A, DIG. 34, 151
[ 56] References: Cited UNlTED STATES PATENTS 2,899,182 8/1959 Ridley 259/151 3,348,819 10/1967 Mcllvaine..... 3,406,950 10/1968 Mcllvaine 259/151 478,667 7/1892 Wagner 259/8 3,494,412 2/1970 Abraham 259/8 X 1,997,035 4/1935 Arbuckle 259/D1G. 34 2,021,153 11/1935 Sawyer 259/D1G. 34 3,278,659 10/1966 Willy 259/8 X FORElGN PATENTS OR APPLICATIONS V1,419 5/1956 Germany 259/8 Primary Examiner-Harvey C. l-lornsby Assistant Examiner-Philip R. Coe Attorney-Roberts B. Larson et a1.
[57] ABSTRACT A mixing chamber for mixing cold-setting foundry sand mixtures comprising a cylindrical wall, a base, a roof, a material inlet, a material outlet and a rotary mixing element. The mixing element has an axis which is substantially co-axial with the axis of the cylindrical wall. The mixing chamber further has a first pair of diametrically opposed blades to sweep the base of the chamber during rotation of the element and a second pair of diametrically opposed blades, angularly offset from the first pair of blades, to sweep thecylindrical wall of the chamber during rotation of the element.
10 Claims, 4 Drawing Figures MIXING CHAMBER CONSTRUCTION This invention relates to a mixing chamber construction useful, for example, for mixing cold-setting foundry sand mixtures in the preparation of foundry moulds or cores.
The invention provides a mixing chamber construction comprising a cylindrical wall, a base, a roof, a material inlet, a material outlet, and a rotary mixing element in the chamber, the element having an axis substantially coaxial with the axis of said cylindrical wall and having first blade means adapted to sweep the base during rotation of the element and second blade means angularly offset from the first blade means and adapted to sweep the cylindrical wall during rotation of the element.
The first blade means may comprise a pair of angle iron members mounted tangentially relative to said axis and having rigid blades attached thereto or alternatively, the first blade means may comprise a relatively flexible pair of diametrically opposed blades, for example, spring steel blades.
Said second blade means may comprise a relatively flexible pair of diametrically opposed blades, such as spring steel blades and the degree of angular offset between the first and second blade means can be anything up to 90.
According to a further feature of the invention the cylindrical wall can have tangentially disposed ports for introducing gas under pressure into the chamber for purging purposes.
Preferably, the second blade means are fixedly attached to a cross-member which also serves to sweep the roof of the chamber.
It has been found that with a construction according to the invention, if the rotary element is rotated at about 120 RPM foundry materials introduced to the inlet can be intermixed as they fall through the chamber, in about three quarters of a revolution of the mixing element. The inlet and outlet may therefore be angularly offset accordingly.
Alternatively, the mixing chamber may be used as a batch mixer whereinmetered amounts of the two' sep'arate mixer are introduced into'the mixing chamber and intermixed for a predetermined time period for example about 10 seconds for foundry mixtures.
The invention will now be described by way of an'example with reference to the accompanying drawings in which FIG. 1 is a perspective view of apparatus for preparing foundry moulds and cores.
FIG. 2 is a plan view of the mixing chamber, with the upper part of the mixing chamber removed for clarity.
FIG. 3 is a plan view showing an alternative form of a lower part of a mixing element for the mixing chamber.
FIG. 4 is a sectional view along line 4-4 of FIG. 3.
Referring to FIGS. 1 and 2, a pair of continuous screw-type mixer conveyor units 1, for example units of the kind described in our UK. Patent Specification No. 1051651 supplied with metered quantites of sand and resin and sand and catalyst respectively, discharge their resultant mixtures into a cylindrical mixing chamber 2 through a divided hopper 3 and an inlet 3a in the roof of the chamber under the control of a valve 4. The valve 4 and units I operate for a time sufficient to supply an amount of material to the chamber slightly in excess of that required for a mould or core being prepared.
The mixing chamber incorporates a vertical axis rotary mechanical mixing element having a first pair of blades 5 made of spring steel which sweep the base of the chamber, these blades being inclined at about 45 to the vertical, and a second pair of spring steel blades 6 angularly offset from the first pair and which sweep the vertical cylindrical wall of the chamber, the second blades being inclined at about 30 to the chamber radius. The mixing element is rotated at about RPM, and it has been found that with this arrangement, as the mixtures from units 1 fall through the mixing chamber they can be intermixed in about three quarters of a revolution of the mixing element. An outlet 7 in the base of the mixing chamber leading to a blowing chamber 8 is accordingly suitably angularly offset from the inlet 3a.
Alternatively, the mixing chamber can be used as a batch mixer. Referring to FIGS. 3 and 4, an alternative form of the first pair of blades 5 of the mixing element is shown. In this embodiment, the blades 5 comprise twotangentially mounted angle iron members 5a having rigid blades 5b attached thereto, in place of the folds ll. The compressed air purges the mixing chamber of any remaining material and builds up pressure on the final mixture in the blowing chamber. Then, when the pressure reaches a suitable blowing level, the air supply is terminated, and valve 9 is opened to allow the final mixture to be blown into a mould or core box on a lifting table 12, the box being held by side clamps 13 and to the base of the blowing chamber by lifting table 12. After the core has been blown, valve 9 is again closed, the core or mould box is released and lowered and the mixing chamber 2 with communicating blowing chamber moved to position marked A. Then valve 9 is re-opened to discharge any remaining mixture into a suitable :receptacleKnot shown) via conduit 14 and to reduce the'pressure in the mixing and blowing chambers to atmospheric. Thapparatusjcan then be re turned to its original position and the process repeated for another mould or core.
Whilst the above description relates to apparatus in which the mixing chamber is combined with a blowing chamber, it is to be understood that a mixing chamber construction according to the invention can be used in other applications for example with a conventional core shooter as disclosed in our co-pending application No. 8094/71 which has been cognated with our other co-pending application No. 59541/71.
I claim:
1. A mixing chamber for cold-setting foundry sand mixtures comprising a cylindrical wall, a base, a roof, a'material inlet, a. material outlet, a rotary mixing element in the chamber, the element having an axis substantially coaxial with the axis of said cylindrical wall and'having first blade means adapted to sweep the base during rotation of the element and second blade means angularly offset from the first blade means and adapted said cylindrical wall and means for introducing gas under pressure to the chamber through said ports to purge the chamber.
2. A mixing chamber according to claim 1 wherein said first blade means comprises a pair of angle iron members mounted tangentially relative to said axis and having rigid blades attached thereto.
3. A mixing chamber according to claim 1 wherein said first blade means comprises a relatively flexible pair of diametrically opposed blades.
4. A mixing chamber according to claim 3 wherein said pair of diametrically opposed blades comprises spring steel blades.
5. A mixing chamber according to claim 4 wherein the blades of said first blade means are inclined about their longitudinal axes relative to said axis.
6. A mixing chamber according to claim 4 wherein said second blade means comprises a relatively flexible pair of diametrically opposed blades.
7. A mixing chamber according to claim 6 wherein said pair of diametrically opposed blades of said second blade means comprises spring steel blades.
8. A mixing chamber according to claim 7 wherein each blade of said second blade means is inclined, about a longitudinal axis thereof, relative to the mixing chamber radius.
9. A mixing chamber according to claim 1 wherein said second blade means are fixedly attached to a crossmember which also serves to sweep the roof of the mixing chamber.
10. A mixing chamber according to claim 1 wherein the outlet of the mixing chamber is offset from the inlet thereof through 270 in a direction of rotation of the mixing element.

Claims (10)

1. A mixing chamber for cold-setting foundry sand mixtures comprising a cylindrical wall, a base, a roof, a material inlet, a material outlet, a rotary mixing element in the chamber, the element having an axis substantially coaxial with the axis of said cylindrical wall and having first blade means adapted to sweep the base during rotation of the element and second blade means angularly offset from the first blade means and adapted to sweep the cylindrical wall during Rotation of the element, means defining tangentially disposed ports in said cylindrical wall and means for introducing gas under pressure to the chamber through said ports to purge the chamber.
2. A mixing chamber according to claim 1 wherein said first blade means comprises a pair of angle iron members mounted tangentially relative to said axis and having rigid blades attached thereto.
3. A mixing chamber according to claim 1 wherein said first blade means comprises a relatively flexible pair of diametrically opposed blades.
4. A mixing chamber according to claim 3 wherein said pair of diametrically opposed blades comprises spring steel blades.
5. A mixing chamber according to claim 4 wherein the blades of said first blade means are inclined about their longitudinal axes relative to said axis.
6. A mixing chamber according to claim 4 wherein said second blade means comprises a relatively flexible pair of diametrically opposed blades.
7. A mixing chamber according to claim 6 wherein said pair of diametrically opposed blades of said second blade means comprises spring steel blades.
8. A mixing chamber according to claim 7 wherein each blade of said second blade means is inclined, about a longitudinal axis thereof, relative to the mixing chamber radius.
9. A mixing chamber according to claim 1 wherein said second blade means are fixedly attached to a cross-member which also serves to sweep the roof of the mixing chamber.
10. A mixing chamber according to claim 1 wherein the outlet of the mixing chamber is offset from the inlet thereof through 270* in a direction of rotation of the mixing element.
US00237700A 1971-03-29 1972-03-24 Mixing chamber construction Expired - Lifetime US3779520A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB809571A GB1369446A (en) 1971-03-29 1971-03-29 Mixing chamber construction
GB5572571 1971-12-01

Publications (1)

Publication Number Publication Date
US3779520A true US3779520A (en) 1973-12-18

Family

ID=26241921

Family Applications (1)

Application Number Title Priority Date Filing Date
US00237700A Expired - Lifetime US3779520A (en) 1971-03-29 1972-03-24 Mixing chamber construction

Country Status (6)

Country Link
US (1) US3779520A (en)
JP (1) JPS547978B1 (en)
DE (1) DE2215886C3 (en)
FR (1) FR2132147B1 (en)
GB (1) GB1369446A (en)
IT (1) IT950890B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943991A (en) * 1972-07-14 1976-03-16 Baker Perkins Holdings Limited Method and apparatus for preparing foundry moulds or cores
US3980282A (en) * 1974-03-18 1976-09-14 Pettibone Corporation Material mixing apparatus
US4037826A (en) * 1976-04-26 1977-07-26 Dependable-Fordath, Inc. Mixing apparatus having plurality of different blades with multiple functions
US4042221A (en) * 1974-04-22 1977-08-16 Myers Claude K Tilt mixer
US4126398A (en) * 1973-03-02 1978-11-21 Bepex Corporation Foundry mixer system with gas assisted resin injection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107650264B (en) * 2017-10-27 2019-09-24 潘小秋 A kind of power construction pylon pedestal, which is built, is mixed equipment with cement sand

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1419C (en) * 1877-11-24 TH. FUNK in Roubaix, Frankreich Process for the production of velvet fabrics
US478667A (en) * 1892-07-12 Mashing apparatus
US1997035A (en) * 1932-08-20 1935-04-09 Julius I Corn Agitator for milk products
US2021153A (en) * 1934-10-19 1935-11-19 Irving L Keith Ice cream freezer
US2899182A (en) * 1959-08-11 ridley
US3278659A (en) * 1963-02-26 1966-10-11 Specialty Converters Method and apparatus for casting foam plastic sheets on a curved casting surface
US3348819A (en) * 1964-12-07 1967-10-24 Nat Eng Co Apparatus for conditioning particulate material
US3406950A (en) * 1965-10-23 1968-10-22 Nat Eng Co Apparatus for conditioning material
US3494412A (en) * 1967-03-29 1970-02-10 Sherwin Williams Co Foundry mold blowing machine with multi-stage mixer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS455347Y1 (en) * 1966-08-02 1970-03-13

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US478667A (en) * 1892-07-12 Mashing apparatus
US2899182A (en) * 1959-08-11 ridley
DE1419C (en) * 1877-11-24 TH. FUNK in Roubaix, Frankreich Process for the production of velvet fabrics
US1997035A (en) * 1932-08-20 1935-04-09 Julius I Corn Agitator for milk products
US2021153A (en) * 1934-10-19 1935-11-19 Irving L Keith Ice cream freezer
US3278659A (en) * 1963-02-26 1966-10-11 Specialty Converters Method and apparatus for casting foam plastic sheets on a curved casting surface
US3348819A (en) * 1964-12-07 1967-10-24 Nat Eng Co Apparatus for conditioning particulate material
US3406950A (en) * 1965-10-23 1968-10-22 Nat Eng Co Apparatus for conditioning material
US3494412A (en) * 1967-03-29 1970-02-10 Sherwin Williams Co Foundry mold blowing machine with multi-stage mixer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943991A (en) * 1972-07-14 1976-03-16 Baker Perkins Holdings Limited Method and apparatus for preparing foundry moulds or cores
US4126398A (en) * 1973-03-02 1978-11-21 Bepex Corporation Foundry mixer system with gas assisted resin injection
US3980282A (en) * 1974-03-18 1976-09-14 Pettibone Corporation Material mixing apparatus
US4042221A (en) * 1974-04-22 1977-08-16 Myers Claude K Tilt mixer
US4037826A (en) * 1976-04-26 1977-07-26 Dependable-Fordath, Inc. Mixing apparatus having plurality of different blades with multiple functions

Also Published As

Publication number Publication date
FR2132147A1 (en) 1972-11-17
GB1369446A (en) 1974-10-09
JPS547978B1 (en) 1979-04-11
DE2215886C3 (en) 1978-07-27
FR2132147B1 (en) 1976-10-29
DE2215886A1 (en) 1972-10-12
DE2215886B2 (en) 1977-12-08
IT950890B (en) 1973-06-20

Similar Documents

Publication Publication Date Title
US5433520A (en) Method and apparatus for continuously processing particulate cementitious material and fly ash solids and mixing them with a liquid to provide a liquid slurry of consistent proportions
US3661365A (en) Apparatus for proportioning dry particulate materials
US3779520A (en) Mixing chamber construction
US1694563A (en) Method of molding ceramic materials
US3822737A (en) Apparatus for preparing foundry molds or cores from cold quick setting sand/binder/catalyst mixtures
GB1200507A (en) Production of foundry cores
US4231664A (en) Method and apparatus for combining high speed horizontal and high speed vertical continuous mixing of chemically bonded foundry sand
US3198867A (en) Method for processing slurry
EP0394785A1 (en) Means and process for automatic coloring of concrete
US3834442A (en) Method and apparatus for the preparation of foundry moulds or cores
US7887738B2 (en) Brick and method for its manufacture
CA1208875A (en) Method and apparatus for blowing cores etc. using a plunger-cleaned blow box suitable for quick-set sand
US4174740A (en) Method and apparatus for supplying ingredients to a concrete mixer
KR20040015395A (en) A sand mixing device
US3771770A (en) Apparatus for making molded articles from foamed synthetic material
US3912238A (en) Process and installation for the distribution, into a mold, by high speed projection, of a granular and/or pulverulent mixture
CN100591514C (en) Method and apparatus for producing conglomerate stone blocks
US776137A (en) Machine for molding building-blocks.
US2735625A (en) B freeman
US949886A (en) Concrete-molding machine.
US3943991A (en) Method and apparatus for preparing foundry moulds or cores
JP2607899B2 (en) Casting equipment in the manufacturing equipment for solidified molded products
JPS6113149Y2 (en)
US3688814A (en) Machine for use in the manufacture of grinding wheels
GB1341983A (en) Production of foundry cores