CA2238540A1 - Material conveyor - Google Patents
Material conveyor Download PDFInfo
- Publication number
- CA2238540A1 CA2238540A1 CA 2238540 CA2238540A CA2238540A1 CA 2238540 A1 CA2238540 A1 CA 2238540A1 CA 2238540 CA2238540 CA 2238540 CA 2238540 A CA2238540 A CA 2238540A CA 2238540 A1 CA2238540 A1 CA 2238540A1
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- CA
- Canada
- Prior art keywords
- belt
- conveyor
- track
- pans
- wheel assembly
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/02—Belt- or chain-engaging elements
- B65G23/14—Endless driving elements extending parallel to belt or chain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/42—Belts or like endless load-carriers made of rubber or plastics having ribs, ridges, or other surface projections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/02—Belt- or chain-engaging elements
- B65G23/14—Endless driving elements extending parallel to belt or chain
- B65G23/16—Endless driving elements extending parallel to belt or chain with dogs engaging abutments on belts or chains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Belt Conveyors (AREA)
Abstract
The invention relates to a material conveyor which can be used for heavy loading and wet materials. The conveyor an apron conveyor assembly about which is mounted a conveyor belt on which the material is conveyed. The apron conveyor provides structural support to the belt and drives the belt by friction between the steel pans and the belt. The rubber belt is preferably continuous so that it will contain wet materials and prevent the wet material from leaking into the drive assembly. To avoid damage to the belt by the expanding pans of the drive assembly, for example during the directional change, the belt is provided with its own head and tail pulleys.
Description
MATERIAL CONVEYOR
Field of the Invention This invention is directed to a material conveyor and, in particular, to a material conveyor particularly suited for use in heavy loading of wet, loose and/or sticky materials.
Background of the Invention There are many types of material conveyors. One conveyor is termed the apron conveyor and another is a belt conveyor. Each of these conveyors have different uses because of their different construction and ability to withstand loading.
A conventional apron conveyor is comprised of overlapping steel pans attached onto chains or joined by integral links and driven by sprockets.
The underside of the overlapping pans are reinforced to withstand the impact and pressure of heavy loading. Connected to the chain rails the steel pans from an endless steel belt conveying medium which is supported by rollers which are evenly spaced between a head drive sprocket assembly and tail idler sprocket assembly.
Apron conveyors are used where extremely rugged machines are required. They handle all types of materials from wet and sticky ore to large quarried rock.
Unlike vibrating conveyors, apron conveyors will deliver essentially the same volume of material regardless of the material type.
Field of the Invention This invention is directed to a material conveyor and, in particular, to a material conveyor particularly suited for use in heavy loading of wet, loose and/or sticky materials.
Background of the Invention There are many types of material conveyors. One conveyor is termed the apron conveyor and another is a belt conveyor. Each of these conveyors have different uses because of their different construction and ability to withstand loading.
A conventional apron conveyor is comprised of overlapping steel pans attached onto chains or joined by integral links and driven by sprockets.
The underside of the overlapping pans are reinforced to withstand the impact and pressure of heavy loading. Connected to the chain rails the steel pans from an endless steel belt conveying medium which is supported by rollers which are evenly spaced between a head drive sprocket assembly and tail idler sprocket assembly.
Apron conveyors are used where extremely rugged machines are required. They handle all types of materials from wet and sticky ore to large quarried rock.
Unlike vibrating conveyors, apron conveyors will deliver essentially the same volume of material regardless of the material type.
These conveyors are normally located ahead of large stationary crushers because of their ability to handle heavy impact loading which occurs when haul trucks dump to the conveyor. Apron conveyors are also found at the discharge of very large primary crushers or under deep bin hoppers because they can absorb much more impact than conventional rubber conveyor belts and frames can withstand. Typically, apron conveyors are used whenever it is necessary to handle a high tonnage of coarse abrasive material or where the loading or discharge environments demand a machine capable of withstanding severe material handling forces.
The major disadvantage or drawback of the apron conveyor is its high operating costs.
Because the steel pan conveying assembly is not a sealed unit, the spaces between the pans allow abrasive fines to come in contact with the chains, chain rollers and drive sprocket assemblies of the conveyor. This problem can be especially destructive when the material is wet and sticky as the water helps to spread the abrasive fines onto bearing surfaces and into pin joints. If the material is especially mucky it will pack up in the chain rails and cause premature failure of the unit.
Belt conveyors are sealed units and are effective at handling wet or loose materials.
However, belt conveyors cannot be used for heavy loading.
Belt conveyors cannot be readily combined with apron conveyors. If a belt conveyor is wrapped around an apron conveyor, the belt is quickly ripped apart by the expansion of the apron conveyor pans as they move around the drive sprocket assemblies.
Summary of the Invention A material conveyor has been invented which is useful for heavy loading and which can handle wet, loose and/or sticky material substantially without leakage of the material into the conveyor.
The major disadvantage or drawback of the apron conveyor is its high operating costs.
Because the steel pan conveying assembly is not a sealed unit, the spaces between the pans allow abrasive fines to come in contact with the chains, chain rollers and drive sprocket assemblies of the conveyor. This problem can be especially destructive when the material is wet and sticky as the water helps to spread the abrasive fines onto bearing surfaces and into pin joints. If the material is especially mucky it will pack up in the chain rails and cause premature failure of the unit.
Belt conveyors are sealed units and are effective at handling wet or loose materials.
However, belt conveyors cannot be used for heavy loading.
Belt conveyors cannot be readily combined with apron conveyors. If a belt conveyor is wrapped around an apron conveyor, the belt is quickly ripped apart by the expansion of the apron conveyor pans as they move around the drive sprocket assemblies.
Summary of the Invention A material conveyor has been invented which is useful for heavy loading and which can handle wet, loose and/or sticky material substantially without leakage of the material into the conveyor.
In accordance with a broad aspect of the present invention, there is provided a material conveyor comprising: an apron conveyor assembly including a continuous track formed of pivotally connected pans, each pan being rigid and having an upper surface, the track being mounted on and engaged by a head wheel assembly and a tail wheel assembly, at least one of the head wheel assembly and the tail wheel assembly being driven to rotate by a rotary drive means to drive the track about the wheels;
and, a conveyor belt formed as a continuous loop having an inner surface and an outer surface and being mounted on a head pulley and a tail pulley, the conveyor belt being disposed about the apron conveyor such that at least a portion of the inner surface of the belt can be brought into contact with the apron conveyor, such that when the track is driven around the head wheel assembly and the tail wheel assembly, the belt is driven by frictional contact with the track around the pulleys.
In one embodiment, the apron conveyor is disposed within the loop of the belt and the head wheel assembly and tail wheel assembly are positioned in the space between the head pulley and the tail pulley. Thus, the belt is generally positioned around the track.
Preferably, the belt is positioned such that a portion of the inner surface of the belt is in contact with the track.
In a preferred embodiment, the head wheel assembly is a sprocket wheel and the tail wheel assembly is an idler.
The pans of the track are formed to be rigid and, thus, can withstand heavy loading.
The pans are preferably formed of a rigid, durable material such as steel or a high strength polymer. In one embodiment, the pans include a top bearing surface, defining the upper surface, and have attached thereto or formed integral therewith a link means for pivotal connection to adjacent pans and for engagement with the sprocket wheel or other driving means. Preferably, the track is formed such that the pans are closely arranged. In this way, the track provides a substantially continuous bearing surface with which to support the belt. Preferably, the pivotal connections between the pans are selected such that the track can flex in substantially one direction only.
In particular, preferably the pans and/or links are formed to limit the rotation of the pans relative to one another so that the track can flex around the sprocket and idler wheels but is limited in its ability to flex in the opposite direction. In one embodiment, an apron plate extends from at least one of the pans in the track so that the apron plate overlaps at least one of the pans adjacent to the pan to which it is attached. The apron plate establishes continuous support between adjacent pans in the track and limits the rotation of the adjacent pans.
To facilitate frictional engagement between the belt and the track, preferably the upper surface of at least one of the pans is formed to provide enhanced frictional engagement with the belt. In one embodiment, the upper surface of at least one of the pans is formed to releasably engage the belt. Such releasable engagement can be provided by knurling and/or roughening the upper surface of the pan or by the provision of teeth or protrusions on the upper surface of the pan.
In one embodiment, the belt is modified to increase its useful life.
Preferably, a pad is secured to the inner surface of the belt to be in contact with the track.
Preferably, a plurality of pads are secured to the inner surface of the belt, the pads being elongate with a long axis and being spaced apart along the belt with their long axis extending along the width of the belt. The pads are preferably formed of a resilient material such as rubber and are cast integrally with the belt or secured thereto by fasteners, adhesives or other suitable means.
Preferably, the head wheel assembly includes a pair of sprocket wheels and the tail wheel assembly includes a pair of idler wheels which can be separate or formed integral with a drum. The sprocket wheels are preferably driven to rotate simultaneously by the rotary drive system, while the tail wheels and the pulleys of the belt have no connection to a drive means.
and, a conveyor belt formed as a continuous loop having an inner surface and an outer surface and being mounted on a head pulley and a tail pulley, the conveyor belt being disposed about the apron conveyor such that at least a portion of the inner surface of the belt can be brought into contact with the apron conveyor, such that when the track is driven around the head wheel assembly and the tail wheel assembly, the belt is driven by frictional contact with the track around the pulleys.
In one embodiment, the apron conveyor is disposed within the loop of the belt and the head wheel assembly and tail wheel assembly are positioned in the space between the head pulley and the tail pulley. Thus, the belt is generally positioned around the track.
Preferably, the belt is positioned such that a portion of the inner surface of the belt is in contact with the track.
In a preferred embodiment, the head wheel assembly is a sprocket wheel and the tail wheel assembly is an idler.
The pans of the track are formed to be rigid and, thus, can withstand heavy loading.
The pans are preferably formed of a rigid, durable material such as steel or a high strength polymer. In one embodiment, the pans include a top bearing surface, defining the upper surface, and have attached thereto or formed integral therewith a link means for pivotal connection to adjacent pans and for engagement with the sprocket wheel or other driving means. Preferably, the track is formed such that the pans are closely arranged. In this way, the track provides a substantially continuous bearing surface with which to support the belt. Preferably, the pivotal connections between the pans are selected such that the track can flex in substantially one direction only.
In particular, preferably the pans and/or links are formed to limit the rotation of the pans relative to one another so that the track can flex around the sprocket and idler wheels but is limited in its ability to flex in the opposite direction. In one embodiment, an apron plate extends from at least one of the pans in the track so that the apron plate overlaps at least one of the pans adjacent to the pan to which it is attached. The apron plate establishes continuous support between adjacent pans in the track and limits the rotation of the adjacent pans.
To facilitate frictional engagement between the belt and the track, preferably the upper surface of at least one of the pans is formed to provide enhanced frictional engagement with the belt. In one embodiment, the upper surface of at least one of the pans is formed to releasably engage the belt. Such releasable engagement can be provided by knurling and/or roughening the upper surface of the pan or by the provision of teeth or protrusions on the upper surface of the pan.
In one embodiment, the belt is modified to increase its useful life.
Preferably, a pad is secured to the inner surface of the belt to be in contact with the track.
Preferably, a plurality of pads are secured to the inner surface of the belt, the pads being elongate with a long axis and being spaced apart along the belt with their long axis extending along the width of the belt. The pads are preferably formed of a resilient material such as rubber and are cast integrally with the belt or secured thereto by fasteners, adhesives or other suitable means.
Preferably, the head wheel assembly includes a pair of sprocket wheels and the tail wheel assembly includes a pair of idler wheels which can be separate or formed integral with a drum. The sprocket wheels are preferably driven to rotate simultaneously by the rotary drive system, while the tail wheels and the pulleys of the belt have no connection to a drive means.
Brief Description of the Drawinas A further, detailed, description of the invention, briefly described above, will follow by reference to the following drawings of specific embodiments of the invention.
These drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings:
Figure 1 shows a side elevation view of the material conveyor of the present invention;
Figure 2 shows a plan view of the conveyor of Figure 1;
Figure 3 shows a side elevation view of the drive sprocket of Figure 1, with the support frame removed; and Figure 4 is a sectional view through a belt useful in the present invention.
Detailed Description of the Present Invention Figure 1 shows a side elevation view of a material conveyor 10 according to the present invention. The conveyor includes a conveyor belt 12 on which the material is conveyed and an apron conveyor assembly 14 inside belt 12 which provides structural support for and drives the belt.
Referring also to Figures 2 and 3, apron conveyor assembly 14 includes a continuous track 19 (shown partially in phantom) formed of a plurality of connected pans 20. Each pan 20 is connected, as by fasteners or welding, to a pair of chain links 21.
The chain links are preferably positioned adjacent the sides of the pan. The chain links 21 on adjacent pans are connected, in series, by pivot pins 22 extending though aligned apertures in the links 21 to form a chain similar to a tractor chain. The pans are each formed with an upper surface 26 having an apron plate 26a extending therefrom which is disposed to overlap the upper surface of one of the adjacent pans.
Preferably the upper surface 26 of each pan is formed with an indent 26b which is formed to accommodate the overlapping portion of plate 26a from the adjacent pan so that the upper surface of the track will be substantially flush when the plate 26a overlaps the upper surface of the adjacent pan. Pans 20, links 21 and pins 22 are preferably formed of steel, but can be formed of any other high strength material. The components of the apron conveyor assembly are selected to withstand the loading characteristics of the application to which the material conveyor is to be used.
Continuous track 19 is mounted about a pair of head sprocket wheels 28a and a pair of tail idler wheels 28b. Only one wheel of each pair can be seen in Figures 1 and 3, as they are disposed one behind the other in those views. Links 21 are engaged by the sprockets 29 on wheels 28a. Sprocket wheels 28a are connected to a rotary drive system (not shown), including for example a motor, a reducer and a gear drive, which causes wheels 28a to be driven to rotate. This pair of drive sprocket wheels is connected to rotate at the same speed. Sprocket wheels 28a are, thus, disposed to engage the links and to cause the track to be driven about the sprockets.
Idler wheels 28b preferably guide track 19 thereover, but impart no drive force to the track. The wheels at each end of the track are paired to facilitate movement of track 19.
However, it is to be understood that a track could be used which is mounted on only one head wheel and only one tail wheel.
Track 19 is preferably supported between sprockets wheels 28a, and idler wheels 28b by a plurality of rollers 30. Preferably, rollers 30 extend across the width of the track.
Sprocket wheels 28a, idler wheels 28b and rollers 30 are preferably mounted on a frame 32.
Upper surface 26 of the pans can be modified in any suitable way to frictionally engage the belt 12. In the embodiment shown, an elongate tooth 34 is formed on upper surface 26 of each pan 20. In another embodiment (not shown), at least a portion of the upper surface of at least some pans is knurled or otherwise roughed. In yet another embodiment (not shown), a small protrusion is formed on the surface of at least some of the pans.
Belt 12 is preferably formed as a solid loop so that it will contain wet materials and prevent the wet material from leaking into the apron conveyor and the drive assembly.
To avoid damage to belt 12 by the expanding pans of the drive assembly (i.e.
during the directional change when the track 19 passes around sprockets 28a or 28b), the belt is mounted on head pulley 35a and tail pulley 35b. Pulleys 35a, 35b are spaced outside of sprockets 28a, 28b. Preferably, belt 12 is driven by frictional engagement with the apron conveyor assembly 14 and, thus, pulleys 35a and 35b are idler-type pulleys having no rotary drive systems connected thereto. In the embodiment shown, belt 12 is driven by frictional engagement with elongate teeth 34 on the track.
The pulleys are mounted on frame 32 and, preferably, belt support rollers 38 are provided under the conveying surface of the belt. To provide support to the edges of the belt, the belt should be narrower than the support structures for the belt, including rollers 38 and track 19 where it extends beyond the track of the apron feeder.
Further rollers 39 are provided to guide the belt away from the track on the return portion of the belt cycle.
The belt is formed to withstand the stresses imparted thereon by heavy loading and by frictional contact with track 19. For example, belt is formed of a material and thickness suitable to prevent premature wear or cutting of the belt. In one embodiment, the belt conveyor is formed of heavy, for example solid four-ply rubber, nylon cord and polyester composite conveyor belt having a thickness of between 0.75 and 1.0 inch. In one embodiment, the belt is 5 to 6 feet in width.
In a preferred embodiment, belt 12 has attached on its inner surface a plurality of pads _$_ 40. Pads 40 preferably elongate and extend substantially across the width of the belt.
Because of their thickness (i.e. 2 to 3 inches), the pads are generally rigid across their width. Thus, sufficient space is provided between pads 40 to permit belt 12 to act as a hinge therebetween and, thereby, to permit the belt with the pads attached to bend around the pulleys. Pads 40 facilitate frictional engagement with teeth 34 on apron conveyor. Pads are secured to the belt in any suitable way such as, for example, moulding integrally with the belt, by fasteners such as rivets, screws or bolts or by adhesives.
Referring to Figure 4, in one embodiment pads 40 are formed of moulded rubber.
Preferably, pads 40 are connected to belt 12 by a plurality of bolts 42, for example sixteen bolts spaced along the length of the pad. Each bolt is inserted through alignable apertures 44a, 44b, in the belt and the pad. The bolt is preferably secured in the aperture by a nut 46 and a washer 48 positioned in a countersink hole 49.
Preferably, the washer 48 is cast into the rubber of the pad to facilitate manufacture and to strengthen the connection.
While teeth 34 are shown positioned on the track such that they align with the spaces between pads 40, it is to be understood that this positioning is not necessary to ensure the proper functioning of the conveyor.
In use, conveyor 10 is positioned to convey material from a loading site to a dumping site. The weight of the belt and the positioning of pulleys 35a, 35b causes pads 40 of belt 12 to be in contact with track 19 of the apron conveyor. Sprocket wheels 28a are driven to rotate, in the direction indicated. by arrow A, by the rotary drive system (not shown) which engages and drives track 19 about sprocket wheels 28a and idler wheels 28b. Teeth 34 on upper surface of pans 20 engage pads 40 on belt 12 and cause the belt to move in the direction indicated by arrow B. Material dumped onto belt 12 is conveyed by the conveying surface of belt 12. Preferably, the material is dumped to a position on the belt which is supported below by the track. The belt is supported and _g_ driven by the apron conveyor 14.
It will be apparent that many other changes may be made to the illustrative embodiments, while falling within the scope of the invention and it is intended that all such changes be covered by the claims appended hereto.
These drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings:
Figure 1 shows a side elevation view of the material conveyor of the present invention;
Figure 2 shows a plan view of the conveyor of Figure 1;
Figure 3 shows a side elevation view of the drive sprocket of Figure 1, with the support frame removed; and Figure 4 is a sectional view through a belt useful in the present invention.
Detailed Description of the Present Invention Figure 1 shows a side elevation view of a material conveyor 10 according to the present invention. The conveyor includes a conveyor belt 12 on which the material is conveyed and an apron conveyor assembly 14 inside belt 12 which provides structural support for and drives the belt.
Referring also to Figures 2 and 3, apron conveyor assembly 14 includes a continuous track 19 (shown partially in phantom) formed of a plurality of connected pans 20. Each pan 20 is connected, as by fasteners or welding, to a pair of chain links 21.
The chain links are preferably positioned adjacent the sides of the pan. The chain links 21 on adjacent pans are connected, in series, by pivot pins 22 extending though aligned apertures in the links 21 to form a chain similar to a tractor chain. The pans are each formed with an upper surface 26 having an apron plate 26a extending therefrom which is disposed to overlap the upper surface of one of the adjacent pans.
Preferably the upper surface 26 of each pan is formed with an indent 26b which is formed to accommodate the overlapping portion of plate 26a from the adjacent pan so that the upper surface of the track will be substantially flush when the plate 26a overlaps the upper surface of the adjacent pan. Pans 20, links 21 and pins 22 are preferably formed of steel, but can be formed of any other high strength material. The components of the apron conveyor assembly are selected to withstand the loading characteristics of the application to which the material conveyor is to be used.
Continuous track 19 is mounted about a pair of head sprocket wheels 28a and a pair of tail idler wheels 28b. Only one wheel of each pair can be seen in Figures 1 and 3, as they are disposed one behind the other in those views. Links 21 are engaged by the sprockets 29 on wheels 28a. Sprocket wheels 28a are connected to a rotary drive system (not shown), including for example a motor, a reducer and a gear drive, which causes wheels 28a to be driven to rotate. This pair of drive sprocket wheels is connected to rotate at the same speed. Sprocket wheels 28a are, thus, disposed to engage the links and to cause the track to be driven about the sprockets.
Idler wheels 28b preferably guide track 19 thereover, but impart no drive force to the track. The wheels at each end of the track are paired to facilitate movement of track 19.
However, it is to be understood that a track could be used which is mounted on only one head wheel and only one tail wheel.
Track 19 is preferably supported between sprockets wheels 28a, and idler wheels 28b by a plurality of rollers 30. Preferably, rollers 30 extend across the width of the track.
Sprocket wheels 28a, idler wheels 28b and rollers 30 are preferably mounted on a frame 32.
Upper surface 26 of the pans can be modified in any suitable way to frictionally engage the belt 12. In the embodiment shown, an elongate tooth 34 is formed on upper surface 26 of each pan 20. In another embodiment (not shown), at least a portion of the upper surface of at least some pans is knurled or otherwise roughed. In yet another embodiment (not shown), a small protrusion is formed on the surface of at least some of the pans.
Belt 12 is preferably formed as a solid loop so that it will contain wet materials and prevent the wet material from leaking into the apron conveyor and the drive assembly.
To avoid damage to belt 12 by the expanding pans of the drive assembly (i.e.
during the directional change when the track 19 passes around sprockets 28a or 28b), the belt is mounted on head pulley 35a and tail pulley 35b. Pulleys 35a, 35b are spaced outside of sprockets 28a, 28b. Preferably, belt 12 is driven by frictional engagement with the apron conveyor assembly 14 and, thus, pulleys 35a and 35b are idler-type pulleys having no rotary drive systems connected thereto. In the embodiment shown, belt 12 is driven by frictional engagement with elongate teeth 34 on the track.
The pulleys are mounted on frame 32 and, preferably, belt support rollers 38 are provided under the conveying surface of the belt. To provide support to the edges of the belt, the belt should be narrower than the support structures for the belt, including rollers 38 and track 19 where it extends beyond the track of the apron feeder.
Further rollers 39 are provided to guide the belt away from the track on the return portion of the belt cycle.
The belt is formed to withstand the stresses imparted thereon by heavy loading and by frictional contact with track 19. For example, belt is formed of a material and thickness suitable to prevent premature wear or cutting of the belt. In one embodiment, the belt conveyor is formed of heavy, for example solid four-ply rubber, nylon cord and polyester composite conveyor belt having a thickness of between 0.75 and 1.0 inch. In one embodiment, the belt is 5 to 6 feet in width.
In a preferred embodiment, belt 12 has attached on its inner surface a plurality of pads _$_ 40. Pads 40 preferably elongate and extend substantially across the width of the belt.
Because of their thickness (i.e. 2 to 3 inches), the pads are generally rigid across their width. Thus, sufficient space is provided between pads 40 to permit belt 12 to act as a hinge therebetween and, thereby, to permit the belt with the pads attached to bend around the pulleys. Pads 40 facilitate frictional engagement with teeth 34 on apron conveyor. Pads are secured to the belt in any suitable way such as, for example, moulding integrally with the belt, by fasteners such as rivets, screws or bolts or by adhesives.
Referring to Figure 4, in one embodiment pads 40 are formed of moulded rubber.
Preferably, pads 40 are connected to belt 12 by a plurality of bolts 42, for example sixteen bolts spaced along the length of the pad. Each bolt is inserted through alignable apertures 44a, 44b, in the belt and the pad. The bolt is preferably secured in the aperture by a nut 46 and a washer 48 positioned in a countersink hole 49.
Preferably, the washer 48 is cast into the rubber of the pad to facilitate manufacture and to strengthen the connection.
While teeth 34 are shown positioned on the track such that they align with the spaces between pads 40, it is to be understood that this positioning is not necessary to ensure the proper functioning of the conveyor.
In use, conveyor 10 is positioned to convey material from a loading site to a dumping site. The weight of the belt and the positioning of pulleys 35a, 35b causes pads 40 of belt 12 to be in contact with track 19 of the apron conveyor. Sprocket wheels 28a are driven to rotate, in the direction indicated. by arrow A, by the rotary drive system (not shown) which engages and drives track 19 about sprocket wheels 28a and idler wheels 28b. Teeth 34 on upper surface of pans 20 engage pads 40 on belt 12 and cause the belt to move in the direction indicated by arrow B. Material dumped onto belt 12 is conveyed by the conveying surface of belt 12. Preferably, the material is dumped to a position on the belt which is supported below by the track. The belt is supported and _g_ driven by the apron conveyor 14.
It will be apparent that many other changes may be made to the illustrative embodiments, while falling within the scope of the invention and it is intended that all such changes be covered by the claims appended hereto.
Claims (13)
1. A material conveyor comprising:
a conveyor assembly including a continuous track formed of pivotally connected pans, each pan being rigid and having an upper surface, the track being mounted on and engaged by a head wheel assembly and a tail wheel assembly, at least one of the head wheel assembly and the tail wheel assembly being driven to rotate by a rotary drive means to drive the track about the wheels; and, a conveyor belt formed as a continuous loop having an inner surface and an outer surface and being mounted on a head pulley and a tail pulley, the conveyor belt being disposed about the apron conveyor such that at least a portion of the inner surface of the belt can be brought into contact with the apron conveyor, such that when the track is driven around the head wheel assembly and the tail wheel assembly, the belt is driven by frictional contact with the track around the pulleys.
a conveyor assembly including a continuous track formed of pivotally connected pans, each pan being rigid and having an upper surface, the track being mounted on and engaged by a head wheel assembly and a tail wheel assembly, at least one of the head wheel assembly and the tail wheel assembly being driven to rotate by a rotary drive means to drive the track about the wheels; and, a conveyor belt formed as a continuous loop having an inner surface and an outer surface and being mounted on a head pulley and a tail pulley, the conveyor belt being disposed about the apron conveyor such that at least a portion of the inner surface of the belt can be brought into contact with the apron conveyor, such that when the track is driven around the head wheel assembly and the tail wheel assembly, the belt is driven by frictional contact with the track around the pulleys.
2. The material conveyor of claim 1 wherein the conveyor is disposed within the loop of the belt and the head wheel assembly and tail wheel assembly are positioned in the space between the head pulley and the tail pulley.
3. The material conveyor of claim 1 wherein the head wheel assembly includes a sprocket wheel and the tail wheel assembly includes an idler wheel.
4. The material conveyor of claim 1 wherein the pans of the track are rigid.
5. The material conveyor of claim 1 wherein the pans are formed of steel.
6. The material conveyor of claim 1 wherein the pans are closely arranged and connected such that the track provides a substantially continuous bearing surface with which to support the belt.
7. The material conveyor of claim 1 wherein the track is selected such that it can flex in substantially only one direction.
8. The material conveyor of claim 1 wherein an apron plate extends from at least one of the pans, the apron plate being formed to overlap at least one adjacent pan.
9. The material conveyor of claim 1 wherein the upper surface of at least one of the pans is formed to releasably engage the belt.
10. The material conveyor of claim 9 wherein the upper surface of at least one of the pans has formed thereon a protruding tooth.
11. The material conveyor of claim 1 wherein a pad is secured to the inner surface of the belt to be in contact with the track.
12. The material conveyor of claim 1 wherein the pad is formed of a resilient material.
13. The invention as described in any of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2238540 CA2238540A1 (en) | 1998-05-25 | 1998-05-25 | Material conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2238540 CA2238540A1 (en) | 1998-05-25 | 1998-05-25 | Material conveyor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2238540A1 true CA2238540A1 (en) | 1999-11-25 |
Family
ID=29275779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2238540 Abandoned CA2238540A1 (en) | 1998-05-25 | 1998-05-25 | Material conveyor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2238540A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH708428A1 (en) * | 2013-08-12 | 2015-02-13 | Wrh Walter Reist Holding Ag | Conveyor with a two-dimensionally extended conveyor member. |
| RU2613947C1 (en) * | 2016-06-03 | 2017-03-22 | Александр Алексеевич Реутов | Belt conveyor intermediate linear drive |
| US10189647B2 (en) | 2013-02-01 | 2019-01-29 | Thyssenkrupp Industrial Solutions (Usa), Inc. | Belt-on-belt drives for steeply-sloped portions of long conveyors |
| CN110641922A (en) * | 2018-06-27 | 2020-01-03 | 刘素华 | Positioning annular belt for penetrating head and tail convex side strips |
-
1998
- 1998-05-25 CA CA 2238540 patent/CA2238540A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10189647B2 (en) | 2013-02-01 | 2019-01-29 | Thyssenkrupp Industrial Solutions (Usa), Inc. | Belt-on-belt drives for steeply-sloped portions of long conveyors |
| CH708428A1 (en) * | 2013-08-12 | 2015-02-13 | Wrh Walter Reist Holding Ag | Conveyor with a two-dimensionally extended conveyor member. |
| US9694983B2 (en) | 2013-08-12 | 2017-07-04 | Wrh Walter Reist Holding Ag | Conveying device with an extensively extended conveying element |
| RU2613947C1 (en) * | 2016-06-03 | 2017-03-22 | Александр Алексеевич Реутов | Belt conveyor intermediate linear drive |
| CN110641922A (en) * | 2018-06-27 | 2020-01-03 | 刘素华 | Positioning annular belt for penetrating head and tail convex side strips |
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| Date | Code | Title | Description |
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| FZDE | Dead |