US3678629A - Centrifugal blasting wheel and blade therefor - Google Patents

Centrifugal blasting wheel and blade therefor Download PDF

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Publication number
US3678629A
US3678629A US21160A US3678629DA US3678629A US 3678629 A US3678629 A US 3678629A US 21160 A US21160 A US 21160A US 3678629D A US3678629D A US 3678629DA US 3678629 A US3678629 A US 3678629A
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United States
Prior art keywords
blade
wheel
particulate material
rotation
curved
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
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US21160A
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English (en)
Inventor
Raymond M Leliaert
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.)
Wheelabrator Corp
Original Assignee
Wheelabrator Frye Inc
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 Wheelabrator Frye Inc filed Critical Wheelabrator Frye Inc
Application granted granted Critical
Publication of US3678629A publication Critical patent/US3678629A/en
Assigned to WHEELABRATOR CORPORATION, THE reassignment WHEELABRATOR CORPORATION, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SIGNAL APPLIED TECHNOLOGIES INC.
Assigned to SIGNAL APPLIED TECHNOLOGIES INC., A CORP OF DELAWARE reassignment SIGNAL APPLIED TECHNOLOGIES INC., A CORP OF DELAWARE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 03/29/1985DE Assignors: WHEELABRATOR-FRYE INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/06—Impeller wheels; Rotor blades therefor
    • B24C5/062—Rotor blades or vanes; Locking means therefor

Definitions

  • This invention relates to centrifugal blasting wheels. More specifically, it relates to improvements in the blade structure of such wheels.
  • Centrifugal throwing or blasting wheels used for the cleaning or other treatment of the surface of workpieces such as castings have a rotor carrying a plurality of throwing blades. At the center of the rotor there are provided elements for receiving particulate material, imparting velocity to it and thus controlling its direction of discharge onto the surfaces of circumferentially spaced throwing wheels.
  • the throwing blades increase the resultant velocity of material to direct it against the surface of a workpiece.
  • Blade wear is most rapid in large part because of the manner in which the particles being propelled are picked up by the throwing surface of the blade, travel radially along its length and are accelerated.
  • the particulate material supplied to the center of the wheel is subjected to centrifugal force which is attempting to force it outwardly.
  • it is confined by the wall of the control cage except for an opening in the wall of that cage which is circumferentially adjustable to determine the direction of discharge.
  • the material leaves this opening to encounter the throwing surface of a blade and travel along that surface to the end. Because this surface has a greater angular speed than that of the material the pick-up of the particles by the surfaces of the blades in the wheel is not smooth.
  • the blade bats the particles and in this manner interrupts their direction of movement. Many particles as the result of this will bounce along the surface of the blade and cause uneven wear spots.
  • available energy is lost as the result of the significant change of direction of movement so that the final velocity is less than that theoretically available.
  • an embodiment of the invention is constituted by a blasting wheel having a plurality of radially extending throwing blades which are provided with throwing surfaces shaped to effect a smooth and efficient translation of particles of particulate material being propelled onto those surfaces.
  • FIG. I is an elevational view, partially in section, of an embodiment of the invention.
  • FIG. 2 is a sectional view along the line 2-2 of FIG. 1 of a throwing wheel in accordance with the invention.
  • FIG. 3 is a partial sectional view of a blasting wheel and blade in accordance with the invention illustrating its operation in use.
  • a throwing wheel embodying the features of this invention comprises a rear side wall-forming disc member 10 and a front side wall-forming disc member 12 which are secured one to the other'in a predetermined spaced-apart relation by spacers (not shown).
  • the rear side wall-forming member 10 is secured by bolts 16 to a hub 18 for rotational movement therewith.
  • the hub I8 is secured on a shaft 20 for rotational movement.
  • Reference numeral 22 indicates an improved throwing blade embodying the features of this invention.
  • a plurality of blades are mounted to extend crosswise between the front and rear side wall-forming disc members 10 and 12 generally in the radial direction with the outer edges 24 of the blades.
  • the outer edges may reach beyond the periphery of the wheel while the inner edges 26 terminate short of the axis about which the wheel rotates to define a central opening 28 therebetween.
  • The,wheel may be partially enclosed in a stationary housing (not shown), opened on one side so that particulate cleaning or treating material may be thrown by the wheel onto the work.
  • a control cage in the form of a tubular member 30 having an annular flange 32 extending in wardly from the rearward end thereof while its forward end portion 34 extends beyond the front wall-forming disc member 12 for engagement with means, such as the wall of the housing (not shown) so that the control cage may be supported stationarily within the central opening.
  • the control cage is provided with a discharge opening 36 in the periphery thereof through which particulate material fed into the control cage is projected onto the blades. The location of the discharge opening is adapted to be adjusted by turning movement of the control cage relative to the housing thereby to provide directional control to the particulate material thrown from the wheel.
  • an impeller 38 which may be of the type described in the patent to Straub US. Pat. No. 2,708,814 issued May 24, 1955.
  • the impeller is formed with a plurality of vanes 40 extending forwardly to a conically shaped lead-in section 42 which tapers outwardly from the feed end to the bladed section of the impeller.
  • the impeller is secured by means of a bolt 44 to the end of the shaft 20 for rotational movement with the shaft.
  • Means (not shown) are provided which communicate with a source of particulate material for the delivery of material onto the conical surface 42 of the vaned impeller 38.
  • material deposited upon the lead-in portion of the vaned impeller has a rotational movement imparted to it as it advances rearwardly over the conical surface to the vanes 40 so that the material will flow smoothly onto the vaned section where the vanes operate to propel the material outwardly with considerable force through the discharge opening 36 of the control cage 30 and onto the leading side of the inner edges of the blades or into the paths thereof.
  • the particulate material thrown by the impeller vanes tends to be urged outwardly by the centrifugal force imparted by the rotating impeller but is constrained by the inner wall of the control cage 30. Due to the velocity imparted by impeller vanes it tends to travel around that inner wall until it reaches the discharge opening 36 where it exits from that opening in an interrupted stream or slugs along the line of arrows 46 substantially tangent to the inside wall to be picked up by the leading edge of a blade. At this point it is contacted or picked up by throwing surfaces of the blades and moves radially outwardly over the faces of the blades to be thrown from the ends thereof with considerable force and velocity onto the surface to be treated.
  • the direction of the pattern formed by the particulate material thrown from the wheel may be regulated, and controlled.
  • the throwing blades 22 embodying this invention comprise elongated hardened members of generally rectangular shape having a relatively smooth top face or throwing surface 48 over which the particles of particulate material travel from the inner end 26 outwardly to be discharged centrifugally from the wheel.
  • each blade when mounted in a wheel is inserted between guides 50 formed on the inside of the discs and 12.
  • the guides are equally spaced circumferentially so that a balanced wheel is achieved.
  • the blades may be held in the wheel by any suitable means.
  • this means may take the form of a conical screw 52 passing through the wall-forming member 12 and engaging in a conical opening 54in the side of each blade.
  • wheel, blade guides and blade retaining means are illustrated for purposes of exemplification only. Other wheel designs, for instance those having only one side wall or side walls extending out to the top of the blades, and different blade retaining means may be used.
  • a blade 22 is provided with a surface 56 which is curved at its inner end in a direction away from the throwing surface 48 and the direction of the rotation of the wheel, as seen in FIGS. 2 and 3.
  • Such curvature may be termed a negative or reverse curve and continues from the inner end 26 to the blade to a point radially outwardly where it blends smoothly with the rest of the throwing surface which is straight in cross section or angles back as shown in FIG. 3.
  • the line of arrows 46 represents the path of a slug of particles being propelled through the discharge opening 36, which path is substantially tangent to the inner wall of the control cage 30.
  • the impeller and blades are assumed to be rotating counterclockwise so that the curvature of the blade 22 is to the right as shown in that drawing.
  • the first contact of the bottom of the blade with a particle occurs at a time T,.
  • T the blade has advanced to a first dotted line position and points further up or radially outwardly on the curved surface 56 are in contact with particles that have traveled further along the line 46 after discharge from the opening 36 than the first particles encountered by the bottom of the blade at the time T,.
  • the particles contacted at the time T will contact the blade at the point 58.
  • T the blade has advanced to the second dotted line position and particles still further along the line 46 will contact the surface of the blade at the point 60.
  • the points and times indicated illustrate what occurs along the entire surface 56 while the blade is picking up particles from the stream exiting from the discharge opening. After initial engagement with the surface 56, the particles travel outwardly along the rest of the surface 48 to be thrown from its outer end.
  • the curvature of the surface 56 is such that at a moment of contact with a particle a point on that surface is traveling along a line which is substantially parallel to the line 46.
  • the precise curvature of the surface 56 will be determined by the wheel parameters such as RPM, control cage radius, etc. with the objective being to have points thereon lie in a plane as near to parallel to the path of the stream of particles as possible.
  • the surface may be the arc of a circle or it may be more complex, as for instance a portion of an ellipse or the combination of the arcs of a number of circles of different radii.
  • a centrifugal blasting wheel having a rotor for rotation about an axis and provided with a central opening, means mounted within said central opening for propelling particulate material supplied thereto radially and tangentially outwardly, and a stationary control cage having an inner peripheral surface and a discharge port mounted within said central opening whereby the particulate material is propelled substantially tangentially to the inner peripheral surface of said control cage for controlling the direction of discharge of the particulate material; the improvement comprising a plurality of spaced radially extending blades having discharge ends extending from said central opening for propelling the particulate material from said discharge ends; each blade being provided with a propelling surface for engaging the particulate material, said propelling surface having a curved portion at its inner end curved away from the remainder of the propelling surface and the direction of rotation of the wheel.
  • the radius of curvature of said curved portion is such as to present a surface portion traveling in substantially the same plane as a particle of particulate material at the point of contact with such material by a blade.
  • a blade for use with a centrifugal blasting wheel having an intended direction of rotation about an axis said blade having inner and outer ends with a flat throwing surface extending therebetween for engagement with particulate material to be thrown by the wheel which surface is curved at the inner end in a direction away from its throwing surface and its intended direction of rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US21160A 1970-03-19 1970-03-19 Centrifugal blasting wheel and blade therefor Expired - Lifetime US3678629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2116070A 1970-03-19 1970-03-19

Publications (1)

Publication Number Publication Date
US3678629A true US3678629A (en) 1972-07-25

Family

ID=21802686

Family Applications (1)

Application Number Title Priority Date Filing Date
US21160A Expired - Lifetime US3678629A (en) 1970-03-19 1970-03-19 Centrifugal blasting wheel and blade therefor

Country Status (10)

Country Link
US (1) US3678629A (enrdf_load_stackoverflow)
BE (1) BE764385A (enrdf_load_stackoverflow)
BR (1) BR7101707D0 (enrdf_load_stackoverflow)
CA (1) CA924510A (enrdf_load_stackoverflow)
CH (1) CH527672A (enrdf_load_stackoverflow)
DE (1) DE2061746C3 (enrdf_load_stackoverflow)
FR (1) FR2084737A5 (enrdf_load_stackoverflow)
GB (1) GB1315337A (enrdf_load_stackoverflow)
SE (1) SE387565B (enrdf_load_stackoverflow)
ZA (1) ZA707525B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277965A (en) * 1977-11-24 1981-07-14 Cockerill Centrifugal shotting turbine
US4336672A (en) * 1980-04-21 1982-06-29 Ervin Industries, Inc. Centrifugal blasting apparatus
US6126516A (en) * 1999-05-10 2000-10-03 United States Filter Corporation Centrifugal blasting apparatus
US6764390B2 (en) 2001-11-28 2004-07-20 International Surface Preparation Group, Inc. Centrifugal throwing vane
US20050107014A1 (en) * 2003-11-17 2005-05-19 International Surface Preparation Corporation Control cage for abrasive blast wheel
WO2016048319A1 (en) * 2014-09-25 2016-03-31 Wheelabrator Group Limited Blade for centrifugal blast wheel machine and method of maintaining a centrifugal blast wheel machine
US9618002B1 (en) * 2013-09-27 2017-04-11 University Of South Florida Mini notched turbine generator
US20170144269A1 (en) * 2014-06-24 2017-05-25 Sintokogio, Ltd. Shot processing apparatus and projector

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1500092A (en) * 1975-10-24 1978-02-08 Tilghman Wheelabrator Ltd Blast impellor wheels
GB9014994D0 (en) * 1990-07-06 1990-08-29 Tilghman Wheelabrator Ltd Abrasive throwing wheel assemblies
DE102007039463A1 (de) * 2007-08-21 2009-02-26 Rösler Holding GmbH & Co. KG Strahlanordnung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108211A (en) * 1934-05-17 1938-02-15 Pangborn Corp Abrading machine
US2204632A (en) * 1934-02-05 1940-06-18 American Foundry Equip Co Abrasive throwing machine
US2286754A (en) * 1934-10-26 1942-06-16 American Foundry Equip Co Abrasive throwing machine
US2708814A (en) * 1952-09-05 1955-05-24 American Wheelabrater & Equipm Centrifugal blasting wheel
GB1003441A (en) * 1963-04-18 1965-09-02 Spencer & Halstead Ltd Blades for the impellers of blast-cleaning machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204632A (en) * 1934-02-05 1940-06-18 American Foundry Equip Co Abrasive throwing machine
US2108211A (en) * 1934-05-17 1938-02-15 Pangborn Corp Abrading machine
US2286754A (en) * 1934-10-26 1942-06-16 American Foundry Equip Co Abrasive throwing machine
US2708814A (en) * 1952-09-05 1955-05-24 American Wheelabrater & Equipm Centrifugal blasting wheel
GB1003441A (en) * 1963-04-18 1965-09-02 Spencer & Halstead Ltd Blades for the impellers of blast-cleaning machines

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277965A (en) * 1977-11-24 1981-07-14 Cockerill Centrifugal shotting turbine
US4366690A (en) * 1977-11-24 1983-01-04 Cockerill Sambre Centrifugal shotting turbine
US4336672A (en) * 1980-04-21 1982-06-29 Ervin Industries, Inc. Centrifugal blasting apparatus
US6126516A (en) * 1999-05-10 2000-10-03 United States Filter Corporation Centrifugal blasting apparatus
US6764390B2 (en) 2001-11-28 2004-07-20 International Surface Preparation Group, Inc. Centrifugal throwing vane
US6949014B2 (en) 2003-11-17 2005-09-27 Wheelabrator Group, Inc. Control cage for abrasive blast wheel
US20050107014A1 (en) * 2003-11-17 2005-05-19 International Surface Preparation Corporation Control cage for abrasive blast wheel
US9618002B1 (en) * 2013-09-27 2017-04-11 University Of South Florida Mini notched turbine generator
US20170144269A1 (en) * 2014-06-24 2017-05-25 Sintokogio, Ltd. Shot processing apparatus and projector
US10035241B2 (en) * 2014-06-24 2018-07-31 Sintokogio, Ltd. Shot processing apparatus and projector
WO2016048319A1 (en) * 2014-09-25 2016-03-31 Wheelabrator Group Limited Blade for centrifugal blast wheel machine and method of maintaining a centrifugal blast wheel machine
CN106715050A (zh) * 2014-09-25 2017-05-24 维尔贝莱特集团有限公司 用于离心式抛丸机的叶片及离心式抛丸机的维护方法
US10384327B2 (en) 2014-09-25 2019-08-20 Wheelabrator Group Limited Blade for centrifugal blast wheel machine and method of maintaining a centrifugal blast wheel machine
RU2709317C2 (ru) * 2014-09-25 2019-12-17 Вилабратор Груп Лимитед Лопатка для центробежной дробеметной турбинной машины и способ обслуживания центробежной дробеметной турбинной машины

Also Published As

Publication number Publication date
CH527672A (de) 1972-09-15
DE2061746C3 (de) 1980-03-20
ZA707525B (en) 1971-07-28
GB1315337A (en) 1973-05-02
DE2061746B2 (de) 1979-07-19
BR7101707D0 (pt) 1973-04-26
FR2084737A5 (enrdf_load_stackoverflow) 1971-12-17
BE764385A (fr) 1971-08-16
SE387565B (sv) 1976-09-13
CA924510A (en) 1973-04-17
DE2061746A1 (enrdf_load_stackoverflow) 1971-12-23

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AS Assignment

Owner name: SIGNAL APPLIED TECHNOLOGIES INC., A CORP OF DELAWA

Free format text: MERGER;ASSIGNOR:WHEELABRATOR-FRYE INC.;REEL/FRAME:004530/0016

Effective date: 19850329

Owner name: WHEELABRATOR CORPORATION, THE, INDIANA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SIGNAL APPLIED TECHNOLOGIES INC.;REEL/FRAME:004530/0026

Effective date: 19860115