CA2109769C - Tubular belt conveyor - Google Patents
Tubular belt conveyorInfo
- Publication number
- CA2109769C CA2109769C CA 2109769 CA2109769A CA2109769C CA 2109769 C CA2109769 C CA 2109769C CA 2109769 CA2109769 CA 2109769 CA 2109769 A CA2109769 A CA 2109769A CA 2109769 C CA2109769 C CA 2109769C
- Authority
- CA
- Canada
- Prior art keywords
- belt
- conveyor
- roller
- rollers
- tubular
- 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 - Fee Related
Links
Classifications
-
- 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
- B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors
- B65G39/10—Arrangements of rollers
- B65G39/12—Arrangements of rollers mounted on framework
- B65G39/125—Arrangements of rollers mounted on framework for selectively adjusting troughing of the conveying belt
-
- 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
- B65G15/08—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 the load-carrying surface being formed by a concave or tubular belt, e.g. a belt forming a trough
-
- 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
Abstract
A tubular belt conveyor includes an endless belt wound around a driving roller and a driven roller mounted at opposite ends of the conveyor. An upper section of the belt constitutes an out-going belt and a lower section of the belt constitutes a return belt, both of which are supported by a plurality of supporting frames. Deformation rollers provided near the driving and driven rollers deform both the out-going and return belts into a tubular form, which extends substantially along the entire length of the conveyor, so that materials to be conveyed are effectively wrapped in the out-going belt, and are conveyed in the wrapped condition. Guiding rollers located proximal the edges of both the out-going and return belts include pressing rollers comprised of a plurality of rollers elements, each of which can rotate independently.
Description
CA21 097~q The present invention relates to an endless belt conveyor which is formed into a tubular shape to convey materials such as powered/grained materials in an enclosed condition, and in particular to an endless tubular belt in which the edges are overlapped smoothly and which is provided with holding rollers for holding the endless belt in as near to a tubular shape as is possible, so that sagging and twisting of the belt during running operation is prevented.
In a conventional tubular belt conveyor, materials to be conveyed are deposited on a flattened part of an out-going portion of the conveyor belt, usually near the driven roller. In order to form the flattened portion into a tubular shape, the edges of the belt are caused to overlap each other as the outgoing belt moves away from the driven roller. However, at the point at which the two edges of the belt overlap, various problems such as distortion, twisting etc. are likely to occur. Accordingly, in conventional belt conveyors, a pressing roller 40 (see Figure 16), which presses one of the edges of the belt 41 downwards, has customarily been employed to reduce these problems. As illustrated in Figure 16, by locating a pressing roller 40 close to the point at which the two edges cross, collisions between the two edges can be avoided. However, under these circumstances, side-to-side movements of the belt 41, as shown by the arrows in Figure 16, can result in slippage and/or uneven distribution of materials wrapped in the belt , , , ~, 41. Additionally, as shown by the dashed line in Figure 16, in conventional belt conveyors, the free edge of the belt 41 frequently contacts the top of the pressing roller 40 (typically near the distal end thereof), while the other edge of the belt 41 presses against the underside of the pressing roller (usually in a longitudinally intermediate portion of the roller). As a result, the frictional force acting on the top of the roller 40 is in a direction opposite to that of the force which acts on the underside thereof, effectively braking the rotation of the roller 40.
The resulting friction and slippage between the pressing roller 40 and the two edges of the belt 41 leads to premature wear of both the roller 40 and the belt 41.
In order to avoid this problem, the pressing roller 40 can be placed at a location remote from the point at which the two edges cross, so that the two edges are widely separated. However, under these conditions the belt 41 can become unduly flattened, which prevents the endless belt 41 from being smoothly rounded.
Another disadvantage of the conventional tubular belt conveyor is that twisting and distortion of the belt 41 can also be caused by changes in the position of materials wrapped in the tubular belt conveyor, and further by differences in resistance generated between the running belt conveyor and each of the holding rollers 42. In order to correct this twisting and distortion, a correcting roller 43 is typically provided as shown in Figure 17. However, since .~
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the correcting roller 43 is installed to correct the twisting and distortion while the belt conveyor is stopped, which is different from correcting the same problem during running of the belt conveyor, an appropriate correction can not be expected.
In addition, in the conventional tubular belt conveyor, a plurality of holding rollers 42 are separately mounted to form a hexagonal shape surrounding the belt.
Since this hexagonal shape differs substantially from a more nearly circular shape, large resistance forces are generated during running operation, which prevents the belt conveyor from running smoothly.
Japanese Patent laid-open Publication 57-141304 discloses a tubular belt conveyor which also corrects the twisting motion of the belt conveyor about an axial direction thereof. However, in reality, during running operation a belt will tend to twist at random locations.
Therefore, to prevent the belt conveyor of this publication from being twisted it is necessary to provide a correcting device to each of supporting frames, as illustrated in Figures 17a-b.
In the tubular belt conveyor, twists about the axis which are generated during running operation can occur in several, generally random, locations along the belt.
Accordingly, it is difficult to select in advance positions at which the twist preventing means, such as the pressing roller as described above, should be set. Therefore, the .~
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twist preventing means must be provided on all of the supporting frames, which means that neither the number of the supporting frames nor the number of the twist preventing means can be reduced, which is very wasteful. Further, the provision of the twist preventing means is of no use in preventing the tubular belt from sagging.
The present invention is directed to overcoming many of the above-described drawbacks associated with the prior art. Thus an object of the present invention is to provide an economic tubular belt conveyor in which the twisting of the tubular belt can be properly corrected and sagging of the belt between the supporting frames can also be prevented, and in which the space between the supporting frames can be widened, so as to reduce the number of the supporting rollers.
In order to achieve the above mentioned objects, according to the present invention, there is provided a tubular belt conveyor comprising: a driving roller disposed at one end of the conveyor; a driven roller disposed at the other end of the conveyor; an endless conveyor belt wound around driving and driven rollers, an upper section of the belt defining an outgoing belt and a lower section of the belt defining a return belt; a plurality of primary support frames substantially evenly spaced along the conveyor for supporting the outgoing and return belts; deformation means disposed proximal each of the driving and driven rollers, for deforming both of the outgoing and return belts into a ..~
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tubular shape, the outgoing and return belts being flattened to pass around the driving and driven rollers, whereby materials to be conveyed are placed on a flattened portion of the outgoing belt prior to deformation of the outgoing belt into a tubular shape by the deforming means, and the materials are conveyed in the wrapped condition; and guiding means disposed near the deformation means for guiding the edges of both the outward and return belts, the guiding means including at least one pressing roller comprising two or more respective roller elements disposed along a common axis, each roller element being independently rotatable with respect to adjacent roller elements.
In an embodiment of the present invention, the pressing roller is located proximal a location where the opposite edges of the belt intersect and overlap.
Preferably, the pressing roller presses on one of the edges of the belt, so as to force that edge under the other edge of the belt. In one embodiment of the invention, the pressing roller includes and inboard roller element for pressing on an edge of the belt, and an outboard roller element for contacting the other edge of the belt. Since the inboard and outboard roller elements are independently mounted, the can readily rotate in opposite directions under the frictional forced imposed on them by the respective edges of the belt. In another embodiment of the present invention, the pressing roller comprises a plurality of narrow roller elements, each of which are independently ,.~p ~-- CA21097~9 mounted for rotation. This arrangement increases flexibility, and allows the pressing roller to function properly even if the edges of the belt shift laterally during operation of the conveyor.
In an embodiment of the present invention, each of the primary support frames includes an upper passage through which the outgoing belt passes, and a lower passage through which the return belt passes, the upper and lower passages including a plurality of respective support rollers arranged in an polygonal configuration. Preferably, six support rollers arranged in a hexagonal configuration are used. In this case, the support rollers of one primary support frame are rotated with respect to the support rollers of the adjacent primary support frames. This prevents the belt from adopting the overall shape of the support rollers, and thus ensures that the belt retains a smoothly rounded shape.
In an embodiment of the present invention, secondary support rollers are arranged horizontally under the outgoing and return belts, approximately midway between each of the primary support frames. The secondary support rollers serve to prevent sagging of the belt between the primary support frames. Preferably, the angle of the secondary support rollers, with respect to the running direction of the belt, can be adjusted. This allows the secondary support rollers to also serve to counteract any twisting of the belt. Preferably, the angle of the secondary support roller can be adjusted while the belt is ~ 3 ~9~6~
running, so that any twisting of the belt can be accurately corrected, without interrupting operation of the conveyor.
In an embodiment of the present invention, when the conveyor follows a transversely bent path, vertically oriented bending rollers are arranged close to the secondary support rollers, on the inside of transversely bent portion of the belt. The bending rollers serve to maintain the running belt in a smoothly bending path between the primary support frames. Preferably, the angle of the bending rollers, with respect to the running direction of the belt, can be adjusted. This allows the bending rollers to also serve to counteract any twisting of the belt. Preferably, the angle of the bending rollers can be adjusted while the belt is running, so that any twisting of the belt can be accurately corrected, without interrupting operation of the conveyor. By this means, in the bent portion of the conveyor, both secondary support rollers and bending rollers can be used to counteract twisting of the belt.
The invention will be more readily understood from the following description of a preferred embodiment thereof given, by way of example, with reference to the accompanying drawings, in which:
Figure 1 shows a side view of a tubular belt conveyor according to an embodiment of the present invention;
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Figure 2 shows a plan view of a tubular belt conveyor according to an embodiment of the present invention;
Figure 3 shows a front view of an upper half of a pressing frame illustrating a pressing roller in accordance with an aspect of the present invention;
Figure 4 shows a longitudinal cross-section view of the pressing roller illustrated in Figure 3;
Figure 5 shows a partial cross-section view of another pressing roller in accordance with an aspect of the present invention;
Figure 6a shows a cross-section view of the tubular belt conveyor cut along line V - V shown in Figure l;
Figure 6b shows a cross-sectional view of the tubular belt conveyor cut along line VI - VI shown in Figure l;
Figure 7 shows a perspective view of a portion of a belt conveyor according to the present invention, showing a four successive sets of primary supporting rollers;
Figure 8 shows a side view of a tubular belt conveyor in accordance with a second embodiment of the present invention;
Figure 9 shows a plan view of the tubular belt conveyor of Figure 8;
Figure 10 shows a cross-section view of the tubular belt conveyor of Figure 8, cut along line A - A;
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Figure 11 shows a cross-section view taken along line B - B in Figure 8;
Figure 12 shows a plan view seen from a direction of line D - D in Figure 11;
Figure 13 shows a cross-section view taken along line C - C in Figure 8;
Figure 14 shows a plan view of a portion of the belt conveyor of figure 9;
Figure 15 is a side view seen from a direction of the line E - E in Figure 14.
Figure 16 shows a cross-section view of a conventional tubular belt conveyor, illustrating a conventional pressing roller;
Figure 17a shows a partial cross-sectional plan view of a twist preventing device of a conventional tubular belt conveyor; and Figure 17b shows a partial cross-sectional side view of the twist preventing device shown in Figure 17a.
Figures 1 and 2 respectively show side and plan views of an embodiment of a tubular belt conveyor according to the present invention. The conveyor generally comprises an endless belt 2 composed of flexible material which extends along the length of the conveyor 1 and around a drive roller 3 and a driven roller 4. As illustrated in Figures 1 and 2, the conveyor 1 is divided into two transition zones 7a located at opposite ends of the ~, CA21 Oq769 conveyor 1, and an intermediate zone extending between the transition zone. Within the intermediate zone, which makes up most of the length of the conveyor 1, the endless belt 2 is maintained in a substantially tubular shape. Within the two transition zones, the belt 2 transitions from the tubular shape of the intermediate zone to a flat shape as it passes around the drive and driven rollers 3 and 4. Within the intermediate zone, the belt 2 is supported by primary support rollers 5 operatively mounted on primary support frames 6 disposed at predetermined intervals along the length of the conveyor 1. The transition zones 7a, 7b are defined between each of the drive and driven rollers 3, 4, and the nearest primary support frame 6, in which the belt 2 is deformed from a flattened shape into a substantially tubular shape, and vis-a-verse. In order to support the belt 2 within each transition zone 7a, 7b, and to assist in the smooth deformation of the belt 2, one or more sets of transition rollers 8 are provided on suitable transition support frames 9. A pressing frame 10 having a pressing roller 11 is provided within each transition zone 7a, 7b to ensure that the opposite edges 2a, 2b of the endless belt 2 overlap each other smoothly.
In operation, the drive roller 3, which is driven by a suitable drive means (not shown), frictionally engages the endless belt 2 and causes the belt 2 to run continuously in the direction of the arrows in Figure 1. As illustrated in Figure 1, the belt 2 passes around the driven roller 4 't~
~ CA21 ~97b9 and into a transition zone 7a in which the belt is gradually deformed by the transition rollers 8 and pressing rollers 11 until the edges 2a, 2b of the belt 2 overlap to define a tubular shape. Within the transition zone 7a, a hoper 12 deposits material to be transported 13 onto the belt 2. By this means, the material 13 is substantially enclosed by the belt 2 shortly after being deposited on the belt 2. The material 13 is transported along the length of the conveyor 1, in a substantially enclosed condition, to the transition zone 7b near the drive roller 3. As the belt 2 approaches the drive roller 3, the transition rollers 8 cause the belt 2 to smoothly transition to a flattened condition, thereby effectively "unwrapping" the material 13 being transported.
As the belt 2 passes around the drive roller 3, the material 13 is deposited from the belt 2 into a receiving tub 14.
From the drive roller 3, the belt passes through the transition zone 7b and returns to the driven roller 4 in a tubular condition. One or more tensioning or idler rollers 15 can be provided near the drive roller 3 to adjust belt tension and/or the angle of engagement between the belt 2 and the drive roller 3.
In the remaining discussion, the portion of the belt 2 travelling from the driven roller 4 to the drive roller 3, and on which the material 13 is transported, will be referred to as the outgoing belt 2'. Conversely, the portion of the belt 2 travelling from the driven roller 4 to .~
~ CA21 09769 the drive roller 3 will be referred to as the return belt 2''.
Figure 3 illustrates a portion of a pressing frame 10 disposed in the transition zone 7a near the driven roller 4. The pressing frame 10 is divided into an upper passage through which the outgoing belt 2' passes, and a lower passage (not shown), through which the return belt 2'' passes. The pressing frame 10 is located in the transition zone 7a, at or near the point at which the opposite edges 2a, 2b of the outgoing belt 2' overlap. The pressing roller 11 is composed of an inboard roller unit 16, and an outboard roller unit 17, both of which are independently mounted on bearings for rotation about a common shaft 18 (see Figure 4). The shaft 18 is conveniently affixed (for example by welding) to a mounting plate 19 having a plurality of mounting plate slots 20. A corresponding mounting bracket 21 affixed to the pressing frame 10 is provided with a plurality of mounting bracket slots 22, whereby the pressing roller can be conveniently affixed to the pressing frame by means of bolts passing through the slots 20 and 22.
Preferably, the slots 20 of the pressing roller mounting plate 19 are provided at right-angles to the slots 22 of the mounting bracket 21, so that the angle and the position (in both the vertical and lateral directions) of the pressing roller can be adjusted.
The pressing roller 11 is mounted so that the inboard roller unit 16 applies pressure to a first edge 2a ,.~
C~21 09769 of the belt 2' while the opposite edge 2b is being guided over it. At this point, the opposite edge 2b tends to drop (due to gravity and tension within the belt) onto the upper portion of the pressing roller 11, and contacts the outboard roller unit 17. Since the two roller units 16, 17 are independently mounted, they can rotate freely in opposite directions due to friction with the respective edges 2a, 2b of the belt 2', thereby minimizing frictional forces between the pressing roller 11 and the opposite edges 2a-b of the belt 2'.
In cases where the specific gravity of the material 13 being conveyed is large, it is preferable to support the belt 2' by means of a plurality of receiving rollers 23 operatively mounted to the pressing frame 10 as shown in dotted lines in Figure 3.
During running operation of the conveyor 1, the specific locations of the edges 2a, 2b of the belt 2' can change. As a result of this, it can be difficult to predict the best position of the pressing roller 11 so that one edge 2a contacts only the inboard roller unit 16, while the other edge 2b contacts only the outboard roller unit 17. Figure 5 illustrates an embodiment of the pressing roller 11 which substantially overcomes this difficulty. In this embodiment, the inboard and outboard roller units 16, 17 are replaced by a plurality of narrow roller units 24, each of which are independently mounted on bearings for rotation about the common shaft 18. This arrangement provides maximum flexibility in the placement of the pressing roller 11, and allows the edges 2a, 2b of the belt 2' to move during operation of the belt, while the probability of both edges simultaneously engaging the same roller unit 23 is minimized.
As mentioned previously, the endless belt 2 is substantially tubular in shape along most of the length of the conveyor 1, and transitions to a flat shape at either end of the conveyor 1 (i.e. as it passes around the drive and driven rollers 3 and 4). Between the transition zones 7a, 7b, the belt 2 is maintained in a tubular condition, and is supported by primary support rollers 5 operatively mounted on primary support frames 6 disposed at predetermined intervals along the length of the conveyor 1.
lS Each primary support frame 6 is provided with an upper passage through which the outgoing belt 2' passes, and a lower passage through which the return belt 2'' passes.
A respective set of primary support rollers 5 is operatively disposed within each of the upper and lower passages of the primary support frame 6. As illustrated in Figures 6a and 6b, each set of primary support rollers 5 comprises a plurality of rollers 5a-f which are arranged to form a polygonal configuration surrounding the belt 2 on all sides.
Figures 6a and 6b show two orientations of the primary support rollers 5a-f within the primary support frame 6 (i.e. hexagonal arrangements rotated 30~ with respect to each other). In order to maintain the belt 2 in ~ CA2 1.3~7~9 as close to a cylindrical shape as possible, it is preferable to alternately use both orientations in successive support frames along the length of the conveyor 1. Thus the orientations of the primary support rollers 5 will preferably alternate along the length of the conveyor 1 in the manner illustrated in Figure 7.
The primary support frames 6 are conveniently supported and linked longitudinally by structural elements 25 extending along substantially the whole length of the conveyor 1. Conveniently, through most of the length of the conveyor 1, the spaces between the primary support frames 6 will be substantially equal. However, in order to ensure a smooth entry (and exit) of the tubular belt 2 into (and from) the transition zones 7a-b, the spaces between the primary support frames 6 can advantageously be reduced near the transition zones 7a-b.
Next, torsion correcting means for appropriately correcting twisting phenomenon of the tubular belt conveyor and means for reducing the number of supporting rollers according to the present invention will be described.
Figures 9 and 10 generally show an example of the tubular belt conveyor according to the present invention.
In the side view of Figure 9 the tubular belt conveyor 1 is shown linearly inclined from the driven roller 4 end toward the driving roller 3 end. On the other hand, in the plan view of Figure 10 the conveyor 1 is shown partially curved in a transverse direction. In other respects, the general lay-out and operation of the conveyor 1 is similar to that Figure 1, and thus will not be discussed in further detail here.
As shown in Figure 11, in this example the supporting frame 6 is partitioned into upper and lower sections by a central partition member 6a, and central longitudinal structural elements 26 are mounted in the vicinity of the partition 6a in addition to the structural elements 25 described above.
Figure 12a shows a cross-sectional view through the conveyor 1 at a location approximately midway between successive primary support frames 6, within a straight portion of the conveyor 1. A horizontally disposed secondary support roller 27 supports the outgoing belt 2', and is mounted on secondary support brackets 28, which are in turn affixed to the central longitudinal structural elements 26. A similar secondary support roller 27 supports the return belt 2'', and is mounted on support brackets 28a affixed to the structural elements 25. The secondary support rollers 27, 27a serve to support the belt 2 between the primary support rollers 5. This helps prevent sagging of the belt, and allows the support frames to be spaced further apart (for example, a conventional spacing of 1.5m can be increased to approximately 2.0 to 2.5m).
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In order to correct undesired twisting of the belt 2, the brackets 28, 28a supporting the secondary support rollers 27 are affixed to the structural elements 25, 26 by means of mounting bolts 29. The mounting brackets 28, 28a are provided with elongated mounting slots 30, as illustrated in Figure 13, through which the mounting bolts 29 pass. By means of the elongated mounting slots 30, the angle of the secondary support rollers 27, can be adjusted with respect to the direction of travel of the belt 2, as shown in Figure 13. As the belt 2 runs over the angled roller 27, a twisting force F produced by friction between the belt 2 and the roller 27 is applied to the belt 2 in a direction determined by the direction of the angle of the roller 27. Thus during operation of the conveyor 1, any twist in the belt at a particular location can be corrected by suitably adjusting the angle of the supporting roller 27 nearest to that location, without interrupting the running operation of the conveyor 1.
Figure 14 shows a cross-sectional view through the conveyor 1 at a location approximately midway between successive primary support frames 6, within a curved portion of the conveyor 1. In addition to the horizontally arranged secondary support rollers 27, vertical bending rollers 31 are mounted on respective bending roller support brackets 32 affixed to the structural elements 25, 26. As shown in Figure 15, the bending rollers 31 are located on the inside of the curve of the belt 2, and helps to maintain a smooth .~
curve in the belt as it moves through the bend. In Figure 15, the solid and dashed lines respectively indicate the path of the belt 2 with and without the bending roller 31.
By maintaining a smoothly rounded curve between the primary support frames, the bending roller 31 reduces the running resistance of the belt 2.
The vertical bending rollers 31 are preferably mounted in a manner similar to that of the secondary support rollers 27. This allows the angle of the bending rollers 31 to be adjusted as shown in Figure 16. Thus in the curved portions of the conveyor 1, both the secondary support rollers 27 and the ending rollers 31 can be used to counteract any tendency of the belt 2 to twist. This allows any twisting tendency of the belt to be accurately counteracted,without interrupting running operation of the conveyor.
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited thereto and many variations and modifications of the invention can be practised upon consideration of the foregoing disclosure without departing from the scope and spirit of the appended claims.
In a conventional tubular belt conveyor, materials to be conveyed are deposited on a flattened part of an out-going portion of the conveyor belt, usually near the driven roller. In order to form the flattened portion into a tubular shape, the edges of the belt are caused to overlap each other as the outgoing belt moves away from the driven roller. However, at the point at which the two edges of the belt overlap, various problems such as distortion, twisting etc. are likely to occur. Accordingly, in conventional belt conveyors, a pressing roller 40 (see Figure 16), which presses one of the edges of the belt 41 downwards, has customarily been employed to reduce these problems. As illustrated in Figure 16, by locating a pressing roller 40 close to the point at which the two edges cross, collisions between the two edges can be avoided. However, under these circumstances, side-to-side movements of the belt 41, as shown by the arrows in Figure 16, can result in slippage and/or uneven distribution of materials wrapped in the belt , , , ~, 41. Additionally, as shown by the dashed line in Figure 16, in conventional belt conveyors, the free edge of the belt 41 frequently contacts the top of the pressing roller 40 (typically near the distal end thereof), while the other edge of the belt 41 presses against the underside of the pressing roller (usually in a longitudinally intermediate portion of the roller). As a result, the frictional force acting on the top of the roller 40 is in a direction opposite to that of the force which acts on the underside thereof, effectively braking the rotation of the roller 40.
The resulting friction and slippage between the pressing roller 40 and the two edges of the belt 41 leads to premature wear of both the roller 40 and the belt 41.
In order to avoid this problem, the pressing roller 40 can be placed at a location remote from the point at which the two edges cross, so that the two edges are widely separated. However, under these conditions the belt 41 can become unduly flattened, which prevents the endless belt 41 from being smoothly rounded.
Another disadvantage of the conventional tubular belt conveyor is that twisting and distortion of the belt 41 can also be caused by changes in the position of materials wrapped in the tubular belt conveyor, and further by differences in resistance generated between the running belt conveyor and each of the holding rollers 42. In order to correct this twisting and distortion, a correcting roller 43 is typically provided as shown in Figure 17. However, since .~
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the correcting roller 43 is installed to correct the twisting and distortion while the belt conveyor is stopped, which is different from correcting the same problem during running of the belt conveyor, an appropriate correction can not be expected.
In addition, in the conventional tubular belt conveyor, a plurality of holding rollers 42 are separately mounted to form a hexagonal shape surrounding the belt.
Since this hexagonal shape differs substantially from a more nearly circular shape, large resistance forces are generated during running operation, which prevents the belt conveyor from running smoothly.
Japanese Patent laid-open Publication 57-141304 discloses a tubular belt conveyor which also corrects the twisting motion of the belt conveyor about an axial direction thereof. However, in reality, during running operation a belt will tend to twist at random locations.
Therefore, to prevent the belt conveyor of this publication from being twisted it is necessary to provide a correcting device to each of supporting frames, as illustrated in Figures 17a-b.
In the tubular belt conveyor, twists about the axis which are generated during running operation can occur in several, generally random, locations along the belt.
Accordingly, it is difficult to select in advance positions at which the twist preventing means, such as the pressing roller as described above, should be set. Therefore, the .~
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twist preventing means must be provided on all of the supporting frames, which means that neither the number of the supporting frames nor the number of the twist preventing means can be reduced, which is very wasteful. Further, the provision of the twist preventing means is of no use in preventing the tubular belt from sagging.
The present invention is directed to overcoming many of the above-described drawbacks associated with the prior art. Thus an object of the present invention is to provide an economic tubular belt conveyor in which the twisting of the tubular belt can be properly corrected and sagging of the belt between the supporting frames can also be prevented, and in which the space between the supporting frames can be widened, so as to reduce the number of the supporting rollers.
In order to achieve the above mentioned objects, according to the present invention, there is provided a tubular belt conveyor comprising: a driving roller disposed at one end of the conveyor; a driven roller disposed at the other end of the conveyor; an endless conveyor belt wound around driving and driven rollers, an upper section of the belt defining an outgoing belt and a lower section of the belt defining a return belt; a plurality of primary support frames substantially evenly spaced along the conveyor for supporting the outgoing and return belts; deformation means disposed proximal each of the driving and driven rollers, for deforming both of the outgoing and return belts into a ..~
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tubular shape, the outgoing and return belts being flattened to pass around the driving and driven rollers, whereby materials to be conveyed are placed on a flattened portion of the outgoing belt prior to deformation of the outgoing belt into a tubular shape by the deforming means, and the materials are conveyed in the wrapped condition; and guiding means disposed near the deformation means for guiding the edges of both the outward and return belts, the guiding means including at least one pressing roller comprising two or more respective roller elements disposed along a common axis, each roller element being independently rotatable with respect to adjacent roller elements.
In an embodiment of the present invention, the pressing roller is located proximal a location where the opposite edges of the belt intersect and overlap.
Preferably, the pressing roller presses on one of the edges of the belt, so as to force that edge under the other edge of the belt. In one embodiment of the invention, the pressing roller includes and inboard roller element for pressing on an edge of the belt, and an outboard roller element for contacting the other edge of the belt. Since the inboard and outboard roller elements are independently mounted, the can readily rotate in opposite directions under the frictional forced imposed on them by the respective edges of the belt. In another embodiment of the present invention, the pressing roller comprises a plurality of narrow roller elements, each of which are independently ,.~p ~-- CA21097~9 mounted for rotation. This arrangement increases flexibility, and allows the pressing roller to function properly even if the edges of the belt shift laterally during operation of the conveyor.
In an embodiment of the present invention, each of the primary support frames includes an upper passage through which the outgoing belt passes, and a lower passage through which the return belt passes, the upper and lower passages including a plurality of respective support rollers arranged in an polygonal configuration. Preferably, six support rollers arranged in a hexagonal configuration are used. In this case, the support rollers of one primary support frame are rotated with respect to the support rollers of the adjacent primary support frames. This prevents the belt from adopting the overall shape of the support rollers, and thus ensures that the belt retains a smoothly rounded shape.
In an embodiment of the present invention, secondary support rollers are arranged horizontally under the outgoing and return belts, approximately midway between each of the primary support frames. The secondary support rollers serve to prevent sagging of the belt between the primary support frames. Preferably, the angle of the secondary support rollers, with respect to the running direction of the belt, can be adjusted. This allows the secondary support rollers to also serve to counteract any twisting of the belt. Preferably, the angle of the secondary support roller can be adjusted while the belt is ~ 3 ~9~6~
running, so that any twisting of the belt can be accurately corrected, without interrupting operation of the conveyor.
In an embodiment of the present invention, when the conveyor follows a transversely bent path, vertically oriented bending rollers are arranged close to the secondary support rollers, on the inside of transversely bent portion of the belt. The bending rollers serve to maintain the running belt in a smoothly bending path between the primary support frames. Preferably, the angle of the bending rollers, with respect to the running direction of the belt, can be adjusted. This allows the bending rollers to also serve to counteract any twisting of the belt. Preferably, the angle of the bending rollers can be adjusted while the belt is running, so that any twisting of the belt can be accurately corrected, without interrupting operation of the conveyor. By this means, in the bent portion of the conveyor, both secondary support rollers and bending rollers can be used to counteract twisting of the belt.
The invention will be more readily understood from the following description of a preferred embodiment thereof given, by way of example, with reference to the accompanying drawings, in which:
Figure 1 shows a side view of a tubular belt conveyor according to an embodiment of the present invention;
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Figure 2 shows a plan view of a tubular belt conveyor according to an embodiment of the present invention;
Figure 3 shows a front view of an upper half of a pressing frame illustrating a pressing roller in accordance with an aspect of the present invention;
Figure 4 shows a longitudinal cross-section view of the pressing roller illustrated in Figure 3;
Figure 5 shows a partial cross-section view of another pressing roller in accordance with an aspect of the present invention;
Figure 6a shows a cross-section view of the tubular belt conveyor cut along line V - V shown in Figure l;
Figure 6b shows a cross-sectional view of the tubular belt conveyor cut along line VI - VI shown in Figure l;
Figure 7 shows a perspective view of a portion of a belt conveyor according to the present invention, showing a four successive sets of primary supporting rollers;
Figure 8 shows a side view of a tubular belt conveyor in accordance with a second embodiment of the present invention;
Figure 9 shows a plan view of the tubular belt conveyor of Figure 8;
Figure 10 shows a cross-section view of the tubular belt conveyor of Figure 8, cut along line A - A;
i ~ 8 ~ CA2~ ~976~
Figure 11 shows a cross-section view taken along line B - B in Figure 8;
Figure 12 shows a plan view seen from a direction of line D - D in Figure 11;
Figure 13 shows a cross-section view taken along line C - C in Figure 8;
Figure 14 shows a plan view of a portion of the belt conveyor of figure 9;
Figure 15 is a side view seen from a direction of the line E - E in Figure 14.
Figure 16 shows a cross-section view of a conventional tubular belt conveyor, illustrating a conventional pressing roller;
Figure 17a shows a partial cross-sectional plan view of a twist preventing device of a conventional tubular belt conveyor; and Figure 17b shows a partial cross-sectional side view of the twist preventing device shown in Figure 17a.
Figures 1 and 2 respectively show side and plan views of an embodiment of a tubular belt conveyor according to the present invention. The conveyor generally comprises an endless belt 2 composed of flexible material which extends along the length of the conveyor 1 and around a drive roller 3 and a driven roller 4. As illustrated in Figures 1 and 2, the conveyor 1 is divided into two transition zones 7a located at opposite ends of the ~, CA21 Oq769 conveyor 1, and an intermediate zone extending between the transition zone. Within the intermediate zone, which makes up most of the length of the conveyor 1, the endless belt 2 is maintained in a substantially tubular shape. Within the two transition zones, the belt 2 transitions from the tubular shape of the intermediate zone to a flat shape as it passes around the drive and driven rollers 3 and 4. Within the intermediate zone, the belt 2 is supported by primary support rollers 5 operatively mounted on primary support frames 6 disposed at predetermined intervals along the length of the conveyor 1. The transition zones 7a, 7b are defined between each of the drive and driven rollers 3, 4, and the nearest primary support frame 6, in which the belt 2 is deformed from a flattened shape into a substantially tubular shape, and vis-a-verse. In order to support the belt 2 within each transition zone 7a, 7b, and to assist in the smooth deformation of the belt 2, one or more sets of transition rollers 8 are provided on suitable transition support frames 9. A pressing frame 10 having a pressing roller 11 is provided within each transition zone 7a, 7b to ensure that the opposite edges 2a, 2b of the endless belt 2 overlap each other smoothly.
In operation, the drive roller 3, which is driven by a suitable drive means (not shown), frictionally engages the endless belt 2 and causes the belt 2 to run continuously in the direction of the arrows in Figure 1. As illustrated in Figure 1, the belt 2 passes around the driven roller 4 't~
~ CA21 ~97b9 and into a transition zone 7a in which the belt is gradually deformed by the transition rollers 8 and pressing rollers 11 until the edges 2a, 2b of the belt 2 overlap to define a tubular shape. Within the transition zone 7a, a hoper 12 deposits material to be transported 13 onto the belt 2. By this means, the material 13 is substantially enclosed by the belt 2 shortly after being deposited on the belt 2. The material 13 is transported along the length of the conveyor 1, in a substantially enclosed condition, to the transition zone 7b near the drive roller 3. As the belt 2 approaches the drive roller 3, the transition rollers 8 cause the belt 2 to smoothly transition to a flattened condition, thereby effectively "unwrapping" the material 13 being transported.
As the belt 2 passes around the drive roller 3, the material 13 is deposited from the belt 2 into a receiving tub 14.
From the drive roller 3, the belt passes through the transition zone 7b and returns to the driven roller 4 in a tubular condition. One or more tensioning or idler rollers 15 can be provided near the drive roller 3 to adjust belt tension and/or the angle of engagement between the belt 2 and the drive roller 3.
In the remaining discussion, the portion of the belt 2 travelling from the driven roller 4 to the drive roller 3, and on which the material 13 is transported, will be referred to as the outgoing belt 2'. Conversely, the portion of the belt 2 travelling from the driven roller 4 to .~
~ CA21 09769 the drive roller 3 will be referred to as the return belt 2''.
Figure 3 illustrates a portion of a pressing frame 10 disposed in the transition zone 7a near the driven roller 4. The pressing frame 10 is divided into an upper passage through which the outgoing belt 2' passes, and a lower passage (not shown), through which the return belt 2'' passes. The pressing frame 10 is located in the transition zone 7a, at or near the point at which the opposite edges 2a, 2b of the outgoing belt 2' overlap. The pressing roller 11 is composed of an inboard roller unit 16, and an outboard roller unit 17, both of which are independently mounted on bearings for rotation about a common shaft 18 (see Figure 4). The shaft 18 is conveniently affixed (for example by welding) to a mounting plate 19 having a plurality of mounting plate slots 20. A corresponding mounting bracket 21 affixed to the pressing frame 10 is provided with a plurality of mounting bracket slots 22, whereby the pressing roller can be conveniently affixed to the pressing frame by means of bolts passing through the slots 20 and 22.
Preferably, the slots 20 of the pressing roller mounting plate 19 are provided at right-angles to the slots 22 of the mounting bracket 21, so that the angle and the position (in both the vertical and lateral directions) of the pressing roller can be adjusted.
The pressing roller 11 is mounted so that the inboard roller unit 16 applies pressure to a first edge 2a ,.~
C~21 09769 of the belt 2' while the opposite edge 2b is being guided over it. At this point, the opposite edge 2b tends to drop (due to gravity and tension within the belt) onto the upper portion of the pressing roller 11, and contacts the outboard roller unit 17. Since the two roller units 16, 17 are independently mounted, they can rotate freely in opposite directions due to friction with the respective edges 2a, 2b of the belt 2', thereby minimizing frictional forces between the pressing roller 11 and the opposite edges 2a-b of the belt 2'.
In cases where the specific gravity of the material 13 being conveyed is large, it is preferable to support the belt 2' by means of a plurality of receiving rollers 23 operatively mounted to the pressing frame 10 as shown in dotted lines in Figure 3.
During running operation of the conveyor 1, the specific locations of the edges 2a, 2b of the belt 2' can change. As a result of this, it can be difficult to predict the best position of the pressing roller 11 so that one edge 2a contacts only the inboard roller unit 16, while the other edge 2b contacts only the outboard roller unit 17. Figure 5 illustrates an embodiment of the pressing roller 11 which substantially overcomes this difficulty. In this embodiment, the inboard and outboard roller units 16, 17 are replaced by a plurality of narrow roller units 24, each of which are independently mounted on bearings for rotation about the common shaft 18. This arrangement provides maximum flexibility in the placement of the pressing roller 11, and allows the edges 2a, 2b of the belt 2' to move during operation of the belt, while the probability of both edges simultaneously engaging the same roller unit 23 is minimized.
As mentioned previously, the endless belt 2 is substantially tubular in shape along most of the length of the conveyor 1, and transitions to a flat shape at either end of the conveyor 1 (i.e. as it passes around the drive and driven rollers 3 and 4). Between the transition zones 7a, 7b, the belt 2 is maintained in a tubular condition, and is supported by primary support rollers 5 operatively mounted on primary support frames 6 disposed at predetermined intervals along the length of the conveyor 1.
lS Each primary support frame 6 is provided with an upper passage through which the outgoing belt 2' passes, and a lower passage through which the return belt 2'' passes.
A respective set of primary support rollers 5 is operatively disposed within each of the upper and lower passages of the primary support frame 6. As illustrated in Figures 6a and 6b, each set of primary support rollers 5 comprises a plurality of rollers 5a-f which are arranged to form a polygonal configuration surrounding the belt 2 on all sides.
Figures 6a and 6b show two orientations of the primary support rollers 5a-f within the primary support frame 6 (i.e. hexagonal arrangements rotated 30~ with respect to each other). In order to maintain the belt 2 in ~ CA2 1.3~7~9 as close to a cylindrical shape as possible, it is preferable to alternately use both orientations in successive support frames along the length of the conveyor 1. Thus the orientations of the primary support rollers 5 will preferably alternate along the length of the conveyor 1 in the manner illustrated in Figure 7.
The primary support frames 6 are conveniently supported and linked longitudinally by structural elements 25 extending along substantially the whole length of the conveyor 1. Conveniently, through most of the length of the conveyor 1, the spaces between the primary support frames 6 will be substantially equal. However, in order to ensure a smooth entry (and exit) of the tubular belt 2 into (and from) the transition zones 7a-b, the spaces between the primary support frames 6 can advantageously be reduced near the transition zones 7a-b.
Next, torsion correcting means for appropriately correcting twisting phenomenon of the tubular belt conveyor and means for reducing the number of supporting rollers according to the present invention will be described.
Figures 9 and 10 generally show an example of the tubular belt conveyor according to the present invention.
In the side view of Figure 9 the tubular belt conveyor 1 is shown linearly inclined from the driven roller 4 end toward the driving roller 3 end. On the other hand, in the plan view of Figure 10 the conveyor 1 is shown partially curved in a transverse direction. In other respects, the general lay-out and operation of the conveyor 1 is similar to that Figure 1, and thus will not be discussed in further detail here.
As shown in Figure 11, in this example the supporting frame 6 is partitioned into upper and lower sections by a central partition member 6a, and central longitudinal structural elements 26 are mounted in the vicinity of the partition 6a in addition to the structural elements 25 described above.
Figure 12a shows a cross-sectional view through the conveyor 1 at a location approximately midway between successive primary support frames 6, within a straight portion of the conveyor 1. A horizontally disposed secondary support roller 27 supports the outgoing belt 2', and is mounted on secondary support brackets 28, which are in turn affixed to the central longitudinal structural elements 26. A similar secondary support roller 27 supports the return belt 2'', and is mounted on support brackets 28a affixed to the structural elements 25. The secondary support rollers 27, 27a serve to support the belt 2 between the primary support rollers 5. This helps prevent sagging of the belt, and allows the support frames to be spaced further apart (for example, a conventional spacing of 1.5m can be increased to approximately 2.0 to 2.5m).
k~
In order to correct undesired twisting of the belt 2, the brackets 28, 28a supporting the secondary support rollers 27 are affixed to the structural elements 25, 26 by means of mounting bolts 29. The mounting brackets 28, 28a are provided with elongated mounting slots 30, as illustrated in Figure 13, through which the mounting bolts 29 pass. By means of the elongated mounting slots 30, the angle of the secondary support rollers 27, can be adjusted with respect to the direction of travel of the belt 2, as shown in Figure 13. As the belt 2 runs over the angled roller 27, a twisting force F produced by friction between the belt 2 and the roller 27 is applied to the belt 2 in a direction determined by the direction of the angle of the roller 27. Thus during operation of the conveyor 1, any twist in the belt at a particular location can be corrected by suitably adjusting the angle of the supporting roller 27 nearest to that location, without interrupting the running operation of the conveyor 1.
Figure 14 shows a cross-sectional view through the conveyor 1 at a location approximately midway between successive primary support frames 6, within a curved portion of the conveyor 1. In addition to the horizontally arranged secondary support rollers 27, vertical bending rollers 31 are mounted on respective bending roller support brackets 32 affixed to the structural elements 25, 26. As shown in Figure 15, the bending rollers 31 are located on the inside of the curve of the belt 2, and helps to maintain a smooth .~
curve in the belt as it moves through the bend. In Figure 15, the solid and dashed lines respectively indicate the path of the belt 2 with and without the bending roller 31.
By maintaining a smoothly rounded curve between the primary support frames, the bending roller 31 reduces the running resistance of the belt 2.
The vertical bending rollers 31 are preferably mounted in a manner similar to that of the secondary support rollers 27. This allows the angle of the bending rollers 31 to be adjusted as shown in Figure 16. Thus in the curved portions of the conveyor 1, both the secondary support rollers 27 and the ending rollers 31 can be used to counteract any tendency of the belt 2 to twist. This allows any twisting tendency of the belt to be accurately counteracted,without interrupting running operation of the conveyor.
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited thereto and many variations and modifications of the invention can be practised upon consideration of the foregoing disclosure without departing from the scope and spirit of the appended claims.
Claims (14)
1. A tubular belt conveyor comprising:
a driving roller disposed at one end of the conveyor;
a driven roller disposed at the other end of the conveyor;
an endless conveyor belt wound around the driving and driven rollers, a portion of the belt travelling from the driven roller toward the driving roller defining an outgoing belt, and a portion of the belt travelling from the driving roller toward the driven roller defining a return belt;
a plurality of primary support frames substantially evenly spaced along the conveyor for supporting the outgoing and return belts;
deformation means disposed proximal each of the driving and driven rollers, for deforming both of the outgoing and return belts into a tubular shape, the outgoing and return belts being flattened to pass around the driving and driven rollers, whereby materials to be conveyed are placed on a flattened portion of the outgoing belt prior to deformation of the outgoing belt into a tubular shape by the deforming means, and the materials are conveyed in the wrapped condition; and guiding means disposed near the deformation means for guiding the edges of both the outward and return belts, the guiding means including at least one pressing roller comprising two or more respective roller elements disposed along a common axis, each roller element being independently rotatable.
a driving roller disposed at one end of the conveyor;
a driven roller disposed at the other end of the conveyor;
an endless conveyor belt wound around the driving and driven rollers, a portion of the belt travelling from the driven roller toward the driving roller defining an outgoing belt, and a portion of the belt travelling from the driving roller toward the driven roller defining a return belt;
a plurality of primary support frames substantially evenly spaced along the conveyor for supporting the outgoing and return belts;
deformation means disposed proximal each of the driving and driven rollers, for deforming both of the outgoing and return belts into a tubular shape, the outgoing and return belts being flattened to pass around the driving and driven rollers, whereby materials to be conveyed are placed on a flattened portion of the outgoing belt prior to deformation of the outgoing belt into a tubular shape by the deforming means, and the materials are conveyed in the wrapped condition; and guiding means disposed near the deformation means for guiding the edges of both the outward and return belts, the guiding means including at least one pressing roller comprising two or more respective roller elements disposed along a common axis, each roller element being independently rotatable.
2. A tubular belt conveyor as claimed in claim 1, wherein the pressing roller is disposed proximal a point at which opposite edges of the belt intersect and overlap.
3. A tubular belt conveyor as claimed in claim 1 or 2, wherein the pressing roller is mounted so as to bear against a first edge of the belt, the other edge of the belt being substantially free to run over the pressing roller opposite to the first edge.
4. A tubular belt conveyor as claimed in claim 3, wherein the pressing roller comprises an inboard roller element for bearing against the first edge of the belt, and an outboard roller element, the inboard and outboard roller elements being independently rotatable about a common shaft.
5. A tubular belt conveyor as claimed in claim 3, wherein the pressing roller comprises a plurality of narrow roller elements, each of the roller elements being independently rotatable about a common shaft.
6. A tubular belt conveyor as claimed in claim 1, wherein each of the primary support frames includes an upper passage through which the outgoing belt passes, and a lower passage through which the return belt passes, the upper and lower passages including a plurality of respective support rollers arranged in an polygonal configuration for supporting the outgoing and return belts.
7. A tubular belt conveyor as claimed in claim 6, wherein six support rollers arranged in a hexagonal configuration are respectively disposed in each of the upper and lower passages of each primary support frame, to support each of the outgoing and return belts.
8. A tubular belt conveyor as claimed in claim 4, wherein the support rollers of one primary support frame are rotated with respect to the support rollers of adjacent primary support frames, whereby the belt is prevented from adopting the overall shape of the support rollers, and thus ensures that the belt retains a smoothly rounded shape.
9. A tubular belt conveyor as claimed in claim 1, further comprising secondary support rollers disposed substantially horizontally under each of the outgoing and return belts, approximately midway between each of the primary support frames, the secondary support rollers serving to prevent sagging of the belt between the primary support frames.
10. A tubular belt conveyor as claimed in claim 9, further comprising first adjusting means for adjusting an angle of the secondary support rollers with respect to the running direction of the belt, whereby the angle of the secondary support rollers can be adjusted to counteract twisting of the belt.
11. A tubular belt conveyor as claimed in claim 10, wherein the first adjusting means is capable of permitting adjustment of the angle of the secondary support roller during running operation of the conveyor, whereby any twisting of the belt can be accurately corrected, without interrupting operation of the conveyor.
12. A tubular belt conveyor as claimed in claim 1, further comprising, when the conveyor follows a transversely bent path, vertically oriented bending rollers disposed on the inside of the transversely bent portion of the belt, approximately midway between the primary support frames, the bending rollers serving to maintain the running belt in a smoothly bending path between the primary support frames.
13. A tubular belt conveyor as claimed in claim 12, further comprising second adjusting means for adjusting an angle of the bending rollers with respect to the running direction of the belt, whereby the angle of the bending rollers can be adjusted to counteract twisting of the belt.
14. A tubular belt conveyor as claimed in claim 13, wherein the second adjusting means is capable of permitting adjustment of the angle of the bending roller during running operation of the conveyor, whereby any twisting of the belt can be accurately corrected, without interrupting operation of the conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2109769 CA2109769C (en) | 1993-11-23 | 1993-11-23 | Tubular belt conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2109769 CA2109769C (en) | 1993-11-23 | 1993-11-23 | Tubular belt conveyor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2109769A1 CA2109769A1 (en) | 1995-05-24 |
| CA2109769C true CA2109769C (en) | 1999-05-11 |
Family
ID=4152522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2109769 Expired - Fee Related CA2109769C (en) | 1993-11-23 | 1993-11-23 | Tubular belt conveyor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2109769C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3571001B2 (en) * | 2001-03-15 | 2004-09-29 | 川崎重工業株式会社 | Trough connection structure of air levitation type belt conveyor |
| CN116443517A (en) * | 2023-03-09 | 2023-07-18 | 白银银河机械制造有限公司 | Turnover belt conveyor |
-
1993
- 1993-11-23 CA CA 2109769 patent/CA2109769C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2109769A1 (en) | 1995-05-24 |
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