CA1195279A - Method and apparatus for transferring bulk material to and from both ways using a tubular belt - Google Patents
Method and apparatus for transferring bulk material to and from both ways using a tubular beltInfo
- Publication number
- CA1195279A CA1195279A CA000417858A CA417858A CA1195279A CA 1195279 A CA1195279 A CA 1195279A CA 000417858 A CA000417858 A CA 000417858A CA 417858 A CA417858 A CA 417858A CA 1195279 A CA1195279 A CA 1195279A
- Authority
- CA
- Canada
- Prior art keywords
- endless belt
- flexible tubular
- twisting
- bulk material
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Belt Conveyors (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus for transferring bulk material in two directions using a flexible tubular endless belt are disclosed. A tubular form flexible tubular endless belt is extended between loading and unloading points positioned at a predetermined distance away from each other at any height. The return path of the belt, which is empty in a convention method and apparatus, is utilized effectively for transferring another bulk material according to an embodiment of the present invention. The endless belt is twisted through 180 degrees into a tubular form or into a flat form before loading and after unloading the second bulk material.
A method and apparatus for transferring bulk material in two directions using a flexible tubular endless belt are disclosed. A tubular form flexible tubular endless belt is extended between loading and unloading points positioned at a predetermined distance away from each other at any height. The return path of the belt, which is empty in a convention method and apparatus, is utilized effectively for transferring another bulk material according to an embodiment of the present invention. The endless belt is twisted through 180 degrees into a tubular form or into a flat form before loading and after unloading the second bulk material.
Description
The present invention relates to a method and apparatus for trans-ferring bulk material using a flexible tubular belt. More particularly it relates to a method and apparatus for conveying and elevating bulk material e.g., powder, granules, fibers, pellet, chunks, earth, mud, sludge, pulverized material, or mixtures thereof, enclosed within a flexible tubular endless belt in two directions.
In a previously proposed flexible tubular endless belt conveyer system for transferring bulk material, e.g., powder, granules, fiber, pellet, chunk, earth, mud, sludge, pulverized material, or mixtures thereof, which is enclosed~ within a flexible tubular endless belt, the tubular belt in the return path is empty.
A flexible tubular endless belt used in such a belt conveyer system generally comprises an outer surface layer which is contacted with support rollers and thus has a large abrasion-resistance, and an inner surface layer which wraps the bulk material. Hence, this flexible tubular endless belt cannot be allowed to roll inside out.
If the tubular belt should be rolled up inside out, the bulk material attached to the inner surface of the belt is dropped down in the return path by vibrations and the like, thereby causing an environmental contamination. Further, both side ends of the tubular belt which are rounded, and which overlap one another along their longitudinal direction, should always ~e positioned upwards so that the bulk material may not be spilt over the belt. However, when the belt is rolled up inside out, since the inner surface layer directs downwards, the side ends of the tubular belt cannot be rounded upwards.
It is an object of one aspect of the present invention to provide a method for transferring bulk material in two directions using a flexible .
tubular endless belt, substantially free from the aforementioned incon-veniences, which utilizes the empty tubular belt of the return path efec-tively.
It is an object of another aspect of the present invention to provide an apparatus for transferring bulk material in two directions using a flexible tubular endless belt, substantially free from the afore-mentioned inconveniences, which effectively utilizes the empty tubular belt of the return path.
According to one broad aspect of the present invention a method is provided f~r transferring bulk material in two directions using a flexible tubular endless belt, wherein a tubular form flexible tubular endless belt is extended between loading and unloading points spaced apart from one another at a predetermined distance at any height, and is opened at the loading and the unloading points, and wherein both side edges of the flexible tubular endless belt, which overlap one another along its longitudinal direction, are positioned upwards in the forward path. The improved method comprises the steps of: (a) twisting the flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path; (b) loading bulk material into the flexible tubular endless belt so opened; (c) transferring the bulk material enclosed within the tubular form flexible tubular endless belt; (d) unloading the bulk material from the flexible tubular endless belt after it has been opened again; and (e) again twisting the flexible tubular endless belt through 180 degrees in the return path before it reaches the loading point.
By one variant thereof, the step of twisting the flexible tubular endless belt is effected by twisting rollers as the belt is maintained in a tubular form.
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By another variant thereof, the steps of twisting the flexible tubular endless belt is effected by turnover rollers as the belt is maintained in a flat form.
According to another aspect of the present invention, an apparatus is provided for transferring bulk material in two directions using a flexible tubular endless belt, wherein a tubular form flexible tubular endless belt is extended between loading and unloading points spaced apart from one another at a predetermined distance at any height, and is opened at the loading and the unloading points, and wherein both side edges of the flexible t~bular endless belt, which overlap one another along its longi-tudinal direction, are positioned upwards in the forward path. The improved apparatus comprises: (a) first twisting means which twists the flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path; (b) means for feeding bulk material into the flexible tubular endless belt so opened; (c) means for rolling up the flexible tubular endless belt so as to wrap completely the bulk material therein; (d) support rollers which support the pipe-formed flexible tubular endless belt transferring the bulk material in the return path; (e~
means for opening the pipe-formed flexible tubular endless belt; (f) means for discharging the bulk material from the so opened flexible tubular endless belt; and (g) second twisting means which again twists the flexible tubular endless belt through 180 degrees in the return path beEore it reaches the loading point.
By one variant thereof, the twisting means comprises turnover rollers for turning over the flattened flexible tubular endless belt through 180 degrees.
52'~9 By another variant, the twisting means comprises twisting rollers for twisting the tubular Eorm flexible tubular endless belt through 180 degrees.
By a further variant, the discharging means comprises a plurality of rollers which are aligned downwards in a trape~oidal form in cross-section, and on which the flattened flexible tubular endless belt is adapted to move downwards in a roundabout path.
By yet another variant, each turnover roller is provided with flanges in its both ends in order to prevent the flexible tubular endless belt from slipping off the roller.
In the accompanying drawings, Fig. 1 is a schematic side view of one embodiment of an apparatus for transferring bulk material in two directions using a flexible tubular endless belt according to one aspect of the present invention;
Fig. 2 is an enlarged longitudinal cross section, taken along the line II - II of Fig. l;
Fig. 3 is an enlarged cross sectional view, taken along the line III - III of Fig. l;
Fig. 4 is an enlarged longitudinal cross section, taken along the line IV - IV of Fig. l;
Fig. 5 is a transverse cross sectional view, taken along the line V - V of Fig. 4;
Fig. 6 is an enlarged perspective view of a spacer shown in Fig.
5;
Fig. 7 is an enlarged longitudinal cross section, taken along the line VII - VII of Fig. l;
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5~7~3 Fig. 8 is an enlarged longitudinal cross section, taken along the line VIII - VIII of Fig. l;
Fig. 9 is an enlarged longitudinal cross section, taken along the line IX - IX of Fig. l;
Fig. 10 is a transverse cross sectional view of a support frame to which a twisting means is attached, according to another aspect of the present invention;
Fig. 11 is a longitudinal cross section, taken along the line XI -XI of Fig. 10;
Fig. 12 is a schematic side view of another embodiment of an apparatus for transferring bulk material in two directions using a flexible tubular endless belt according to a further aspect of the present invention;
Fig. 13 is an enlarged side view of first turnover rollers for twisting a flexible tubular endless belt through 180 degrees in the return path; and Fig. 14 is an enlarged longitudinal cross section, taken along the line XIV - XIV of Fig. 12.
Referring now to the drawings, there is shown in Figs. 1 - 11 one embodirnent of an apparatus for transferring bulk material in two directions using a flexible tubular endless belt according to one aspect of the present invention, wherein axes of rollers and drums direct in the direction perpendicular to the moving direction of a flexible tubular endless belt 1, unless otherwise provided.
The tubular endless belt 1 made of a flexible or elastic material e.g., rubber, somewhat soft plastic, or the like, is formed such that in its relaxed state it adopts a tubular form, curved through appreciably more .: , than 360, so that its inner and outer side ends may be overlapped along the longitudinal direction of the belt. A conventional flat flexible endless belt may also be used. The flexible tubular endless belt 1 is stretched between a lower idler drum 2 and an upper drive drum 3 which are positioned at loading and unloading points spaced apart from each other by a predetermined distance. The endless belt 1 is opened at the loading and the unloading points in a flattened form on and around the lower and the upper drums 2 and 3. The endless belt 1 is moved in upper forward and lower return paths la and lb. The endless belt 1 just around the upper drum 3 is ~oved in the return path lb via a first guide roller ~, discharge means 5 hereinafter mentioned, and a second guide roller 6, to the lower drum 2.
As shown in Fig. 1, the endless belt 1 is supported by first support frames 7 and second support frames 8 in its middle part and lower and upper end parts along its entire length. The first support frames 7 and the second support frames 8 are aligned in parallel at a predetermined interval by using beams 9. The first support frame 7 comprises upper and lower chambers 7a and 7b, divided by partition plates, as shown in Fig. 2, and the second support frame 8 comprises an upper chamber (not shown) and a lower chamber 8a, in the same manner as the first support frame 7, as shown in Fig. ~.
A plurality of roller supports 10, each comprising a base plate lOa and a pair of side plates lOb extending at a predetermined distance from the ends of the base plate lOa in a direction perpendicular to the base plate lOa, are arranged radially in a circular form in each chamber 7a or 7b of the support frame 7. A support roller 11 is rotatably mounted to 5~7~31 the side plates lOb of the roller suppor~ 10, so that the support rollers 11 mounted to the roller supports 10 may be arranged radially around the periphery of the pipe-formed belt 1 and support the pipe-formed belt 1 in contact therewith.
The opened belt 1 is turned around the lower drum 2 from the lower return path lb to the upper going path la, and then is closed gradually into a tubular form by its own rolling up force while supported by guide rollers 12 and 13 on its bottom and both sides, while a fir.st bulk material lS
is fed onto the opened belt 1 from a hopper 14 which is arranged above the lower drum 2, as shown in Fig. 3.
Then, the tubular belt 1, now enclosing the first bulk material 15 completely, is passed through the upper chambers of the support frames 8 and then the upper chambers 7a of the support frames 7 along the forward path la of the tubular belt, while the tubular endless belt 1 is supported by the support rollers 11 in the upper chambers of the support frames 7 and 8. On this occasion, the side ends of the belt 1, which overlap each other, are situated upwards along the forward path la of the belt 1 while the first material 15 is completely enclosed therein.
Next, in the top end of the belt conveyer, the tubular endless belt 1 is opened gradually again around the upper drum 3 by belt extension means 16 having a symmetrical construction to the belt round means posi-tioned in the lower end of the forward path la, as described above, and its lower part is supported by guide rollers in the same manner as the lower end part of the belt 1, while the first bulk material 15 is discharged into a receiver 17 from the so-opened endless belt 1 around the upper drurn 3.
Then, the flattened endless belt 1 around the upper drum 3 is passed through the first guide roller 4, and then is rolled up into a tubular _.
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form in the return path lb by first belt round means 18 having the same construction as the one arranged in the lower end of the going path la.
The tubular form endless belt 1 is then passed through the lower chambers 8a of the second support frames 8.
As shown in Fig. 4, a plurality of roller supports 19, each com-prising a base p-late 19a and a pair of side plates in the same manner as 10 of Fig. 2, and support rollers 20 are arranged radially in the circular form in the lower chamber 8a of each second support frame 8 by bolts 22 and nuts, in the same manner as the first support frame 7 of Fig. 2.
In this embodiment, as shown in Fig. 5, one support roller 20 or a plurality of support rollers 20 of Fig. 4, is or are inclined by inserting a U-shaped spacer or spacers 21 whose one embodiment is clearly shown in Fig. 6, between the second support frame 8 and one end or ends of the base plate or plates l9a of the roller support or supports 19 and mounting them by the bolts 22 and the nuts. Such a roller or rollers 20 mounted as the first twisting roller or rollers to the second support frame 8 by using the spacer of spacers 21, which composes or compose twisting means, are all inclined in the same direction at a predetermined angle with reference to the surface of the second support frame 8 perpendicular to the axis of the pipe-formed endless belt 1.
Therefore, the pipe-formed endless belt 1 passing through the lower chambers 8a of the second support frames 8 in the return path lb is gradually twisted through 180 degrees around the axis of the tubular form endless belt 1 by the first twisting roller or rollers, until the side ends, which over-lap one another, of the tubular form endless belt 1 are positioned upwards.
Then, the tubular form endless belt 1 is opened gradually, as Z~3 shown in Fig. 8, by belt opening means which comprises horizontal support rollers 24 supporting the central bottom of the belt 1, and inclined opening rollers 25 holding the inner side ends of the belt 1. At this time, a second bulk material 27 is fed into the opened endless belt 1 by a first belt conveyer 26 which extends in the direction perpendicular to the moving direction of the belt 1 in the return path lb, and whose front end is positioned above the opened endless belt 1.
Then, the opened belt 1 enclosing the second bulk material 27 is gradually closed into a tubular by belt round means 28 having the same con-struction a~s the first belt round means 18 described above? while the side ends of the belt are positioned upside. The tubular form endless belt 1 is then passed through the lower chambers 7b of t4e first support frames 7 while being supported by the support rollers 11 in the lower return path lb.
When the endless belt 1 enclosing the second bulk material 27 completely reaches the predetermined position, the endless belt 1 is opened into a flattened form by belt extension means 29 having the same con-struction as the belt extension means 16 described above.
The flattened endless belt 1 is moved to the discharge means 5 comprising a plurality of discharge rollers 5a, 5b, 5c and Sd which are aligned downwards in a trapezoidal form in cross-section, and the flattened endless belt 1 is consecutively moved downwards around the discharge rollers 5a, 5b, 5c and 5d in a roundabout path of the return path lb.
A second belt conveyer 30 extends in the direction perpendicular to the moving direction of the belt 1 in the return path lb, and its rear end is positioned in the discharge means 5 under the discharge roller 5a so that the second bulk material 27 may be transferred from the flattened ~ ~ ~5~
belt l around the discharge roller 5a onto the second belt conveyer 30, as shown in Fig. 9.
The flattened endless belt 1 passing through the discharge means 5 is then rolled up in the tubular form by second belt round means 31 which possesses the same construction as the first belt round means 18 in the return path lb. Then, the tubular form endless belt l is twisted again through 180 degrees by a second twisting roller or rollers (not shown) in the same manner as the first twisting roller or rollers, as described hereinbefore in connection with Figs. 4 - 6, and thereby the side ends of the endles~s belt l, which overlap each other, are positioned in the bottom.
Then, the tubular form endless belt l is opened again into the flattened form by belt extension means having the same construction as the belt extension means 16 described above, and the flattened endless belt 1 is moved around the lower drum 2 via the second guide roller 6.
Although the six support rollers are radia]ly arranged around the - periphery of the pipe-formed endless belt in contact therewith in each upper or lower chamber of the support frame, the number of the support rollers can be varied freely as occasion demands. Further, the number of the twisting rollers can be also varied freely depending on the mechanical . 7n properties of the flexible endless belt, the number of the second support frames, and so forth.
In Figs. 10 and 11 another embodiment of the belt twisting means i5 shown wherein the same numbers as those of the above described embodi-ment denote the same members as those thereof, and thus their detailed explanation can be omitted for the brevity.
In a lower chamber 51a of a second support frame 51 corres-_ 10 --5~7~
ponding to the second support frame 8 of Figs. 4 and 5, the support rollers 11 are arranged radially around the belt 1 in contact therewith in the return path lb in the same manner as described above. A bracket 52 is mounted to the lower beams 9 in parallel with the support frame 51 adjacent thereto.
A U-shaped roller support 53 comprising a base plate 53a and a pair of side plates 53b, having the same construction as the one 10 of Fig. 2, is pivotally mounted in the center of the bracket 52 via a vertical pivot pin 54. The side plates 53b of the roller support 53 rotatably suport a twisting roller 55 therebetween in contact with the bottom of the belt 1 in the return path lb.
A mount plate 56 is integrally connected to the base plate 53a of the roller support 53, and extends horizontally in the direction per-pendicular to the moving direction of the belt 1. To the free end of the mount plate 56 a lever 57 for pivoting the twisting roller 55 is integrally attached.
The mount plate 56 is provided with a circular arc slot 58 whose circular center is positioned at the vertical pivot pin 54. A stop bolt 59 is passed vertically through the hole oE the bracket 52 and the arc slot 58 and its screw end part beyond the arc slot 58 is engaged with a stop nut 60. The pivotable mount plate 56 is fixed wit:h respect to the bracket 52 by screwing up the bolt 59 and the nut 60.
In this embodiment, in order to twist the endless belt 1 in the return path lb with respect to the moving direction of the belt 1, the nut 60 is loosened, and the pivot lever 57, i.e., the roller support 53 is pivoted at a proper angle around the pivot pin 54 so that the twisting roller 55 may be inclined with respect to the moving direction of the belt 1. Then, the nut 60 is tightened again in order to fix the twisting roller 55 inclined.
Although one twisting roller 55 is mounted to the bottom of the lower chamber 51a of the second support frame 51, a plurality of twisting rollers can be-arranged in the lower chamber 51a of the second support frame 51, as occasion demands.
In this embodiment of this aspect of the present invention, described above, although the second bulk material 27 is fed to the opened endless bçlt 1 by using the first belt conveyer 26, a hopper (not shown) can be used instead of the belt conveyer 26. Further, the second bulk material 27 can be scraped off by a discharging plate (not shown) which is crossed horizontally and diagonally over the flattened endless belt 1, instead of the discharging means 5 which comprises the discharging rollers.
In Figs. 12 - 14 another embodiment of an apparatus is shown for transferring bulk material in two directions using a flexible tubular endless belt according to another aspect of the present invention, which possesses the same construction as the first embodiment of the apparatus shown in Figs. 1 - 11, except that the endless belt 1 is twisted through 180 degrees as the flattened form by first and second twisting means which comprise a plurality of turnover rollers, as hereinafter described in detail.
In this embodiment, after discharging the first bulk material 15 from the opened endless belt 1 into the receiver 17 around the upper drum 3, the flattened endless belt 1 is passed through the first guide roller 4, third guide rollers 65, and a tension roller 66 in the return path lb.
The tension force is given to the tension roller 66 by a weight 70 which is ;27~
hung on the tension roller 66 via a pivot shaft.
Afte-r passing around the latter third guide roller 65, the flattened endless belt l whose inside surface faces downwards, is gradually twisted or turned over through 180 degrees by the first twisting means which comprises pairs of first turnover rollers 67. Each turncver roller 67 is provided with flanges 67a in its both ends, which prevent the flexible tubular endless belt 1 from its slipping off.
Each pair of turnover rollers 67 holds the flattened endless belt l therebetween. The inclination angle of each pair of turnover rollers 67 is increased gradually in one direction as the endless belt l is passed therethrough in the return path lb, as clearly shown in Fig. 13.
This turnover of the flattened endless belt l is usually carried out in a distance which is approximately twenty times as long as the width of the belt 1, and this distance can ~e, of course, varied as occasion demands.
Onto the flattened endless belt l, which has been turned over upside down by the first turnover rollers 67, as described above, the second bulk material 27 is fed by the first belt conveyer 26, in the same manner as the first e~bodiment, as shown in Fig. 14.
Then, the endless belt l completely enclosing the second bulk material 27 is moved to the discharge means 5 through the lower chambers 7b of the first support frames 7, and the second bulk material 27 is discharged from the opened endless belt l to the second belt conveyer 30 in the discharge means 5, in the same manner as the first embodiment.
After passing through the discharge means 5, the flattened endless belt 1 is twisted or tuIned over through 180 degrees by the second tWistillg means comprising second turnover rollers 69, each having the same _ 13 -` - :
construction as the first turnover roller 67, in the same manner as the first twisting means described above in the return path lb. Then, the turned-over endless belt 1 is returned to the lower drum 2 through the second guide roller 6.
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In a previously proposed flexible tubular endless belt conveyer system for transferring bulk material, e.g., powder, granules, fiber, pellet, chunk, earth, mud, sludge, pulverized material, or mixtures thereof, which is enclosed~ within a flexible tubular endless belt, the tubular belt in the return path is empty.
A flexible tubular endless belt used in such a belt conveyer system generally comprises an outer surface layer which is contacted with support rollers and thus has a large abrasion-resistance, and an inner surface layer which wraps the bulk material. Hence, this flexible tubular endless belt cannot be allowed to roll inside out.
If the tubular belt should be rolled up inside out, the bulk material attached to the inner surface of the belt is dropped down in the return path by vibrations and the like, thereby causing an environmental contamination. Further, both side ends of the tubular belt which are rounded, and which overlap one another along their longitudinal direction, should always ~e positioned upwards so that the bulk material may not be spilt over the belt. However, when the belt is rolled up inside out, since the inner surface layer directs downwards, the side ends of the tubular belt cannot be rounded upwards.
It is an object of one aspect of the present invention to provide a method for transferring bulk material in two directions using a flexible .
tubular endless belt, substantially free from the aforementioned incon-veniences, which utilizes the empty tubular belt of the return path efec-tively.
It is an object of another aspect of the present invention to provide an apparatus for transferring bulk material in two directions using a flexible tubular endless belt, substantially free from the afore-mentioned inconveniences, which effectively utilizes the empty tubular belt of the return path.
According to one broad aspect of the present invention a method is provided f~r transferring bulk material in two directions using a flexible tubular endless belt, wherein a tubular form flexible tubular endless belt is extended between loading and unloading points spaced apart from one another at a predetermined distance at any height, and is opened at the loading and the unloading points, and wherein both side edges of the flexible tubular endless belt, which overlap one another along its longitudinal direction, are positioned upwards in the forward path. The improved method comprises the steps of: (a) twisting the flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path; (b) loading bulk material into the flexible tubular endless belt so opened; (c) transferring the bulk material enclosed within the tubular form flexible tubular endless belt; (d) unloading the bulk material from the flexible tubular endless belt after it has been opened again; and (e) again twisting the flexible tubular endless belt through 180 degrees in the return path before it reaches the loading point.
By one variant thereof, the step of twisting the flexible tubular endless belt is effected by twisting rollers as the belt is maintained in a tubular form.
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By another variant thereof, the steps of twisting the flexible tubular endless belt is effected by turnover rollers as the belt is maintained in a flat form.
According to another aspect of the present invention, an apparatus is provided for transferring bulk material in two directions using a flexible tubular endless belt, wherein a tubular form flexible tubular endless belt is extended between loading and unloading points spaced apart from one another at a predetermined distance at any height, and is opened at the loading and the unloading points, and wherein both side edges of the flexible t~bular endless belt, which overlap one another along its longi-tudinal direction, are positioned upwards in the forward path. The improved apparatus comprises: (a) first twisting means which twists the flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path; (b) means for feeding bulk material into the flexible tubular endless belt so opened; (c) means for rolling up the flexible tubular endless belt so as to wrap completely the bulk material therein; (d) support rollers which support the pipe-formed flexible tubular endless belt transferring the bulk material in the return path; (e~
means for opening the pipe-formed flexible tubular endless belt; (f) means for discharging the bulk material from the so opened flexible tubular endless belt; and (g) second twisting means which again twists the flexible tubular endless belt through 180 degrees in the return path beEore it reaches the loading point.
By one variant thereof, the twisting means comprises turnover rollers for turning over the flattened flexible tubular endless belt through 180 degrees.
52'~9 By another variant, the twisting means comprises twisting rollers for twisting the tubular Eorm flexible tubular endless belt through 180 degrees.
By a further variant, the discharging means comprises a plurality of rollers which are aligned downwards in a trape~oidal form in cross-section, and on which the flattened flexible tubular endless belt is adapted to move downwards in a roundabout path.
By yet another variant, each turnover roller is provided with flanges in its both ends in order to prevent the flexible tubular endless belt from slipping off the roller.
In the accompanying drawings, Fig. 1 is a schematic side view of one embodiment of an apparatus for transferring bulk material in two directions using a flexible tubular endless belt according to one aspect of the present invention;
Fig. 2 is an enlarged longitudinal cross section, taken along the line II - II of Fig. l;
Fig. 3 is an enlarged cross sectional view, taken along the line III - III of Fig. l;
Fig. 4 is an enlarged longitudinal cross section, taken along the line IV - IV of Fig. l;
Fig. 5 is a transverse cross sectional view, taken along the line V - V of Fig. 4;
Fig. 6 is an enlarged perspective view of a spacer shown in Fig.
5;
Fig. 7 is an enlarged longitudinal cross section, taken along the line VII - VII of Fig. l;
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5~7~3 Fig. 8 is an enlarged longitudinal cross section, taken along the line VIII - VIII of Fig. l;
Fig. 9 is an enlarged longitudinal cross section, taken along the line IX - IX of Fig. l;
Fig. 10 is a transverse cross sectional view of a support frame to which a twisting means is attached, according to another aspect of the present invention;
Fig. 11 is a longitudinal cross section, taken along the line XI -XI of Fig. 10;
Fig. 12 is a schematic side view of another embodiment of an apparatus for transferring bulk material in two directions using a flexible tubular endless belt according to a further aspect of the present invention;
Fig. 13 is an enlarged side view of first turnover rollers for twisting a flexible tubular endless belt through 180 degrees in the return path; and Fig. 14 is an enlarged longitudinal cross section, taken along the line XIV - XIV of Fig. 12.
Referring now to the drawings, there is shown in Figs. 1 - 11 one embodirnent of an apparatus for transferring bulk material in two directions using a flexible tubular endless belt according to one aspect of the present invention, wherein axes of rollers and drums direct in the direction perpendicular to the moving direction of a flexible tubular endless belt 1, unless otherwise provided.
The tubular endless belt 1 made of a flexible or elastic material e.g., rubber, somewhat soft plastic, or the like, is formed such that in its relaxed state it adopts a tubular form, curved through appreciably more .: , than 360, so that its inner and outer side ends may be overlapped along the longitudinal direction of the belt. A conventional flat flexible endless belt may also be used. The flexible tubular endless belt 1 is stretched between a lower idler drum 2 and an upper drive drum 3 which are positioned at loading and unloading points spaced apart from each other by a predetermined distance. The endless belt 1 is opened at the loading and the unloading points in a flattened form on and around the lower and the upper drums 2 and 3. The endless belt 1 is moved in upper forward and lower return paths la and lb. The endless belt 1 just around the upper drum 3 is ~oved in the return path lb via a first guide roller ~, discharge means 5 hereinafter mentioned, and a second guide roller 6, to the lower drum 2.
As shown in Fig. 1, the endless belt 1 is supported by first support frames 7 and second support frames 8 in its middle part and lower and upper end parts along its entire length. The first support frames 7 and the second support frames 8 are aligned in parallel at a predetermined interval by using beams 9. The first support frame 7 comprises upper and lower chambers 7a and 7b, divided by partition plates, as shown in Fig. 2, and the second support frame 8 comprises an upper chamber (not shown) and a lower chamber 8a, in the same manner as the first support frame 7, as shown in Fig. ~.
A plurality of roller supports 10, each comprising a base plate lOa and a pair of side plates lOb extending at a predetermined distance from the ends of the base plate lOa in a direction perpendicular to the base plate lOa, are arranged radially in a circular form in each chamber 7a or 7b of the support frame 7. A support roller 11 is rotatably mounted to 5~7~31 the side plates lOb of the roller suppor~ 10, so that the support rollers 11 mounted to the roller supports 10 may be arranged radially around the periphery of the pipe-formed belt 1 and support the pipe-formed belt 1 in contact therewith.
The opened belt 1 is turned around the lower drum 2 from the lower return path lb to the upper going path la, and then is closed gradually into a tubular form by its own rolling up force while supported by guide rollers 12 and 13 on its bottom and both sides, while a fir.st bulk material lS
is fed onto the opened belt 1 from a hopper 14 which is arranged above the lower drum 2, as shown in Fig. 3.
Then, the tubular belt 1, now enclosing the first bulk material 15 completely, is passed through the upper chambers of the support frames 8 and then the upper chambers 7a of the support frames 7 along the forward path la of the tubular belt, while the tubular endless belt 1 is supported by the support rollers 11 in the upper chambers of the support frames 7 and 8. On this occasion, the side ends of the belt 1, which overlap each other, are situated upwards along the forward path la of the belt 1 while the first material 15 is completely enclosed therein.
Next, in the top end of the belt conveyer, the tubular endless belt 1 is opened gradually again around the upper drum 3 by belt extension means 16 having a symmetrical construction to the belt round means posi-tioned in the lower end of the forward path la, as described above, and its lower part is supported by guide rollers in the same manner as the lower end part of the belt 1, while the first bulk material 15 is discharged into a receiver 17 from the so-opened endless belt 1 around the upper drurn 3.
Then, the flattened endless belt 1 around the upper drum 3 is passed through the first guide roller 4, and then is rolled up into a tubular _.
.
527~
form in the return path lb by first belt round means 18 having the same construction as the one arranged in the lower end of the going path la.
The tubular form endless belt 1 is then passed through the lower chambers 8a of the second support frames 8.
As shown in Fig. 4, a plurality of roller supports 19, each com-prising a base p-late 19a and a pair of side plates in the same manner as 10 of Fig. 2, and support rollers 20 are arranged radially in the circular form in the lower chamber 8a of each second support frame 8 by bolts 22 and nuts, in the same manner as the first support frame 7 of Fig. 2.
In this embodiment, as shown in Fig. 5, one support roller 20 or a plurality of support rollers 20 of Fig. 4, is or are inclined by inserting a U-shaped spacer or spacers 21 whose one embodiment is clearly shown in Fig. 6, between the second support frame 8 and one end or ends of the base plate or plates l9a of the roller support or supports 19 and mounting them by the bolts 22 and the nuts. Such a roller or rollers 20 mounted as the first twisting roller or rollers to the second support frame 8 by using the spacer of spacers 21, which composes or compose twisting means, are all inclined in the same direction at a predetermined angle with reference to the surface of the second support frame 8 perpendicular to the axis of the pipe-formed endless belt 1.
Therefore, the pipe-formed endless belt 1 passing through the lower chambers 8a of the second support frames 8 in the return path lb is gradually twisted through 180 degrees around the axis of the tubular form endless belt 1 by the first twisting roller or rollers, until the side ends, which over-lap one another, of the tubular form endless belt 1 are positioned upwards.
Then, the tubular form endless belt 1 is opened gradually, as Z~3 shown in Fig. 8, by belt opening means which comprises horizontal support rollers 24 supporting the central bottom of the belt 1, and inclined opening rollers 25 holding the inner side ends of the belt 1. At this time, a second bulk material 27 is fed into the opened endless belt 1 by a first belt conveyer 26 which extends in the direction perpendicular to the moving direction of the belt 1 in the return path lb, and whose front end is positioned above the opened endless belt 1.
Then, the opened belt 1 enclosing the second bulk material 27 is gradually closed into a tubular by belt round means 28 having the same con-struction a~s the first belt round means 18 described above? while the side ends of the belt are positioned upside. The tubular form endless belt 1 is then passed through the lower chambers 7b of t4e first support frames 7 while being supported by the support rollers 11 in the lower return path lb.
When the endless belt 1 enclosing the second bulk material 27 completely reaches the predetermined position, the endless belt 1 is opened into a flattened form by belt extension means 29 having the same con-struction as the belt extension means 16 described above.
The flattened endless belt 1 is moved to the discharge means 5 comprising a plurality of discharge rollers 5a, 5b, 5c and Sd which are aligned downwards in a trapezoidal form in cross-section, and the flattened endless belt 1 is consecutively moved downwards around the discharge rollers 5a, 5b, 5c and 5d in a roundabout path of the return path lb.
A second belt conveyer 30 extends in the direction perpendicular to the moving direction of the belt 1 in the return path lb, and its rear end is positioned in the discharge means 5 under the discharge roller 5a so that the second bulk material 27 may be transferred from the flattened ~ ~ ~5~
belt l around the discharge roller 5a onto the second belt conveyer 30, as shown in Fig. 9.
The flattened endless belt 1 passing through the discharge means 5 is then rolled up in the tubular form by second belt round means 31 which possesses the same construction as the first belt round means 18 in the return path lb. Then, the tubular form endless belt l is twisted again through 180 degrees by a second twisting roller or rollers (not shown) in the same manner as the first twisting roller or rollers, as described hereinbefore in connection with Figs. 4 - 6, and thereby the side ends of the endles~s belt l, which overlap each other, are positioned in the bottom.
Then, the tubular form endless belt l is opened again into the flattened form by belt extension means having the same construction as the belt extension means 16 described above, and the flattened endless belt 1 is moved around the lower drum 2 via the second guide roller 6.
Although the six support rollers are radia]ly arranged around the - periphery of the pipe-formed endless belt in contact therewith in each upper or lower chamber of the support frame, the number of the support rollers can be varied freely as occasion demands. Further, the number of the twisting rollers can be also varied freely depending on the mechanical . 7n properties of the flexible endless belt, the number of the second support frames, and so forth.
In Figs. 10 and 11 another embodiment of the belt twisting means i5 shown wherein the same numbers as those of the above described embodi-ment denote the same members as those thereof, and thus their detailed explanation can be omitted for the brevity.
In a lower chamber 51a of a second support frame 51 corres-_ 10 --5~7~
ponding to the second support frame 8 of Figs. 4 and 5, the support rollers 11 are arranged radially around the belt 1 in contact therewith in the return path lb in the same manner as described above. A bracket 52 is mounted to the lower beams 9 in parallel with the support frame 51 adjacent thereto.
A U-shaped roller support 53 comprising a base plate 53a and a pair of side plates 53b, having the same construction as the one 10 of Fig. 2, is pivotally mounted in the center of the bracket 52 via a vertical pivot pin 54. The side plates 53b of the roller support 53 rotatably suport a twisting roller 55 therebetween in contact with the bottom of the belt 1 in the return path lb.
A mount plate 56 is integrally connected to the base plate 53a of the roller support 53, and extends horizontally in the direction per-pendicular to the moving direction of the belt 1. To the free end of the mount plate 56 a lever 57 for pivoting the twisting roller 55 is integrally attached.
The mount plate 56 is provided with a circular arc slot 58 whose circular center is positioned at the vertical pivot pin 54. A stop bolt 59 is passed vertically through the hole oE the bracket 52 and the arc slot 58 and its screw end part beyond the arc slot 58 is engaged with a stop nut 60. The pivotable mount plate 56 is fixed wit:h respect to the bracket 52 by screwing up the bolt 59 and the nut 60.
In this embodiment, in order to twist the endless belt 1 in the return path lb with respect to the moving direction of the belt 1, the nut 60 is loosened, and the pivot lever 57, i.e., the roller support 53 is pivoted at a proper angle around the pivot pin 54 so that the twisting roller 55 may be inclined with respect to the moving direction of the belt 1. Then, the nut 60 is tightened again in order to fix the twisting roller 55 inclined.
Although one twisting roller 55 is mounted to the bottom of the lower chamber 51a of the second support frame 51, a plurality of twisting rollers can be-arranged in the lower chamber 51a of the second support frame 51, as occasion demands.
In this embodiment of this aspect of the present invention, described above, although the second bulk material 27 is fed to the opened endless bçlt 1 by using the first belt conveyer 26, a hopper (not shown) can be used instead of the belt conveyer 26. Further, the second bulk material 27 can be scraped off by a discharging plate (not shown) which is crossed horizontally and diagonally over the flattened endless belt 1, instead of the discharging means 5 which comprises the discharging rollers.
In Figs. 12 - 14 another embodiment of an apparatus is shown for transferring bulk material in two directions using a flexible tubular endless belt according to another aspect of the present invention, which possesses the same construction as the first embodiment of the apparatus shown in Figs. 1 - 11, except that the endless belt 1 is twisted through 180 degrees as the flattened form by first and second twisting means which comprise a plurality of turnover rollers, as hereinafter described in detail.
In this embodiment, after discharging the first bulk material 15 from the opened endless belt 1 into the receiver 17 around the upper drum 3, the flattened endless belt 1 is passed through the first guide roller 4, third guide rollers 65, and a tension roller 66 in the return path lb.
The tension force is given to the tension roller 66 by a weight 70 which is ;27~
hung on the tension roller 66 via a pivot shaft.
Afte-r passing around the latter third guide roller 65, the flattened endless belt l whose inside surface faces downwards, is gradually twisted or turned over through 180 degrees by the first twisting means which comprises pairs of first turnover rollers 67. Each turncver roller 67 is provided with flanges 67a in its both ends, which prevent the flexible tubular endless belt 1 from its slipping off.
Each pair of turnover rollers 67 holds the flattened endless belt l therebetween. The inclination angle of each pair of turnover rollers 67 is increased gradually in one direction as the endless belt l is passed therethrough in the return path lb, as clearly shown in Fig. 13.
This turnover of the flattened endless belt l is usually carried out in a distance which is approximately twenty times as long as the width of the belt 1, and this distance can ~e, of course, varied as occasion demands.
Onto the flattened endless belt l, which has been turned over upside down by the first turnover rollers 67, as described above, the second bulk material 27 is fed by the first belt conveyer 26, in the same manner as the first e~bodiment, as shown in Fig. 14.
Then, the endless belt l completely enclosing the second bulk material 27 is moved to the discharge means 5 through the lower chambers 7b of the first support frames 7, and the second bulk material 27 is discharged from the opened endless belt l to the second belt conveyer 30 in the discharge means 5, in the same manner as the first embodiment.
After passing through the discharge means 5, the flattened endless belt 1 is twisted or tuIned over through 180 degrees by the second tWistillg means comprising second turnover rollers 69, each having the same _ 13 -` - :
construction as the first turnover roller 67, in the same manner as the first twisting means described above in the return path lb. Then, the turned-over endless belt 1 is returned to the lower drum 2 through the second guide roller 6.
,.
1,
Claims (8)
1. An improvement in a method for transferring bulk material in two directions using a flexible tubular endless belt, wherein a tubular form flexible tubular endless belt is extended between loading and unloading points spaced apart from one another by a predetermined distance at any height, and is opened at the loading and the unloading points, and wherein both side edges of said flexible tubular endless belt, which overlap one another along its longitudinal direction, are positioned upwards in the forward path, the improvement which comprises the steps of:
(a) twisting said flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path;
(b) loading bulk material into said flexible tubular endless belt so opened;
(c) transferring the bulk material enclosed within said tubular form flexible tubular endless belt;
(d) unloading the bulk material from said flexible tubular endless belt after it has been opened again; and (e) again twisting said flexible tubular endless belt through 180 degrees in the return path before it reaches the loading point.
(a) twisting said flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path;
(b) loading bulk material into said flexible tubular endless belt so opened;
(c) transferring the bulk material enclosed within said tubular form flexible tubular endless belt;
(d) unloading the bulk material from said flexible tubular endless belt after it has been opened again; and (e) again twisting said flexible tubular endless belt through 180 degrees in the return path before it reaches the loading point.
2. A method as defined in claim 1, wherein the step of twisting said flexible tubular endless belt is effected by twisting rollers as said belt is maintained in a tubular form.
3. A method as defined in claim 1, wherein the steps of twisting said flexible tubular endless belt is effected by turnover rollers as said belt is maintained in a flat form.
4. An improvement in an apparatus for transferring bulk material in two directions using a flexible tubular endless belt, wherein a tubular form flexible tubular endless belt is extended between loading and unloading points spaced apart from one another by a predetermined distance at any height, and is opened at the loading and the unloading points, and wherein both side edges of the flexible tubular endless belt, which overlap one another along its longitudinal direction, are positioned upwards in the forward path, the improvement which comprises:
(a) first twisting means for twisting said flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path;
(b) means for feeding bulk material into said flexible tubular endless belt so opened;
(c) means for rolling up said flexible tubular endless belt so as to wrap completely the bulk material therein;
(d) support rollers for supporting said tubular form flexible tubular endless belt transferring the bulk material in the return path;
(e) means for opening said tubular form flexible tubular endless belt;
(f) means for discharging the bulk material from the so opened flexible tubular endless belt; and (g) second twisting means for again twisting said flexible tubular endless belt through 180 degrees in the return path before it reaches the loading point.
(a) first twisting means for twisting said flexible tubular endless belt after it has passed through the unloading point through 180 degrees in the return path;
(b) means for feeding bulk material into said flexible tubular endless belt so opened;
(c) means for rolling up said flexible tubular endless belt so as to wrap completely the bulk material therein;
(d) support rollers for supporting said tubular form flexible tubular endless belt transferring the bulk material in the return path;
(e) means for opening said tubular form flexible tubular endless belt;
(f) means for discharging the bulk material from the so opened flexible tubular endless belt; and (g) second twisting means for again twisting said flexible tubular endless belt through 180 degrees in the return path before it reaches the loading point.
5. An apparatus as defined in claim 4, wherein said twisting means comprises turnover rollers for turning over the flattened flexible tubular endless belt through 180 degrees.
6. An apparatus as defined in claim 4, wherein said twisting means comprises twisting rollers for twisting said tubular form flexible tubular endless belt through 180 degrees.
7. An apparatus as defined in claim 4, wherein said discharging means comprises a plurality of rollers which are aligned downwards in a trapezoidal form in cross-section, and on which said flattened flexible tubular endless belt is adapted to move downwards in a roundabout path.
8. An apparatus as defined in claim 5, wherein each turnover roller is provided with flanges in its both ends in order to prevent said flexible tubular endless belt from slipping off said roller.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20422081A JPS58104808A (en) | 1981-12-17 | 1981-12-17 | Shuttle conveying method by pipe conveyer and shuttle conveying pipe conveyer device |
| JP56-204219 | 1981-12-17 | ||
| JP56204219A JPS58104807A (en) | 1981-12-17 | 1981-12-17 | Shuttle conveying method by pipe conveyer and shuttle conveying pipe conveyer device |
| JP56-204220 | 1981-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1195279A true CA1195279A (en) | 1985-10-15 |
Family
ID=26514343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417858A Expired CA1195279A (en) | 1981-12-17 | 1982-12-16 | Method and apparatus for transferring bulk material to and from both ways using a tubular belt |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU539533B2 (en) |
| BR (1) | BR8207351A (en) |
| CA (1) | CA1195279A (en) |
| DE (1) | DE3246637A1 (en) |
| FR (1) | FR2518508A1 (en) |
| GB (1) | GB2115364B (en) |
| IN (1) | IN157536B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3531069C1 (en) * | 1985-08-30 | 1987-04-02 | Paurat F | Endless hose conveyor guided over two reversing stations, especially for underground operations |
| JPH0811604B2 (en) * | 1986-11-28 | 1996-02-07 | 株式会社ブリヂストン | Belt guide device for pipe conveyor |
| JPH0784247B2 (en) * | 1986-12-02 | 1995-09-13 | 株式会社ブリヂストン | Belt conveyor equipment |
| US5042646A (en) * | 1989-10-13 | 1991-08-27 | R. A. Beatty & Associates Pty. Ltd. | Pipe conveyor apparatus |
| JPH03272903A (en) * | 1990-03-23 | 1991-12-04 | Nippon Pipe Conveyor Kenkyusho:Kk | Pipe conveyor |
| DE4028469C2 (en) * | 1990-09-07 | 1997-07-17 | Koch Transporttechnik Gmbh | Pipe conveyor |
| DE4042032A1 (en) * | 1990-12-28 | 1991-10-10 | Roland Prof Guenther | Belt type conveyor system - has belt formed to circular cross=section by groups of guide rollers |
| DE102004040199B4 (en) * | 2004-08-17 | 2016-09-01 | Flsmidth Koch Gmbh | Conveyor, in particular hose conveyor |
| DE102008024915B3 (en) * | 2008-05-23 | 2009-06-25 | Takraf Gmbh | Conveyor belt steering device for tubular belt conveyor for position correction of conveyor belt in closed condition, has adjustment mechanism, where geometry of mechanism is selected such that lower carrier roller causes steering movement |
| EP3108757A1 (en) * | 2015-06-23 | 2016-12-28 | International Tobacco Machinery Poland Sp. z o.o. | System of devices for a tobacco industry production installation |
| US11685606B2 (en) * | 2020-09-25 | 2023-06-27 | Valco Industries, Inc. | Tube conveyor system |
| CN114379117B (en) * | 2021-12-31 | 2023-03-21 | 公元股份有限公司 | Lining belt feeding mechanism of composite pipe production equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1067365B (en) * | 1960-03-10 | J. Pohlig Aktiengesellschaft, Köln - Zollstock | Measure for turning the lower run of the conveyor belt | |
| GB571210A (en) * | 1943-05-05 | 1945-08-13 | Henry Stinson Johns | Improvements in or relating to conveying apparatus |
| DE925100C (en) * | 1952-02-15 | 1955-03-10 | Buckau Wolf Maschf R | Trough conveyor |
| GB762500A (en) * | 1953-01-02 | 1956-11-28 | Eickhoff Geb | Means for driving a bottom belt conveyor |
| FR1401960A (en) * | 1963-04-09 | 1965-06-11 | Pneumatiques, Caoutchouc Manufacture Et Plastiques Kleber Colombes | Device for turning conveyor belts |
| FR1445193A (en) * | 1965-08-23 | 1966-07-08 | Bulk material transport method and device | |
| CA1169802A (en) * | 1981-02-18 | 1984-06-26 | Kunio Hashimoto | Method and device for preventing a flexible tubular belt from twisting for use in a tubular belt conveyer |
-
1982
- 1982-12-14 AU AU91503/82A patent/AU539533B2/en not_active Ceased
- 1982-12-15 GB GB08235693A patent/GB2115364B/en not_active Expired
- 1982-12-16 DE DE19823246637 patent/DE3246637A1/en not_active Withdrawn
- 1982-12-16 CA CA000417858A patent/CA1195279A/en not_active Expired
- 1982-12-16 FR FR8221120A patent/FR2518508A1/en not_active Withdrawn
- 1982-12-17 BR BR8207351A patent/BR8207351A/en unknown
- 1982-12-17 IN IN1455/CAL/82A patent/IN157536B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB2115364B (en) | 1985-09-11 |
| BR8207351A (en) | 1983-10-18 |
| AU539533B2 (en) | 1984-10-04 |
| IN157536B (en) | 1986-04-19 |
| AU9150382A (en) | 1983-06-23 |
| GB2115364A (en) | 1983-09-07 |
| FR2518508A1 (en) | 1983-06-24 |
| DE3246637A1 (en) | 1983-06-30 |
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