CA1138214A - Pivotable roof bolter for mining machine - Google Patents
Pivotable roof bolter for mining machineInfo
- Publication number
- CA1138214A CA1138214A CA000391791A CA391791A CA1138214A CA 1138214 A CA1138214 A CA 1138214A CA 000391791 A CA000391791 A CA 000391791A CA 391791 A CA391791 A CA 391791A CA 1138214 A CA1138214 A CA 1138214A
- Authority
- CA
- Canada
- Prior art keywords
- canopy
- mining machine
- section
- mast
- roof
- 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
Landscapes
- Earth Drilling (AREA)
Abstract
PIVOTAL ROOF BOLTER AND EXTENDABLE
ROTATABLE PROTECTIVE CANOPY FOR MINING MACHINE
Abstract of the Disclosure An improvement for a combination mining machine and roof bolting apparatus which includes a mining machine moveable along a mine entry which can remove coal from a mine face, the machine also including a roof bolt installing mechanism. The improvement includes an arm, the roof bolt mechanism being mounted on one end of the arm, the other end of the arm being pivotally connected to the mining machine. The mining machine can also include a protective canopy which is moveable to a position in close proximity to the roof bolt installing mechanism.
ROTATABLE PROTECTIVE CANOPY FOR MINING MACHINE
Abstract of the Disclosure An improvement for a combination mining machine and roof bolting apparatus which includes a mining machine moveable along a mine entry which can remove coal from a mine face, the machine also including a roof bolt installing mechanism. The improvement includes an arm, the roof bolt mechanism being mounted on one end of the arm, the other end of the arm being pivotally connected to the mining machine. The mining machine can also include a protective canopy which is moveable to a position in close proximity to the roof bolt installing mechanism.
Description
113~321~
This invention relates to mining machines and, in particular, continuous coal mining machines which are equipped with a device which can be used for installing roof,support bolts as the mining machine advances along a mine entry.
This is a division of copending Canadian Patent Appli-cation Serial Number 340,255, filed November 20, 1979.
Much underground coal mining is done by continuous mining machines which remove coal along the, full hei~ht of the - - coal seam and include a gathering and conveying system so that ' the machine can advance while it mines. In order for such machines to advance greater distances into a seam, depending on roof conditions, continuous mining machines have been equipped with devices for installing roof sup~ort bolts in the mine roof.
This has been done to save time by eliminating the need to back the mining machine out of an entry and have a separate roof bolting machine install the roof bolts.
It has been found that by positioning such a roof bolting unit on each side of a continuous mining machine, two bolts may be installed along the lateral center line of a mine entry. It has also been found that this does not always provide sufficient support for the mine roof and that additional bolts norm21ly must be instalJed in order to provide safe roof conditions. mus, ever~
though provision of roof bolting units on a mining machine can provide m~re efficient installation of roof bolts, additiona,l roof bolts must be installed along the lateral center line of a mine e,ntry which requires use of a sepæate mof bolting machine and linits the distance a mining machine can advance before the additional b~lting o2er~tion must be performed.
Whenever these roof bolt installation units are mounted on a continuous mining machine, the bolter operator might be -1 ~
. ~. .
11382~L4 exposed to rocks or debris which miaht fall from the mine xoo-E
while installing the roof bolt. A protective canopy can be provided which operates to shield the operator from falling rock.
Such a canopy is normally formed of heavy material and takes up a ~elatively large amount of space in order to provide adequate protection.
According ~o the present invention there is ~rovided a pivotable protective canopy for an underground minin~ machine which has a work performing apparatus pivotable about a vertical axis in order to perform its work at different locations without ~oving the machine, the canopy being piYotable independent but associable with the apparatus such that an operator can operate the apparatus while under protection of the c~nopy. ~he canopy has a vertically extensible support mast includin~ a first tubular section affixed to the mining machine and a second tubular section slidably engageable with the first section. ~ fluid-pressUre operated cylinder is disposed interiorally of the tubular sections with one of its ends connected to the first section and its other end connected to the second section. A canopy shield is pivotably mounted on the second tubular section and canti-leveredly extends there~rom. The mast and cylinders are cooper-~tively operable to raise and lower the canapy shield with respect to the mine roof, and the slidin~ fit between the tubular mast sections is such that all the moment loads from the canopy ~;
shield are transferred through the mast sections to the minin~
machine, while the ~luid cylinder incurs substantially only axial compressive load.
A canopy constructed in accordance with the invention may be provided for each bolter and desi~ned to provide adequate .
, ~1382~4 protection for the operator at all positions of the bolters and still be relatively light in weight and small in size. The canopy is extendable from a lowered position to a raised position so that the canopy can be raised to abut the mine roof to support the roof as well as provide an extra measure of protection. In a specific embodiment of the invention, the canopy is fan-shaped and rotatable through 360 so that the size and wei~ht are kept to a minimum and the operator is protected at all positions of the bolter.
These and other features and objects of the invention will become apparent fEom a detailed description of a preferred embodiment set forth below taken in conjunction with the accom-panying drawings.
BRIEF DESCRIPTION OF THE DRAWI~JGS
Figure 1 is a perspective view of a continuous mining machine suitable for use with the pivotal roof bolter and extendable protective canopy;
Figure 2 is a side elevational view of a portion of the machine of Fi~ure 1, which shows, in particular, a roof bolter and canopy;
Figure 3 i8 a top elevational view of the portion of the machine as shown in Fig. 2, which shows in particular the roof bolter and canopy and their paths of ~ovement; and Figure 4 is a side elevational view, partially in section, showing structura~ details of the canopy.
DETAILED DESCRIPTIO~ OF A PREFERRED EMBODIMENT
Referring to Fig. 1, a continuous mining machine is shown which is designated generally by reference numeral 10.
The mining machine 10 includes a rotatable and vertically moveable li38;~4 cutting head 12 and a gatherin~ apparatus 14 for transporting coal removed by the cuttin~ head 12 from the mine face (not shown) to a conveyor 16 which extends along the lon~itudinal axis of the machine 10. The mining machine 10 is controlled by an operator who sits in a compartment 18 located at the rear of the machine 10. Such a machine and its operation are known in the art.
As shown best in Figs. 2 and 3, an auger or drill/roof - bolting unit 20 is mounted on each side of the machine 10. ~he bolting units 20 are known in the art and include a motor 21 for rotating a chuck portion 22 and a suitable mechanism (not shown) for raising and lowerin~ the units as shown by arrow 23 in Fig. 2 so that a hole can be drilled in the mine roof (not shown) and a roof bolt inserted. Since this is a standard operation, no f.urther description will be given.
Each bolter 20 is mounted on an arm 24 which itself is mounted on the mining machine 10 at a pivot point 26 so that each bolter 20 can move throu~h a 180 sweep as shown by the broken lines and arrows 27 in Fig. 3. Movement of each of the bolters 20 is controlled by means of a suitable hydraulic mechanism (not shownj. The bolters 20 are controlled by the machine operator manipulatin~ handles 28 of a hydraulic control panel 29 which is pivotally mounted on the machine 10 as shown in Fig. 2 and can be moved as shown by arrows 30 in Fia. 3 fo~
operator convenience.
Tlie above-desaribed bolter arrangement is also described and is claimed in above-identified parent application Serial number 340,255.
As shown best in Fig. 3, a protective canopy 32 is ' ' 1~38Z~4 located near each of the bolters 20 to protect the operator while he is operating the bolter 20. The canopy 32 is fan-shaped and rotatable throughout 360 sweep about a pivot point 34 as shown by arrows 35, the structure allowing such movement being described in greater detail below. In this way, the canopy 32 can be moved by the operator for protection at any position of the bolter 20 and the weight of the canopy 32 is kept at a minimum.
As shown best in Fig. 2, the canopy 32 is also movable up and down as indicated by broken lines and arrow 36 to provide additional support on the mine roof durin~ bolting operations.
Additional roof supports such as those indicated by reference numeral 37 can also be provided.
The canopy 32 is mounted on a shaft generally designated by reference numeral 38 and is formed of l-inch thick steel plate, weighing 300-400 pounds. In order to provide a canopy 3 which is relatively light in wei~ht and will still protect the operator at all positions of the bolters 20, the canopy 32 is cantilevered from the shaft 38. For the canopy 32 to be verti-cally moveable, as shown by the arrow 36, without exerting undue force on the hydrualic mechanism used for raising and lowering the canopy 32 (which is described in detail below), the shaft 38 has been designed to absorb all of the moment load of the canopy 32 so that the hydraulic mechanism will only support the vertical load component.
As''shcwn in Fig. 4, the shaft 38 includes an inner sleeve 40 on ' which the canopy 32 is mLunted, an op~ng 42 in'the cano~y 32 fitting over the top of the inner sleeve 40. A grease connection 44 is provided for lubricating the bearin~`surfaces between'the inner sleeve 4Q and o~ening 42.
A plurality of stop openings 46 are spaced apart around the outer surfaoe of the inner sleeve 40 for cooperating with a pin 48 - 4a -11382~4 which is moveably mounted on the canopy 32. A spring 50 which bears on one side against a washer 52 held in place by a pin 54 and on the other side against a support 56 for the pin 48 so that the pin can be retracted in the direction of an arrow 58 to allow the operator manually to rotate the canopy 32 as indicated by the arrows 35. When the desired position is reached, the operator releases the pin 48 and the spring 50 will urge it back into the appropriate stop opening 46.
The shaft 38 also includes an outer sleeve 60 which , 10 is connected to the mining machine lO by appropriate means such as, for example, appropriate bolts and supports generally indicated in Fig. 3 by reference numeral 61. As shown on Fig.
4, the inner sleeve 40 and outer sleeve 60 are shaped and, dimensioned so the inner sleeve is vertically slideable within the outer sleeve 60. A grease connection 62 is provided on the outer surface of the outer sleeve 60 for lubricating the bearing surfaces of the two sleeves. A hydraulic piston and cylinder mechanism 64 is mounted within the inner and outer sleeves 40, 60, the piston being connected to the outer sleeve - 20 60 through a pin 66 and the cylinder being connected to the inner sleeve 40 through a pin 68 to effect the appropriate up and down movement that is shown by the arrow 36.
As shown in Fig. 4, the inner sleeve 40 includes,a guide arm 70 which is connected to its outer surface and projects 25 ' longitudinally relative to the inner sleeve 40 for coopera~ing with an opening 72 locatea in a flange-projecting from the outer sleeve 6~ for preventing any relative rotation between the sleeves ~0, 60. A cover 74 is provided on the top of the inner sleeve 40, which is held in place by appropriate bolts 76. A pair of flanges 78 project from the ou~er surface of the outer sleeve 60, on which the control unit 29 can be mounted, as shown in Figs. 2 and 3.
Whenever the mining machine lO reaches a point where ' roof bolts should be installed forwara progress of the machine is stopped and the operator will install the roof bolts along the lateral center line o the mine entry by positioning the bolters 20 at appropriate positions as described above. As the bolter 20 is moved along different positions of the sweep ~indicated by the arrows 27, the canopy 32 is lowered and rotated as described above, and then raised to provide additional support on the mine roof and protection for the operator.
..... , .. . . ., .. , .. .... ~ ... . ... . ... . . .. . ~ . .. . . . .
1~38~14 ln this way, bolting operations are made more efficient by eliminating the need to move the mining machine out of the entry and bring in a bolting machine.
It should be understood that the invention which has been described in detail above can be modified and improved by tho~e skilled in the art and that all such modifications and improvements are contemplated as falling within the scop~
of the appended claims.
This invention relates to mining machines and, in particular, continuous coal mining machines which are equipped with a device which can be used for installing roof,support bolts as the mining machine advances along a mine entry.
This is a division of copending Canadian Patent Appli-cation Serial Number 340,255, filed November 20, 1979.
Much underground coal mining is done by continuous mining machines which remove coal along the, full hei~ht of the - - coal seam and include a gathering and conveying system so that ' the machine can advance while it mines. In order for such machines to advance greater distances into a seam, depending on roof conditions, continuous mining machines have been equipped with devices for installing roof sup~ort bolts in the mine roof.
This has been done to save time by eliminating the need to back the mining machine out of an entry and have a separate roof bolting machine install the roof bolts.
It has been found that by positioning such a roof bolting unit on each side of a continuous mining machine, two bolts may be installed along the lateral center line of a mine entry. It has also been found that this does not always provide sufficient support for the mine roof and that additional bolts norm21ly must be instalJed in order to provide safe roof conditions. mus, ever~
though provision of roof bolting units on a mining machine can provide m~re efficient installation of roof bolts, additiona,l roof bolts must be installed along the lateral center line of a mine e,ntry which requires use of a sepæate mof bolting machine and linits the distance a mining machine can advance before the additional b~lting o2er~tion must be performed.
Whenever these roof bolt installation units are mounted on a continuous mining machine, the bolter operator might be -1 ~
. ~. .
11382~L4 exposed to rocks or debris which miaht fall from the mine xoo-E
while installing the roof bolt. A protective canopy can be provided which operates to shield the operator from falling rock.
Such a canopy is normally formed of heavy material and takes up a ~elatively large amount of space in order to provide adequate protection.
According ~o the present invention there is ~rovided a pivotable protective canopy for an underground minin~ machine which has a work performing apparatus pivotable about a vertical axis in order to perform its work at different locations without ~oving the machine, the canopy being piYotable independent but associable with the apparatus such that an operator can operate the apparatus while under protection of the c~nopy. ~he canopy has a vertically extensible support mast includin~ a first tubular section affixed to the mining machine and a second tubular section slidably engageable with the first section. ~ fluid-pressUre operated cylinder is disposed interiorally of the tubular sections with one of its ends connected to the first section and its other end connected to the second section. A canopy shield is pivotably mounted on the second tubular section and canti-leveredly extends there~rom. The mast and cylinders are cooper-~tively operable to raise and lower the canapy shield with respect to the mine roof, and the slidin~ fit between the tubular mast sections is such that all the moment loads from the canopy ~;
shield are transferred through the mast sections to the minin~
machine, while the ~luid cylinder incurs substantially only axial compressive load.
A canopy constructed in accordance with the invention may be provided for each bolter and desi~ned to provide adequate .
, ~1382~4 protection for the operator at all positions of the bolters and still be relatively light in weight and small in size. The canopy is extendable from a lowered position to a raised position so that the canopy can be raised to abut the mine roof to support the roof as well as provide an extra measure of protection. In a specific embodiment of the invention, the canopy is fan-shaped and rotatable through 360 so that the size and wei~ht are kept to a minimum and the operator is protected at all positions of the bolter.
These and other features and objects of the invention will become apparent fEom a detailed description of a preferred embodiment set forth below taken in conjunction with the accom-panying drawings.
BRIEF DESCRIPTION OF THE DRAWI~JGS
Figure 1 is a perspective view of a continuous mining machine suitable for use with the pivotal roof bolter and extendable protective canopy;
Figure 2 is a side elevational view of a portion of the machine of Fi~ure 1, which shows, in particular, a roof bolter and canopy;
Figure 3 i8 a top elevational view of the portion of the machine as shown in Fig. 2, which shows in particular the roof bolter and canopy and their paths of ~ovement; and Figure 4 is a side elevational view, partially in section, showing structura~ details of the canopy.
DETAILED DESCRIPTIO~ OF A PREFERRED EMBODIMENT
Referring to Fig. 1, a continuous mining machine is shown which is designated generally by reference numeral 10.
The mining machine 10 includes a rotatable and vertically moveable li38;~4 cutting head 12 and a gatherin~ apparatus 14 for transporting coal removed by the cuttin~ head 12 from the mine face (not shown) to a conveyor 16 which extends along the lon~itudinal axis of the machine 10. The mining machine 10 is controlled by an operator who sits in a compartment 18 located at the rear of the machine 10. Such a machine and its operation are known in the art.
As shown best in Figs. 2 and 3, an auger or drill/roof - bolting unit 20 is mounted on each side of the machine 10. ~he bolting units 20 are known in the art and include a motor 21 for rotating a chuck portion 22 and a suitable mechanism (not shown) for raising and lowerin~ the units as shown by arrow 23 in Fig. 2 so that a hole can be drilled in the mine roof (not shown) and a roof bolt inserted. Since this is a standard operation, no f.urther description will be given.
Each bolter 20 is mounted on an arm 24 which itself is mounted on the mining machine 10 at a pivot point 26 so that each bolter 20 can move throu~h a 180 sweep as shown by the broken lines and arrows 27 in Fig. 3. Movement of each of the bolters 20 is controlled by means of a suitable hydraulic mechanism (not shownj. The bolters 20 are controlled by the machine operator manipulatin~ handles 28 of a hydraulic control panel 29 which is pivotally mounted on the machine 10 as shown in Fig. 2 and can be moved as shown by arrows 30 in Fia. 3 fo~
operator convenience.
Tlie above-desaribed bolter arrangement is also described and is claimed in above-identified parent application Serial number 340,255.
As shown best in Fig. 3, a protective canopy 32 is ' ' 1~38Z~4 located near each of the bolters 20 to protect the operator while he is operating the bolter 20. The canopy 32 is fan-shaped and rotatable throughout 360 sweep about a pivot point 34 as shown by arrows 35, the structure allowing such movement being described in greater detail below. In this way, the canopy 32 can be moved by the operator for protection at any position of the bolter 20 and the weight of the canopy 32 is kept at a minimum.
As shown best in Fig. 2, the canopy 32 is also movable up and down as indicated by broken lines and arrow 36 to provide additional support on the mine roof durin~ bolting operations.
Additional roof supports such as those indicated by reference numeral 37 can also be provided.
The canopy 32 is mounted on a shaft generally designated by reference numeral 38 and is formed of l-inch thick steel plate, weighing 300-400 pounds. In order to provide a canopy 3 which is relatively light in wei~ht and will still protect the operator at all positions of the bolters 20, the canopy 32 is cantilevered from the shaft 38. For the canopy 32 to be verti-cally moveable, as shown by the arrow 36, without exerting undue force on the hydrualic mechanism used for raising and lowering the canopy 32 (which is described in detail below), the shaft 38 has been designed to absorb all of the moment load of the canopy 32 so that the hydraulic mechanism will only support the vertical load component.
As''shcwn in Fig. 4, the shaft 38 includes an inner sleeve 40 on ' which the canopy 32 is mLunted, an op~ng 42 in'the cano~y 32 fitting over the top of the inner sleeve 40. A grease connection 44 is provided for lubricating the bearin~`surfaces between'the inner sleeve 4Q and o~ening 42.
A plurality of stop openings 46 are spaced apart around the outer surfaoe of the inner sleeve 40 for cooperating with a pin 48 - 4a -11382~4 which is moveably mounted on the canopy 32. A spring 50 which bears on one side against a washer 52 held in place by a pin 54 and on the other side against a support 56 for the pin 48 so that the pin can be retracted in the direction of an arrow 58 to allow the operator manually to rotate the canopy 32 as indicated by the arrows 35. When the desired position is reached, the operator releases the pin 48 and the spring 50 will urge it back into the appropriate stop opening 46.
The shaft 38 also includes an outer sleeve 60 which , 10 is connected to the mining machine lO by appropriate means such as, for example, appropriate bolts and supports generally indicated in Fig. 3 by reference numeral 61. As shown on Fig.
4, the inner sleeve 40 and outer sleeve 60 are shaped and, dimensioned so the inner sleeve is vertically slideable within the outer sleeve 60. A grease connection 62 is provided on the outer surface of the outer sleeve 60 for lubricating the bearing surfaces of the two sleeves. A hydraulic piston and cylinder mechanism 64 is mounted within the inner and outer sleeves 40, 60, the piston being connected to the outer sleeve - 20 60 through a pin 66 and the cylinder being connected to the inner sleeve 40 through a pin 68 to effect the appropriate up and down movement that is shown by the arrow 36.
As shown in Fig. 4, the inner sleeve 40 includes,a guide arm 70 which is connected to its outer surface and projects 25 ' longitudinally relative to the inner sleeve 40 for coopera~ing with an opening 72 locatea in a flange-projecting from the outer sleeve 6~ for preventing any relative rotation between the sleeves ~0, 60. A cover 74 is provided on the top of the inner sleeve 40, which is held in place by appropriate bolts 76. A pair of flanges 78 project from the ou~er surface of the outer sleeve 60, on which the control unit 29 can be mounted, as shown in Figs. 2 and 3.
Whenever the mining machine lO reaches a point where ' roof bolts should be installed forwara progress of the machine is stopped and the operator will install the roof bolts along the lateral center line o the mine entry by positioning the bolters 20 at appropriate positions as described above. As the bolter 20 is moved along different positions of the sweep ~indicated by the arrows 27, the canopy 32 is lowered and rotated as described above, and then raised to provide additional support on the mine roof and protection for the operator.
..... , .. . . ., .. , .. .... ~ ... . ... . ... . . .. . ~ . .. . . . .
1~38~14 ln this way, bolting operations are made more efficient by eliminating the need to move the mining machine out of the entry and bring in a bolting machine.
It should be understood that the invention which has been described in detail above can be modified and improved by tho~e skilled in the art and that all such modifications and improvements are contemplated as falling within the scop~
of the appended claims.
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A pivotable protective canopy for an underground mining machine which has a work performing apparatus which is pivotable about a vertical axis in order to perform its work at different locations without moving the machine, which canopy is pivotable independent of but associable with the apparatus such that an operator can operate the apparatus while under protection of the canopy, comprising:
a vertically extensible support mast including a first tubular section affixed to the mining machine, and a second tubular section slidably engaged with the first section;
a fluid-pressure operated cylinder disposed interiorally of the tubular sections with one of its ends connected to the first section and its other end connected to the second section;
and a canopy shield pivotably mounted on the second tubular section and cantileveredly extending therefrom;
wherein the mast and cylinder are cooperatively operable to raise and lower the canopy shield with respect to the mine roof, and the sliding fit between the tubular mast sections is such that all the moment loads from the canopy shield are transferred through the mast sections to the mining machine, while the fluid cylinder incurs substantially only axial compressive load.
a vertically extensible support mast including a first tubular section affixed to the mining machine, and a second tubular section slidably engaged with the first section;
a fluid-pressure operated cylinder disposed interiorally of the tubular sections with one of its ends connected to the first section and its other end connected to the second section;
and a canopy shield pivotably mounted on the second tubular section and cantileveredly extending therefrom;
wherein the mast and cylinder are cooperatively operable to raise and lower the canopy shield with respect to the mine roof, and the sliding fit between the tubular mast sections is such that all the moment loads from the canopy shield are transferred through the mast sections to the mining machine, while the fluid cylinder incurs substantially only axial compressive load.
2. The canopy of claim 1, wherein the mast sections are cylindrical in shape with a telescopic sliding fit.
3. The canopy of claim 1, and further including means for selectively locking and unlocking the canopy from rotational movement about the mast.
4. The canopy of claim 1, wherein the canopy is fan-shaped, the canopy being mounted on the second section at the narrow end of the fan-shape.
5. The canopy of claim 2 , further including means to prevent relative rotation between the first and second mast sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000391791A CA1138214A (en) | 1978-12-26 | 1981-12-08 | Pivotable roof bolter for mining machine |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US972,759 | 1978-12-26 | ||
| US05/972,759 US4297057A (en) | 1978-12-26 | 1978-12-26 | Pivotal roof bolter and extendable rotatable protective canopy for mining machine |
| CA000340255A CA1158448A (en) | 1978-12-26 | 1979-11-20 | Pivotal roof bolter and extendable rotatable protective canopy for mining machine |
| CA000391791A CA1138214A (en) | 1978-12-26 | 1981-12-08 | Pivotable roof bolter for mining machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1138214A true CA1138214A (en) | 1982-12-28 |
Family
ID=27166497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391791A Expired CA1138214A (en) | 1978-12-26 | 1981-12-08 | Pivotable roof bolter for mining machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1138214A (en) |
-
1981
- 1981-12-08 CA CA000391791A patent/CA1138214A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |