US3923255A - Vertical spindle pulverisers - Google Patents

Vertical spindle pulverisers Download PDF

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Publication number
US3923255A
US3923255A US465592A US46559274A US3923255A US 3923255 A US3923255 A US 3923255A US 465592 A US465592 A US 465592A US 46559274 A US46559274 A US 46559274A US 3923255 A US3923255 A US 3923255A
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United States
Prior art keywords
spindle
discs
pulverizer
air
disc
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Expired - Lifetime
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US465592A
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English (en)
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Keith W G Leonard
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B02C7/08—Crushing or disintegrating by disc mills with coaxial discs with vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details

Definitions

  • ABSTRACT A vertical spindle pulveriser including a housing structure in which a spindle, having a grinding disc attached near one end thereof, is vertically and rotatably mounted.
  • a complementary grinding disc is fixed in the structure above the first disc, a compartment is formed in the structure about and below the discs, a receptacle is located below the discs and a feed hopper is provided such that is communicates with a space between the discs.
  • Other air outlets are provided in the pulverizer for cleaning other parts thereof, and these outlets and the axial bore in the spindle are connected to a source of compressed air through a control valve which is automatically activated when the receptacle is removed after a comminuting operation.
  • the present invention relates to vertical spindle pulverisers utilising grinding discs for communicating and pulverising hard materials, particularly ore samples.
  • One vertical spindle pulveriser of known type basi cally comprises a structure housing a vertical rotatable spindle having a grinding disc secured to the end thereof.
  • a complementary grinding disc is fixed in the structure and a chamber is provided about and below the discs embodying a removable dish.
  • a feed hopper communicates with a space between the discs and a fan is attached to the rotatable grinding disc below this disc to create in use, air currents below the dish.
  • the spindle and attached disc are adapted to be moved vertically such that the discs may be brought into contact with each other.
  • a pneumatic piston and cylinder assembly is included in the structure and, furthermore, a handwheel is provided so that the spacing between discs can be adjusted to accomodate wear of the discs.
  • the pulveriser is swept by air under pressure which is directed into the space between the grinding discs and onto the lower, rotatable disc through a circumferentially arranged plurality of jets above the discs.
  • the facing periphery of the discs is cleared by jets of air emitted through to peripheral plurality of jets with outlets between the discs.
  • the feed hopper is swept by air introduced therein which carries dust down through the gap between the discs. All of the dust swept in the above three manners is extracted from the housing through an exhaust outlet connected to evacuating means. in addition, the enclosed space above the space between the discs is swept by evacuatron.
  • a vertical spindle pulveriser comprising a housing structure in which is mounted a vertical rotatable spindle having a grinding disc secured near the lower end thereof, a complementary grinding disc fixed in the structure above the first disc, a chamber about and below the discs and a feed hopper communicating with a space between the discs, characterised in that the pulveriser includes means supplying air under pressure automatically to sweep the interior of the pulveriser, the means comprising an axial central bore through the rotatable vertical spindle, at least one radial outlet through the spindle to emerge facing the upper fixed grinding disc and at least one second radial outlet through the lower end of the rotatable spindle below the discs.
  • the invention also provides a plurality of air outlets near the exterior opening to and inside the feed hopper.
  • the invention provides for some of said outlets to be jet nozzles and for the feed hopper to have an aperture in a side thereof connecting the hopper to a partially evacuated enclosed space above the grinding discs.
  • a vertical spindle pulveriser of the type outlined above comprises a vertical rotatable spindle 1 having a rotatable grinding disc 2 attached near its lower end.
  • the spindle is housed in a structure 3 and a fixed grinding disc 4 is secured in the structure above the rotatable disc 2.
  • a funnel 5 is located in the structure with its wider end encircing the discs 2 and 4 and with its narrow end protruding into a container 6 supported on a base 7.
  • This base is, in turn, pivotally mounted in the structure as at 45 about a horizontal axis and is also mounted on a pneumatic piston and cylinder assembly 8 serving as a ram which maintains the container 6 in close contact with the funnel 5.
  • a spring 44 is provided to bias the base downwardly.
  • the structure 3 includes an upper and a lower compartment 9 and 10 which are divided by a wall 11 to which the fixed grinding disc 4 is removably attached.
  • a continuous space 12 is formed between the grinding discs by a central concave portion in the discs and be tween the spindle l and dividing wall 11.
  • a feed hopper 13 in the form of a chute communicates between this space 12 and the exterior of the pulveriser.
  • the rotatable spindle 1 has an axial bore 14 therethrough which emerges at the lower end of the spindle in two jets 15.
  • a radial passage 16 connects the central bore with the said space 12 between the grinding discs and emerges directed towards the fixed disc 4.
  • a fan 46 is attached near the lower end of the spindle.
  • An air pipe 17 passes through the wall of the compartment 9 and through the dividing wall 11 into the space 12 through an aperture directed downwardly towards the rotatable lower disc 2.
  • a further air pipe 18 communicates with appropriate outlets in the wall 11 such that, in use, air will be directed down the sides of the discs adjacent the top part of the funnel 5.
  • An air jet indicated at 19, is located inside the hopper 13 near the exterior end thereof and the jet is directed substantially down the side walls into the hopper. This jet is formed by a perforation in an air supply pipe.
  • An aperture 20 in the wall of the hopper connects the hopper with the interior of the upper compartment 9 of the pulveriser structure.
  • This compartment and the lower compartment W are connected to pipes 21 which may in turn be connected to evacuating means (not shown).
  • a butterfly or other control valve 22 can be provided to vary the suction applied to the two compartments as desired.
  • the spindle 1 is rotatably mounted in a housing 30 which has a piston 31 adapted to slide vertically in a closed cylinder 32 formed in the structure of the pulverisor.
  • the cylinder In the structure above the cylinder is a socket 33 with the screwed boss 34 of a hand wheel 35 rotatable therein. Hand wheel 35 is rotated to adjust the grinding space between the grinding discs and thereby accomodate disc wear. A lock nut 36 is provided adjacent to hand wheel boss to adjust the spacing between the discs when parted as outlined below.
  • the grinding spindle at the top has a pulley 37 which it is attached by means of a belt or the like to a driving motor 38 fixed to one side of the structure.
  • the piston 31 is adapted to be moved up and down in the cylinder 32 by means of compressed air supplied through pipes 40 to open and close the space between the discs during blowdown and grinding operations respectively.
  • the space is regulated by the hand wheel 35 so that the discs are maintained in proper relation one with the other during communition of the charge.
  • a swivel connector housing 39 encloses the top of the centrally bored spindle and an air pipe 41 communicates with the interior of this housing such that air, under pressure, may be blown down the central bore in the spindle when the latter is rotating.
  • This air pipe, pipes 17, 18 and 40 further air pipes 42 connected to the pneumatic ram 8 are suitably connected to a supply source of compressed air and a blowdown valve 24 and a control valve 43 are provided for the purpose outlined below.
  • the handwheel is rotated until the desired operative distance between the grinding discs is established.
  • Control valve 43 is opened to allow air to pass below the piston and move the discs toward one another and the spindle is rotated by means of the motor.
  • the hard wheel 35 is used to vary and adjust the operative grinding space by which the discs are separated during comminuting. In assaying, the average particle size of comminuted samples may need to be varied and it is operative spacing between the discs which will determine the resulting particle size. Also, the discs become worn with time and the hand wheel allows compensation for wear.
  • the piston and cylinder assembly is included in the pulverizer to move the discs towards and away from each other at the commencement and at the end of a pulverizing operation.
  • the piston 31 moves the discs toward each other until they are spaced apart by the amount determined by the hand wheel setting.
  • the lock-nut 36 determined the distance by which the discs can be moved apart by the piston 31 at the end of a pulverizing operation.
  • the pipes 21 communicating with the compartments 9 and 10 are connected to evacuating means so that a partial vacuum is maintained in these compartments.
  • the pneumatic ram 8 moves the base 7 and container 6 upwardly until the latter is in form abutment with the funnel 5.
  • the sample to be pulverised is introduced into the feed hopper 13 and falls into the space 12 between the grinding discs. Pulverised material is directed by the funnel into the container 6 where it is retained. It is to be appreciated that any dust formed which would normally escape via the feed hopper entrance is sucked through the aperture into the upper compartment 9 and out through the exhaust pipe 21.
  • the discs When the sample is completely ground, the discs are parted by operating the control valve 63 and the pneumatic ram simultaneously lowers the base and container.
  • This container is removed from the lower compartment through an aperture 23 in the compartment and this removal actuates the blow-down valve 24 which in turn activates the cleaning or blow-down system.
  • the valve is preferably activated by an arm 47 pivotally attached to the base such that removal of the dish causes the arm to move and thereby open the valve.
  • Air under pressure is forced through the several apertures and airjets outlined above, and it is to be appreciated that the spindle and rotatable disc continue spinning throughout.
  • the jets l6, and the apertures associated with pipes 17 and 18 direct air onto the upper fixed grinding disc 2, on to the lower spinning grinding disc and around the periphery of the lower and upper discs respectively. Since jet 16 is rotating and since the lower disc continues to rotate, it is obvious that the entire facing surfaces areas of both discs are thoroughly cleaned.
  • the jet 19 ensures that the hopper is well cleaned and dust is blown both through the aperture 20 and down into the lower compartment 10. Air forced through the rotating jets 15 in the end of the spindle clean the walls of the funnel and the dust accumulated in the compartment is extracted through the exhaust pipe 21.
  • Dust from the hopper which accumulates in the upper compartment 9 is extracted through the other exhaust pipe 21.
  • the container 6 may now be replaced which automatically terminates the air supply to the blowdown system and another cycle commenced.
  • the container 6 may not be removed while a grinding operated is in process since the pneumatic ram holds the container against the funnel and the ram is activated when the control valve is opened to move the discs towards each other.
  • Blowdown of the pulveriser occurs automatically on removal of the container and the pulveriser according to the present invention ensures that a strict sequence of operations is adhered to.
  • the formatiotn of jets in the rotating spindle obviates the necessity of having several jets circumferentially arranged in the pulveriser.
  • the general arrangement of air jets as above described ensures that the interior of the pulveriser is thoroughly and efficiently cleaned after each cycle, and harmful dust, which normally escapes from the feed hopper, is extracted through the pulveriser.
  • a vertical spindle pulverizer comprising a housing structure
  • a spindle vertically and rotatably mounted in the structure
  • a removable receptacle located in the structure below said discs and in said compartment;
  • the pulverizer being characterized in that it includes means for supplying air under pressure automatically to sweep the interior of the pulverizer, said means comprising: an axial central bore through said spindle;
  • a source of compressed air connected to said axial central bore in the spindle;
  • valve controlling the supply of compressed air to said axial central bore, the valve being in cooperative relationship with said receptacle such that removal of the latter automatically opens the valve and replacement of said receptacle automaticaliy closes the valve.
  • a vertical spindle pulverizer as claimed in claim 1 in which a plurality of air outlets are mounted in said feed hopper near the exterior opening thereof, said outlets being directed toward the interior of the hopper and being connected through said valve to said source of compressed air.
  • a vertical spindle pulverizer as claimed in claim 1 in which said air supplying means includes an air outlet mounted above said first and second discs and directed in downward communication with said central aperture in said second disc to direct air through said central aperture in the second disc onto a central concave portion of the first grinding disc, said air outlet being connected through said valve to the source of compressed air.
  • a vertical spindle pulverizer as claimed in claim 1 in which further means are provided for moving the discs toward and away from each other.
  • a vertical spindle pulverizer as claimed in claim 5 in which said further means comprises a double acting pneumatic piston and cylinder assembly, the piston being provided on a housing for the rotatable spindle and the cylinder being formed in the pulverizer structure surrounding the piston.
  • a vertical spindle pulverizer as claimed in claim 1 in which said feed hopper has an aperture in a side thereof connecting the interior of the hopper to an enclosed space in the pulverizer structure above said grinding discs and said compartment, said space being connected by means of piping to evacuating means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
US465592A 1973-07-03 1974-04-30 Vertical spindle pulverisers Expired - Lifetime US3923255A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA734492A ZA734492B (en) 1973-07-03 1973-07-03 Improvements in vertical spindle pulverisers

Publications (1)

Publication Number Publication Date
US3923255A true US3923255A (en) 1975-12-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US465592A Expired - Lifetime US3923255A (en) 1973-07-03 1974-04-30 Vertical spindle pulverisers

Country Status (5)

Country Link
US (1) US3923255A (fr)
AU (1) AU465291B2 (fr)
CA (1) CA1017311A (fr)
GB (1) GB1419726A (fr)
ZA (1) ZA734492B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913358A (en) * 1987-06-12 1990-04-03 Maschinenfabrik Andritz Actiegesellshaft Mixer for pulp and bleaching chemicals
US20040155127A1 (en) * 2003-02-07 2004-08-12 King Machine And Tool Co. Disc mill assembly for pulverizing system
JP2014083516A (ja) * 2012-10-25 2014-05-12 Kubota Corp 製粉機
CN116422438A (zh) * 2023-04-25 2023-07-14 连云港班庄水泥有限责任公司 一种高速公路路基缓凝水泥制备装置与方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104174474A (zh) * 2014-08-15 2014-12-03 湖南三德科技股份有限公司 具有回风通道的制样粉碎机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US291018A (en) * 1884-01-01 Eollee geinding mill
US2626757A (en) * 1949-01-22 1953-01-27 Allis Chalmers Mfg Co Attrition mill
US2846155A (en) * 1954-04-01 1958-08-05 Higer Harry Refuse disposal apparatus
US3840191A (en) * 1972-04-15 1974-10-08 G Herzog Vibrating plate mill for batch operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US291018A (en) * 1884-01-01 Eollee geinding mill
US2626757A (en) * 1949-01-22 1953-01-27 Allis Chalmers Mfg Co Attrition mill
US2846155A (en) * 1954-04-01 1958-08-05 Higer Harry Refuse disposal apparatus
US3840191A (en) * 1972-04-15 1974-10-08 G Herzog Vibrating plate mill for batch operation

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913358A (en) * 1987-06-12 1990-04-03 Maschinenfabrik Andritz Actiegesellshaft Mixer for pulp and bleaching chemicals
US20040155127A1 (en) * 2003-02-07 2004-08-12 King Machine And Tool Co. Disc mill assembly for pulverizing system
US7152823B2 (en) 2003-02-07 2006-12-26 King Machine And Tool Co. Disc mill assembly for pulverizing system
US20070080250A1 (en) * 2003-02-07 2007-04-12 King Machine And Tool Co. Disc mill assembly for pulverizing system
US7699255B2 (en) 2003-02-07 2010-04-20 King Machine And Tool Co. Disc mill assembly for pulverizing system
JP2014083516A (ja) * 2012-10-25 2014-05-12 Kubota Corp 製粉機
CN116422438A (zh) * 2023-04-25 2023-07-14 连云港班庄水泥有限责任公司 一种高速公路路基缓凝水泥制备装置与方法
CN116422438B (zh) * 2023-04-25 2023-09-08 连云港班庄水泥有限责任公司 一种高速公路路基缓凝水泥制备装置与方法

Also Published As

Publication number Publication date
AU6864074A (en) 1975-09-25
CA1017311A (fr) 1977-09-13
AU465291B2 (en) 1975-09-25
ZA734492B (en) 1974-06-26
GB1419726A (en) 1975-12-31

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