CA1228320A - Cylindrical conveyor belt - Google Patents
Cylindrical conveyor beltInfo
- Publication number
- CA1228320A CA1228320A CA000471119A CA471119A CA1228320A CA 1228320 A CA1228320 A CA 1228320A CA 000471119 A CA000471119 A CA 000471119A CA 471119 A CA471119 A CA 471119A CA 1228320 A CA1228320 A CA 1228320A
- Authority
- CA
- Canada
- Prior art keywords
- portions
- cylindrical
- conveyor belt
- slant
- transverse direction
- 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
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/40—Belts or like endless load-carriers made of rubber or plastics troughed or tubular; formed with joints facilitating troughing
-
- 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
- B65G29/00—Rotary conveyors, e.g. rotating discs, arms, star-wheels or cones
-
- 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
-
- 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
- B65G2201/06—Articles and bulk
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Belt Conveyors (AREA)
- Structure Of Belt Conveyors (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The cylindrical conveyor belt of the present invention is endless and comprises in transverse section a central conveyor portion and a pair of lug portions formed integrally at both side ends of the conveyor portion, the paired lug portions being joined and contacted with each other to render the conveyor portion cylindrical, the conveyor portion comprising in transverse section a most centrally positioned bottom portion which constitutes a bottom of the cylindrical shape, a pair of side portions positioned on both sides of the bottom portion and constituting side walls of the cylindrical shape, a pair of slant portions positioned outside the paired side portions and constituting slant upper walls of the cylindrical shape, and neck portions positioned between the paired slot portions and the lug portions and constituting an opening in the cylindrical shape, the rigidity of the neck portions in the transverse direction being smaller than that of the bottom, side, slant and lug portions in the transverse direction.
The cylindrical conveyor belt of the present invention is endless and comprises in transverse section a central conveyor portion and a pair of lug portions formed integrally at both side ends of the conveyor portion, the paired lug portions being joined and contacted with each other to render the conveyor portion cylindrical, the conveyor portion comprising in transverse section a most centrally positioned bottom portion which constitutes a bottom of the cylindrical shape, a pair of side portions positioned on both sides of the bottom portion and constituting side walls of the cylindrical shape, a pair of slant portions positioned outside the paired side portions and constituting slant upper walls of the cylindrical shape, and neck portions positioned between the paired slot portions and the lug portions and constituting an opening in the cylindrical shape, the rigidity of the neck portions in the transverse direction being smaller than that of the bottom, side, slant and lug portions in the transverse direction.
Description
~2Z83ZO
TITLE OF THE INVENTION
CYLINDRICAL CONVEYOR BELT
BACKGROUND OF THE INVENTION
Field of the Invention;
The present invention relates to an improvement of a cylindrical conveyor belt.
A cylindrical conveyor belt comprises a central conveyor portion and a pair of lug portions formed integrally at both side ends of the conveyor portion, with the fore and rear ends thereof being joined to form an endless belt. During use of such cylindrical conveyor belt, the belt is guided and transformed by guide rollers or the like, whereby the conveyor portion is held cylindrical and the paired lug portions formed at both side ends of the conveyor portion are joined and contacted with each other. And objects are conveyed by the cylindrical conveyor portion.
Description of the Prior Art;
In conventional cylindrical conveyor belts, the paired lug portions are made larger in wall thickness than the conveyor portion, or inclined at a certain angle relative to the conveyor portion, thus requiring a special mold for vulcanization-molding of the lug portions. Moreover, because the conveyor portion or and the lug portion are different in thickness and shape, the cylindrical conveyor belt after manufacture becomes bulky and difficult to pack and transport.
Further, when the conveyor belt is bent with pulley during operation, the thick-walled or inclined lug portion may undergo a large distortion, thus causing an abnormal deformation of the lug portions.
Additionally, during a curved travel of the conveyor belt, both side portions come close to each other. For example, as shown in Fugue, the sectional area is reduced to a large extent due to rise of slant portions 101 and to bend of a bottom portion 10~.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a conveyor belt having a conveyor portion which forms a cylindrical shape close to a true round.
A further object of the present invention it to provide a cylindrical conveyor which does not require a mold of a complex structure in the manufacturing process, for example, in the vulcanizing step.
A still further object of the invention is to simplify the packing and transport of the cylindrical conveyor belt.
Another object of the invention is to prevent abnormal distortion from acting on the lug and neck portions and provide a cylindrical conveyor belt having lZ283ZO
highly durability thereby.
The cylindrical conveyor belt of the present invention is endless and comprises in transverse section a central conveyor portion and a pair ox lug portions formed integrally at both side ends of the conveyor portion, the paired lug portions being joined and contacted with each other to render the conveyor portion cylindrical, the conveyor portion comprising in transverse section a most centrally positioned bottom portion which constitutes a bottom of the cylindrical shape, a pair of side portions positioned on both sides of the bottom portion and constituting side walls of the cylindrical shape, a pair of slant portions positioned outside the paired side portions and constituting slant upper walls of the cylindrical shape, and neck portions positioned between the paired slant portions and the lug portions and constituting an opening in the cylindrical shape, the rigidity of the neck portions in the transverse direction being smaller than that of the bottom, side, slant and lug portions in the transverse direction.
BRIEF DESCRIPTION OF THE DRAWINGS;
Foggily is a sectional view of principal portions of a cylindrical conveyor belt according to a first embodiment of the present invention;
Fugue is a sectional view of principal 12Z83~0 portions of the cylindrical conveyor belt of Foggily as loaded to a cylindrical conveyor device;
Foe is a sectional view of principal portions of a cylindrical conveyor belt according to a second embodiment of the present invention;
Fugue is a sectional view of principal portions of a cylindrical conveyor belt according to a third embodiment of the present invention;
Figs is a sectional view of the cylindrical conveyor belt of the third embodiment as loaded to a cylindrical conveyor device:
Fugue is a sectional view of principal portions showing a modification of the cylindrical conveyor belt of the third embodiment;
Fugue is a sectional view of a cylindrical conveyor belt according to a fourth embodiment of the present invention;
Fugue is a sectional view of principal portions of the cylindrical conveyor belt of the fourth embodiment as loaded to cylindrical conveyor device;
Fugue is a sectional view of a cylindrical conveyor belt according to a fifth embodiment; and Fugue is a schematic sectional view of a conventional conveyor belt during curved travel.
DETAILED DESCRIPTION OF THE INVENTION
The cylindrical conveyor belt of the present SUE
invention is endless and is in the shape of a relatively thick-walled sheet having an almost constant thickness in transverse section. It comprises in transverse section a most centrally positioned bottom portion which constitutes a bottom when the belt is bent cylindrically, a pair of side portions which constitute side walls when the belt is bent cylindrically, a pair of slant portions positioned outside the paired side portions and constituting upper oblique walls of the cylindrical shape, neck portions positioned outside the paired slant portions and constituting an opening in the cylindrical shape, and lug portions formed in the outermost positions.
The cylindrical conveyor belt has about the same wall thickness in its transverse section. In appearance, therefore, the bottom, side, slant, neck and lug portions are not clearly divided except special cases.
In the cylindrical conveyor belt of the present invention, the above constituent portions of the belt are changed in rigidity in the transverse direction, whereby a cylindrical shape close to a true round is maintained in a cylindrically bent condition of the belt.
The lug portions are joined and contacted with each other in a cylindrically bent condition of the belt, thereby closing the opening end of the cylindrical ~2Z8320 shape. More particularly, when the belt is in use, the lug portions are pressed strongly from the respective outer surfaces by means of rotating rollers or the like and are joined thereby. End faces of the lug portions are pressed by an end roller.
As to the width of the lug portions, it is decided according to the entire size of the conveyor belt, object to be conveyed, etch In general, it is suitable that the width of each lug portion be in the range of about 2 to 10, assuming that the length in the transverse direction of the conveyor portion which forms the cylindrical shape is 100.
The inner surfaces of the lug portions contact each other, and pressure rollers come into contact with the outer surfaces of the lug portions.
Therefore, it is preferable that the inner and outer surfaces of the lug portions be formed of a material higher in abrasion resistance than the other constituent portions of the conveyor belt. It is also preferable that the lug portions have a high rigidity in the transverse direction, in order to minimize warp or the like in the transverse direction.
The neck portions, which are positioned inside the lug portions, define an opening in the conveyor portion when bent cylindrically. The neck portions undergo the largest bending force in the transverse direction so that the inner surfaces are ~Z283ZO
conveyed, unlike the other constituent portions of the conveyor belt. Also as to the width of the neck portions, an optimum value can be obtained according to the purpose of use of the conveyor belt, etc. In general, it is suitable that the width (length in the transverse direction; of each neck portion be in the range of about 0.5 to lo assuming that the length in the transverse direction of the conveyor portion which forms the cylindrical shape is Lowe As to the rigidity of the neck portions, it will be explained later as the whole of the conveyor portion.
The slant portions, positioned between the neck and side portions, constitute upper slant arcuate portions when the conveyor portion is bent cylindrically. It is suitable that the width of each slant portion be in the range of about 10 to 15, assuming that the length in the transverse direction of the conveyor portion is lo.
The side portions constitute side walls in a cylindrically bent state of the conveyor belt. It is suitable that the length in the transverse direction of each side portion be in the range of about 20 to 30, assuming that the entirety of the conveyor belt portion is 100.
The bottom portion constitutes a bottom of the belt in a cylindrically bent state, and it is suitable that the length in the transverse direction of ~Z8320 the bottom portion be in the range of about 20 to 30, assuming that the conveyor belt portion is 100.
In the present invention, the rigidity in the transverse direction of the neck portions described above is smaller than any other constituent portions, including lug portions, of the conveyor belt. That is, the neck portions are formed soft.
As one index indicating the rigidity of conveyor belt, there has been known a trough performance testing method based on the Japan Rubber Association Standard. Here the trough performance was measured as follows according to the Standard. A rectangular test piece, 1~0 mm in belt width in the longitudinal direction and 900 mm in belt width in the transverse direction (L mm), was suspended at the four corners thereof by hanger means, and an average value (F mm) of deflection at the center of the test piece was measured.
The trough performance T of this test piece is determined from T = F / L. It takes a large value when the rigidity is small, that is, when the belt is soft.
The rigidity in the transverse direction of the conveyor belt of the present invention is represented by this trough performance T. The rigidity trough performance) of each constituent portion will be explained below on the basis of the trough performance of the bottom portion which corresponds to the most central part of the cylindrical conveyor belt.
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Assuming that the trough performance of the bottom portion in the transverse direction is 100, the trough performance of the neck portions is preferably in the range of 150 to 400. The thickness of the neck portions may be made thin as compared with the other constituent portions of the conveyor belt to enhance the trough performance. In this case, it is preferable that a longitudinally extending groove be formed in at least one face of each neck portion.
In terms of trough performance, the rigidity in the transverse direction of the slant portions is preferably in the range of 50 to 110, assuming that the trough performance of the bottom portion is 100.
The trough performance of the side portions is preferably in the range of 120 to 200.
In the cylindrical conveyor belt of the present invention, it is the neck portions that contribute most greatly to the attainment of the conveyor portion close to a true round. Because the thickness in the transverse direction of the conveyor belt is restricted within a certain range and the sectional shape is like a flat plate, a large bending distortion inevitably acts on the neck portions. The reason why the neck portions are made soft is that it is intended to facilitate such bending deformation.
The conveyor belt may be constructed so that the rigidity of only the neck portions is small and the ~ZZ8320 other portions have almost the same rigidity bigger than the rigidity of the neck portions. In such a conveyor belt of a plate-like section in which only the neck portions are made soft, the roundness in a cylindrically transformed state of the belt is relatively low, but this construction is applicable to a conveyor belt with less curved travel such as a cylindrical conveyor belt for straight travel.
Further, in order that the cylindrical conveyor belt may have a high roundness, it is necessary that the side portions be made small in rigidity next to the neck portions. And for drawing the cylindrical shape close to a true round, the rigidity of the slant portions should be made higher than that of the bottom portion. In conventional conveyor belts, as shim in Fugue, side portions tend to rise during a curved travel of the belt. By making the slant and bottom portions harder than the side portions, the slant and side portions are maintained so as to extend in the horizontal direction, thereby allowing the side portions to bend.
The rigidity in the transverse direction of the cylindrical conveyor belt can be changed by increasing an decreasing the number of reinforcing layers embedded in the transverse direction, or by a combination use of both a reinforcing layer having a high rigidity and a reinforcing layer having a small ~zZ83Zo rigidity. In order to maintain the integrity of the whole of the cylindrical conveyor belt in the transverse direction, it is preferable that at least one centrally disposed reinforcing layer be in communication with the the neck portions in the transverse direction.
As to the rigidity in the longitudinal direction of the entire cylindrical conveyor belt, it is preferably as uniform as possible. It is preferable that the lug, neck, slant, side and bottom portions be equal in rigidity in the longitudinal direction, but they may have different longitudinal rigidities. For example, the rigidity in the longitudinal direction of each constituent portion of the belt may be made equal to the rigidity thereof in the transverse direction.
As to material such as reinforcing layers an rubber which constitute the cylindrical conveyor belt of the present invention, those used in conventional conveyor belts and cylindrical conveyor belts may be used as they are.
As rollers for transforming the conveyor belt of the invention into a cylindrical form, it is preferable to use, as shown in Fugue, five cylindrical shape guide rollers which are brought into abutment with the outer surfaces of the slant, side and bottom portions, a pair of gripping rollers for gripping the outer surfaces of the lug portion, and an end roller for restricting the end faces of the lug portions. More ~ZZ83ZO
preferably, a pair of additional guide rollers are provided between the buttonhole portion and the side portion.
The cylindrical conveyor belt of the present invention is in the form of a sheet which is almost equal in wall thickness throughout its transverse section, and thus there is no partially thicker portion in the transverse direction. Consequently, a mold of a simpler structure can be used in the manufacturing process, for example, in the vulcanizing step, and the packing and transport ox the cylindrical conveyor belt become extremely easy. Moreover, when the belt is used in a cylindrically bent condition, no abnormal distortion acts on the lug and neck portions, so the belt becomes highly durable. Further, since the constituent portions of the cylindrical conveyor belt are made different in transverse rigidity to a predetermined degree, the cylindrical shape defined by the belt approaches to a true round, thus facilitating the conveyance ox object by the cylindrical conveyor belt. Even in a curved travel of the cylindrical conveyor belt, a relatively circular section is maintained.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Foggily is a sectional view of principal ~Zz83~
portions of a cylindrical conveyor belt according to a first embodiment of the present invention. This cylindrical conveyor belt has a total width of 136 cm, a thickness of 20 mm and a length of about 50 m. Of the total width of 136 cm, about 110 cm is the width of a central portion 1, about 5 cm is the width of each of neck portions 3 positioned on both sides of the central portion 1, and about 6 cm is the width of each of lug portions 2 positioned at both ens of the belt. the conveyor portion which forms a cylindrical shape is composed of the central portion 1 and the neck portions 3 which are positioned on both sides of the central portion. The thickness of the conveyor belt is about 20 mm at any part of the belt. In this cylindrical conveyor belt are embedded two central reinforcing layers 4 formed of canvas in communication with the central portion 1, neck portions 3 and lug portions 2. And in the central portion 1 are embedded side reinforcing layers S two each on both sides of the central reinforcing layers 4, the side reinforcing layers 5 being also formed of canvas. Further, also in each lug portion 2 are formed side reinforcing layers 6 two each on both sides of the central reinforcing layers 4, the side reinforcing layers 6 being also formed of canvas.
In both side reinforcing layers 5 and 6, the layers close to the belt faces are shorter in width than those close to the central part. Therefore, in each neck SUE
portion 3, the portion formed of only rubber not containing the side reinforcing layers 5 and 6 becomes wider toward the belt faces.
The canvas which constitutes the reinforcing layers 4, 5 and 6 is of a half mat weave obtained by using polyester fibers as warp and nylon G as weft. The strength in the longitudinal direction warp direction) of this canvas is not lower than 430 kg / 3 cm and its strength in the transverse direction (weft direction) is not less than 295 kg / 3 cm. As the rubber there was used a blend rubber comprising a mixture of natural rubber and styrene-butadiene rubber. The rubber hardness was about Ho 65.
This cylindrical conveyor belt was fabricated using the same belt press as that used in the manufacture of a conventional plate-like conveyor belt.
More particularly, unvulcanized surface cover rubber, the central and side reinforcing layers 4, 5 and 6 formed of canvas were laminated on the surface of a lower mold of the belt press in a known manner, followed press by application of heat and prccs~lre by the belt pressure to vulcanize and mold a certain length of belt portion.
Belt portions thus molded were successively moved to obtain the cylindrical conveyor belt of this embodiment having a length of about 50 m. In this belt, the trough performance of the central and lug portions 1 and 2 was 0.141 and that of the neck portions 3 was about 0.280.
~2Z~3320 This cylindrical conveyor belt was loaded to a conventional cylindrical conveyor device and thereby transformed into a cylindrical shape as shown in Fugue.
In the cylindrical conveyor belt of this first embodiment, the conveyor portion composed of the central portion 1 and the neck portions 3 is transformed into a Sue generally circular shape by I cylindrical-shape guide rollers 7, and the lug portions 2 are joined and contacted with each other by a pair of gripping rollers 8 and end face positions thereof are restricted by an end face restricting roller 9.
In the cylindrical conveyor belt of this first embodiment, as shown in Fugue, deforming stresses of the central portion 1 and lug portions 2 are absorbed by the neck portions 3 where the side reinforcing layers are not present, thereby eliminating the inconvenience of floating of the lug portions 3. Further, a compressive force tends to act on the neck portions 3, and it was confirmed unnecessary to consider damage, etc. induced by tensile stress at the neck portions 3.
EXP~IPLE 2 Fugue is a sectional view of principal portions of a cylindrical conveyor belt according to a second embodiment of the present invention.
In the cylindrical conveyor belt of this embodiment, as compared with that of the first embodiment, lug portions 11 have a modified structure.
More specifically, in the lug portions 11 are not formed side reinforcing layers, and instead there were formed surface layers 10 containing an abrasion-resistant member which is a rubber composition comprising a 6:4 blend of butadiene rubber and natural rubber. The construction of the central portion 1 and neck portions 3 is just the same as in the cylindrical conveyor belt of the first embodiment. The trough performance of the central portion 1 and that of the neck portions 3 in this embodiment are the same as in the first embodiment, namely, 0.141 and 0.280, respectively, and the trough performance of the lug portions 11 is 0.210.
In the cylindrical conveyor belt ox this embodiment, since the surfaces of the lug portions 11 are formed by the surface layers 10 which contains the abrasion-resistant member, the wear at the lug portions 11 is diminished and the durability of the same portions is improved.
Fugue is a sectional view of principal portions of a cylindrical conveyor belt according to a third embodiment of the present invention. In this cylindrical conveyor belt, as compared with that of the first embodiment, neck portions 12 have a modified structure. More specifically, a longitudinally extending , . . .
~2Z8320 groove 13 of a semi-circular section is formed in the outer surface of each neck portion 12. The grooves 13 facilitate bending of the neck portions 12 when the belt is transformed into a cylindrical shape as shown in Fugue. In both outer and inner surfaces of each neck portion 14 there may be formed longitudinally extending grooves 15 and 16 as shown in Fugue.
Phase is a sectional view of a cylindrical conveyor belt according to a fourth embodiment of the present invention. This belt has a length of 30 m, a total width of 110 cm, and a uniform thickness of 14 mm.
The cylindrical conveyor belt of this embodiment comprises, in its transverse structure, a bottom portion 17, side portions 18 which constitute both sides of the bottom portion, slant portions 19, neck portions 20 and lug portions 21, which are arranged successively outwards from the central part. The length in the transverse direction of the bottom portion 17 is 275 mm, that of each of the two side portions 18 is 165 .t1.5 mm, that of each of the two slant portions 19 is 1~7 mm, that of each of the two neck portions 20 is 30 mm and that of each of the two lug portions 21 is 70 mm.
As reinforcing layers there were used two kinds of cloths, one being a tension-resistant cloth indicated by thick solid lines and the other being a ~LZ283~
high elongation cloth indicated by dotted lines. The tension-resistant cloth comprises polyester warp and nylon weft and exhibits 1.5 to 2 % elongation under 40 kg load. The high elongation cloth comprises high elongation nylon warp and ordinary nylon weft and exhibits about 20 elongation under a load of about 10 kg/cm.
In the sectional view of Fugue, the upper surfaces serves as an object conveying surface, and the lower surface becomes an outside surface when the conveyor belt is transformed into a cylindrical shape.
In the central portion 17 of the conveyor belt are embedded a tension-resistant cloth 22 having a width of 220 mm centrally in the thickness direction, a tension-resistant cloth 23 overlying the cloth 22 and having a width of 330 mm, and a high elongation cloth 24 underlying the cloth 22 and having a width of 900 mm. In each side portion 18 are embedded a high elongation cloth 25 portioned centrally in the thickness direction adjacent the tension-resistant cloth 22 in the central portion 17 and having a width of 220 mm, a high elongation cloth 26 overlying the cloth 25 and having a width of 110 mm, and the aforementioned high elongation cloth 24 underlying the cloth 25. In each slant portion 19 are embedded a tension-resistant cloth 27 having a width of 220 mm centrally in the thickness direction, a tension-resistant cloth 28 overlying the cloth 27 and , . .
~Z2~33~) having a width of 275 mm, a tension-resistant cloth 29 overlying the cloth 28 and having a width of 150 mm, and the aforementioned high elongation cloth 24 underlying the cloth 27. In each neck portion 20 are embedded only the tension-resistant cloth 27 positioned centrally and the tension-resistant cloth 28 overlying the cloth 27.
In each lug portion 21 are embedded the aforementioned tension-resistant cloths 27 and 28 as well as a tension-resistant cloth 30 overlying them and a tension-resistant cloth 31 underlying them. In this conveyor belt, the thickness of the upper surface-side cover rubber of the central and side portions 17 and 18 is 6 mm and that of the slant and lug portions 19 and 21 is 4 mm, while the cover rubber thickness on the lower surface side is 4 mm except the neck portions 20. The cover rubber hardness is about Ho 56.
The trough performances of the bottom, side, slant, neck and lug portions 17, 18, 19, 20 and 21 were 0.220, 0.270, 0.160, 0.282 and 0.143, respectively.
This cylindrical conveyor belt was also fabricated in the same way as in the manufacture ox the cylindrical conveyor belt of the first embodiment.
It was loaded to a conveyor device and thereby transformed into a cylindrical shape, as shown in Fugue.
The conveyor portion is transformed into a generally round shape by five cylindrical-shape guide ~Z283Zo rollers 7, the lug portions 21 are joined and contacted with each other by a pair of gripping rollers 8, and end face positions of the lug portions 21 are restricted by the end-face roller 9.
The cylindrical conveyor belt of this embodiment was transformed into a substantially round shape by the five cylindrical-shape guide rollers, and it could be maintained in a shape relatively close to a true round even at curved travel portions of the conveyor device.
Fugue is a sectional view of a cylindrical conveyor belt according to a fifth embodiment of the present invention. This belt has a length of 50 m, a total width of 138 cm and a uniform thickness of about 15 mm.
The cylindrical conveyor belt of this embodiment comprises, in its transverse structure, a bottom portion 32, side portions 33 which constitute both sides of the bottom portion, slant portions 34, neck portions 35 and lug portions 36, which are arranged successively outwards from the central part. The length in the transverse direction of the bottom portion 32 is 350 mm, that of each of the two side portions 33 is 250 mm, that of each of the two slant portions 34 is 175 mm, that of each ox the two neck portions 35 is 30 mm and Sue that of each of the two lug portions 36 is 60 mm.
As reinforcing layers there were used two kinds of cloths, one being a tension-resistant cloth indicated by thick solid lines and the other being a high elongation cloth indicated by dotted lines. Both cloths are the same as those used in Example 4.
In the sectional view of Fugue, the upper surface serves as an object conveying surface, and the lower surface becomes an outside surface when the conveyor belt is transformed into a cylindrical shape.
In the central portion 32 of the conveyor belt are embedded, successively from above to below in the thickness direction, a tension-resistant cloth 37 having a width of 450 mm, a tension-resistant cloth 38 having a width of 350 mm, a tension-resistant cloth 39 having a idth of 250 mm and a high elongation cloth 40 having a O
width of mm. In each side portion 33 are embedded a high elongation cloth 41 having a width of 150 mm, a high elongation cloth 42 having a width of 250 mm and a high elongation cloth 43 having a width of 350 mm which are positioned sideways adjacent the tension-resistant cloths 37, 38 and 39, respectively in the central portion 32, as well as the aforementioned high elongation cloth 40 below those high elongation cloths.
In each slant portion 34 are embedded a tension-resistant cloth 44 having a width of 225 my a tension-resistant cloth 45 having a width of to mm and a Swiss ~15 tension-resistant cloth 46 having a width of ~20 mm which are positioned sideways adjacent the high elongation cloths 41, 42 and 43 respectively in the side portion 33, as well as the aforementioned high elongation cloth below those tension-resistant cloths. In each neck portion 35 are embedded only the above tension-resistant cloths 45 and 46. In each lug portion 36 are embedded the aforementioned tension-resistant cloths 45 and 46 as well as a tension-resistant cloth 47 overlying them and a tension-resistant cloth 48 underlying them. In this conveyor belt, the thickness of the upper surface-side cover rubber is about S mm and that of the lower surface-side cover rubber is about 2 mm. The cover rubber hardness is about Ho 63.
The trough performances of the bottom, side slant, neck and lug portions 32, 33, 34, 35 and 36 were 0.157, 0.195,~0.280 and 0.141, respectively.
This cylindrical conveyor belt was also fabricated in the same manner as in the manufacture of the cylindrical conveyor belt of the first embodiment.
It was loaded to a conveyor device 382 mm in diameter of a cylindrical shape like Fugue.
The cylindrical conveyor belt of this embodiment was transformed into a nearly true round by five cylindrical-shape guide rollers, and it could be maintained in a shape relatively close to a true round ~ZZ83ZO
even at curved travel portions of the conveyor device.
TITLE OF THE INVENTION
CYLINDRICAL CONVEYOR BELT
BACKGROUND OF THE INVENTION
Field of the Invention;
The present invention relates to an improvement of a cylindrical conveyor belt.
A cylindrical conveyor belt comprises a central conveyor portion and a pair of lug portions formed integrally at both side ends of the conveyor portion, with the fore and rear ends thereof being joined to form an endless belt. During use of such cylindrical conveyor belt, the belt is guided and transformed by guide rollers or the like, whereby the conveyor portion is held cylindrical and the paired lug portions formed at both side ends of the conveyor portion are joined and contacted with each other. And objects are conveyed by the cylindrical conveyor portion.
Description of the Prior Art;
In conventional cylindrical conveyor belts, the paired lug portions are made larger in wall thickness than the conveyor portion, or inclined at a certain angle relative to the conveyor portion, thus requiring a special mold for vulcanization-molding of the lug portions. Moreover, because the conveyor portion or and the lug portion are different in thickness and shape, the cylindrical conveyor belt after manufacture becomes bulky and difficult to pack and transport.
Further, when the conveyor belt is bent with pulley during operation, the thick-walled or inclined lug portion may undergo a large distortion, thus causing an abnormal deformation of the lug portions.
Additionally, during a curved travel of the conveyor belt, both side portions come close to each other. For example, as shown in Fugue, the sectional area is reduced to a large extent due to rise of slant portions 101 and to bend of a bottom portion 10~.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a conveyor belt having a conveyor portion which forms a cylindrical shape close to a true round.
A further object of the present invention it to provide a cylindrical conveyor which does not require a mold of a complex structure in the manufacturing process, for example, in the vulcanizing step.
A still further object of the invention is to simplify the packing and transport of the cylindrical conveyor belt.
Another object of the invention is to prevent abnormal distortion from acting on the lug and neck portions and provide a cylindrical conveyor belt having lZ283ZO
highly durability thereby.
The cylindrical conveyor belt of the present invention is endless and comprises in transverse section a central conveyor portion and a pair ox lug portions formed integrally at both side ends of the conveyor portion, the paired lug portions being joined and contacted with each other to render the conveyor portion cylindrical, the conveyor portion comprising in transverse section a most centrally positioned bottom portion which constitutes a bottom of the cylindrical shape, a pair of side portions positioned on both sides of the bottom portion and constituting side walls of the cylindrical shape, a pair of slant portions positioned outside the paired side portions and constituting slant upper walls of the cylindrical shape, and neck portions positioned between the paired slant portions and the lug portions and constituting an opening in the cylindrical shape, the rigidity of the neck portions in the transverse direction being smaller than that of the bottom, side, slant and lug portions in the transverse direction.
BRIEF DESCRIPTION OF THE DRAWINGS;
Foggily is a sectional view of principal portions of a cylindrical conveyor belt according to a first embodiment of the present invention;
Fugue is a sectional view of principal 12Z83~0 portions of the cylindrical conveyor belt of Foggily as loaded to a cylindrical conveyor device;
Foe is a sectional view of principal portions of a cylindrical conveyor belt according to a second embodiment of the present invention;
Fugue is a sectional view of principal portions of a cylindrical conveyor belt according to a third embodiment of the present invention;
Figs is a sectional view of the cylindrical conveyor belt of the third embodiment as loaded to a cylindrical conveyor device:
Fugue is a sectional view of principal portions showing a modification of the cylindrical conveyor belt of the third embodiment;
Fugue is a sectional view of a cylindrical conveyor belt according to a fourth embodiment of the present invention;
Fugue is a sectional view of principal portions of the cylindrical conveyor belt of the fourth embodiment as loaded to cylindrical conveyor device;
Fugue is a sectional view of a cylindrical conveyor belt according to a fifth embodiment; and Fugue is a schematic sectional view of a conventional conveyor belt during curved travel.
DETAILED DESCRIPTION OF THE INVENTION
The cylindrical conveyor belt of the present SUE
invention is endless and is in the shape of a relatively thick-walled sheet having an almost constant thickness in transverse section. It comprises in transverse section a most centrally positioned bottom portion which constitutes a bottom when the belt is bent cylindrically, a pair of side portions which constitute side walls when the belt is bent cylindrically, a pair of slant portions positioned outside the paired side portions and constituting upper oblique walls of the cylindrical shape, neck portions positioned outside the paired slant portions and constituting an opening in the cylindrical shape, and lug portions formed in the outermost positions.
The cylindrical conveyor belt has about the same wall thickness in its transverse section. In appearance, therefore, the bottom, side, slant, neck and lug portions are not clearly divided except special cases.
In the cylindrical conveyor belt of the present invention, the above constituent portions of the belt are changed in rigidity in the transverse direction, whereby a cylindrical shape close to a true round is maintained in a cylindrically bent condition of the belt.
The lug portions are joined and contacted with each other in a cylindrically bent condition of the belt, thereby closing the opening end of the cylindrical ~2Z8320 shape. More particularly, when the belt is in use, the lug portions are pressed strongly from the respective outer surfaces by means of rotating rollers or the like and are joined thereby. End faces of the lug portions are pressed by an end roller.
As to the width of the lug portions, it is decided according to the entire size of the conveyor belt, object to be conveyed, etch In general, it is suitable that the width of each lug portion be in the range of about 2 to 10, assuming that the length in the transverse direction of the conveyor portion which forms the cylindrical shape is 100.
The inner surfaces of the lug portions contact each other, and pressure rollers come into contact with the outer surfaces of the lug portions.
Therefore, it is preferable that the inner and outer surfaces of the lug portions be formed of a material higher in abrasion resistance than the other constituent portions of the conveyor belt. It is also preferable that the lug portions have a high rigidity in the transverse direction, in order to minimize warp or the like in the transverse direction.
The neck portions, which are positioned inside the lug portions, define an opening in the conveyor portion when bent cylindrically. The neck portions undergo the largest bending force in the transverse direction so that the inner surfaces are ~Z283ZO
conveyed, unlike the other constituent portions of the conveyor belt. Also as to the width of the neck portions, an optimum value can be obtained according to the purpose of use of the conveyor belt, etc. In general, it is suitable that the width (length in the transverse direction; of each neck portion be in the range of about 0.5 to lo assuming that the length in the transverse direction of the conveyor portion which forms the cylindrical shape is Lowe As to the rigidity of the neck portions, it will be explained later as the whole of the conveyor portion.
The slant portions, positioned between the neck and side portions, constitute upper slant arcuate portions when the conveyor portion is bent cylindrically. It is suitable that the width of each slant portion be in the range of about 10 to 15, assuming that the length in the transverse direction of the conveyor portion is lo.
The side portions constitute side walls in a cylindrically bent state of the conveyor belt. It is suitable that the length in the transverse direction of each side portion be in the range of about 20 to 30, assuming that the entirety of the conveyor belt portion is 100.
The bottom portion constitutes a bottom of the belt in a cylindrically bent state, and it is suitable that the length in the transverse direction of ~Z8320 the bottom portion be in the range of about 20 to 30, assuming that the conveyor belt portion is 100.
In the present invention, the rigidity in the transverse direction of the neck portions described above is smaller than any other constituent portions, including lug portions, of the conveyor belt. That is, the neck portions are formed soft.
As one index indicating the rigidity of conveyor belt, there has been known a trough performance testing method based on the Japan Rubber Association Standard. Here the trough performance was measured as follows according to the Standard. A rectangular test piece, 1~0 mm in belt width in the longitudinal direction and 900 mm in belt width in the transverse direction (L mm), was suspended at the four corners thereof by hanger means, and an average value (F mm) of deflection at the center of the test piece was measured.
The trough performance T of this test piece is determined from T = F / L. It takes a large value when the rigidity is small, that is, when the belt is soft.
The rigidity in the transverse direction of the conveyor belt of the present invention is represented by this trough performance T. The rigidity trough performance) of each constituent portion will be explained below on the basis of the trough performance of the bottom portion which corresponds to the most central part of the cylindrical conveyor belt.
~ZZ83ZO
Assuming that the trough performance of the bottom portion in the transverse direction is 100, the trough performance of the neck portions is preferably in the range of 150 to 400. The thickness of the neck portions may be made thin as compared with the other constituent portions of the conveyor belt to enhance the trough performance. In this case, it is preferable that a longitudinally extending groove be formed in at least one face of each neck portion.
In terms of trough performance, the rigidity in the transverse direction of the slant portions is preferably in the range of 50 to 110, assuming that the trough performance of the bottom portion is 100.
The trough performance of the side portions is preferably in the range of 120 to 200.
In the cylindrical conveyor belt of the present invention, it is the neck portions that contribute most greatly to the attainment of the conveyor portion close to a true round. Because the thickness in the transverse direction of the conveyor belt is restricted within a certain range and the sectional shape is like a flat plate, a large bending distortion inevitably acts on the neck portions. The reason why the neck portions are made soft is that it is intended to facilitate such bending deformation.
The conveyor belt may be constructed so that the rigidity of only the neck portions is small and the ~ZZ8320 other portions have almost the same rigidity bigger than the rigidity of the neck portions. In such a conveyor belt of a plate-like section in which only the neck portions are made soft, the roundness in a cylindrically transformed state of the belt is relatively low, but this construction is applicable to a conveyor belt with less curved travel such as a cylindrical conveyor belt for straight travel.
Further, in order that the cylindrical conveyor belt may have a high roundness, it is necessary that the side portions be made small in rigidity next to the neck portions. And for drawing the cylindrical shape close to a true round, the rigidity of the slant portions should be made higher than that of the bottom portion. In conventional conveyor belts, as shim in Fugue, side portions tend to rise during a curved travel of the belt. By making the slant and bottom portions harder than the side portions, the slant and side portions are maintained so as to extend in the horizontal direction, thereby allowing the side portions to bend.
The rigidity in the transverse direction of the cylindrical conveyor belt can be changed by increasing an decreasing the number of reinforcing layers embedded in the transverse direction, or by a combination use of both a reinforcing layer having a high rigidity and a reinforcing layer having a small ~zZ83Zo rigidity. In order to maintain the integrity of the whole of the cylindrical conveyor belt in the transverse direction, it is preferable that at least one centrally disposed reinforcing layer be in communication with the the neck portions in the transverse direction.
As to the rigidity in the longitudinal direction of the entire cylindrical conveyor belt, it is preferably as uniform as possible. It is preferable that the lug, neck, slant, side and bottom portions be equal in rigidity in the longitudinal direction, but they may have different longitudinal rigidities. For example, the rigidity in the longitudinal direction of each constituent portion of the belt may be made equal to the rigidity thereof in the transverse direction.
As to material such as reinforcing layers an rubber which constitute the cylindrical conveyor belt of the present invention, those used in conventional conveyor belts and cylindrical conveyor belts may be used as they are.
As rollers for transforming the conveyor belt of the invention into a cylindrical form, it is preferable to use, as shown in Fugue, five cylindrical shape guide rollers which are brought into abutment with the outer surfaces of the slant, side and bottom portions, a pair of gripping rollers for gripping the outer surfaces of the lug portion, and an end roller for restricting the end faces of the lug portions. More ~ZZ83ZO
preferably, a pair of additional guide rollers are provided between the buttonhole portion and the side portion.
The cylindrical conveyor belt of the present invention is in the form of a sheet which is almost equal in wall thickness throughout its transverse section, and thus there is no partially thicker portion in the transverse direction. Consequently, a mold of a simpler structure can be used in the manufacturing process, for example, in the vulcanizing step, and the packing and transport ox the cylindrical conveyor belt become extremely easy. Moreover, when the belt is used in a cylindrically bent condition, no abnormal distortion acts on the lug and neck portions, so the belt becomes highly durable. Further, since the constituent portions of the cylindrical conveyor belt are made different in transverse rigidity to a predetermined degree, the cylindrical shape defined by the belt approaches to a true round, thus facilitating the conveyance ox object by the cylindrical conveyor belt. Even in a curved travel of the cylindrical conveyor belt, a relatively circular section is maintained.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Foggily is a sectional view of principal ~Zz83~
portions of a cylindrical conveyor belt according to a first embodiment of the present invention. This cylindrical conveyor belt has a total width of 136 cm, a thickness of 20 mm and a length of about 50 m. Of the total width of 136 cm, about 110 cm is the width of a central portion 1, about 5 cm is the width of each of neck portions 3 positioned on both sides of the central portion 1, and about 6 cm is the width of each of lug portions 2 positioned at both ens of the belt. the conveyor portion which forms a cylindrical shape is composed of the central portion 1 and the neck portions 3 which are positioned on both sides of the central portion. The thickness of the conveyor belt is about 20 mm at any part of the belt. In this cylindrical conveyor belt are embedded two central reinforcing layers 4 formed of canvas in communication with the central portion 1, neck portions 3 and lug portions 2. And in the central portion 1 are embedded side reinforcing layers S two each on both sides of the central reinforcing layers 4, the side reinforcing layers 5 being also formed of canvas. Further, also in each lug portion 2 are formed side reinforcing layers 6 two each on both sides of the central reinforcing layers 4, the side reinforcing layers 6 being also formed of canvas.
In both side reinforcing layers 5 and 6, the layers close to the belt faces are shorter in width than those close to the central part. Therefore, in each neck SUE
portion 3, the portion formed of only rubber not containing the side reinforcing layers 5 and 6 becomes wider toward the belt faces.
The canvas which constitutes the reinforcing layers 4, 5 and 6 is of a half mat weave obtained by using polyester fibers as warp and nylon G as weft. The strength in the longitudinal direction warp direction) of this canvas is not lower than 430 kg / 3 cm and its strength in the transverse direction (weft direction) is not less than 295 kg / 3 cm. As the rubber there was used a blend rubber comprising a mixture of natural rubber and styrene-butadiene rubber. The rubber hardness was about Ho 65.
This cylindrical conveyor belt was fabricated using the same belt press as that used in the manufacture of a conventional plate-like conveyor belt.
More particularly, unvulcanized surface cover rubber, the central and side reinforcing layers 4, 5 and 6 formed of canvas were laminated on the surface of a lower mold of the belt press in a known manner, followed press by application of heat and prccs~lre by the belt pressure to vulcanize and mold a certain length of belt portion.
Belt portions thus molded were successively moved to obtain the cylindrical conveyor belt of this embodiment having a length of about 50 m. In this belt, the trough performance of the central and lug portions 1 and 2 was 0.141 and that of the neck portions 3 was about 0.280.
~2Z~3320 This cylindrical conveyor belt was loaded to a conventional cylindrical conveyor device and thereby transformed into a cylindrical shape as shown in Fugue.
In the cylindrical conveyor belt of this first embodiment, the conveyor portion composed of the central portion 1 and the neck portions 3 is transformed into a Sue generally circular shape by I cylindrical-shape guide rollers 7, and the lug portions 2 are joined and contacted with each other by a pair of gripping rollers 8 and end face positions thereof are restricted by an end face restricting roller 9.
In the cylindrical conveyor belt of this first embodiment, as shown in Fugue, deforming stresses of the central portion 1 and lug portions 2 are absorbed by the neck portions 3 where the side reinforcing layers are not present, thereby eliminating the inconvenience of floating of the lug portions 3. Further, a compressive force tends to act on the neck portions 3, and it was confirmed unnecessary to consider damage, etc. induced by tensile stress at the neck portions 3.
EXP~IPLE 2 Fugue is a sectional view of principal portions of a cylindrical conveyor belt according to a second embodiment of the present invention.
In the cylindrical conveyor belt of this embodiment, as compared with that of the first embodiment, lug portions 11 have a modified structure.
More specifically, in the lug portions 11 are not formed side reinforcing layers, and instead there were formed surface layers 10 containing an abrasion-resistant member which is a rubber composition comprising a 6:4 blend of butadiene rubber and natural rubber. The construction of the central portion 1 and neck portions 3 is just the same as in the cylindrical conveyor belt of the first embodiment. The trough performance of the central portion 1 and that of the neck portions 3 in this embodiment are the same as in the first embodiment, namely, 0.141 and 0.280, respectively, and the trough performance of the lug portions 11 is 0.210.
In the cylindrical conveyor belt ox this embodiment, since the surfaces of the lug portions 11 are formed by the surface layers 10 which contains the abrasion-resistant member, the wear at the lug portions 11 is diminished and the durability of the same portions is improved.
Fugue is a sectional view of principal portions of a cylindrical conveyor belt according to a third embodiment of the present invention. In this cylindrical conveyor belt, as compared with that of the first embodiment, neck portions 12 have a modified structure. More specifically, a longitudinally extending , . . .
~2Z8320 groove 13 of a semi-circular section is formed in the outer surface of each neck portion 12. The grooves 13 facilitate bending of the neck portions 12 when the belt is transformed into a cylindrical shape as shown in Fugue. In both outer and inner surfaces of each neck portion 14 there may be formed longitudinally extending grooves 15 and 16 as shown in Fugue.
Phase is a sectional view of a cylindrical conveyor belt according to a fourth embodiment of the present invention. This belt has a length of 30 m, a total width of 110 cm, and a uniform thickness of 14 mm.
The cylindrical conveyor belt of this embodiment comprises, in its transverse structure, a bottom portion 17, side portions 18 which constitute both sides of the bottom portion, slant portions 19, neck portions 20 and lug portions 21, which are arranged successively outwards from the central part. The length in the transverse direction of the bottom portion 17 is 275 mm, that of each of the two side portions 18 is 165 .t1.5 mm, that of each of the two slant portions 19 is 1~7 mm, that of each of the two neck portions 20 is 30 mm and that of each of the two lug portions 21 is 70 mm.
As reinforcing layers there were used two kinds of cloths, one being a tension-resistant cloth indicated by thick solid lines and the other being a ~LZ283~
high elongation cloth indicated by dotted lines. The tension-resistant cloth comprises polyester warp and nylon weft and exhibits 1.5 to 2 % elongation under 40 kg load. The high elongation cloth comprises high elongation nylon warp and ordinary nylon weft and exhibits about 20 elongation under a load of about 10 kg/cm.
In the sectional view of Fugue, the upper surfaces serves as an object conveying surface, and the lower surface becomes an outside surface when the conveyor belt is transformed into a cylindrical shape.
In the central portion 17 of the conveyor belt are embedded a tension-resistant cloth 22 having a width of 220 mm centrally in the thickness direction, a tension-resistant cloth 23 overlying the cloth 22 and having a width of 330 mm, and a high elongation cloth 24 underlying the cloth 22 and having a width of 900 mm. In each side portion 18 are embedded a high elongation cloth 25 portioned centrally in the thickness direction adjacent the tension-resistant cloth 22 in the central portion 17 and having a width of 220 mm, a high elongation cloth 26 overlying the cloth 25 and having a width of 110 mm, and the aforementioned high elongation cloth 24 underlying the cloth 25. In each slant portion 19 are embedded a tension-resistant cloth 27 having a width of 220 mm centrally in the thickness direction, a tension-resistant cloth 28 overlying the cloth 27 and , . .
~Z2~33~) having a width of 275 mm, a tension-resistant cloth 29 overlying the cloth 28 and having a width of 150 mm, and the aforementioned high elongation cloth 24 underlying the cloth 27. In each neck portion 20 are embedded only the tension-resistant cloth 27 positioned centrally and the tension-resistant cloth 28 overlying the cloth 27.
In each lug portion 21 are embedded the aforementioned tension-resistant cloths 27 and 28 as well as a tension-resistant cloth 30 overlying them and a tension-resistant cloth 31 underlying them. In this conveyor belt, the thickness of the upper surface-side cover rubber of the central and side portions 17 and 18 is 6 mm and that of the slant and lug portions 19 and 21 is 4 mm, while the cover rubber thickness on the lower surface side is 4 mm except the neck portions 20. The cover rubber hardness is about Ho 56.
The trough performances of the bottom, side, slant, neck and lug portions 17, 18, 19, 20 and 21 were 0.220, 0.270, 0.160, 0.282 and 0.143, respectively.
This cylindrical conveyor belt was also fabricated in the same way as in the manufacture ox the cylindrical conveyor belt of the first embodiment.
It was loaded to a conveyor device and thereby transformed into a cylindrical shape, as shown in Fugue.
The conveyor portion is transformed into a generally round shape by five cylindrical-shape guide ~Z283Zo rollers 7, the lug portions 21 are joined and contacted with each other by a pair of gripping rollers 8, and end face positions of the lug portions 21 are restricted by the end-face roller 9.
The cylindrical conveyor belt of this embodiment was transformed into a substantially round shape by the five cylindrical-shape guide rollers, and it could be maintained in a shape relatively close to a true round even at curved travel portions of the conveyor device.
Fugue is a sectional view of a cylindrical conveyor belt according to a fifth embodiment of the present invention. This belt has a length of 50 m, a total width of 138 cm and a uniform thickness of about 15 mm.
The cylindrical conveyor belt of this embodiment comprises, in its transverse structure, a bottom portion 32, side portions 33 which constitute both sides of the bottom portion, slant portions 34, neck portions 35 and lug portions 36, which are arranged successively outwards from the central part. The length in the transverse direction of the bottom portion 32 is 350 mm, that of each of the two side portions 33 is 250 mm, that of each of the two slant portions 34 is 175 mm, that of each ox the two neck portions 35 is 30 mm and Sue that of each of the two lug portions 36 is 60 mm.
As reinforcing layers there were used two kinds of cloths, one being a tension-resistant cloth indicated by thick solid lines and the other being a high elongation cloth indicated by dotted lines. Both cloths are the same as those used in Example 4.
In the sectional view of Fugue, the upper surface serves as an object conveying surface, and the lower surface becomes an outside surface when the conveyor belt is transformed into a cylindrical shape.
In the central portion 32 of the conveyor belt are embedded, successively from above to below in the thickness direction, a tension-resistant cloth 37 having a width of 450 mm, a tension-resistant cloth 38 having a width of 350 mm, a tension-resistant cloth 39 having a idth of 250 mm and a high elongation cloth 40 having a O
width of mm. In each side portion 33 are embedded a high elongation cloth 41 having a width of 150 mm, a high elongation cloth 42 having a width of 250 mm and a high elongation cloth 43 having a width of 350 mm which are positioned sideways adjacent the tension-resistant cloths 37, 38 and 39, respectively in the central portion 32, as well as the aforementioned high elongation cloth 40 below those high elongation cloths.
In each slant portion 34 are embedded a tension-resistant cloth 44 having a width of 225 my a tension-resistant cloth 45 having a width of to mm and a Swiss ~15 tension-resistant cloth 46 having a width of ~20 mm which are positioned sideways adjacent the high elongation cloths 41, 42 and 43 respectively in the side portion 33, as well as the aforementioned high elongation cloth below those tension-resistant cloths. In each neck portion 35 are embedded only the above tension-resistant cloths 45 and 46. In each lug portion 36 are embedded the aforementioned tension-resistant cloths 45 and 46 as well as a tension-resistant cloth 47 overlying them and a tension-resistant cloth 48 underlying them. In this conveyor belt, the thickness of the upper surface-side cover rubber is about S mm and that of the lower surface-side cover rubber is about 2 mm. The cover rubber hardness is about Ho 63.
The trough performances of the bottom, side slant, neck and lug portions 32, 33, 34, 35 and 36 were 0.157, 0.195,~0.280 and 0.141, respectively.
This cylindrical conveyor belt was also fabricated in the same manner as in the manufacture of the cylindrical conveyor belt of the first embodiment.
It was loaded to a conveyor device 382 mm in diameter of a cylindrical shape like Fugue.
The cylindrical conveyor belt of this embodiment was transformed into a nearly true round by five cylindrical-shape guide rollers, and it could be maintained in a shape relatively close to a true round ~ZZ83ZO
even at curved travel portions of the conveyor device.
Claims (9)
1. A cylindrical conveyor belt which is endless and which comprises in transverse section a central conveyor portion and a pair of lug portions formed integrally at both side ends of said conveyor portion, said paired lug portions being joined and contacted with each other to render said conveyor portion cylindrical, said conveyor portion comprising in transverse section a most centrally positioned bottom portion which constitutes a bottom of the cylindrical shape, a pair of side portions positioned on both sides of the bottom portion and constituting side walls of the cylindrical shape, a pair of slant portions positioned outside said paired side portions and constituting slant upper walls of the cylindrical shape, and neck portions positioned between said paired slant portions and said lug portions and constituting an opening in the cylindrical shape, the rigidity of said neck portions in the transverse direction being smaller than that of said bottom, side, slant and lug portions in the transverse direction.
2. A cylindrical conveyor belt according to claim 1, wherein the rigidities of said bottom portion, said side portions and said slant portions in the transverse direction are the same.
3. A cylindrical conveyor belt according to claim 1, wherein the trough performance of said neck portion in the transverse direction is in the range of 150 to 400, the trough performance of said slant portion in the transverse direction is in the range of 50 to 110 and the trough performance of said side portion in the transverse direction is in the range of 120 to 200 in the case where the trough performance of said bottom portion in the traverse direction is assumed to be 100.
4. A cylindrical conveyor belt according to claim 1, wherein the rigidity of said side portions in the transverse direction is smaller than that of said bottom and slant portions in the transverse direction.
5. A cylindrical conveyor belt according to claim 4, wherein the rigidity of said bottom portion in the transverse direction is smaller than that of said slant portions in the transverse direction.
6. A cylindrical conveyor belt according to claim 1, including at least one central reinforcing layer which communicates said lug portions in the transverse direction.
7. A cylindrical conveyor belt according to claim 4, wherein upper and lower portions of each said lug portion are formed of an abrasion-resistant material.
8. A cylindrical conveyor belt according to claim 1, wherein a longitudinally extending groove is formed in at least one face of each said neck portion.
9. A cylindrical conveyor belt which is endless and which comprises in transverse section a central conveyor portion and a pair of lug portions formed integrally at both side ends of said conveyor portion, said paired lug portions being joined and contact ted with each other by a pair of gripping rollers, and faces of said joined lug portions being restricted by an end-face restrict tying roller, said conveyor portion being transformed into a gener-ally cylindrical shape and pushed upward by a group of guide rollers to press said end faces of said lug portions formed at both side ends of said conveyor portion against said end-face restricting roller, said conveyor portion comprising in transverse section a most centrally positioned bottom portion which constitutes a bottom of the cylindrical shape, a pair of side portions positioned on both sides of the bottom portion and constituting side walls of the cylindrical shape, a pair of slant portions positioned outside said paired side portions and constituting slant upper walls of the cylindrical shape, and neck portions positioned between said paired slant portions and said lug portions and constituting an opening in the cylindrical shape, the rigidity of said neck portions in the transverse direction being smaller than that of said bottom side, slant and lug portions in the transverse direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58248580A JPS60144211A (en) | 1983-12-29 | 1983-12-29 | Cylindrical conveyor belt |
| JP248580/1983 | 1983-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1228320A true CA1228320A (en) | 1987-10-20 |
Family
ID=17180237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000471119A Expired CA1228320A (en) | 1983-12-29 | 1984-12-28 | Cylindrical conveyor belt |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS60144211A (en) |
| KR (1) | KR950003263B1 (en) |
| AU (1) | AU564136B2 (en) |
| CA (1) | CA1228320A (en) |
| DE (1) | DE3447248C2 (en) |
| FR (1) | FR2557546B1 (en) |
| GB (1) | GB2152000B (en) |
| ZA (1) | ZA849760B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2830978A1 (en) * | 2012-03-30 | 2015-02-04 | P. Ellegaard A/S | Flexible closed belt conveyor |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU583552B2 (en) * | 1984-11-12 | 1989-05-04 | Technosearch Pty. Limited | A conveying means |
| AU573309B2 (en) * | 1985-02-27 | 1988-06-02 | Sumitomo Heavy Industries Ltd. | Tubular belt conveyor |
| GB2195309A (en) * | 1986-09-30 | 1988-04-07 | Okazaki Haruo | A belt for a tubular belt conveyor |
| JPS63119515U (en) * | 1987-01-27 | 1988-08-02 | ||
| AU579506B2 (en) * | 1987-03-20 | 1988-11-24 | Bridgestone Corporation | Method of conveying materials and tubular belt conveyor therefor |
| US5060787A (en) * | 1987-12-18 | 1991-10-29 | Lennart Tingskog | Belt conveyor and conveyor belt therefor |
| EP0336385B1 (en) * | 1988-04-07 | 1993-03-31 | Phoenix Aktiengesellschaft | Tubular conveyor belt |
| SE461212B (en) * | 1988-06-23 | 1990-01-22 | Scaniainventor Conveyor Sicon | BRANDTRANSPORTOER |
| DE4024359A1 (en) * | 1990-08-01 | 1992-02-06 | Continental Ag | CONVEYOR BELT FOR HOSE TAPE CONVEYORS |
| DE4121572C1 (en) * | 1991-06-29 | 1992-12-03 | Fa. Ernst Siegling, 3000 Hannover, De | |
| JP2517840B2 (en) * | 1994-01-24 | 1996-07-24 | 三ツ星ベルト株式会社 | Flexible conveyor belt |
| FR2761352B1 (en) * | 1997-03-25 | 1999-05-28 | Sfbt Societe Francaise De Band | FLEXIBLE CONVEYOR BELT AND CONVEYOR USING THE SAME |
| KR101535364B1 (en) * | 2006-06-13 | 2015-07-08 | 지-필터 피티와이 리미티드 | Materials handling and treatment |
| US9381454B2 (en) | 2009-05-19 | 2016-07-05 | Z-Filter (Pty) Ltd | Materials handling and treatment |
| KR20150066544A (en) * | 2012-10-10 | 2015-06-16 | 지-필터 피티와이 리미티드 | Separation apparatus and method |
| JP6762085B2 (en) * | 2015-07-31 | 2020-09-30 | 横浜ゴム株式会社 | Conveyor belt |
| CN107344665B (en) * | 2017-06-29 | 2019-12-31 | 宁德师范学院 | Control method of material conveyor pipe belt deviation adjusting device |
| CN107235307B (en) * | 2017-06-29 | 2020-02-04 | 宁德师范学院 | Control method of automatic deviation adjusting device for circular pipe part of pipe belt conveyor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1375744A (en) * | 1963-06-06 | 1964-10-23 | Erbo Maschb Erley & Bonninger | Belt conveyor |
| US3661244A (en) * | 1968-06-28 | 1972-05-09 | Masaaki Koyama | Automatic circular winding and releasing belt conveyor |
| DE2001910A1 (en) * | 1970-01-16 | 1971-07-22 | Koyama Masaaki | Cylindrical belt conveyor |
| FR2077707B1 (en) * | 1970-02-06 | 1974-06-14 | Koyama Masaaki | |
| JPS4720556U (en) * | 1971-02-22 | 1972-11-08 | ||
| JPS5511858Y2 (en) * | 1974-09-19 | 1980-03-14 | ||
| JPS5772506A (en) * | 1980-10-23 | 1982-05-06 | Bridgestone Corp | Conveyer belt |
-
1983
- 1983-12-29 JP JP58248580A patent/JPS60144211A/en active Granted
-
1984
- 1984-12-14 ZA ZA849760A patent/ZA849760B/en unknown
- 1984-12-18 GB GB08431907A patent/GB2152000B/en not_active Expired
- 1984-12-20 KR KR1019840008178A patent/KR950003263B1/en not_active IP Right Cessation
- 1984-12-22 DE DE3447248A patent/DE3447248C2/en not_active Expired - Fee Related
- 1984-12-24 AU AU37182/84A patent/AU564136B2/en not_active Ceased
- 1984-12-28 FR FR8420035A patent/FR2557546B1/en not_active Expired
- 1984-12-28 CA CA000471119A patent/CA1228320A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2830978A1 (en) * | 2012-03-30 | 2015-02-04 | P. Ellegaard A/S | Flexible closed belt conveyor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3447248C2 (en) | 1993-12-16 |
| ZA849760B (en) | 1985-08-28 |
| GB8431907D0 (en) | 1985-01-30 |
| JPS60144211A (en) | 1985-07-30 |
| KR950003263B1 (en) | 1995-04-07 |
| GB2152000A (en) | 1985-07-31 |
| GB2152000B (en) | 1987-01-14 |
| AU564136B2 (en) | 1987-07-30 |
| KR850004435A (en) | 1985-07-15 |
| AU3718284A (en) | 1985-07-04 |
| JPS638008B2 (en) | 1988-02-19 |
| FR2557546A1 (en) | 1985-07-05 |
| FR2557546B1 (en) | 1987-12-18 |
| DE3447248A1 (en) | 1985-07-11 |
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| Publication | Publication Date | Title |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |