JP2002226025A - Joint structure for round conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the flexibility of a belt and the toughness of an outer periphery portion of a belt in contact with a roller as well as a stable press contact condition between the roller and the belt in running the sector round conveyor belt, in a plan view, with an elliptical belt material joined as its edges by holding a portion close to the outer periphery of the belt at its both surface and reverse sides between a pair of rollers. SOLUTION: The sector belt material having a canvas 2 with its surface covered with a cover resin layer 3 is joined at its edges with a bushing and linear joint portion 4 having lighting-shape edges 5, 5 and linear edges 6, 6 abutted to each other. At a linear abutted portion close to the outer periphery of the belt, where at least the roller is rolled in press contact, out of the joint portion 4, a reinforcing woven cloth member 7A is embedded in the cover resin layer 3 covering the surface of the belt canvas 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of a round conveyor belt, and more particularly, to a device for running the belt by sandwiching the outer peripheral portion of the belt from both the front and back surfaces of the belt with a pair of rotary driving rollers. The present invention relates to a joining structure of a round conveyor belt which is particularly suitable for attaching a belt.

[0002]

2. Description of the Related Art Round conveyor belts are arranged at both ends of a pair of parallel conveyor belts or at both ends or a crossing of a pair of conveyor belts crossing each other at their ends, and are conveyed by belts. This contributes to the smooth change of direction of the transferred object.

In a belt of this type having a fan shape in a plan view, the whole belt has a structure similar to a truncated cone by joining edges of a fan-shaped canvas material in an expanded state and connecting them endlessly. . A round conveyor belt in which the side surface of a truncated cone is crushed to one side and flattened in a fan shape in a plan view is wound around a pair of pulleys provided on a conveyor frame, and assembled into a series of belt groups to be belted. The conveyor is assembled.

The peripheral speeds of the inner and outer edges of this specially shaped round conveyor belt are naturally not the same, and the load conditions on the inner and outer peripheral edges of the belt during belt driving are also different. The manner of joining the edges of the fan-shaped canvas material is also variously different.

For example, the joint structure of a round conveyor belt disclosed in Japanese Utility Model Publication No. 2-214949 has an overlapped structure in which a canvas material of the belt is overlapped with an outer guide portion serving as a guide member mounting portion of the belt. The inner main body has a joint structure in which the zigzag edges are nested with each other in a zigzag manner. At the joint portion of the belt, means having a different joint structure is used for each belt portion.

In the belt disclosed in Japanese Utility Model Publication No. 2-214949, the inner portion of the main body formed by nesting the zigzag edges of the belt is more flexible than the outer peripheral portion, and the belt is smooth. The lap-shaped joining outer peripheral portion of the canvas material of the belt facilitates running, and is engaged with the guide member due to its rigidity, which greatly contributes to securing the toughness of the belt.

[0007]

The manner in which the edges of the belt material are joined together for the endurance of the round conveyor belt depends on changes in the installation form of the belt in a series of conveyor belt devices or the drive form of the belt itself. It is desirable to respond. The present invention relates to, as one of belt driving forms, a round conveyor belt joint suitable for holding a portion of the belt near the outer periphery on both sides of the belt with a pair of rollers and causing the belt to run along with the rotation of the rollers. It does not provide a structure.

[0008] The belt disclosed in Japanese Utility Model Publication No. 2-214949 was attached to a device for holding the front and back surfaces of the belt with a pair of rollers under high pressure and forcibly running the belt by rotating the rollers. In this case, the belt outer peripheral part using the overlap type has sufficient rigidity and toughness to prevent the occurrence of cracks and the like during the belt traveling, so that the belt can travel sufficiently. The presence of the overlapped portion causes a large stepped portion to be formed in the overlapped portion, causing the rollers to jump when the belt runs, resulting in abnormal noise and noise, which also disturbs the working environment.

[0009] The present invention corresponds to a device for clamping a belt near its outer periphery from both front and back surfaces by rollers and forcibly traveling the belt, that is, a roller-type belt clamping / running unit, as a traveling drive source of the round conveyor belt. SUMMARY OF THE INVENTION It is an object of the present invention to provide a conveyor belt having a joint capable of adapting to high-pressure running by a driving roller.

[0010]

In order to achieve the above object, the present invention employs the following configuration. In other words, the joint structure of the round conveyor belt according to the present invention is such that the edges are nested in the endless round conveyor belt formed by joining the edges of an arcuate (fan-shaped) canvas belt material. A butt-joining structure that includes a butt-joining structure that includes at least a belt-holding-rolling unit that is driven by a belt-driving roller. The woven fabric piece is embedded in a cover resin covering the surface of the canvas to reinforce the joint portion of the belt.

The embedding region of the reinforcing woven fabric piece is limited to the region near the outer periphery of the belt in the belt joining portion corresponding to the rolling region of the roller, so that the main portion of the belt is reinforced and the belt is reinforced. Flexibility can be maximized.

Alternatively, the embedment area of the woven fabric piece extends over the entire length of the butt portion in the belt width direction which coincides with the center direction of the belt, and the entire edge joining portion of the belt can be strongly reinforced.

The joint extending in the width direction of the belt has a joint structure in which lightning-like edges are nested with each other over the entire length thereof, so that the entire joint can be reinforced.

Alternatively, the joining portion extending in the belt width direction has a linear butting structure at a portion closer to the outer periphery of the belt, which is a pressure contact region of the pair of rollers, and a remaining portion closer to the inner periphery of the belt has a lightning edge. Without nested butting structure,
By adopting a joining structure in which the joining portions have different butting structures, a unique effect can be obtained for each joining location. In other words, in the nested butt joint with the lightning edge, the toughness of the belt joint is increased, and in the butt joint of the linear edge, the intersection area of the joint with the roller is reduced, so that the joining is reduced. It can greatly contribute to the reduction of cracking and peeling of parts.

The woven cloth pieces embedded in the outer peripheral portion of the belt can sufficiently cover the pressure contact area of the roller group with the belt because local stress generated at the side edge of the roller is required. It is also necessary in order to prevent the occurrence of damage to the butt joint due to the concentration of the butt joint.

As described above, the selection of the length of the short woven piece and the length of the long woven piece extending over the entire width of the belt, the nested and linear butting, and the joining structure thereof are respectively limited to only the portion of the embedded woven piece near the outer periphery of the belt. A belt suitable for the intended use can be appropriately selected by selecting a different joining portion and combining the woven fabric piece embedding portion with a joining portion having a different configuration.

[0017]

Embodiments of the present invention will now be described with reference to the drawings. The canvas 2 constituting the belt material is
It is woven with polyester fiber, nylon fiber, vinylon fiber, aramid fiber, or a fiber yarn of these blended fibers alone or blended with low elongation, and this canvas is impregnated with thermoplastic resin such as urethane resin or PVC resin. Alternatively, the surface is coated, and a cover resin layer 3 made of a thermoplastic resin, for example, a polyurethane resin or a PVC resin is formed on the surface, and the canvas is cut into a fan shape to form a belt material (a) shown in FIG. ) Is formed.

Both end edges of the fan-shaped belt material (a) are butted against each other for endlessness and joined using a polyurethane-based adhesive or the like, and the belt material formed into a truncated conical shape as a whole is formed of the same material. The material surface is crushed to form a fan-shaped round conveyor belt 1 having a transport surface 11 on the front surface and a return surface 12 on the rear surface. The belt has a pair of ends on the traveling side and the rear side. It is wound around pulleys (b) and (b) (see FIG. 1).

The feature of the present invention resides in a joining portion between both ends of the fan-shaped belt material (a) for endlessness. As shown in FIGS. 1 and 2, the joint 4 extending over the entire width of the belt is such that the lightning edges 5, 5 at both ends of the belt material (a) are nested with each other in a nested manner, or as shown in FIGS. As shown in FIG. 4, a straight edge 6 and a straight edge 6 are butted to a joining portion 4 near the outer periphery of the belt to which the sandwiching roller is pressed, and a lightning edge 5 is joined to the joining portion 4 near the inner periphery of the belt. 5 are nested in a nested manner, and the belt materials are joined flush with each other using an adhesive or the like.

FIG. 5 shows at least one of the joining portions 4 which is at least a forced driving source of the belt. The driving roller (c) and the pressing roller (d) (e) are provided near the outer periphery of the belt. In the cover resin layer 3 of the canvas 2, a reinforcing woven cloth piece 7 is made of a polyurethane-based adhesive or the like at a portion near the outer periphery of the belt that intersects with the rollers of the roller-type belt nipping and traveling unit (f) composed of The canvas 2 is stuck to the surface of the canvas 2 and is further embedded in the cover resin layer 3 of the canvas 2.

The reinforcing woven cloth piece 7 is made of a multifilament or monofilament plain woven cloth or twill woven cloth made of polyester, nylon, vinylon, or the like having excellent durability. The woven cloth piece 7 has the same type as the cover resin layer. It is impregnated with a resin material, for example, a polyurethane adhesive. The weaving density of the woven cloth pieces is 30-80 / 5cm,
The denier of the filament is limited to the range of 250d to 1000d.

That is, when the weaving density is less than 30/5 cm, the sufficient reinforcing effect required for the woven fabric piece cannot be expected. On the other hand, when the weaving density is more than 80/5 cm, the rigidity of the woven fabric piece becomes too large, and the belt itself has Flexibility deteriorates. In addition, if the filament denier is less than 250 d, a sufficient reinforcing effect required for the woven fabric piece cannot be expected, and on the contrary, 10%.
If it is more than 00d, the stiffness of the woven cloth becomes too large, and the flexibility of the belt itself becomes poor.

The thickness of the reinforcing woven cloth 7 is 0.1 mm to 0.1 mm.
The cover resin layer 3 for embedding the woven cloth piece 7 has a thickness of 0.1 mm to 0.5 mm, and the cover resin layer 3 has a thickness of 0.1 mm to 0.5 mm. The woven cloth piece 7 is completely embedded in the cover resin layer 3, or the surface of the cover resin layer 3 and the woven cloth piece 7 are flush with each other, and the surface of the woven cloth piece 7 is covered with the cover resin layer 3. It is buried in a state where it is exposed.

The joining portion 4 extending in the belt width direction, which is composed of two types of edges, that is, the butting of the straight edges 6 and 6 and the butting of the lightning edges 5 and 5 shown in FIG. An example of a folding joining means for embedding a reinforcing woven cloth piece 7A at the abutting portion of the end edges 6, 6 will be described with reference to FIGS. 7 (a), 7 (b) and 7 (c). A part of the cover resin layer 3 which is located at both ends of the belt material in the separated state and located at the linear edges 6 and 6 is previously removed by a puffing means or the like,
The surface of the canvas 2 is exposed (see FIG. 7A). Thereafter, both ends 5, 5, 6 and 6 are abutted in a nested manner with an adhesive, and the remaining portions are abutted in a straight line to connect both ends of the belt material (see FIG. 7B). . A piece of woven cloth 7A is adhered to the surface of the canvas 2 via an adhesive over the joined linear edges 6 and 6, and then the same resin as the cover resin layer 3 is applied to the removed portion 14 of the cover resin layer 3. The material 3A is filled (see FIG. 7 (c)), and the reinforcing woven fabric piece 7A is connected by connecting the joining edge portion of the belt and fusing the filling resin material 3A to the cover resin layer 3 by hot pressing means or the like. The burial at a predetermined location is completed.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG. 1 (embodiment 1), it is located on a nested joint of lightning-like edges 5, 5 of a joint 4 extending in the full width direction of the belt, The woven cloth piece 7A to be embedded is limited to a very small portion near the outer periphery of the belt, and is in a range that completely covers the rolling contact area of the belt driving rollers (c) and (d) that sandwich the outer periphery of the belt from both sides of the belt. The length (L) of the woven cloth piece 7A extending in the belt width direction from the outer peripheral edge of the belt, and the width (W) of the woven cloth piece corresponding to the belt circumferential direction are in a range covering the outer portion of the nested joint 4. And the nested joint portion 4 located on the inner peripheral side of the belt is left exposed as it is. In this embodiment, the flexibility of the belt 1 is kept good.

In FIG. 2 (Embodiment 2), the woven cloth piece 7B extends the woven cloth piece 7A of (Embodiment 1) to the entire width of the belt, and the nested joint portion 4 of the belt. Is embedded in the cover resin layer 3 so as to cover the entire surface of the cover resin layer 3. In this embodiment, reinforcement of the entire nested joint of the belt can be expected.

In FIG. 3 (Embodiment 3), of the joining portion 4 of the belt material extending in the belt width direction, a portion near the outer periphery of the belt is abutted by straight edges 6, 6. The remaining portion closer to the inner circumference of the belt is formed by abutting of lightning-like edges 5, 5, and the embedding portion of the reinforcing woven fabric piece 7A to be embedded so as to cover the joint 4 is a straight end. The butt portions of the edges 6, 6 are limited, and the butt portions of the lightning edges 5, 5 are lacking the woven cloth pieces. In this embodiment 3, in the belt material joining portion 4 which is pressed in a crossing manner with the roller, the joining portion 4 of the belt material is constituted by a butt portion of the linear edge 6, so that the intersection region with the roller is in the joining region. It is limited to only a few straight portions, and the occurrence of cracking phenomena due to press-contact fatigue of the joint 4 with the roller is suppressed as much as possible. The belt inner peripheral portion can maintain the flexibility of the belt itself by lacking a woven cloth piece, and the toughness of the belt due to the nested butt joining of the belt material.

In FIG. 4 (Embodiment 4), the joining portion 4 of the belt material is abutted on the straight edges 6 and 6 and the lightning edges 5 and 5 in the same manner as in Embodiment 3. The reinforcing woven cloth piece 7B located on the joint 4 is embedded in the entire length of the joint 4, that is, over the entire width of the belt.
In this embodiment 4, since the cross-joining portion with the roller is locally limited to the butt portion of the linear edge, the contact fatigue with the roller at the joining portion is reduced similarly to the above-mentioned embodiment 3. The occurrence of the accompanying cracking phenomenon is suppressed. The embedding of the woven fabric over the entire length of the belt joint also reinforces the joint, which is the largest weak point of the belt.

(Experimental Example) Next, a running experiment was conducted on a round conveyor device employing a running system in which a portion of the belt near the outer periphery on both front and back sides was sandwiched between a pair of driving rollers, with the following common conditions. Each round conveyor belt was used.

(Common conditions) Belt type: NS41UR0 / 5G (made by Mitsuboshi Belt) Thickness of canvas belt body: 1.0 mm Belt width (joining width): 250 mm Belt spreading angle: 90 ° Belt speed: 36m / min (measured at the approximate center of the belt width)

(Belt Form Used in Experiment) (Comparative Example: 1) A belt employing a nested butting system in which all light-emitting edges extend in the belt width direction. (Comparative Example: 2) Actual fairness 2-214 owned by the present applicant
No. 49, disclosed in Japanese Patent Publication No. 49, a belt inner body portion having a nested butting joint structure of lightning edges, while a belt outer peripheral portion of the body portion is overlapped with a partially extended portion of a belt canvas material. Belt adopting 50mm length overlap structure. (Example 1) A width (W) of 1 was used as the reinforcing woven cloth piece 7A.
00 mm, length (L) of 60 mm, and a thickness of 250 in the longitudinal direction made of polyester multifilament yarn.
d, density 45 lines / 5 cm, thickness 250d in the horizontal direction,
Using a plain woven cloth with a density of 49/5 cm and a thickness of 0.2 mm,
The woven fabric piece is buried in a cover resin layer having a thickness of 0.45 mm near the outer periphery of the belt, and the entire structure is formed of a lightning-like butt joint. Become a belt. (Example: 3) Thickness and size of the reinforcing woven cloth piece 7A
And the thickness of the cover layer is the same as that of the first embodiment, and the joining portion of the belt material is formed of a combination of a linear shape and a lightning shape, and the woven cloth piece 7A is embedded only in the linear butted portion. Example: A belt adopting a joint structure composed of three.

(Experimental Results) Comparative Example 1: In the case of the belt of No. 1, there was no occurrence of roller jumping, abnormal noise, and noise.
After a lapse of 36 hours, a cracking phenomenon occurs at the nested butt joint near the outer periphery of the belt which is in pressure contact with the roller. Comparative Example: In the case of the belt of No. 2, no cracking phenomenon occurred in the belt even after 336 hours had passed, but the difference was remarkable because of the step corresponding to the amount of overlap of the canvas material caused by the overlap of the canvas material at the joint. Rolling up of abnormal rollers, noise, and noise were observed. In the present embodiment, in the belt of the first embodiment, there is no occurrence of roller jumping, abnormal noise, and noise. However, after a lapse of 700 hours, a crack occurred at the belt joint. In the present embodiment: With the belt of No. 3, there is no occurrence of jumping of the roller, abnormal noise and noise. In addition, no abnormality such as the occurrence of a cracking phenomenon is observed in the belt joint after 1000 hours.

[0033]

The round conveyor belt according to the present invention is finished endlessly by joining the edges of a belt material having a fan shape in plan view. In this belt, the driving of the belt is realized by holding the portion near the outer periphery of the belt with a pair of rollers from both sides of the belt and driving the rollers by pressure. This belt has a joint structure that extends in the width direction of the belt, which is necessary for endlessness. The lightning or linear edges provided at both ends of the belt material are joined together, and at least a part of the belt joint is nested. This greatly improves the flexibility of this type of belt with a high degree of bending fatigue and strengthens the joint, and at the same time, the degree of progress of the brittleness is increased by the pressure contact between the driving roller and the joint. A reinforcement woven piece is buried in the cover resin layer at the largest joint portion near the outer periphery of the belt, and the part is locally reinforced, thereby extending the life of the belt. The embedding in the cover layer can completely suppress the roll-up phenomenon of the roller or the generation of abnormal noise and noise due to the roller even in the cross-rolling by the roller repeated in this portion.

In the round conveyor belt of the second aspect, the embedding operation of the woven cloth piece is simplified by limiting the embedment area of the woven cloth piece only to a portion of the nested joint near the outer periphery of the belt. The buried area is limited, and the other part of the nested joint is left as it is, so that the flexibility of the belt is better maintained.

In the round conveyor belt according to the third aspect of the present invention, the embedment area of the woven fabric piece is applied to the entire area of the nested joint portion, so that the entire joint portion of this type of belt, in which deterioration progresses fastest, is performed. Reinforced, which can greatly contribute to extending the life of the belt.

In the round conveyor belt according to the fourth aspect, the embedding operation of the woven fabric piece is simplified by limiting the embedment area of the woven cloth piece to a linear butting portion near the outer periphery of the belt in the joining portion. In addition, the embedment portion of the woven fabric piece, that is, the junction at the intersection with the roller has a linear shape with the minimum intersection area with the roller, and a reinforcing woven fabric piece is coated on the linear junction. Since it is embedded in the belt, it is effective in suppressing a belt cracking phenomenon caused by peeling from the joint.

In the round conveyor belt according to the fifth aspect of the present invention, the embedment area of the woven fabric piece is performed over the entire length of the joining portion corresponding to the belt width direction, so that this kind of belt has the most deterioration. Reinforcement of the entire joint that progresses, and furthermore, the joint at the point of intersection pressure contact with the roller has a linear shape with the minimum intersection area, and a reinforcing woven fabric piece is embedded in the covering on the linear joint. As a result, it is possible to effectively prevent the belt from being broken due to peeling from the joint.

[Brief description of the drawings]

FIG. 1 is a plan view of a round conveyor belt embodying the present invention (Example 1).

FIG. 2 is a diagram corresponding to FIG. 1 showing another embodiment (Example: 2).

FIG. 3 is a view corresponding to FIG. 1 showing still another example (Example: 3).

FIG. 4 is a view corresponding to FIG. 1 showing still another embodiment (Example: 4).

FIG. 5 is an explanatory view showing a traveling mode of a belt using a roller-type nipping traveling unit.

FIG. 6 is a developed view of the partially cut belt material according to the present invention before the edges are joined.

FIGS. 7 (a), (b) and (c) are explanatory views of a procedure for embedding a woven fabric piece into a belt joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Round conveyor belt 2 Canvas 3 Cover resin layer 4 Joining part 5, 5 Lightning edge 6, 6 Straight edge 7 Reinforcement woven cloth piece A Fan belt material C Driving roller D Holding roller E Holding roller F Roller belt Nipping traveling unit

Claims (6)

[Claims] 1. A joining portion of a round conveyor belt in which edges of an elliptical (fan-shaped) belt canvas material whose surface is covered with a cover resin layer is made endless,
The edges are joined to each other and joined, and at the joint,
Intersects with the rollers of the roller-type nipping and traveling unit that drives the belt by nipping the part near the outer peripheral part of the belt,
A joining structure of a round conveyor belt in which a reinforcing woven fabric piece is embedded at least in a cover resin layer at a portion near an outer periphery of a belt joining portion. 2. A joining portion extending in the belt width direction between edges of the fan-shaped belt material is formed by nesting butting of lightning-like edges, and the reinforcing woven fabric piece is formed by the nesting butting joint. 2. The round conveyor belt joining structure according to claim 1, wherein the bonding structure is embedded in the cover resin layer in a portion near the outer periphery of the belt. 3. A joining portion extending in the belt width direction between edges of the fan-shaped belt material is formed by nesting butting of lightning-like edges, and the reinforcing woven fabric piece is formed by the nesting butting joint. The joint structure for a round conveyor belt according to claim 1, wherein the joint structure is embedded in the cover resin layer over the entire length of the belt. 4. A joining portion extending in the belt width direction between the edges of the fan-shaped belt material is formed by abutting a straight edge at a portion closer to the outer periphery of the belt, and the remaining joining portion is formed by a nested butting of a lightning-like edge. The joint structure of a round conveyor belt according to claim 1, wherein the reinforcing woven fabric piece is configured in combination with a joining structure, and the reinforcing woven fabric piece is embedded in a cover resin layer at a butt joining portion of the linear edges. 5. A joining portion extending in the belt width direction between the edges of the fan-shaped belt material has a butting structure of a straight edge near the outer periphery of the belt and a nesting butting of a lightning-like edge on the remaining joining portion. The round conveyor belt according to claim 1, wherein the reinforcing woven fabric piece is embedded in the cover resin layer of the joining portion over the entire length of the joining portion having the two different configurations. Joint structure. 6. The weaving density of the woven cloth pieces is 30 to 80 fibers / 5c.
m, filament denier is 250d-1000d
The joint structure of a round conveyor belt according to any one of claims 1 to 5, wherein: