JPH0880581A - Conveyor belt manufacturing method - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a method for manufacturing a conveyor belt which is less likely to be destroyed than before. [Structure] A bead 2 having a convex portion 5 is fused with the belt holding portion 4 sandwiched between the belt holding portions 4 and a belt body 3 having a through portion 7 having a diameter larger than a thread diameter in the vicinity of the peripheral portion. It is characterized in that the molten bead material 2 is also made to flow into the penetrating portion 7 to be solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a conveyor belt used for a curve conveyor or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, in a curved conveyor, for example, a bead having a convex portion 52 on the outer peripheral edge of a belt main body 51 in order to prevent movement of the conveyor belt 50 in the inner peripheral direction. 53 and the convex portion 52 of the bead 53.
A belt holding device 54 that supports and guides is provided.

As shown in FIG. 6, on the bead 53, a belt holding portion 55 for holding the outer peripheral edge of the belt main body 51 is provided with a convex portion 52.
And are formed integrally with it. And the conveyor belt
When manufacturing 50, the outer peripheral edge of the belt main body 51 was sandwiched between the belt clamping portions 55 of the beads 53 and integrally sewn.

However, during use, the belt holding device 54 exerts a force on the bead 53 to prevent the conveyor belt 50 from moving in the inner peripheral direction, and the bead 53 and the belt main body 51 are displaced from each other. As a result, there is a problem that tearing starts from the sewing thread 56, and as a result, the conveyor belt 50 is easily broken.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention
It is intended to provide a method for manufacturing a conveyor belt that is less likely to be destroyed than before.

[0006]

In order to solve the above problems, the present invention takes the following technical means.

In the method for manufacturing a conveyor belt according to the present invention, the bead having the convex portion is fusion-bonded between the belt clamping portions while sandwiching the peripheral edge of the belt main body having the penetrating portion having a larger diameter than the thread diameter in the vicinity of the peripheral edge. The molten bead material is caused to flow into the penetrating portion of the belt body to be solidified.

[0008]

The present invention has the following actions.

A conveyor manufactured by the method of the present invention
According to the belt, when the bead and the belt body are trying to separate from each other during use, the anchor effect can be obtained between the fused surfaces of the bead and the belt body as well as the molten bead material that has solidified into the penetration part of the belt body. However, since the molten bead material that has flowed into the through-hole and solidified is larger than the thread diameter, the tearing is greater than that in the conventional thread sewing method that has a large stress concentration. The stress on the is distributed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the conveyor belt 1 of this embodiment is basically manufactured by fusing a bead 2 and a belt main body 3 together.

The bead 2 is in the form of a loop having a generally arcuate shape in plan view, and a belt holding portion 4 is formed in a substantially U-shaped cross section. Then, a convex portion 5 having a substantially semicircular cross section is formed at the end portion on the upper surface side so as to project. This convex part 5
Is for supporting and guiding by a belt holding device 6 (see FIG. 2) described later. Further, in this embodiment, the thermoplastic polyurethane elastomer is adopted as the material of the bead 2, but any other suitable material having a fusible property can be selected.

On the other hand, the belt main body 3 is configured so that the peripheral edge thereof is sandwiched from the upper and lower surfaces by the belt clamping portion 4 of the bead 2 having a substantially U-shaped cross section. In addition, the through portion 7 having a diameter larger than that of the thread when manufactured by conventional sewing is used.
A plurality of them are formed at regular intervals along the peripheral edge. In this embodiment, the cross-sectional shape of the penetrating portion 7 is circular, but other appropriate shapes can be used. Further, in this embodiment, a thermoplastic polyurethane elastomer is used as the material of the belt body 3, and a material having a suitable fusion property with the bead material is used.

Next, a method of manufacturing the conveyor belt 1 of this embodiment will be described. First, the peripheral edge of the belt main body 3 is sandwiched between the belt sandwiching portions 4 of the bead 2 having a substantially U-shaped cross section. Then, by using a known fusion-bonding die (not shown) in this sandwiched state and irradiating a high frequency by a known method, the inner peripheral side of the convex portion 5 of the belt clamping portion 4 of the bead 2 The brim portions 8 and the belt body 3 are fused.
Since this region has a small thickness, there is an advantage that the fusion treatment is relatively easy as compared with the case where the region including the convex portion 5 is also fused. At this time, the molten bead material is also made to flow into the penetrating portion 7 of the belt body 3 so as to be solidified.

That is, the brim portion 8 of the bead 2 and the belt main body 3 are fused together at their contact surfaces, and the bead 2
The belt holding portions 4 are connected to each other at the penetrating portion 7 of the belt body 3 by the solidified bead material.

Next, the usage state of the curved conveyor using the conveyor belt 1 manufactured by the method of this embodiment will be described.

As shown in FIGS. 2 to 4, this curve
The conveyor comprises a frame 9 formed in an arc shape and a taper / rotatably supported at each end of the frame 9.
In order to prevent the pulley 10 and the looped conveyor belt 1 stretched in an arc shape along the frame 9 between the taper pulley 10 at the end and the inner movement of the conveyor belt 1. It has a belt holding device 6 for holding the outer peripheral edge of the conveyor belt 1 and a mount 11 for supporting the frame 9 in a predetermined posture, and one of the taper pulleys 10 is rotated by a motor 12. The conveyor belt 1 is driven to rotate.

The frame 9 includes left and right support members 13 and 14,
The belt mounting plate 15 is provided between the supporting members 13 and 14, and the upper surface position of the belt mounting plate 15 is set to correspond to the upper surface position of the taper pulley 10.
A pair of bearing units (not shown) are respectively provided at the start end and the end of the frame 9, and the taper pulley 10 is rotatably supported by the bearing units. There is.

The belt holding device 6 includes an upper conveyor,
An upper rotating body 16 rotatably abutting on the convex portion 5 of the bead 2 of the belt 1, and a central rotation rotatably abutting on the surfaces of the upper and lower conveyor belts 1 on which the convex portion 5 of the bead 2 does not exist. Body 17 and bead 2 on the lower conveyor belt 1
And a lower rotary body 18 that rotatably abuts on the convex portion 5 of FIG.

By the way, at the time of use, the belt holding device 6 exerts a force on the bead 2 to prevent the conveyor belt 1 from moving in the inner circumferential direction, so that the bead 2 and the belt body 3 are displaced from each other and separated from each other. In such a case, the bead 2 and the belt body 3 can be prevented from being separated from each other by the anchor effect not only by the fusion-bonding surfaces of the belt body 3 but also by the molten bead material that has flowed into the penetrating portion 7 of the belt body 3 and solidified. Here, since the molten bead material that has flowed into the penetrating portion 7 and solidified is larger than the thread diameter, the stress for tearing is dispersed more than that in the conventional thread sewing method in which the stress concentration is large. Therefore, there is an advantage that destruction is less likely to occur than in the past.

In other words, the adhesive strength between the belt body 3 and the brim portion 8 of the bead 2 is increased by the mechanical anchoring effect of the molten bead material flowing into the penetrating portion 7 as well as the overall fusion force at the contact surface. There is an advantage of improving. That is, the strength can be remarkably increased by obtaining a mechanical anchoring effect, instead of relying only on the adhesive strength between the fused surfaces of the belt body 3 and the beads 2.

Further, even when the width of the brim portion 8 of the bead 2 is restricted due to the dimensional factors of the curve conveyor, the fusion processing can be performed even in a short area, unlike the case of sewing. Thereby, sufficient fixing strength of the bead 2 to the belt body 3 can be obtained.

[0023]

The present invention having the above-mentioned structure has the following effects.

Since the stress against tearing is more dispersed when used than in the conventional thread sewing method, it is possible to provide a method of manufacturing a conveyor belt which is less likely to be broken than the conventional method.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view of a main part for explaining an embodiment of a conveyor belt manufactured by the method of the present invention (the state before fusion is shown).

2 is a cross-sectional view of a main part for explaining a curved conveyor using the conveyor belt of FIG.

FIG. 3 is a diagram showing a taper pulley of the curved conveyor shown in FIG. 2 and a motor for rotating it.

FIG. 4 is a plan view illustrating the curved conveyor of FIG.

FIG. 5 is a cross-sectional view of a main part for explaining a curved conveyor using a conveyor belt manufactured by a conventional method.

FIG. 6 is an enlarged sectional perspective view illustrating the conveyor belt of FIG.

[Explanation of symbols]

 2 bead 3 belt body 4 belt holding part 5 convex part 7 penetration part

Claims (1)

[Claims] 1. A bead having a convex portion is fusion-bonded to a belt main body having a peripheral portion of a belt main body having a penetrating portion having a diameter larger than a thread diameter in the vicinity of the peripheral portion, and is also fused to the belt main body. A method for manufacturing a conveyor belt, which comprises injecting a molten bead material to solidify it.