US3697136A - Drive sprocket for wide chain of drum cutting head - Google Patents
Drive sprocket for wide chain of drum cutting head Download PDFInfo
- Publication number
- US3697136A US3697136A US115965A US3697136DA US3697136A US 3697136 A US3697136 A US 3697136A US 115965 A US115965 A US 115965A US 3697136D A US3697136D A US 3697136DA US 3697136 A US3697136 A US 3697136A
- Authority
- US
- United States
- Prior art keywords
- cutter
- chain
- head
- specified
- drive sprocket
- 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
Links
- 238000005065 mining Methods 0.000 claims abstract description 18
- 125000006850 spacer group Chemical group 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
Definitions
- ABSTRACT A mining machine cutting structure consisting of a sin- C(ii "299/13i g centrally located cutter Suppomng chain and 5 i 4 cutter supporting rotary elements extending outwardly from the sides of the cutter supporting chain.
- a disintegrating head mechanism or cutting structure is used to dislodge mineral from a mine vein and is operable to provide a mine passageway or room into which the apparatus advances as mining progresses.
- the disintegrating head mechanism is pivotally mounted on a mobile base to swing in a vertical plane between the mine roof and floor and includes a rotary drum cutting head assembly arranged on a horizontal transverse axis and having teeth or bits which tear away and dislodge the mineral.
- the apparatus also includes a conventional loading head for gathering the loose mineral on the mine floor and moving it rearwardly and inwardly toward the forward receiving portion of the conveying means of the apparatus.
- the rotary drum cutting head assembly has end portions thereof which can be selectively extended or retracted to, respectively, dislodge mineral from the ribs and corners of a mine passageway and reduce the effective length of the cutting head assembly to provide clearance at the sides of the assembly.
- the present invention contemplates improvements over such known types of mining apparatus, for example; an improved rotary drum cutter head assembly configuration which allows the use of a centrally located relatively wide endless circulating cutter chain; and chain support surfaces on the drum head portions.
- FIG. 1 is a perspective view of a mining machine embodying the principles of this invention
- FIG. 2 is an enlarged view, partly in section, taken on line 2-2 of FIG. 1 and showing a main gear casing and a portion of the cutter head assembly embodying the principles of this invention.
- a continuous mining machine generally designated at 10 which embodies the principles of this invention, may assume various forms but, for illustrative purposes, herein comprises a crawler base 14 carrying a frame 16 on which a forwardly extending mining boom 18 is pivotally mounted at the forward end of the frame 16 to swing up and down between a mine roof and a mine floor.
- a cutting head assembly 24 extends transversely A of boom 18 and is rotatably secured thereto at the forward end thereof.
- Pivotably mounted at the forward end of frame 16 and extending forwardly therefrom beneath the boom 18 is a conventional loading head 26 having oscillatory gathering arms 28 for engaging mined mineral and moving such mineral rearwardly and inwardly toward well known conveying means 30 of the mining machine 10.
- Conventional fluid jacks serve to swing the boom 18 in a vertical plane about the pivot axis thereof and the loading head 26 is tilted about the horizontal axis thereof by other fluid jacks.
- the fluid jacks have one end of each secured to the forward end of frame 16 and have the other ends thereof secured to respective rearward lever ends of boom 18 and loading head 26.
- the cutting head assembly 24 is driven from motors 36, which are suitably rigidly secured by brackets to boom 18.
- the drive from motors 36 is delivered through speed reducing transmissions to a pair of universal drive shafts 42.
- the discussion hereinafter will refer to the drive train from a single drive shaft 42.
- drive shaft 42 is suitably connected by shafts and bevel gears to a shaft 52 which extends transversely inward of machine 10 and is suitably rotatably supported by a bevel gear casing 54 mounted on the boom 18.
- Bevel gear casing 54 is suitably secured to a side portion of a main gear casing 56.
- Casing 56 is contained within a forward area of boom 18 and is securely fastened to the inner sides thereof in any suitable manner.
- the shaft 52 has a spur gear 58 at the inner end thereof which is drivingly connected through a series of gears with a reduction gear 68 in driving engagement with a splined portion of a cutting head assembly drive shaft 70.
- Shaft 70 extends through gear 68 in a transverse direction with relation to the longitudinal axis of mining machine 10. Gears 58-68 and a portion of shaft 70 are captively and rotatably received by gear casing 56.
- Shaft 70 is rotatably supported by tubular gear casing extensions 72 which extend outwardly [i.e. transversely from the centerline of machine 10 from a forward portion 74 of gear casing 56.
- shaft 70 rotatably drives: an endless circulating belt type continuous hinge cutter chain 76 which has a width thereof approximately equal to a transverse measurement of a forwardly extending casing portion 74 taken at the forward end thereof; hollow cylindrical rotary drum cutting heads 78 which extend outwardly away from respective sides of portion 74; and hollow cylindrical rotary drum cutting head extensions 80 [see FIG. 1] which are slidably partially received within respective heads 78 and are selectively hydraulically extendable outwardly therefrom.
- a cutter chain drive sprocket 82 is in splined engagement with shaft 70.
- Drive sprocket 82 has a plurality of teeth 84 around the outer periphery thereof which drivably engage the cutter chain 76 as hereinafter described.
- a suitable rear idler sprocket 86 which is rotatable on a shaft 88 and extends transversely of the forward boom area, provides well known tensioning and motion reversing means for the cutter chain 76 to form a continuous orbital path therefor.
- Spacer sleeves 90 are positioned along shaft 70 intermediate sprocket 82 and adjacent gears 68 so as to maintain a spaced relationship between sprocket 82 and gears 68.
- spacer sleeves 92 are positioned along shaft 70 to provide a spaced relationship between gears 68 and roller bearings 94 which additionally surround shaft 70.
- Roller bearings 94 provide a rotational relationship between the main gear casing 56 and shaft 70 inwardly adjacent the outer ends of casing extension portions 72.
- a spacer sleeve 96 is positioned along shaft 70 outwardly adjacent the bearings 94.
- spacer sleeve 96 The outer diameter of spacer sleeve 96 is less than the outer diameter of bearing 94.
- Annular drive shaft keepers 98 which are rigidly secured to the outer ends of casing extension portions 72 and project radially inwardly from the inner periphery thereof, have the inner surfaces thereof in rotatable contact with the outer surface of spacer sleeves 96.
- lock nuts 104 are threadably received on shaft 70.
- lock nuts 104 are positioned around shaft 70 and tightened into bearing against sleeves 100 at the outer surface thereof: engaging sleeves 100; spacer sleeves 90, 92 and 96, roller bearings 94; and drive sprocket 82 are releasably secured with respect to shaft 70 thereby preventing any motion thereof in the axial direction.
- Transverse movement of shaft 70 with respect to machine 10 is prevented by lock nuts 104 transferring thrust from shaft 70 through the sleeves 100 and the remainder of the cutter heads 78 to the bearings 102.
- Each rotary drum cutting head 78 has a radially outwardly extending flange 106 at the inner ends thereof and a reduced diameter portion thereof forms a chain end supporting seat 108 which extends axially from flange 106 toward the centerline of machine 10.
- Seats 108 extend under a portion of the outer edges of the endless circulating cutter chain 76 and with such a location act to support the bight portion of the cutter chain 76 at the edges thereof where it is trained about the rotary drum cutting heads 78.
- the relative rotational speeds of the cutter chain 76 and the seats 108 are equal and therefore there is no movement of cutter chain 76 with respect to the seats 108 during the time chain 76 is supported by seats 108. Because of this lack of relative movement there is no wearing between the respective contact surfaces of seats 108 and chain 76.
- the cutter chain drive sprocket 82 is dimensioned to provide root surfaces 1 10 thereof which lie in approximately the same cylindrical surface as the contact surfaces of the spaced seats 108. With such root surfaces 110, each link in the bight portion of chain 76 is sup ported at three areas, namely: end supports at the contact surfaces of the spaced seats 108; and a central support at a root surface 110 of the drive sprocket 82. With such a support arrangement the deflection of chain 76 is minimized and the maximum bending moment due to cutting loads is reduced over that deflection and bending moment which would develop under the same loading if the chain 76 had only one or two areas of support.
- This support arrangement allows the use of cutter chains having a greater chain width to pitch length ratio than previously permitted, for example a chain width to pitch length ratio of four to one, or more.
- a large width to length ratio permits the construction of a chain width large enough for the purposes of this invention, i.e. to cut clearance for casing portion 74, while maintaining a sufficient flexibility to avoid unreasonably large chain drive sprocket diameters. If the chain width to pitch length ratio is less than four to one, the required chain width would yield a pitch length requiring sprockets too large to be used in a cutter head such as hereinbefore described.
- the cutter chain 76 may be of any suitable construction which incorporates hingedly connected links and is adapted to be driven by a central drive sprocket, as for example that cutter chain shown and illustrated in US. Pat. application No. 786,649, filed Dec. 24, 1968 and assigned to the same assignee as is this invention.
- cutter chains designed according to the principles of this invention can be used on mining machines of a type other than the rotary drum mining machine 10 hereinbefore described, for example one or two of such chains can replace the multiple cutter chains of a ripper bar miner of the type illustrated in US. Pat. No. 2,650,813.
- a cutter head for a mining machine consisting of a pair of axially elongated cutter carrying coaxial drum elements mounted on a common head shaft with an axial space therebetween: a single cutter chain drive sprocket drivingly mounted centrally on said head shaft in said space, said sprocket having teeth only on a central peripheral portion thereof axially spaced from said drum elements and being adapted to drive a cutter chain covering said space.
- a cutter head as specified in claim 1 wherein said drive sprocket has tooth portions thereon separated by root surfaces therebetween; adjacent end portions of said drum elements have arcuate chain support contact surfaces thereon; and said contact surfaces lie in approximately the same cylindrical surface as said root surfaces to provide laterally spaced three point support for such a chain.
- a cutter assembly for a mining machine comprising the cutter head specified in claim 3 combined with an endless orbitable cutter chain having a chain width to pitch length ratio of at least four to one.
- cutter assembly as specified in claim 4 wherein said cutter chain is formed of hingedly connected links and each link in turn is simultaneously supported at said laterally spaced three points through a portion of the orbit of said chain.
- the cutter assembly as specified in claim 4 additionally comprising an idler sprocket rotatable on an axis laterally spaced from and parallel to the axis of rotation of said drive sprocket said chain being trained about both of said sprockets in a substantially eliptical shape.
- a cutter head as specified in claim 8 wherein there are two of said spacer elements with a drive gear between mounted on said head shaft on each side of said drive sprocket.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11596571A | 1971-02-17 | 1971-02-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3697136A true US3697136A (en) | 1972-10-10 |
Family
ID=22364418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US115965A Expired - Lifetime US3697136A (en) | 1971-02-17 | 1971-02-17 | Drive sprocket for wide chain of drum cutting head |
Country Status (1)
Country | Link |
---|---|
US (1) | US3697136A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1446292A (en) * | 1922-03-20 | 1923-02-20 | Buckeye Tractor Ditcher Compan | Tread belt for apron wheels |
US2650812A (en) * | 1949-03-29 | 1953-09-01 | Joy Mfg Co | Disintegrating and conveying chain |
US2676005A (en) * | 1949-03-29 | 1954-04-20 | Joy Mfg Co | Disintegrating and gathering chain |
US3305273A (en) * | 1964-04-24 | 1967-02-21 | Galion Jeffrey Mfg Co | Mining apparatus supporting and driving construction |
-
1971
- 1971-02-17 US US115965A patent/US3697136A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1446292A (en) * | 1922-03-20 | 1923-02-20 | Buckeye Tractor Ditcher Compan | Tread belt for apron wheels |
US2650812A (en) * | 1949-03-29 | 1953-09-01 | Joy Mfg Co | Disintegrating and conveying chain |
US2676005A (en) * | 1949-03-29 | 1954-04-20 | Joy Mfg Co | Disintegrating and gathering chain |
US3305273A (en) * | 1964-04-24 | 1967-02-21 | Galion Jeffrey Mfg Co | Mining apparatus supporting and driving construction |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: JOY TECHNOLOGIES INC., A CORP. OF DE.,PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004880/0430 Effective date: 19870529 Owner name: JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004880/0430 Effective date: 19870529 |
|
AS | Assignment |
Owner name: JOY TECHNOLOGIES INC., PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004747/0261 Effective date: 19870626 Owner name: CITIBANK, N.A.,NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURGH, PA 15219, A DE CORP.;REEL/FRAME:004846/0025 Effective date: 19870626 Owner name: CITIBANK, N.A., 641 LEXINGTON AVENUE, NEW YORK, NE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURGH, PA 15219, A DE CORP.;REEL/FRAME:004846/0025 Effective date: 19870626 Owner name: JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004747/0261 Effective date: 19870626 |
|
AS | Assignment |
Owner name: JOY MANUFACTURING COMPANY,STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY TECHNOLOGIES INCL., (A DE CORP.);REEL/FRAME:004827/0367 Effective date: 19870626 Owner name: JOY MANUFACTURING COMPANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE DATE;ASSIGNOR:JOY TECHNOLOGIES INCL., (A DE CORP.);REEL/FRAME:004827/0367 Effective date: 19870626 |
|
AS | Assignment |
Owner name: CITIBANK, N.A., 641 LEXINGTON AVENUE, NEW YORK, NE Free format text: SECURITY INTEREST;ASSIGNOR:JOY TECHNOLOGIES INC.,;REEL/FRAME:004936/0730 Effective date: 19870626 |
|
AS | Assignment |
Owner name: JOY TECHNOLOGIES INC., A CORP OF DE, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:MC CARTNEY, DEREK L.;ARCHIBALD, JOHN H.;REEL/FRAME:005237/0152 Effective date: 19870626 |
|
AS | Assignment |
Owner name: JOY TECHNOLOGIES, INC., A CORP OF DE Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITIBANK N.A.;REEL/FRAME:005237/0187 Effective date: 19891011 |
|
AS | Assignment |
Owner name: CONNECTICUT NATIONAL BANK, THE, CONNECTICUT Free format text: SECURITY INTEREST;ASSIGNOR:JOY TECHNOLOGIES INC., A DE CORP.;REEL/FRAME:005173/0843 Effective date: 19891012 |