JP2015124025A - Conveyance belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyance belt excellent in durability by preventing breaking of sewing threads due to repeated bending.SOLUTION: A conveyance belt 1 comprises: an endless belt body 20 for loading a conveyance object on a surface 21 to be a conveyance surface; and a guide body 30 sewn by sewing threads 31, 32 in a longitudinal direction so as to constitute two or more lines of seams in a width direction of a rear surface 22 of the belt body 20. The conveyance belt 1 is wound around a pulley 10 and rotated so that the guide body 30 engages into a groove 11 formed in a circumferential direction of the pulley 10. The seams 31, 32 are constituted by intertwining sewing threads 31a, 32b to be needle threads located on a pulley side of the conveyance belt 1 with sewing threads 31b, 32b to be bobbin threads located on a conveyance surface side of the conveyance belt 1 at fixed intervals in the longitudinal direction of the belt body 20. Then, the seams 31, 32 are sewn so that positions P, Q where the needle threads are intertwined with the bobbin threads in a thickness direction of the guide body 30.

Description

  The present invention relates to an endless conveyance belt that is wound around a pulley and rotated.

  When conveying industrial products such as food and electronic parts, an endless conveyor belt that is wound around a pulley and rotated is used. In such a conveyor belt, it is necessary to position the conveyed object with high accuracy, and it is required that the conveyor belt does not meander. Therefore, conventionally, a string-like protrusion is sewed in the longitudinal direction of the conveyor belt, and on the other hand, a groove for engaging the protrusion is provided in the pulley around which the conveyor belt is wound. A technique for preventing meandering of the conveyor belt is disclosed because the protrusions sewn on the belt engage with the groove of the pulley and rotate.

  Moreover, in the conveyance process of the said conveyed product, not only a conveyed product is moved but heating processes, such as baking and drying, are often performed in the middle. In this case, a conveyor belt is installed inside a baking furnace, a drying furnace, etc., and the conveyor belt itself is required to have a heat resistance of about 100 to 250 ° C.

Therefore, for example, Patent Document 1 discloses that a heat-resistant base material sheet (made of glass fiber or aramid fiber) is impregnated with a fluororesin and fired on the back side of the belt body on the pulley side. A string (guide body) made of braided fiber (impregnated with fluororesin in base fiber (glass fiber or aramid fiber) and fired by impregnating fluororesin with glass (glass fiber or aramid fiber) A stitched conveyor belt is disclosed. In the conveyor belt shown in Patent Document 1, meandering of the belt can be prevented by fitting the guide body into a groove formed on the pulley surface.
However, in Patent Document 1, the guide body is caused by a force caused by a difference in curvature between the conveyance surface side of the conveyance belt and the pulley side, which is generated when the conveyance belt is wound around a roller (pulley) and repeatedly bent. May be damaged or the sewn string may be broken.

Further, for example, in Patent Document 2, a belt-shaped guide having a round or polygonal cross-sectional shape in which a base fiber excellent in heat resistance such as glass fiber and aramid fiber is braided with a yarn baked by impregnating a fluororesin. A conveyor belt with sewn bodies is disclosed. The guide body is composed of a core body and an outer skin, and the braid angle of the string is set to be smaller in the outer skin than the core body, so that it exhibits excellent deformability and is used when the transport belt is wound around a roller. It is described that it is possible to absorb the force due to the difference in curvature between the conveying surface side of the conveying belt and the pulley side, which is caused by repeated bending, and thus the damage to the guide body can be prevented. Patent Document 2 describes a method of attaching a guide body to a conveyor belt by sewing with a yarn obtained by impregnating a base material fiber excellent in heat resistance like heat fusion or a guide body with a fluororesin.
However, in Patent Document 2, in the case of heat fusion, the bonding force is not sufficient, and there is a concern that the gaite body may come off. In addition, in the case of sewing, the thread used to sew the guide body is small in elongation, so if the normal sewing machine is sewn, the belt will cut when the entire belt repeatedly expands and contracts. There is a problem that it will come off.

Furthermore, for example, Patent Document 3 discloses a conveyance belt in which a string formed by braiding a plurality of thin threads impregnated with a heat-resistant fiber and impregnated with a fluororesin is sewed. Since this guide body is knitted with a plurality of thin threads, when the belt expands and contracts, the local force due to the difference in curvature between the transport surface side of the transport belt and the pulley side can be made uniform. Is also described as having excellent durability.
However, in Patent Document 3, even if the force generated by the belt expansion and contraction can be relieved by the structure of the guide body and the guide body can be prevented from being damaged, the guide body is fixed to the belt by sewing. There is a risk that the force will be applied. If the sewn part is damaged, the guide body is detached from the belt, and therefore meandering cannot be prevented. In addition, in Patent Document 3, as a sewing method of the guide body, a structure in which two threads of an upper thread and a lower thread are sewn is shown in FIG. 10, but in FIG. The upper thread arranged on the side surface (upper surface shown in FIG. 10) passes through the conveyor belt and the guide body, and reaches the pulley side surface (lower surface shown in FIG. 10) of the conveyor belt. Although it is sewn so as to be intertwined with the arranged lower thread, no particular mention is made of the sewing method.

Japanese Utility Model Laid-Open No. 1-143710 JP-A-8-239109 Japanese Utility Model Publication No. 6-17771

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to provide a transport belt excellent in durability by preventing breakage of a sewing thread due to repeated bending.

  In order to solve the above problems, the conveyance belt according to the present invention has an endless belt body on which a conveyed product is placed on a surface serving as a conveyance surface and the back surface is wound around a pulley, and a back surface of the belt body. One or more guide bodies sewn with a sewing thread along the longitudinal direction of the belt main body so as to form two or more rows of stitches in the width direction of the belt main body, and in the circumferential direction of the pulley It is characterized by being wound around a pulley and rotated so that the guide body fits into the formed groove.

  According to the transport belt of the present invention, the guide body is sewn to the belt main body so that the seams are in two or more rows, so that the force generated by the bending of the transport belt is dispersed in the two or more rows of seams, and each seam is sewn. The load on the constituent sewing thread is distributed. As a result, it is possible to prevent the sewing thread from being broken due to repeated bending of the conveyor belt and to provide a conveyor belt having excellent durability.

In the conveyor belt, the seam is a sewing thread that becomes an upper thread positioned on the pulley side of the conveyor belt and a lower thread positioned on the conveyor surface side of the conveyor belt at regular intervals in the longitudinal direction of the belt body. The sewing thread may be alternately entangled, and the position where the upper thread and the lower thread are entangled in the thickness direction of the guide body may be different in the two or more rows of stitches.
Since the position where the upper thread and the lower thread are intertwined is different at two or more rows of stitches, the load on the sewing thread due to the force generated by the difference in curvature between the conveying surface side of the conveying belt and the pulley side is alleviated when the conveying belt is bent. At the same time, the sewing thread is less likely to be cut by extending the upper thread and the lower thread, and the sewing thread can be prevented from being broken due to repeated bending of the conveyor belt.

In the conveyor belt, the seam is in two rows, and the position where the upper thread and the lower thread are intertwined in the thickness direction of the guide body is the center of the guide body or the center of the guide body in one row of seams. It may be located closer to the conveying surface side of the conveying belt, and at the stitches in the other row, it may be located closer to the pulley side of the conveying belt than the center of the guide body.
The position where the upper thread and lower thread are intertwined is the center in the thickness direction of the guide body or the transport surface side from the center in the thickness direction of the guide body, and the pulley side from the center in the thickness direction of the guide body at the seam of the other row. Since the two rows of stitches are different, the load on the sewing thread due to the force generated by the difference in curvature between the conveying surface side of the conveying belt and the pulley side when the conveying belt is bent is reduced, and the upper thread When the lower thread is extended, the sewing thread is hardly cut, and the sewing thread can be prevented from being broken due to repeated bending of the conveyor belt.

In the conveyor belt, a reinforcing member may be disposed at an end portion in the width direction of the belt main body, and the guide body may be sewn to the belt main body via the reinforcing member.
The guide body can be sewn via the reinforcing member even on the belt main body having a large gap between the heat resistant fibers, which is difficult to sew directly on the guide body. Here, the gap between the heat resistant fibers means the interval between the weaves of the belt body made of woven fabric.

In the transport belt, the belt main body may be formed by impregnating a heat resistant fiber with a heat resistant resin and baking. The guide body may be formed of braided braided yarn obtained by impregnating a heat-resistant fiber with a heat-resistant resin and fired, or a rod-shaped body made of a heat-resistant resin. Further, the sewing thread may be formed by impregnating a heat resistant fiber with a heat resistant resin and baking.
Since the belt main body is formed by impregnating a heat-resistant fiber with a heat-resistant resin and firing, the belt main body can correspond to a conveyance belt that requires heat resistance. Further, since the guide body is formed of braided braided yarn obtained by impregnating a heat-resistant fiber with a heat-resistant resin and fired, or a rod-shaped body made of a heat-resistant resin, heat resistance is required. It can correspond to a conveyor belt. In addition, even if the sewing thread is formed of heat-resistant fibers such as glass fiber or aramid fiber having low stretchability, as described above, the load on the sewing thread due to the force generated by the bending of the conveyor belt is dispersed. The breakage of the sewing thread can be prevented.

  As described in the above description, according to the present invention, it is possible to provide a transport belt excellent in durability by preventing the sewing thread from being broken by repeated bending.

It is a perspective view which shows the state by which the conveyance belt which concerns on this embodiment was wound around the pulley. It is sectional drawing of the width direction of the belt main body of FIG. 1 which shows the state by which the conveyance belt which concerns on this embodiment was wound around the pulley. It is sectional drawing of the longitudinal direction of the belt main body cut | disconnected by the part of the guide body of FIG. 1 which shows the state by which the conveyance belt which concerns on this embodiment was wound around the pulley. It is sectional drawing of the width direction of the belt main body of the conveyance belt which concerns on this embodiment. The longitudinal cross-sectional view of the belt main body at the first row of seams shown in FIG. 4C and the longitudinal cross-sectional view of the belt main body at the second row of seams shown in FIG. 4D of the transport belt according to this embodiment are overlapped. It is a figure shown collectively. It is sectional drawing of the longitudinal direction of the belt main body in the 1st row | line | column seam of the conveyance belt which concerns on this embodiment. It is sectional drawing of the longitudinal direction of the belt main body in the stitch of the 2nd row of the conveyance belt which concerns on this embodiment. It is sectional drawing of the width direction of the belt main body which shows the conveyance belt which concerns on other embodiment. It is sectional drawing of the width direction of the belt main body which shows the conveyance belt which concerns on a present Example. It is a figure which shows the layout used in the running test of the conveyance belt which concerns on a present Example. It is sectional drawing of the width direction of the belt main body which shows the conventional conveyance belt. It is sectional drawing of the longitudinal direction of the belt main body which shows the conventional conveyance belt.

  Embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the conveyance belt 1 according to this embodiment includes an endless belt body 20 and a guide body attached to the back surface 22 of the belt body 20 along the longitudinal direction (X direction) of the belt body 20. 30. In the transport belt 1 according to the present embodiment, the back surface 22 of the belt main body 20 is wound around two or more pulleys 10 in a state where an appropriate tension is applied, and becomes a transport surface of the belt main body 20. The conveyed product 3 is placed on the surface 21 and conveyed. In FIG. 1, the longitudinal direction of the belt main body 20 is illustrated as the X direction, and the width direction of the belt main body 20 is illustrated as the Y direction.

  The belt body 20 is a long band-shaped member formed in an endless shape. The belt body 20 may be formed endlessly by joining both ends of a long belt-like member having ends on both sides in the longitudinal direction of the belt body 20. As a joining method, there are a joining method using overlap, butting, an interoven, a metal fitting, and a pin. The joining method by overlap is a method in which a part of both ends is overlapped and joined by heat fusion or an adhesive film. The joining method by butt | matching is a method which butts both ends and joins a butt | matching part by heat sealing | fusion or an adhesive film. In addition, a joining part may be reinforced by sticking a reinforcement member (a fluororesin film, a fluororesin belt (planar type belt)) on the back face of the butting part. The joining method using an interoven is a method in which part of the surface fluororesin layer at both ends is peeled off, the core canvas is exposed, the weft is pulled out, and the layers are joined together by heat welding or an adhesive film. The joining method using the metal fittings is a method in which a plurality of tip-shaped metal fittings attached to both ends of the belt are alternately butted and stainless steel pins are joined to the ring portions. The joining method using a pin is a method in which both ends of a belt are cut into fingers, the ends that are folded back to make a tip ring shape are alternately abutted, and a fluororesin pin is joined to the ring portion.

  The belt body 20 is composed of a woven fabric core canvas with a heat-resistant fiber as a base material. Examples of the heat resistant fiber include aramid fiber, glass fiber, carbon fiber, ceramic fiber, PBO fiber, and fluorine fiber. Of these, aramid fibers and glass fibers excellent in heat resistance are preferable. The core canvas constituting the belt main body 20 is impregnated with a heat resistant resin and fired. Examples of the heat resistant resin include, for example, fluorine resin, silicone resin, epoxy resin, phenol resin, melanin resin, unsaturated polyester resin, polyimide resin, thermosetting acrylic resin, furan resin, urea resin, diallyl phthalate resin, Blend systems or copolymers may be mentioned. Among these, a fluororesin having good heat resistance, low compression set, and the like is preferable. Moreover, when it is desired to prevent slipping of the conveyed product conveyed by the conveying belt 1, a silicone resin having a high friction coefficient is preferable. Here, examples of the fluororesin include PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), and PCTFE (polychlorotrifluoroethylene). From the viewpoint of heat resistance, PTFE is particularly preferred. For the impregnation treatment, a dispersion in which fluororesin fine particles are dispersed in water may be used.

There are two types of belt body 20, a mesh belt and a planar belt.
The mesh belt has a large gap (that is, the interval between the weaves) of the heat-resistant fibers constituting the woven cloth that becomes the core canvas, and there is a gap even after the impregnation and firing treatment of the heat-resistant resin. A heat-resistant resin film is present around the heat-resistant fibers to be formed. In the case of a mesh-type belt, for example, a woven fabric in which an aramid fiber or glass fiber having a fineness (total fineness of twisted yarn) of 440 to 1670 dtex is woven in a plain weave or entangled weave so as to have a thickness of 0.45 to 0.98 mm Is the core canvas.
In addition, the flat belt has a small gap between heat resistant fibers constituting the woven fabric as the core canvas (that is, the interval between the weaves), and the gap between the heat resistant fibers constituting the woven cloth after the impregnation treatment with the heat resistant resin. And the entire conveyance surface is covered with a heat resistant resin. In the case of a flat type belt, for example, an aramid fiber or glass fiber having a fineness (total fineness of twisted yarn) of 440 to 1670 dtex and a woven fabric woven by plain weave or twill weave so as to have a thickness of 0.25 to 1.06 mm is used. Use core canvas.

  When the belt main body 20 is a mesh type belt, as shown in FIG. 5 described later, covers that cover the belt end portions on both side edges in the width direction of the belt main body 20, that is, both end portions in the width direction of the belt main body 20 ( (Reinforcing member) 40 is disposed. The cover 40 is formed by cutting a core canvas made of the same material as the belt main body 20 into a predetermined size, overlapping an adhesive film 41 having substantially the same size as the cover 40, and folding the cover 40 at the belt end of the belt main body 20. The cover is covered and bonded to the belt main body 20 via the adhesive film 41 by heat fusion. For example, the cover 40 preferably has a thickness of 0.075 to 0.35 mm (standard is 0.15 mm) and a width covering the belt end of 10 to 50 mm (standard is 25 mm). The adhesive film 41 is preferably a fluororesin film such as PFA or PTFE from the viewpoint of heat resistance. The adhesive film 41 preferably has a thickness of 0.05 to 0.1 mm and a width of 10 to 50 mm (standard is 25 mm), which is the same size as the cover 40. In addition, even when the belt main body 20 is a flat belt, covers that cover the belt end portions may be disposed at both ends of the belt main body 20 in the width direction. By disposing the cover 40, the belt body 20 is cut to a predetermined width, and even if cut surfaces are formed on both side edges in the width direction of the belt body 20, The fraying phenomenon can be prevented by eliminating exposure and preventing fraying even if both side edges of the belt come into contact with the frame or the like.

  The guide body 30 is a fiber that is obtained by impregnating a heat-resistant fiber such as an aramid fiber or glass fiber with a heat-resistant resin such as a fluororesin and firing it, or a long rod-like material based on a heat-resistant resin such as a fluororesin. It is a member. For example, the guide body 30 is a round or polygonal (for example, quadrangular) cross section in which a plurality of fibers baked by impregnating a heat resistant fiber such as a fluororesin into a heat resistant fiber such as an aramid fiber or a glass fiber. A braid having a shape. When a braid having a square cross-sectional shape is used as the guide body 30, a braid having a diameter of 3 to 5 mm is used, for example. The same fluororesin as that of the belt body 20 can be used. The heat-resistant fiber constituting the braid may be a fiber not impregnated / fired with a fluororesin or not coated with fluorine. The guide body 30 is not limited to a braid, and may be formed of a bar-shaped bar made of PTFE resin.

  One or more guide bodies 30 are attached to the back surface 22 of the belt body 20 along the longitudinal direction of the belt body 20. In the conveyance belt 1 according to the present embodiment, the two guide bodies 30 are fitted into the two guide grooves 11 formed in the circumferential direction of the pulley 10 on both the left and right sides in the width direction (Y direction) of the belt body 20. It can be attached to the matching position. The number of guide bodies 30 and the positions to be attached are determined according to the width of the belt body 20 and the shape of the pulley 10 to be wound. For example, one guide body 30 may be attached to the approximate center in the width direction of the belt body 20.

  The guide body 30 may be attached before the belt body 20 is formed into an endless shape by joining, and the belt body 20 with the guide body 30 attached may be formed into an endless shape by joining. Alternatively, the guide body 30 may be attached after the belt body 20 is formed in an endless shape by joining.

  As shown in FIGS. 2 and 3, the two guide bodies 30 are fitted into the guide grooves 11 provided in the pulley 10, thereby preventing the meandering of the transport belt 1 wound around the pulley 10. Here, as shown in FIG. 3, when the conveyor belt 1 is wound around the pulley 10 and used, the conveyor belt 1 is bent along the pulley 10. Force is generated due to the difference in curvature on the side. That is, as indicated by the arrows in FIG. 3, a tensile force is generated on the conveying surface side of the conveying belt 1, and a compressive force is generated on the pulley side of the conveying belt 1.

  Next, attachment of the guide body 30 to the belt body 20 will be described in detail based on FIGS. 4A to 4D. 4A is a cross-sectional view in the width direction of the belt main body 20 including the guide body 30 of the conveyance belt 1 according to the present embodiment, and corresponds to an enlarged view of a portion Z in FIG.

  As shown in FIG. 4A, the guide body 30 placed on the back surface 22 of the belt body 20 along the longitudinal direction of the belt body 20 is sewn in a width direction of the belt body 20 by using a sewing thread, which will be described later. The belt body 20 is sewn so as to form two rows of stitches 31 and 32. The seams are not limited to two rows in the width direction of the belt main body 20, and may be composed of three or more rows. Thereby, the breakage of the sewing thread due to repeated bending of the conveyor belt 1 can be prevented, and the conveyor belt 1 having excellent durability can be provided.

  As the sewing thread, a fiber obtained by impregnating a heat resistant fiber such as an aramid fiber or glass fiber with a heat resistant resin such as a fluororesin and firing it is used. For example, an aramid fiber having a fineness (total fineness of twisted yarn) of 1670 to 2222 dtex is used as the sewing thread. The same fluororesin as that of the belt body 20 can be used. The heat-resistant fiber constituting the sewing thread may be a fiber not impregnated / fired with a fluororesin or not coated with fluorine.

  Further, as shown in FIGS. 4A and 4B, the seam 31 includes upper threads positioned on the pulley side of the conveyor belt 1 (upper side in FIG. 4A and FIG. 4B) at regular intervals in the longitudinal direction of the belt body 20. The sewing thread 31a and the sewing thread 31b, which is the lower thread located on the conveyance surface side of the conveyance belt 1 (the lower side in FIG. 4A and FIG. 4B), are alternately entangled. Similarly, the seam 32 becomes a sewing thread 32 a serving as an upper thread positioned on the pulley side of the transport belt 1 and a lower thread positioned on the transport surface side of the transport belt 1 at regular intervals in the longitudinal direction of the belt body 20. The sewing thread 32b is alternately entangled.

  Here, as shown in FIG. 4B, in the thickness direction of the guide body 30, a position where the upper thread 31 a and the lower thread 31 b of the first row of stitches 31 are intertwined (“first-line entanglement position” in the figure) P, A position Q (the “second line entanglement position” in the figure) Q of the upper thread 32a and the lower thread 32b of the second line seam 32 is different. As a result, the load on the sewing threads 31a, 31b, 32a, and 32b caused by the difference in curvature between the conveying surface side of the conveying belt 1 and the pulley side when the conveying belt 1 is bent is reduced, and the upper threads 31a and 32a are alleviated. When the lower threads 31b and 32b are stretched, the sewing threads 31a, 31b, 32a and 32b are less likely to be cut, and the sewing threads 31a, 31b, 32a and 32b can be prevented from being broken due to repeated bending of the conveyor belt 1.

  Specifically, as shown in FIG. 4C, the position P (the first row entanglement position in the drawing) P of the upper thread 31 a and the lower thread 31 b of the first row of stitches 31 is from the center of the guide body 30. It is located on the pulley side (upper side in FIG. 4C) of the conveyor belt 1. The first-line entanglement position P is not limited to the position illustrated in FIG. 4C, and may be located anywhere as long as the position is on the pulley side of the conveyance belt 1 from the center of the guide body 30.

  On the other hand, as shown in FIG. 4D, the position Q where the upper thread 32 a and the lower thread 32 b of the second row seam 32 are intertwined (“second line entanglement position” in the figure) Q is located substantially at the center of the guide body 30. ing. Note that the second row entanglement position Q is not limited to the position shown in FIG. 4D, and is anywhere as long as it is the center of the guide body 30 or the position on the transport surface side of the transport belt from the center of the guide body 30 (upper side in FIG. May be located.

  Further, the first row entanglement position P and the second row entanglement position Q may be the same or may be located at any position of the guide body 30. This is because the force generated by the bending of the conveying belt 1 is distributed by the two rows of stitches 31 and 32, and the load on the sewing threads 31a, 31b, 32a and 32b constituting the respective stitches 31 and 32 is dispersed.

  As shown in FIG. 5, when the reinforcing member 40 is disposed at the end in the width direction of the belt main body 20, the guide body 30 constitutes two rows of stitches 31 and 32 in the width direction of the belt main body 20. In this manner, the belt main body 20 is sewn via the reinforcing member 40. The position where the upper thread 31a and the lower thread 31b of the seam 31 are intertwined and the position of the upper thread 32a and the lower thread 32b of the seam 32 are as described above. Accordingly, the guide body 30 can be sewn via the reinforcing member 40 even to the belt main body 20 (mesh type belt) having a large gap between the heat-resistant fibers, which is difficult to sew the guide body 30 directly. .

  When there are three or more rows of stitches, it is preferable that the positions where the upper thread and the lower thread of each stitch are intertwined in the thickness direction of the guide body 30 are different. The load on the sewing thread due to the force generated by the difference in curvature between the conveyance surface side and the pulley side of the conveyance belt 1 when the conveyance belt 1 is bent is alleviated, and the sewing thread is cut by the upper and lower threads being stretched. This is because the sewing thread can be prevented from being broken by repeated bending of the conveyor belt 1.

  As described above, according to the conveyor belt 1 according to the present embodiment, the position where the upper thread 31a and the lower thread 31b of the first row of stitches 31 are intertwined is set to the pulley side from the center in the thickness direction of the guide body 30. The position where the upper thread 32a and the lower thread 32b of the row of stitches 32 are entangled with each other is made different between the two rows of stitches 31 and 32, with the center in the thickness direction of the guide body 30 being different. Thereby, the load on the sewing thread due to the force generated by the difference in curvature between the conveying surface side of the conveying belt 1 and the pulley side when the conveying belt 1 is bent is alleviated, and the breaking of the sewing thread due to repeated bending of the conveying belt 1 is prevented. Can do.

  According to the following procedure, the conveyor belt 1 according to Example 1, Example 2, and Comparative Example as shown in FIG. 6 was formed.

  First, a plain woven fabric made of glass fibers was cut into a predetermined size (width 100 mm × length 1300 mm × thickness 0.68 mm), impregnated with fluororesin and fired to obtain a belt body 20. The belt body 20 according to the present embodiment is a planar type. Next, a braid was formed by braiding a plurality of yarns obtained by impregnating and firing a fluororesin into an aramid fiber twisted yarn. Then, the braid was used as a guide body 30 and was sewn along the longitudinal direction of the belt body 20 at the center of the belt body 20 as shown in FIG. Finally, both ends in the longitudinal direction of the belt main body 20 to which the guide body 30 was sewn were joined to obtain an endless transport belt 1. The reinforcing member 40 was not disposed.

  And as a guide body 30, a plurality of yarns obtained by impregnating and firing a fluororesin into a twisted yarn of an aramid fiber is knitted to form a braid having a predetermined shape (diameter of 5 mm square x length of 1300 mm). The belt body 20 was sewn along the longitudinal direction in the center. As the sewing thread, a thread obtained by impregnating and firing a fluororesin into a twisted thread made of an aramid fiber was used.

  Here, in the conveyance belt 1 according to the first embodiment, as shown in FIGS. 4A to 4D, two rows of seams 31 and 32 are configured in the width direction of the belt main body 20. The position at which the upper thread 31a and the lower thread 31b of the first row of stitches 31 are intertwined is positioned closer to the pulley than the center in the thickness direction of the guide body 30 (more specifically, from the center in the thickness direction of the guide body 30). (If the thickness to the pulley side end is 1, the position is about 1/2 to 2/3 of the thickness from the center toward the pulley side.) The upper thread 32a and the lower thread 32b of the seam 32 in the second row are intertwined. The guide body 30 was sewn to the belt main body 20 so that the position was located at the center of the guide body 30 in the thickness direction.

  Further, in the conveyance belt 1 according to the second embodiment, two rows of stitches 31 and 32 are configured in the width direction of the belt body 20 in the same manner as the conveyance belt 1 according to the first embodiment shown in FIGS. 4A to 4D. did. The position where the upper thread 31a and the lower thread 31b of the first row of stitches 31 are entangled with the position of the upper thread 32a and the lower thread 32b of the second row of stitches 32 are the same position, and the guide body 30 The guide body 30 was sewn to the belt main body 20 so as to be positioned at the center in the thickness direction.

  On the other hand, in the conveyor belt 1 according to the comparative example, as shown in FIGS. 8A to 8B, one row of stitches 35 is formed in the width direction of the belt main body 20. Then, the guide body 30 was sewn to the belt body 20 so that the position where the upper thread 35a and the lower thread 35b of the seam 35 are entangled with each other is located at the center in the thickness direction of the guide body 30.

(Running test)
Then, the conveyor belt 1 according to Example 1, Example 2 and the comparative example is run around the biaxial pulleys 10 and 12 shown in the layout shown in FIG. Time was measured. Here, the pulley diameters of the biaxial pulleys 10 and 12 are each 90φ. Further, the biaxial pulleys 10 and 12 were arranged so that the tension was 3 kgf / cm, and the biaxial pulleys 10 and 12 were driven so that the belt speed was 50 m / min.

  For each of the conveyance belts 1 according to Example 1, Example 2 and Comparative Example, the number of stitches, the entanglement position of the upper thread and the lower thread, and the measurement result of the running time until the occurrence of the cut and elongation of the sewing thread It is shown in 1.

[Discussion]
From the above running test, the following became clear.

  From the results of Table 1, the conveyance belt 1 according to Example 1 can extend the running time to the occurrence of the cutting and breaking of the sewing thread by about 8.8 times as compared with the conveyance belt 1 according to the comparative example. It was confirmed that the sewing thread was excellent in durability by preventing breakage of the sewing thread due to repeated bending. This is because the guide body 30 has the belt main body 20 so that the conveyance belt 1 according to the first embodiment forms two rows of stitches and the positions where the upper thread and the lower thread of the two rows of stitches are entangled with each other. The load on the sewing thread due to the force generated by the difference in curvature between the conveying surface side of the conveying belt 1 and the pulley side when the conveying belt 1 is bent is eased, and the upper thread and the lower thread are stretched. This is considered to be because the cutting of the sewing thread is less likely to occur.

  Further, the conveyor belt 1 according to the second embodiment can extend the running time until the sewing thread is cut and stretched by about 4.9 times as compared with the conveyor belt 1 according to the comparative example. It was confirmed that it was excellent in durability. This is because the guide body 30 is sewn to the belt main body 20 so that the conveyance belt 1 according to the second embodiment constitutes two rows of seams, and the force generated by the bending of the conveyance belt 1 is the two rows of stitches. This is considered to be because the load on the sewing thread constituting each seam is distributed.

  From the above, in order to prevent the thread from being broken due to repeated bending and to provide a transport belt having excellent durability, the guide body 30 is sewn to the belt body 20 so as to form two or more rows of seams. It has become clear that the conveyor belt 1 may be formed. Further, it has become clear that it is better to form the conveyor belt 1 by sewing the guide body 30 to the belt body 20 so that the positions where the upper thread and the lower thread of the two or more stitches are intertwined are different.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment and an Example. The scope of the present invention is shown not only by the above description of the embodiments and examples but also by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  By utilizing the present invention, it is possible to provide a transport belt having excellent durability by preventing breakage of the sewing thread due to repeated bending.

1 Conveying belt 10 Pulley 11 Groove 20 Belt body 21 Front surface 22 Back surface 30 Guide body 31 Seam 31a Sewing thread (upper thread)
31b Sewing thread (lower thread)
32 Seam 32a Sewing thread (upper thread)
32b Sewing thread (lower thread)
40 Reinforcing member

Claims (7)

An endless belt body on which a transported object is placed on the surface to be a transport surface and the back surface is wound around a pulley;
One or more guide bodies sewn with sewing threads along the longitudinal direction of the belt body so as to form two or more rows of stitches in the width direction of the belt body on the back surface of the belt body;
With
A conveying belt, wherein the conveying belt is wound around a pulley and rotated so that the guide body fits into a groove formed in a circumferential direction of the pulley. The seam includes a sewing thread serving as an upper thread positioned on the pulley side of the transport belt and a sewing thread serving as a lower thread positioned on the transport surface side of the transport belt at regular intervals in the longitudinal direction of the belt body. Composed of alternating entanglements,
The conveyance belt according to claim 1, wherein a position where the upper thread and the lower thread are intertwined in the thickness direction of the guide body is different in the two or more rows of stitches. The seams are in two rows;
The position where the upper thread and the lower thread are intertwined in the thickness direction of the guide body,
In one row of stitches, the center of the guide body or the center of the guide body is located on the transport surface side of the transport belt,
The transport belt according to claim 2, wherein the seam in the other row is positioned on the pulley side of the transport belt from the center of the guide body. A reinforcing member is disposed at an end in the width direction of the belt body,
The conveyance belt according to any one of claims 1 to 3, wherein the guide body is sewn to the belt main body via the reinforcing member.   The conveyor belt according to any one of claims 1 to 4, wherein the belt main body is formed by impregnating a heat-resistant fiber with a heat-resistant resin and baking.   6. The guide body according to claim 1, wherein the guide body is formed of braided braided yarn obtained by impregnating a heat-resistant fiber with a heat-resistant resin and fired, or a rod-shaped body made of a heat-resistant resin. The conveyance belt as described in any one of Claims.   The conveyor belt according to any one of claims 1 to 6, wherein the sewing thread is formed by impregnating a heat resistant fiber with a heat resistant resin and firing.

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