CA1064060A - Percussive tool mount - Google Patents
Percussive tool mountInfo
- Publication number
- CA1064060A CA1064060A CA282,275A CA282275A CA1064060A CA 1064060 A CA1064060 A CA 1064060A CA 282275 A CA282275 A CA 282275A CA 1064060 A CA1064060 A CA 1064060A
- Authority
- CA
- Canada
- Prior art keywords
- tool
- mounting arrangement
- axis
- mount
- transmission device
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 230000003116 impacting effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 description 15
- 230000035939 shock Effects 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 241000347881 Kadua laxiflora Species 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 241000582342 Carria Species 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C31/00—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam
- E21C31/02—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam for cutting or breaking-down devices
-
- 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
- E21C27/28—Mineral freed by means not involving slitting by percussive drills with breaking-down means, e.g. wedge-shaped tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/106—Making by using boring or cutting machines with percussive tools, e.g. pick-hammers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1086—Drives or transmissions specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Earth Drilling (AREA)
- Shovels (AREA)
- Braking Arrangements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A mounting arrangement for a material working tool, wherein a rotary drive transmission device of the arrangement is associated with selectively operable locating means for protecting a part or parts of the device against transmitted forces in operation of a said tool.
A mounting arrangement for a material working tool, wherein a rotary drive transmission device of the arrangement is associated with selectively operable locating means for protecting a part or parts of the device against transmitted forces in operation of a said tool.
Description
The invention relates ~o the mounting of material working tools~ such as percussive toolsJ to mounted tools themselves and to systems or machines utilising such toolsJ
and has particular J but not exclusive, reference to mining operations utilising a manipulable impact type mi~eral winning head.
It is often desired to MOUnt a percussive toolJ such as a mineral winning head of a mining ~achineJ on a linkage or boom by which it can be manipulated relative ~o material, such as a mineral aceJ to be worked. Power-operated linkages of a type affording substantially universal movement in a confined space are disclosed in our co-pending Applica~ion No. 279J755.
AnotherJ and perhaps relatively simple, ~ype of mount is a boom-like arrangement as disclosed in our Patent No. 969530 in con-nection with a walking type rock breaker intended primarily for driving headings into a mineral face. Both o thess types of mounts have in common a requirement that an impact type tool be mounted for rotation at the end o~ the linkage or boom concernedg and this, in turn, imposes a requirement for the actual rotational mounting, including in particular its drive transmission means, to be capabla of withstanding impact shocks that will inevitably be transmitted thereto by operation o the tool. This latter requirement can be particularly difficult to meet where~
as with the universally manipulable linkages of our Application No. 279755, it is intended ~hat the impact tool ", :
: ~, . : - . - . . . ~ . , . , , , : . .
.; . ,. , , . .. :
; -. . . .. .:: .: . .. . : .
- ~. . ~ ., , , ~ , : : .
head and the linkages occupy a minimum space, when the use envisaged herein of a compart gearing arrangement between a drive motor and the mineral tool head, such as an epicycllc type gear~ may be particularly susceptible to shock and present great problems in protection therefrom.
Similar problems may arise with other types of tool say off-centre loaded grinders or cutters, wher~ shock forces and/or eccentric or other~ise asymmetric loadings may have to be withstood by a mounting arrangement. ~ :
It is an object of this invention to provide9 in or for a percussive tool~ a rotation permltting mount that will allow the use of a compact ~ear box, for example of epicyclic type, in the ro~ational driYe to an impact type tool, or a boom or part of a mounting linkage ~herefore~
A general aspect of the invention concerns a material working tool having a first axis of working operation and .; , .
~ a second axis about which the tool is rotatable for ~ posltioning purposes relati~e to material being worked, ':! the second axis being transverse of the first axis, the tool comprising a body housing drive means for its working operation along said firs~ axis9 and a mount for said body which mount includes a rotary transmisslon de~ice rom separate dri~e means for rotating said tool body about said second axis~ the de~ice being in a relatively massi~e mount part, an o~ltpu~ part of said transmission device with a coupling to said tool body to serve and so ro~ate ~l said tool body~ and clamp means located at and operate on `~ said output part to secure that output~part against :;, :. .
. ~ .
`; ~ 3 _ :~
movement relative to said relatively massive mount part during material working operation of said tool in - protecting other parts of said transmission device against forces transmitted to said body in working operation of S said tool along said first axis~
In one embodiment of the invention there is provided a percussive tool mount including a drive trans~ission device by which rotation is to be imparted to the tool : relative to a mounting linkage or boom, or to such a boom or link2ge or part thereof~ and selectively operable clamping, gripping or locating means for securely locating at least i~pact or other transmitted force susceptible part or parts of the said device in operation of the ~ool~
` and preferably relative to the said mounting link or ~ 15 boomO Other aspects of this invention concern tools ; incorporating such a mount, and/or machines9 such as mining machines~ utilising such a tool _ _ 3a ~
: -.
:~:
;. .
., .
, The clamping means may be operable relative to, and preferably directly on, a casing of the gear system, and to this end may inc~ude separate but simultaneously operable clamps spaced about the axis of rotation and the peripher~
5. of the gear system casing.
In one embodiment of the invention utilising an epicyclic gear box immediately adjacent to an impact tool head~
: individual pressure-fluid-operated braking elements are intercoupled for simultaneous operation and are interlocked at 10. least with percussive operation of the tool so as to be actuated into clamping action for the duration of percussive or impacting actionO Such braking elements may be additionall~
I or alternatively interlocked with the application of ~, rotational drive to the gear box for repositioning of the .~ 150 percussive tool by rotation so as to be actuated into their ¦ clamping state except when such rotational drive is applied~
Tne braking elements may conveniently include hydraulically operated pistons supplied from the same source as a hydraulic ` motor for appli.cation of said rotational drive and/or operation . 200 of said percussive tool.
As indicated above, in modificatiorLs of such an embodi_ent of the in~entiont the gear box may actuate an intermediate linkage to the tool which may be of substantial length, and may even be applied at the opposite end of a mounting linkage 25. or boom to that at which the tool head itself is located.
One embodiment of the invention will now be specifically . descri.bedl by way of example, with reference to the l accompanying drawings, in which:--.~ Figure 1 is a sectional view through an impact type mi ning head mount;
,:
~ 4 ::, ,, ,.: , : . , :' . . . ':
Fi~ rG - is a par~ially detalled cross-section of the moll~t o~` ~' g~lre 1 showing details of one cla-llping Tnearls;
~ i~ure 3 is a dr~tailed further sectional view of the clal~iping means of ~igure 2; and 5. ~;g~ure ~ is a diagram o a sui-table electro-hydraulic control system.
In the drawings, a manipulator arm or boom 10 has an inte~ral or otherwise rigidly secllred head 11 with a central transverse bore 12 for holsin~ a rnount for an 10. impact type mineral winning head 13 that is to be rotatable in the bore 120 ~o this end, it is pro~ided with or secured relative to a hollow shaft or open ended casing 14 that fits within the b~re 12 and has spaced peripheral bearing surfaces 15 for cooperating with matchingly 15. disposed bearing surfaces 16 ~n the interior of the bore 12. Externally of the head 11 at the impact head side9 the shalt or casing 14 has a flan,e 17 with an annular bearing surface 18 cooperating with a bearing surface 19 on the head 11.
20. . ~he shaft or casing 14 forms the exterior element of an epic~clic gear box and has a shor-t central shaf-t 21 keyed thereto at 22 and to a planet gear carrier 23 journalled in a s-ta-tionary element 24 of the epicyclic ~ gear box.
.~ 25. ~he stationary elemen-t 24 is a bell-like member with a bearing 25 in an aperture 26 through its crown for a neck part of theplanet wheel carrier 23 which has a f1ange part 26 carr~ing an axle or stub shaft 27 for a toothed planet gear wheel 28. ~he gear wheel 28 meshes with a toothed ring gear 29 fixed to the ;.nterior ; - 5 '~ .', , '. . ,. . , ' ... ' . ': , ., ~ , ,' ' . ' ' , ' ~ ' . ' . . ' . , of the stationary element ~4, and also with a central toothed shaft 31 or a gear wheel therein axially aligned with the sha~t 21.
The shaft 31 has an extension 32 with an axial splined bore 33 for receiving a drive shaft 34 of a suitable drive motor 35, for example a hydraulic mo~or. The extension 32 is journalled externally at 38 in a boom head ~losure plate 39 which is indicated generally at 41 as being secured both to the motor casing and a flange 42 of the bell-like stationary member ~4.
This type of epicyclic gear box is a particul~rly , compact structure, as can be seen from its being housed wholly within the boom head 11, but requires protection agalnst the o~ten very severe impact shocks from a typical percussive mining head, say of the type to which our patent No. 937835 relates. It is therefore proposed herein that the shaft or casing 14 be clamped relative to the comparatively moving head 11 at least during operation ."
of the mining head.
In order to achieve such clamping, the shaft or casing 14 is provided with a central peripheral recess 45 which is shown as having a chamfered side wall and a flat base for cooperating with a correspondingly shaped brake pad elements 46 mounted in bores through the side walls of ~he head 11. In the particular example illustratedi the head ll is of generally octagonal shape a~ its exterior ~ surace and has four such brake elemen~s at diametrically :~, ::
: ~, . ~: . . . .
~ - : . . . : . . .
:.:
, . - , .
opposed faces~ through bores disposed centrally thereo~ and indicated generally by bore axes 47~ ~hese bore~ 47 ha~e an inner portion conforming to th~ brake beari~g pads, an intermediate portion 49 of the greater diameter 5. and an external portion 51 of ~till greater diameter as defined by the annular steps 52 and 53. ~hese i~termediate and outer portions of the bores serve to house and locate flanged brake cylinders 54 and cylinde:r cover plates 55.
The cover plate 55 shown in ~igure 2 has an inwardly 10. extending central dome cooperating with a dished brake actuator piston 56 mounted in sealing arrangement therein.
~he fl~nges of the brake actuator pistons are shown as forming with a rim of the cover plate inlets 60 for hyd~aulic fluid from passageways 61 formed in the head 11 15. for common s~pply of hydraulic actuating fluid ~rom port 62 to ensure that all o~ the brake pistons are operated at the same time so as to symmetrically lock or ~lamp the shaf~ or casing 140 ~his will ensure that~ after repositioning of the tilt angle of the mining head while . 20~ the brake cylinders are unpres~urised, subsequent pressurisation thereof will cause the entire epicyclic gear box assembl~ to be protected against the effects o~
impact shocks. In this respect attention is drawn to the cooperatingly formed mating surfaces at the mouth of the bell-like statisnary member 24 and the ~ha~t or casing 140 I~ Fi~ure ~ special treatment~ such as stelliting9 o~ brake shoe and its ~ating surface is indicated at 65 and the brake piston retaining circlip is referenced 660 In practice, the same supply of hydraulic fluid may be applied both to actuation of the braking units and to operation of the mining head, so that accidental damage through impact shocks is avoided. Alternatively, of course, an interlock may be provided between two 5- separate systems, one for energising the brake s~stem and the other for driving the mining head~ It ma~ be further preferred to have the brake actuator pi.stons unpressurised only when adJustment of the tilt of the mining head is required~ so a3 to avoid the possibility of the mining 10~ head twisting under its own weight about the gear box axis when not actually being used for mining operation~
In this case, it may be preferred for pressure-fluicl . for the braking system to be a separate supply9 so that . it will operate even in the event of failure of the main 15. mining head supply system, and/or to be interlocked to an accumulator in the mining head supply~
~ ~he particular embodiment described has been assumed .~ to be hydraulically driven, however pneumatic drive i9 . . equally possible, and the drive motor 35 ma~ be of any 20~ suitable type~ for example electric, if the conditions of ~ use allow.
.~ Various modifications are, of course, possible, for example in relation to positioning and feeding operating fluid through it is preferred that ~he brake units be ~' 25~ symmetrically disposed about the gear box axis, : - whatever number are used. ~he shaps o~ the boom head 11 ~ is also capable o~ variation and a mining head may be ; 8 ,,.,~ .
", .
: .. :
.. : . : -mounted on a carria~e secured to th~ shaft or casing 14 for rotation, the head itself being slidable in that carriage. As has been mentioned above embodiments of th~
inven~ion are particularly applicable to min:ing heads or other percussive tools utilising a tool drive hammer actuator piston that is driven on its impact:ing stroke by pressurised fluid that is compressed during a preferably hydraulically powered retraction stroke of that piston and ~ refe~ence is directed to patent specification no. 93/835 .~ lO for further information.
It is also preferred that embodiments of this invention be applied to manipulable tool mounting linkages specifically - for mining heads, as referred to in application no. 279755 to which reference is also directed for further inormation.
; One suitable ~lectro-hydraulic control system is shown in Figure 4~ where the brake uni$ and hydraulic head rotation ~otor are sho~n diagrammatically at 70 and 71 and the percussive head at 72. Hydraulic pressure and return lines 739 74 are shown connected to a motor direction control 20 valve 75 and a brake deactivation valve 75. Valve 75 is solenoid-opera~ed be~ween direction reversing positions via solenoids 77, 76 over elec~rical lines 79, 8Q, respectively, :~ from a swi~ch 81~ preferably of joy stick type with a three-arm csntact maker 82 spring loaded to a non-contact-making state. Valve 76 is also solenoid-operable from a : ' bi~ssed rest state as shown via solenoid 83 and electrical line 84 from the switeh 81~ specifically fro~ either of two .:
? _ g _ ,` .,.
- ~ . . :, . - , -: :. :: . - ... ; ' ,.
~ontacts 85, 86 thereoî :mad~ on different direckion~ of mo~or rotatio~ by E3~m8 87, 88 of the contact me~ber 82.
When in itB rest state, valve 76 CQllneCtS bra:~¢h 89 of the pre~sure line ?3 to h~srdraulic lix~e 90 to power the brake unit ~o. When ~olenoid-operated9 ~r~lve 76 connect~ lirLe 90 . to dra:in line j74 to release the brak~ ~it 70 and allow .~ operation of motor ~1 due to pilo~operated valve 9'1 operated via pilot piston 92 over branch line 9~ from hydraulic line goO In its pilo~operated state v~lve 9~1 iB sho~m bridging 10. hydraulic line~ 94 a~a 95 from valve 75. Valve 91 has a biassed rest sta~e, assumed whe~ the pilot line 9~ is unpressurised~ where the lines 94 ~nd ~35 Are coImected to ! drive the motor 71 in a direction dependin~ o~ which of lines ¦ g4 and 95 18 pressurised accordi~g to the state of valve 75 15D It ~hould therefore be apparent that the brake unit , .~ 70 will be released only whe~ valve 76 ~s operated b~
I energisation of its solenoid drivs on operation of switch ~1 ;¦ to select a direction of motor drive. Also~ it is only then .~ that the pilot line 9~ will be unpressurised to allow valve 20~ to assume ita motor ~ri~e permitting state~
¦ A ~ormally open v~lve 96 is also shown in branch 97 provided from pressure l~ne 7.3 to drive percussive operation . of the hammer 7~ This valve 96 is shown at98 a~ beiQg solenoid~operated over branc~ 99 from electrical line ~4 . 5~
to clo~e only when the brake un~t control valve 76 i energised to release ~he brake unit, ~o that impacting of the hammer72 is prevented when the ~rake uni~ i8 released~
:, .
l - 10 .
`:
I It ~ll b~ ~ppreciated that the particular arrangeme~t , illustrated could be modified by havi~g the ~ralYe 96 ! h~draulic~lly operated via a pilot, by the ~alve 9~ being ~ole~oid operated, or by omitti~l~; valve 96 and h~ g the 5c~ hammar 72 driven from the line 90. ,~ O9 o:3~ cour~e~ the valve 91 need :llot bridge the li~e~ 5 wh~ pilot operated, but cou~d simply block them9 i~,ei. be o~ llo~mally orf ~ype ~.
. ! .
1' ' , .
~1 ,,'i ' . ' .
; !
"j, .,,~, ~ ' ' '.
.' ~ . ',.
1: ~ 11 -'.'' ~ ' . :: ' . ' '
and has particular J but not exclusive, reference to mining operations utilising a manipulable impact type mi~eral winning head.
It is often desired to MOUnt a percussive toolJ such as a mineral winning head of a mining ~achineJ on a linkage or boom by which it can be manipulated relative ~o material, such as a mineral aceJ to be worked. Power-operated linkages of a type affording substantially universal movement in a confined space are disclosed in our co-pending Applica~ion No. 279J755.
AnotherJ and perhaps relatively simple, ~ype of mount is a boom-like arrangement as disclosed in our Patent No. 969530 in con-nection with a walking type rock breaker intended primarily for driving headings into a mineral face. Both o thess types of mounts have in common a requirement that an impact type tool be mounted for rotation at the end o~ the linkage or boom concernedg and this, in turn, imposes a requirement for the actual rotational mounting, including in particular its drive transmission means, to be capabla of withstanding impact shocks that will inevitably be transmitted thereto by operation o the tool. This latter requirement can be particularly difficult to meet where~
as with the universally manipulable linkages of our Application No. 279755, it is intended ~hat the impact tool ", :
: ~, . : - . - . . . ~ . , . , , , : . .
.; . ,. , , . .. :
; -. . . .. .:: .: . .. . : .
- ~. . ~ ., , , ~ , : : .
head and the linkages occupy a minimum space, when the use envisaged herein of a compart gearing arrangement between a drive motor and the mineral tool head, such as an epicycllc type gear~ may be particularly susceptible to shock and present great problems in protection therefrom.
Similar problems may arise with other types of tool say off-centre loaded grinders or cutters, wher~ shock forces and/or eccentric or other~ise asymmetric loadings may have to be withstood by a mounting arrangement. ~ :
It is an object of this invention to provide9 in or for a percussive tool~ a rotation permltting mount that will allow the use of a compact ~ear box, for example of epicyclic type, in the ro~ational driYe to an impact type tool, or a boom or part of a mounting linkage ~herefore~
A general aspect of the invention concerns a material working tool having a first axis of working operation and .; , .
~ a second axis about which the tool is rotatable for ~ posltioning purposes relati~e to material being worked, ':! the second axis being transverse of the first axis, the tool comprising a body housing drive means for its working operation along said firs~ axis9 and a mount for said body which mount includes a rotary transmisslon de~ice rom separate dri~e means for rotating said tool body about said second axis~ the de~ice being in a relatively massi~e mount part, an o~ltpu~ part of said transmission device with a coupling to said tool body to serve and so ro~ate ~l said tool body~ and clamp means located at and operate on `~ said output part to secure that output~part against :;, :. .
. ~ .
`; ~ 3 _ :~
movement relative to said relatively massive mount part during material working operation of said tool in - protecting other parts of said transmission device against forces transmitted to said body in working operation of S said tool along said first axis~
In one embodiment of the invention there is provided a percussive tool mount including a drive trans~ission device by which rotation is to be imparted to the tool : relative to a mounting linkage or boom, or to such a boom or link2ge or part thereof~ and selectively operable clamping, gripping or locating means for securely locating at least i~pact or other transmitted force susceptible part or parts of the said device in operation of the ~ool~
` and preferably relative to the said mounting link or ~ 15 boomO Other aspects of this invention concern tools ; incorporating such a mount, and/or machines9 such as mining machines~ utilising such a tool _ _ 3a ~
: -.
:~:
;. .
., .
, The clamping means may be operable relative to, and preferably directly on, a casing of the gear system, and to this end may inc~ude separate but simultaneously operable clamps spaced about the axis of rotation and the peripher~
5. of the gear system casing.
In one embodiment of the invention utilising an epicyclic gear box immediately adjacent to an impact tool head~
: individual pressure-fluid-operated braking elements are intercoupled for simultaneous operation and are interlocked at 10. least with percussive operation of the tool so as to be actuated into clamping action for the duration of percussive or impacting actionO Such braking elements may be additionall~
I or alternatively interlocked with the application of ~, rotational drive to the gear box for repositioning of the .~ 150 percussive tool by rotation so as to be actuated into their ¦ clamping state except when such rotational drive is applied~
Tne braking elements may conveniently include hydraulically operated pistons supplied from the same source as a hydraulic ` motor for appli.cation of said rotational drive and/or operation . 200 of said percussive tool.
As indicated above, in modificatiorLs of such an embodi_ent of the in~entiont the gear box may actuate an intermediate linkage to the tool which may be of substantial length, and may even be applied at the opposite end of a mounting linkage 25. or boom to that at which the tool head itself is located.
One embodiment of the invention will now be specifically . descri.bedl by way of example, with reference to the l accompanying drawings, in which:--.~ Figure 1 is a sectional view through an impact type mi ning head mount;
,:
~ 4 ::, ,, ,.: , : . , :' . . . ':
Fi~ rG - is a par~ially detalled cross-section of the moll~t o~` ~' g~lre 1 showing details of one cla-llping Tnearls;
~ i~ure 3 is a dr~tailed further sectional view of the clal~iping means of ~igure 2; and 5. ~;g~ure ~ is a diagram o a sui-table electro-hydraulic control system.
In the drawings, a manipulator arm or boom 10 has an inte~ral or otherwise rigidly secllred head 11 with a central transverse bore 12 for holsin~ a rnount for an 10. impact type mineral winning head 13 that is to be rotatable in the bore 120 ~o this end, it is pro~ided with or secured relative to a hollow shaft or open ended casing 14 that fits within the b~re 12 and has spaced peripheral bearing surfaces 15 for cooperating with matchingly 15. disposed bearing surfaces 16 ~n the interior of the bore 12. Externally of the head 11 at the impact head side9 the shalt or casing 14 has a flan,e 17 with an annular bearing surface 18 cooperating with a bearing surface 19 on the head 11.
20. . ~he shaft or casing 14 forms the exterior element of an epic~clic gear box and has a shor-t central shaf-t 21 keyed thereto at 22 and to a planet gear carrier 23 journalled in a s-ta-tionary element 24 of the epicyclic ~ gear box.
.~ 25. ~he stationary elemen-t 24 is a bell-like member with a bearing 25 in an aperture 26 through its crown for a neck part of theplanet wheel carrier 23 which has a f1ange part 26 carr~ing an axle or stub shaft 27 for a toothed planet gear wheel 28. ~he gear wheel 28 meshes with a toothed ring gear 29 fixed to the ;.nterior ; - 5 '~ .', , '. . ,. . , ' ... ' . ': , ., ~ , ,' ' . ' ' , ' ~ ' . ' . . ' . , of the stationary element ~4, and also with a central toothed shaft 31 or a gear wheel therein axially aligned with the sha~t 21.
The shaft 31 has an extension 32 with an axial splined bore 33 for receiving a drive shaft 34 of a suitable drive motor 35, for example a hydraulic mo~or. The extension 32 is journalled externally at 38 in a boom head ~losure plate 39 which is indicated generally at 41 as being secured both to the motor casing and a flange 42 of the bell-like stationary member ~4.
This type of epicyclic gear box is a particul~rly , compact structure, as can be seen from its being housed wholly within the boom head 11, but requires protection agalnst the o~ten very severe impact shocks from a typical percussive mining head, say of the type to which our patent No. 937835 relates. It is therefore proposed herein that the shaft or casing 14 be clamped relative to the comparatively moving head 11 at least during operation ."
of the mining head.
In order to achieve such clamping, the shaft or casing 14 is provided with a central peripheral recess 45 which is shown as having a chamfered side wall and a flat base for cooperating with a correspondingly shaped brake pad elements 46 mounted in bores through the side walls of ~he head 11. In the particular example illustratedi the head ll is of generally octagonal shape a~ its exterior ~ surace and has four such brake elemen~s at diametrically :~, ::
: ~, . ~: . . . .
~ - : . . . : . . .
:.:
, . - , .
opposed faces~ through bores disposed centrally thereo~ and indicated generally by bore axes 47~ ~hese bore~ 47 ha~e an inner portion conforming to th~ brake beari~g pads, an intermediate portion 49 of the greater diameter 5. and an external portion 51 of ~till greater diameter as defined by the annular steps 52 and 53. ~hese i~termediate and outer portions of the bores serve to house and locate flanged brake cylinders 54 and cylinde:r cover plates 55.
The cover plate 55 shown in ~igure 2 has an inwardly 10. extending central dome cooperating with a dished brake actuator piston 56 mounted in sealing arrangement therein.
~he fl~nges of the brake actuator pistons are shown as forming with a rim of the cover plate inlets 60 for hyd~aulic fluid from passageways 61 formed in the head 11 15. for common s~pply of hydraulic actuating fluid ~rom port 62 to ensure that all o~ the brake pistons are operated at the same time so as to symmetrically lock or ~lamp the shaf~ or casing 140 ~his will ensure that~ after repositioning of the tilt angle of the mining head while . 20~ the brake cylinders are unpres~urised, subsequent pressurisation thereof will cause the entire epicyclic gear box assembl~ to be protected against the effects o~
impact shocks. In this respect attention is drawn to the cooperatingly formed mating surfaces at the mouth of the bell-like statisnary member 24 and the ~ha~t or casing 140 I~ Fi~ure ~ special treatment~ such as stelliting9 o~ brake shoe and its ~ating surface is indicated at 65 and the brake piston retaining circlip is referenced 660 In practice, the same supply of hydraulic fluid may be applied both to actuation of the braking units and to operation of the mining head, so that accidental damage through impact shocks is avoided. Alternatively, of course, an interlock may be provided between two 5- separate systems, one for energising the brake s~stem and the other for driving the mining head~ It ma~ be further preferred to have the brake actuator pi.stons unpressurised only when adJustment of the tilt of the mining head is required~ so a3 to avoid the possibility of the mining 10~ head twisting under its own weight about the gear box axis when not actually being used for mining operation~
In this case, it may be preferred for pressure-fluicl . for the braking system to be a separate supply9 so that . it will operate even in the event of failure of the main 15. mining head supply system, and/or to be interlocked to an accumulator in the mining head supply~
~ ~he particular embodiment described has been assumed .~ to be hydraulically driven, however pneumatic drive i9 . . equally possible, and the drive motor 35 ma~ be of any 20~ suitable type~ for example electric, if the conditions of ~ use allow.
.~ Various modifications are, of course, possible, for example in relation to positioning and feeding operating fluid through it is preferred that ~he brake units be ~' 25~ symmetrically disposed about the gear box axis, : - whatever number are used. ~he shaps o~ the boom head 11 ~ is also capable o~ variation and a mining head may be ; 8 ,,.,~ .
", .
: .. :
.. : . : -mounted on a carria~e secured to th~ shaft or casing 14 for rotation, the head itself being slidable in that carriage. As has been mentioned above embodiments of th~
inven~ion are particularly applicable to min:ing heads or other percussive tools utilising a tool drive hammer actuator piston that is driven on its impact:ing stroke by pressurised fluid that is compressed during a preferably hydraulically powered retraction stroke of that piston and ~ refe~ence is directed to patent specification no. 93/835 .~ lO for further information.
It is also preferred that embodiments of this invention be applied to manipulable tool mounting linkages specifically - for mining heads, as referred to in application no. 279755 to which reference is also directed for further inormation.
; One suitable ~lectro-hydraulic control system is shown in Figure 4~ where the brake uni$ and hydraulic head rotation ~otor are sho~n diagrammatically at 70 and 71 and the percussive head at 72. Hydraulic pressure and return lines 739 74 are shown connected to a motor direction control 20 valve 75 and a brake deactivation valve 75. Valve 75 is solenoid-opera~ed be~ween direction reversing positions via solenoids 77, 76 over elec~rical lines 79, 8Q, respectively, :~ from a swi~ch 81~ preferably of joy stick type with a three-arm csntact maker 82 spring loaded to a non-contact-making state. Valve 76 is also solenoid-operable from a : ' bi~ssed rest state as shown via solenoid 83 and electrical line 84 from the switeh 81~ specifically fro~ either of two .:
? _ g _ ,` .,.
- ~ . . :, . - , -: :. :: . - ... ; ' ,.
~ontacts 85, 86 thereoî :mad~ on different direckion~ of mo~or rotatio~ by E3~m8 87, 88 of the contact me~ber 82.
When in itB rest state, valve 76 CQllneCtS bra:~¢h 89 of the pre~sure line ?3 to h~srdraulic lix~e 90 to power the brake unit ~o. When ~olenoid-operated9 ~r~lve 76 connect~ lirLe 90 . to dra:in line j74 to release the brak~ ~it 70 and allow .~ operation of motor ~1 due to pilo~operated valve 9'1 operated via pilot piston 92 over branch line 9~ from hydraulic line goO In its pilo~operated state v~lve 9~1 iB sho~m bridging 10. hydraulic line~ 94 a~a 95 from valve 75. Valve 91 has a biassed rest sta~e, assumed whe~ the pilot line 9~ is unpressurised~ where the lines 94 ~nd ~35 Are coImected to ! drive the motor 71 in a direction dependin~ o~ which of lines ¦ g4 and 95 18 pressurised accordi~g to the state of valve 75 15D It ~hould therefore be apparent that the brake unit , .~ 70 will be released only whe~ valve 76 ~s operated b~
I energisation of its solenoid drivs on operation of switch ~1 ;¦ to select a direction of motor drive. Also~ it is only then .~ that the pilot line 9~ will be unpressurised to allow valve 20~ to assume ita motor ~ri~e permitting state~
¦ A ~ormally open v~lve 96 is also shown in branch 97 provided from pressure l~ne 7.3 to drive percussive operation . of the hammer 7~ This valve 96 is shown at98 a~ beiQg solenoid~operated over branc~ 99 from electrical line ~4 . 5~
to clo~e only when the brake un~t control valve 76 i energised to release ~he brake unit, ~o that impacting of the hammer72 is prevented when the ~rake uni~ i8 released~
:, .
l - 10 .
`:
I It ~ll b~ ~ppreciated that the particular arrangeme~t , illustrated could be modified by havi~g the ~ralYe 96 ! h~draulic~lly operated via a pilot, by the ~alve 9~ being ~ole~oid operated, or by omitti~l~; valve 96 and h~ g the 5c~ hammar 72 driven from the line 90. ,~ O9 o:3~ cour~e~ the valve 91 need :llot bridge the li~e~ 5 wh~ pilot operated, but cou~d simply block them9 i~,ei. be o~ llo~mally orf ~ype ~.
. ! .
1' ' , .
~1 ,,'i ' . ' .
; !
"j, .,,~, ~ ' ' '.
.' ~ . ',.
1: ~ 11 -'.'' ~ ' . :: ' . ' '
Claims (14)
1. A material working tool having a first axis of working operation and a second axis about which the tool is rotatable for positioning purposes relative to material being worked, the second axis being transverse of the first axis, the tool comprising a body housing drive means for its working operation along said first axis and a mount for said body which mount includes a rotary transmission device from separate drive means for rotating said tool body about said second axis, the device being in a relatively massive mount part, an output part of said transmission device with a coupling to said tool body to serve and so rotate said tool body, and clamp means located at and operate on said output part to secure that output part against movement relative to said relatively massive mount part during material working operation of said tool in protecting other parts of said transmission device against forces transmitted to said body in working operation of said tool along said first axis.
2. A mounting arrangement as claimed in claim 1, wherein said rotary transmission device is a gear system, and wherein said output part is a casing for said gear system.
3. A mounting arrangement as claimed in claim 2, wherein said gear system is of epicyclic type.
4. A mounting arrangement as claimed in claim 3, wherein said clamp means includes a plurality of simultaneously operable clamps spaced about said second axis.
5. A mounting arrangement as claimed in claim 4, wherein each clamp comprises a pressure-fluid-operable element.
6. A mounting arrangement as claimed in claim 5, including means interlocking operation of said clamps and operation of said drive means for rotating said tool body, such that said clamps are actuated except when said rotary drive is operative.
7. A mounting arrangement as claimed in claim 4, further comprising a common source of pressure fluid for said drive means for rotating said tool body and for said clamps.
8. A mounting arrangement as claimed in claim 6, further comprising a common source of pressure fluid for said clamps and for said tool element.
9. A mounting arrangement as claimed in claim 5, wherein each clamp includes a brake shoe and a pressure-fluid operated piston therefor.
10. A mounting arrangement as claimed in claim 9, wherein each piston is housed in said relatively massive mount pare to act radially thereof.
11. A mounting arrangement as claimed in claim 1, wherein the rotary transmission device and the clamp means are positioned immediately adjacent to the mount.
12. A mounting arrangement as claimed in claim 1, extending from a self-propelling machine.
13. A mounting arrangement as claimed in claim 1, wherein the rotary drive transmission device serves only for rotating said tool body and is separate from working drive for the tool element.
14. A mounting arrangement as claimed in claim 13, wherein said tool element is a reciprocable impacting part movable along said first axis.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28403/76A GB1585119A (en) | 1976-07-08 | 1976-07-08 | Tool mount |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1064060A true CA1064060A (en) | 1979-10-09 |
Family
ID=10275075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA282,275A Expired CA1064060A (en) | 1976-07-08 | 1977-07-07 | Percussive tool mount |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU2661777A (en) |
| CA (1) | CA1064060A (en) |
| DE (1) | DE2730398C3 (en) |
| FR (1) | FR2357725A1 (en) |
| GB (1) | GB1585119A (en) |
| ZA (1) | ZA774012B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10205124C1 (en) * | 2002-02-07 | 2003-04-17 | Dbt Gmbh | Extraction machine, for digging out hard rock e.g. platinum ore, has an eccentric shaft through a sleeve supported in a housing, as the drive for a cycloid gear to power the cutters |
-
1976
- 1976-07-08 GB GB28403/76A patent/GB1585119A/en not_active Expired
-
1977
- 1977-06-30 AU AU26617/77A patent/AU2661777A/en active Pending
- 1977-07-04 ZA ZA00774012A patent/ZA774012B/en unknown
- 1977-07-06 DE DE2730398A patent/DE2730398C3/en not_active Expired
- 1977-07-07 FR FR7720914A patent/FR2357725A1/en active Granted
- 1977-07-07 CA CA282,275A patent/CA1064060A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA774012B (en) | 1979-06-27 |
| GB1585119A (en) | 1981-02-25 |
| FR2357725B3 (en) | 1980-05-23 |
| AU2661777A (en) | 1979-01-04 |
| DE2730398A1 (en) | 1978-01-19 |
| DE2730398B2 (en) | 1979-05-17 |
| DE2730398C3 (en) | 1980-01-17 |
| FR2357725A1 (en) | 1978-02-03 |
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