[go: up one dir, main page]

US3609921A - Tumbling mill - Google Patents

Tumbling mill Download PDF

Info

Publication number
US3609921A
US3609921A US1585A US3609921DA US3609921A US 3609921 A US3609921 A US 3609921A US 1585 A US1585 A US 1585A US 3609921D A US3609921D A US 3609921DA US 3609921 A US3609921 A US 3609921A
Authority
US
United States
Prior art keywords
chamber
mill
tumbling mill
track
tumbling
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
US1585A
Inventor
Cecil A Foster
George W Booth
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
Application granted granted Critical
Publication of US3609921A publication Critical patent/US3609921A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work

Definitions

  • a tumbling mill is provided for use in grinding, pulverizing and polishing various materials.
  • the mill is adapted to generate a multiplicity of motions.
  • a mill chamber rotates about a horizontal axis around a closed, undulating track, moving radially in and out with respect to a vertical driving axis, which driving axis itself reciprocates vertically causing the chamber to tilt about its horizontal axis.
  • Field of the invention relates generally to tumbling mills and more particularly is directed towards a tumbling mill of improved design and efficiency having a multiplicity of motions from a single rotary drive.
  • Tumbling mills generally are comprised of a shell or drum rotating about a horizontal axis. Whatever material is to be reduced in size is fed into one end of the mill along with a charge of a suitable grinding medium such as iron balls or the like. As the mill rotates the material and the grinding medium tumble against one another in a cooperating action which grinds, polishes or pulverizes the material. Mills of this type customarily have very limited motions and as a result require a relatively long period of operation in which to achieve the desired grinding action.
  • Another object of the present invention is to provide improvements in tumbling mills. Another object of this invention is to provide a simple, low most tumbling mill having a multiplicity of motions adapted to increase the grinding, speed and efliciency of the appar'atus.
  • This invention features a tumbling mill comprising a vertical drive shaft axially reciprocating a pivoted, telescoping horizontal rod connected to the vertical drive shaft and to a chamber mounted for rotation about the horizontal axis on an undulating, generally circular closed track.
  • a variable speed motor is connected to the drive shaft causing the chamber to rotate about a horizontal axis, cyclically tilting about that axis while moving upwardly, downwardly and radially in and out as it operates.
  • FIG. 1 is a top plan view of a tumbling mill made. according to the invention.
  • FIG. 2 is a fragmentary sectional view in side elevation thereof, and,
  • FIG. 3 is a detailed sectional view showing the connection between the chamber portions.
  • the reference character generally indicates a base for a tumbling mill, the base being comprised of a lower bed plate 12 supporting a platform 14 by means of upright posts 16.
  • the platform supports a closed track 18 in the form of a cylindrical rod, which in top plan view as shown in FIG. 1, is in the form of a distorted circle somewhat flattened on four sides and which undulates in a vertical plane as best shown in FIG. 2.
  • the track 18 is supported on the platform 14 by means of spaced ribs 20.
  • a drive assembly comprised of a drive shaft 22 rotatably mounted in a lower bearing 24 fixed to the bed plate 12.
  • the shaft 22 drivingly engages a pulley 26 connected by a belt 28 to a variable speed motor and reduction gear assembly 30 located to the side of the unit.
  • the shaft 22 engages a coupling 32 which in turn engages a drive shaft 34 rotatably mounted in a bearing 36 supported by cross pieces 38 to the platform 14.
  • Drivingly connected to the shaft 34 is a cam 40 engaging a follower 42 mounted to a shaft 44 telescoped over the shaft 34.
  • a hinge coupling 46 engaging the inner end of a connecting rod 48 normally disposed in the horizontal plane and provided at its outer portion with a tubular member 50 telescoped over the inner end of a tie rod 52.
  • the tie rod 52 is provided with a coil spring 54 trapped between a bushing 56 secured to the member 50 and an annulus 58 on the inner end of the tie rod 52.
  • the arrangement provides a spring-loaded sliding connection between the rods 48 and 52 which also permits the rod 52 to rotate freely with respect to the rod 48.
  • a rotatable chamber 60 secured to the rod in the illustrated embodiment by means of a screw 62 passing through an opening in the end wall of the chamber and is threaded to the tapped end of the rod 52.
  • a boss 64 is formed at the end of the chamber for reinforcement thereof at the connecting joint.
  • the chamber 60 in the preferred embodiment, has an ovoidal configuration and is comprised of a pair of separable sections 66 and '68 connected to one another at the center.
  • the chamber sections 66 and 68 are circular in cross section and each is formed with cooperating contoured flanges 70 and 72 which come together to form annular groove 74 adapted to fit over and roll about the track 18.
  • the flanges on either side of the groove extend out for some distance from the chamber walls to encompass the track 18 and to insure that the chamber remains on the track even at high rotational speeds.
  • the chamber halves detachably connect to one another by means of cooperating threads 76 formed at the center line behind the annular groove 74.
  • Other locking arrangements obviously may be provided to permit the chamber to be opened and closed for easy loading and unloading of the charge of material and the grinding medium.
  • the interior walls of the chamber 60 are lined with a stratum 78 of rubber or other resilient material which not only lowers the noise level of the unit in operation but also aids in the grinding action since it enhances the bouncing of loose material within the chamber.
  • the grinding action may be further enhanced by adding abrasive material to the liner 78.
  • the abrasive can be coated over the surface of the resilient liner as by spraying the same together with a binder onto the liner.
  • abrasive inserts may be set into the resilient layer with the outer portions of the inserts either flush with the surface of the liner or protruding therefrom to interact with the charge of material in the chamber.
  • polishing agents may be placed in the chamber either in the form of dry material or suspended in a liquid as best suited for the particular task.
  • the hinge mounting of the rod 48 permits the chamber 60 to be raised from the horizontal position illustrated into a vertical or nearly vertical position for loading and unloading purposes.
  • the chamber section 66 is unscrewed from the section 68 and the charge of material as well as the grinding medium are deposited in the raised section 68.
  • the section 66 is then screwed .back into position and the chamber lowered to the horizontal position with the groove 74 placed over the track, the weight of the chamber together with its charge being sufficient frictional force to insure rotation of the chamber as it moves about the track.
  • the chamber not only will rotate but will tilt about its axis by reason of the .cam and follower 40 and 42 and the undulating rail 18.
  • the chamber will move radially in and out to add another motion component by reason of the flattened configuration of the track.
  • the added motions enhance the polishing and grinding action and speed up the processing on the charge.
  • the operation can be further accelerated by speeding up the motor drive as required.
  • a tumbling mill comprising: (a) a container adapted to receive a charge of material, (b) an irregularly contoured generally horizontal closed track adapted to support and guide said container, (0) an annular member mounted to said container for rolling engagement with said track, (d) a vertical drive shaft extending centrally through said track, (e) an extensible member connecting said shaft to said container whereby said chamber will be rolled about said track upon rotation of said shaft, and
  • a tumbling mill according to claim 1 including means for axially reciprocating at least a portion of said drive shaft to cause said container to tilt about its axis upon rotation thereof.
  • a tumbling mill accordingtolclairn 1 wherein said extensible member is pivoted to .said drive shaft.
  • a tumbling mill according to claim 1 including a stratum of resilient material over the inner walls of said container.
  • a tumbling mill according to claim 5 including an abrasive medium bonded to said stratum.
  • said extensible member includes a pair of relatively rotatable, spring-loaded elongated members telescopically connected to one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)

Abstract

A TUMBLING MILL IS PROVIDED FOR USE IN GRIDING, PULVERIZING AND POLISHING VARIOUS MATERIALS. THE MILL IS ADAPTED TO GENERATE A MULTIPLICITY OF MOTIONS. A MILL CHAMBER ROTATES ABOUT A HORIZONTAL AXIS AROUND A CLOSED, UNDULATING TRACK MOVING RADIALLY IN AND OUT WITH RESPECT TO A VERTICAL DRIVING AXIS, WHICH DRIVING AXIS ITSELF RECIPROCATES VERTICALLY CAUSING THE CHAMBER TO TILT ABOUT ITS HORIZONTAL AXIS.

Description

Oct. 5, 1971 Q FOSTER EI'AL 3,609,921
TUMBLING MILL Filed Jan. 9, 1970 2 Sheets-Sheet 1 INVENTD RS.
CECIL A. FOSTER GEORGE W. BOOTH IYWM' mkot ATTORNEYS Oct. 5, 1971 c. A. FOSTER EI'AL 3,609,921
TUMBLING MILL Filed Jan. 9, 1970 2 Sheets-Sheet 2 INVENTORS.
CECIL. A. FOSTER GEORGE W. BOOTH ATTORN EYS United States Patent O 3,609,921. TUMBLING MILL Cecil A. Foster, 25 Fairmount Ave., Johnston, RJ. 02919, and George W. Booth, West Main St, West Barnstable, Mass. 02630 Filed Jan. 9, 1970, Ser. No. 1,585
Int. Cl. B24b 31/02 US. Cl. 51-164 8 Claims ABSTRACT OF THE DISCLOSURE A tumbling mill is provided for use in grinding, pulverizing and polishing various materials. The mill is adapted to generate a multiplicity of motions. A mill chamber rotates about a horizontal axis around a closed, undulating track, moving radially in and out with respect to a vertical driving axis, which driving axis itself reciprocates vertically causing the chamber to tilt about its horizontal axis.
BACKGROUND OF THE INVENTION (1) Field of the invention This invention relates generally to tumbling mills and more particularly is directed towards a tumbling mill of improved design and efficiency having a multiplicity of motions from a single rotary drive.
(2) Summary of the prior art Tumbling mills generally are comprised of a shell or drum rotating about a horizontal axis. Whatever material is to be reduced in size is fed into one end of the mill along with a charge of a suitable grinding medium such as iron balls or the like. As the mill rotates the material and the grinding medium tumble against one another in a cooperating action which grinds, polishes or pulverizes the material. Mills of this type customarily have very limited motions and as a result require a relatively long period of operation in which to achieve the desired grinding action.
Accordingly, it is an object of the present invention to provide improvements in tumbling mills. Another object of this invention is to provide a simple, low most tumbling mill having a multiplicity of motions adapted to increase the grinding, speed and efliciency of the appar'atus.
SUMMARY OF THE INVENTION This invention features a tumbling mill comprising a vertical drive shaft axially reciprocating a pivoted, telescoping horizontal rod connected to the vertical drive shaft and to a chamber mounted for rotation about the horizontal axis on an undulating, generally circular closed track. A variable speed motor is connected to the drive shaft causing the chamber to rotate about a horizontal axis, cyclically tilting about that axis while moving upwardly, downwardly and radially in and out as it operates.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top plan view of a tumbling mill made. according to the invention,
FIG. 2 is a fragmentary sectional view in side elevation thereof, and,
FIG. 3 is a detailed sectional view showing the connection between the chamber portions.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, the reference character generally indicates a base for a tumbling mill, the base being comprised of a lower bed plate 12 supporting a platform 14 by means of upright posts 16. The platform, in turn, supports a closed track 18 in the form of a cylindrical rod, which in top plan view as shown in FIG. 1, is in the form of a distorted circle somewhat flattened on four sides and which undulates in a vertical plane as best shown in FIG. 2. The track 18 is supported on the platform 14 by means of spaced ribs 20.
Extending up through the center of the base and platform is a drive assembly comprised of a drive shaft 22 rotatably mounted in a lower bearing 24 fixed to the bed plate 12. The shaft 22 drivingly engages a pulley 26 connected by a belt 28 to a variable speed motor and reduction gear assembly 30 located to the side of the unit. The shaft 22 engages a coupling 32 which in turn engages a drive shaft 34 rotatably mounted in a bearing 36 supported by cross pieces 38 to the platform 14. Drivingly connected to the shaft 34 is a cam 40 engaging a follower 42 mounted to a shaft 44 telescoped over the shaft 34. Thus, as the shaft 22 is rotated by the variablespeed motor, shaft 44 will also rotate about the vertical axis while at the same time undergoing vertical reciprocation as a result of the interaction between the cam and follower 40 and 42.
Mounted to the top of the shaft 24 is a hinge coupling 46 engaging the inner end of a connecting rod 48 normally disposed in the horizontal plane and provided at its outer portion with a tubular member 50 telescoped over the inner end of a tie rod 52. The tie rod 52 is provided with a coil spring 54 trapped between a bushing 56 secured to the member 50 and an annulus 58 on the inner end of the tie rod 52. The arrangement provides a spring-loaded sliding connection between the rods 48 and 52 which also permits the rod 52 to rotate freely with respect to the rod 48.
Mounted to the outer end of the tie rod 52 is a rotatable chamber 60 secured to the rod in the illustrated embodiment by means of a screw 62 passing through an opening in the end wall of the chamber and is threaded to the tapped end of the rod 52. A boss 64 is formed at the end of the chamber for reinforcement thereof at the connecting joint.
The chamber 60, in the preferred embodiment, has an ovoidal configuration and is comprised of a pair of separable sections 66 and '68 connected to one another at the center. The chamber sections 66 and 68 are circular in cross section and each is formed with cooperating contoured flanges 70 and 72 which come together to form annular groove 74 adapted to fit over and roll about the track 18. The flanges on either side of the groove extend out for some distance from the chamber walls to encompass the track 18 and to insure that the chamber remains on the track even at high rotational speeds. The chamber halves detachably connect to one another by means of cooperating threads 76 formed at the center line behind the annular groove 74. Other locking arrangements obviously may be provided to permit the chamber to be opened and closed for easy loading and unloading of the charge of material and the grinding medium.
In the illustrated embodiment, the interior walls of the chamber 60 are lined with a stratum 78 of rubber or other resilient material which not only lowers the noise level of the unit in operation but also aids in the grinding action since it enhances the bouncing of loose material within the chamber. The grinding action may be further enhanced by adding abrasive material to the liner 78. The abrasive can be coated over the surface of the resilient liner as by spraying the same together with a binder onto the liner. Also, abrasive inserts may be set into the resilient layer with the outer portions of the inserts either flush with the surface of the liner or protruding therefrom to interact with the charge of material in the chamber. Also, polishing agents may be placed in the chamber either in the form of dry material or suspended in a liquid as best suited for the particular task.
' The hinge mounting of the rod 48 permits the chamber 60 to be raised from the horizontal position illustrated into a vertical or nearly vertical position for loading and unloading purposes. When loading, the chamber is raised to the vertical position, the chamber section 66 is unscrewed from the section 68 and the charge of material as well as the grinding medium are deposited in the raised section 68. The section 66 is then screwed .back into position and the chamber lowered to the horizontal position with the groove 74 placed over the track, the weight of the chamber together with its charge being sufficient frictional force to insure rotation of the chamber as it moves about the track. The chamber not only will rotate but will tilt about its axis by reason of the .cam and follower 40 and 42 and the undulating rail 18.
Furthermore, the chamber will move radially in and out to add another motion component by reason of the flattened configuration of the track. The added motions enhance the polishing and grinding action and speed up the processing on the charge. The operation can be further accelerated by speeding up the motor drive as required.
Having thus described the invention What we claim and desire to obtain by Letters Patent of the United States is:
1. A tumbling mill, comprising: (a) a container adapted to receive a charge of material, (b) an irregularly contoured generally horizontal closed track adapted to support and guide said container, (0) an annular member mounted to said container for rolling engagement with said track, (d) a vertical drive shaft extending centrally through said track, (e) an extensible member connecting said shaft to said container whereby said chamber will be rolled about said track upon rotation of said shaft, and
(f) drive means engaging said shaft.
2. A tumbling mill according to claim 1 including means for axially reciprocating at least a portion of said drive shaft to cause said container to tilt about its axis upon rotation thereof. 7
3. A tumbling mill accordingtolclairn 1 wherein said extensible member is pivoted to .said drive shaft.
4. A tumbling mill according to claim 1 wherein said track is in the form of an undulating flattened circle.
5. A tumbling mill according to claim 1 including a stratum of resilient material over the inner walls of said container.
6. A tumbling mill according to claim 5 including an abrasive medium bonded to said stratum. I
7. A tumbling mill according to claim 1 wherein said extensible member includes a pair of relatively rotatable, spring-loaded elongated members telescopically connected to one another. i
'8. A tumbling mill according to claim 1 wherein said container is of ovoidal configuration comprised of a pair of matching cooperating half-sections detachably connected to one another. 7
References Cited UNITED STATES PATENTS 2,135,839 11/1938 Persons 23325 X 2,961,703 11/ 1960 .Pinotti.
1,895,622 1/1'933 Hannon 5l-,164 X 3,503,157 3/1970 Harper 51-164 HAROLD D. WHITEHEAD, Primary Examiner U.S. Cl. X.R.
US1585A 1970-01-09 1970-01-09 Tumbling mill Expired - Lifetime US3609921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US158570A 1970-01-09 1970-01-09

Publications (1)

Publication Number Publication Date
US3609921A true US3609921A (en) 1971-10-05

Family

ID=21696821

Family Applications (1)

Application Number Title Priority Date Filing Date
US1585A Expired - Lifetime US3609921A (en) 1970-01-09 1970-01-09 Tumbling mill

Country Status (1)

Country Link
US (1) US3609921A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885357A (en) * 1973-11-19 1975-05-27 Harvey C Hoyt Orbital agitating apparatus
US4073095A (en) * 1976-01-21 1978-02-14 Manfrid Dreher Centrifugal drum polishing machine
US4281936A (en) * 1979-11-13 1981-08-04 Red Devil, Inc. Paint mixing and conditioning machine
US4296882A (en) * 1979-02-26 1981-10-27 Terumo Corporation Centrifugal fluid processing device
DK151371B (en) * 1978-09-25 1987-11-30 Sears Roebuck & Co APPLIANCE FOR MIXING VOLUMEABLE MATERIAL IN A CONTAINER
US4789245A (en) * 1988-01-28 1988-12-06 Miller Paint Equipment, Ltd. Disc-type apparatus for mixing paint cans
US4940337A (en) * 1986-06-23 1990-07-10 Toppan Printing Co., Ltd. Apparatus for separating heavy metals from a ferric chloride waste fluid
US5042306A (en) * 1990-03-21 1991-08-27 The United States Of America As Represented By The Department Of Energy Multiple direction vibration fixture
US5268620A (en) * 1991-11-21 1993-12-07 Fluid Management Limited Partnership Mixing apparatus
US5355638A (en) * 1992-09-08 1994-10-18 Hoffman Steve E Traction drive centrifugal finisher
US5443314A (en) * 1993-07-09 1995-08-22 United Coatings, Inc. Mixing assembly
US5462353A (en) * 1994-03-10 1995-10-31 United Coatings, Inc. Shaker with cam operated clamp
US6196712B1 (en) * 1998-08-05 2001-03-06 Elm Gunter Von Bar having an integral cocktail mixer
US6350189B1 (en) * 2000-03-03 2002-02-26 Nippon Dia Industry Co., Ltd. Grinding device
US6850020B1 (en) 2003-09-26 2005-02-01 Red Devil Equipment Company Multizone clamping system for paint mixer
US20160339558A1 (en) * 2015-05-18 2016-11-24 United Technologies Corporation Internal surface finishing apparatus and method
US20190189312A1 (en) * 2017-12-19 2019-06-20 National Cheng Kung University Pretreatment of Thick-Film Aluminum Electrode for Metal Plating

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885357A (en) * 1973-11-19 1975-05-27 Harvey C Hoyt Orbital agitating apparatus
US4073095A (en) * 1976-01-21 1978-02-14 Manfrid Dreher Centrifugal drum polishing machine
DK151371B (en) * 1978-09-25 1987-11-30 Sears Roebuck & Co APPLIANCE FOR MIXING VOLUMEABLE MATERIAL IN A CONTAINER
US4296882A (en) * 1979-02-26 1981-10-27 Terumo Corporation Centrifugal fluid processing device
US4281936A (en) * 1979-11-13 1981-08-04 Red Devil, Inc. Paint mixing and conditioning machine
US4940337A (en) * 1986-06-23 1990-07-10 Toppan Printing Co., Ltd. Apparatus for separating heavy metals from a ferric chloride waste fluid
US4789245A (en) * 1988-01-28 1988-12-06 Miller Paint Equipment, Ltd. Disc-type apparatus for mixing paint cans
WO1989007008A1 (en) * 1988-01-28 1989-08-10 Miller Paint Equipment Ltd. Disc-type apparatus for mixing paint cans
US5042306A (en) * 1990-03-21 1991-08-27 The United States Of America As Represented By The Department Of Energy Multiple direction vibration fixture
US5268620A (en) * 1991-11-21 1993-12-07 Fluid Management Limited Partnership Mixing apparatus
US5355638A (en) * 1992-09-08 1994-10-18 Hoffman Steve E Traction drive centrifugal finisher
US5443314A (en) * 1993-07-09 1995-08-22 United Coatings, Inc. Mixing assembly
US5462353A (en) * 1994-03-10 1995-10-31 United Coatings, Inc. Shaker with cam operated clamp
US6196712B1 (en) * 1998-08-05 2001-03-06 Elm Gunter Von Bar having an integral cocktail mixer
US6350189B1 (en) * 2000-03-03 2002-02-26 Nippon Dia Industry Co., Ltd. Grinding device
US6850020B1 (en) 2003-09-26 2005-02-01 Red Devil Equipment Company Multizone clamping system for paint mixer
US20160339558A1 (en) * 2015-05-18 2016-11-24 United Technologies Corporation Internal surface finishing apparatus and method
US10052738B2 (en) * 2015-05-18 2018-08-21 United Technologies Corporation Internal surface finishing apparatus and method
US20190189312A1 (en) * 2017-12-19 2019-06-20 National Cheng Kung University Pretreatment of Thick-Film Aluminum Electrode for Metal Plating

Similar Documents

Publication Publication Date Title
US3609921A (en) Tumbling mill
US3464163A (en) Vibratory finishing machine
CN108262144B (en) Integrated Chinese medicine intelligence milling apparatus
CN109590832A (en) A kind of highly-safe grinding device
US2809473A (en) Apparatus for smoothing the surfaces of articles
CN106926059A (en) A kind of device and method of automatic grinding spheroidal gem and jade
CN208912199U (en) A kind of newborn wheat flour processing grinding device high in machining efficiency
US2420988A (en) Bowling ball cleaner and polisher
CN207413298U (en) A kind of raw material mixed stirring device of abrasive material
US6080052A (en) Machine for finishing nonmagnetic components
CN108714851B (en) Automatic polishing device for wood products
US1308933A (en) Grinding ob polishing machine
CN109500676A (en) A kind of self-priming wall surface grinding device of architectural decoration
CN112317055A (en) Small-size building material grinder for building engineering
US4452016A (en) Reversing weight for vibrating finishing machines
US3295768A (en) Method of vibratory-milling
CN213616010U (en) Magnetic polishing machine
CN212311725U (en) Low-noise high-speed centrifugal grinding and polishing machine
KR100889201B1 (en) Bowling Ball Surface Treatment Equipment
CN212328487U (en) Sand mill for producing epoxy zinc-rich primer
US3061981A (en) Grinding and polishing machine
CN208451345U (en) A kind of jewellery master alloy Scroll-tupe polishing grinding equipment
US3814335A (en) Vibro-gyratory mills
US3195279A (en) Tumbling barrel and drive therefor
CN208496691U (en) A kind of miniature iron shot polishing machine with shock-absorbing denoising function