JPH08270736A - Connecting structure for belt with crosspiece - Google Patents

Abstract

PURPOSE: To increase a bending life in a connecting part by forming composite connecting structure consisting of overlap connection in a V-shaped crosspiece area, in which bending stress in the connecting part is concentrated, and a zigzag finger connection in the residual area other than a U-shaped crosspiece area. CONSTITUTION: In a part M other than a V-shaped crosspiece area, to which a V-shaped crosspiece 3 is connected, in a belt main body 2, the tips of a cover member 5 and canvas 4 which are integrally laminated are cut into V-shaped zigzags with the predetermined length and width, and consequently, one end part 2A is formed, while in the same way, the other end part 2B is formed opposedly to the one end part 2A, and then, both end parts 2A, 2B are connected together endlessly while the zigzag end parts are matched and inserted to each other. Both end parts 2A', 2B' of a belt main body in the V-shaped crosspiece area N to which the V-shaped crosspiece 3 is connected are overlapped with each other by the predetermined quantity, and overlap connection structure in which one end part 2A' and the other end part 2B' overlap each other is provided The overlapping quantity in the overlap connection is 10-50mm ordinarily, and it is 15-35mm desirably for a bending characteristic of a belt and compliance with a small pulley diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a belt with a joint,
Specifically, it is a belt in which a V-shaped sleeve for preventing belt meandering is provided on the surface of one or more ply tensile canvas and the lower surface of a belt main body thinly coated with a thermoplastic resin or rubber between plies. The present invention relates to a joint structure of a belt with a cauldron for light transportation of a lightweight material such as a chemical agent indoors.

[0002]

2. Description of the Related Art Conventionally, a light-carrying belt with a lever has been used in which a belt-shaped belt main body is provided with a V-shaped groove for preventing the belt from meandering for the purpose of preventing the belt from meandering and dealing with a small pulley diameter. However, as shown in FIG. 8, the joining structure of the belt with a joint includes both joining end portions 22A of the belt body 22,
22B is cut into opposite V-shaped zigzags having opposite phases, and both end portions 22A and 22B are abutted to form an endless finger joint structure, and the back surface side thereof has a center portion or both ends in the width direction. A belt 21 with a joint formed by welding a V-shaped joint 3 in the longitudinal direction of the belt at a position of a portion is known.

[0003] More specifically, the actual Kaihei 2-10632
In Fig. 3, a finger joint structure of a resin belt is characterized in that a reinforcing sheet having an area capable of covering a joint interface is integrally laminated at a joint portion where a bending stress in a width direction of the resin belt is concentrated as a finger joint structure of a belt with a finger. A structure is disclosed.

[0004]

However, in the conventional finger joint structure, as compared with the overlap joint structure, the joint strength of the finger joint structure decreases in relation to the difference between the joint region and the joint region. When a meandering prevention sleeve is installed on the back surface of the belt (especially on the canvas surface), due to the one-sided loading condition of the conveyed object, the belt comes into contact with the V groove of the pulley and a strong force is applied in the belt width direction. As a result, cracks were generated along the finger shape at the peripheral portion of the shaft, which was a factor of early cutting of the belt.

Further, compared with the above-mentioned finger joint structure, the finger joint structure in which a reinforcing sheet is laminated has a tensile cloth and a bending stress because the front and back surfaces of the finger joint are covered with a reinforcing cloth on the areas where stress concentration occurs. On the other hand, it is excellent in that it is sufficiently reinforced to prevent cracks at the adhesive interface of the finger joints, but there is a drawback that cracks still occur at the adhesive interface of the finger joints at a small pulley diameter and / or at high speeds.

The present invention has been made as a result of intensive studies to solve the above-mentioned problems. In consideration of stress acting in the belt width direction by partially modifying the joint structure of the finger joints, The structure of the joint part of the belt with a joint is sufficient to withstand even a small pulley diameter, and has the effect of increasing the bending life of the joint part of the V-shaped joint region for preventing meandering and the joint portion of the remaining region excluding the V-shaped joint region. It is intended to be provided.

[0007]

In order to achieve the above-mentioned object, the present invention is characterized in that at least one ply of canvas is used as a core layer and a thermoplastic resin or rubber is coated between the surface and each ply. Both ends of a belt with a joint, in which a V-shaped casing extending in the belt longitudinal direction is joined to the front or back side of the laminated belt body, are cut in zigzag shapes opposite to each other, and the zigzag ends are butted. In the joint structure of the fitted belt with a joint, the joint of the V-shaped joint region where the bending stress of the joint is concentrated is an overlap joint,
A joint structure for a belt with a joint is characterized in that the joint of the remaining region excluding the V-shaped joint region is formed by a composite joint structure in which a zigzag finger joint is formed.

[0008]

The joining structure according to the present invention is a composite joining structure of overlapping joints in the V-shaped cauldron region and finger joints in the remaining region so that the flexibility of the belt corresponding to the small pulley diameter is maintained by the finger joints. Further, cracks in the caulked area can be prevented by the overlapped joint having a good joint retention rate, so that the belt can be prevented from meandering and can easily cope with a small pulley diameter, and the life of the caulked belt can be greatly extended.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The joint structure of a light-carrying belt with a joint according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a bottom view of an embodiment of the present invention, and FIG. 2 is an X of FIG.
-X sectional view, FIG. 3 is a sectional view taken along the line YY of FIG. 1. In these drawings, reference numeral 1 is a belt with a zipper, and a V-shaped zipper 3 is fixed to the lower surface of a belt-shaped belt body 2. , Belt body 2
Is canvas 4, specifically cotton, polyamide, polyester,
Polyurethane, PVC or other thermoplastic resin or NR, SBR, NBR, EPR, E on one or both sides of a canvas 4 made by impregnating or coating a thermoplastic resin such as polyurethane or PVC on vinylon or other fiber woven fabric.
A cover material 5 made of a single material such as PT, IIR, IR, BR, or a rubber obtained by blending these materials is laminated and coated to form the belt body 2.

In the above-described belt, the joining structure of both ends of the belt is such that the portion M excluding the V-shaped cauldron region to which the V-shaped caulks are bonded is at both ends 2A and 2B of the belt main body 2.
One end 2A is formed by cutting the ends of the integrally laminated cover material 5 and canvas 4 into a V-shaped zigzag having a predetermined length and width, and similarly the other end 2B is formed so as to face the one end 2A. Then, the both ends 2A and 2B have a conventional finger joint structure in which zigzag-shaped end portions are abutted in a nested manner and joined endlessly.

Both ends 2A 'and 2B' of the belt body in the V-shaped groove area N to which the V-shaped groove is adhered are overlaid by overlapping one end 2A 'and the other end 2B' with a predetermined length of overlapping margin. Use a lap joint structure. The overlap margin at the time of this overlap joining is usually 10 due to the flexibility of the belt and the small pulley diameter.
Regulate within a range of 50 mm, more preferably 15-35 m
It is formed in the range of m. Further, the width of the V-shaped cauldron region N is set to have a distance of 5 mm or more from the upper width of the V-shaped cauldron.

Here, if the overlap margin is less than 10 mm, there is a problem that the endless joint part causes shear fracture, while if the overlap margin is 50 mm or more, the rigidity becomes too high and the joint part is cracked when bent by a pulley. is there. If the width of the V-shaped cauldron N is less than 5 mm, the V-shaped cauldron may crack when it rides up. That is, in the joint portion of the belt main body 2 of the belt with a joint, the portion M excluding the V-shaped joint area has a Figer joint structure, and the V-shaped joint area N has an overlap joint structure. There is.

The overlap joint structure of the V-shaped groove region is formed by removing one surface cover layer 5 of the overlap margin portion of the belt body located on the back surface side as shown in FIG.
Is formed, and a thin resin or rubber sheet of the same material as the cover layer or an adhesive agent is interposed in the removed portion, and the overlap margin portion 2A ′ of the belt main body located on the front surface side is overlapped, and heat fusion or adhesion is performed. To join. In this way, an endless belt having a joint structure of a belt with a joint is completed by fixing or welding a V-shaped joint 3 extending in the longitudinal direction of the belt on the back surface side of the belt main body to which both ends are joined.

Although the case where the core canvas 4 has one ply has been described above, the core canvas of not only one ply but also the two-ply core canvas shown in FIGS. 4 and 5 can be applied by the same means as the above-mentioned joining structure. be able to. That is, both end portions 12A, 12 of the portion M of the belt body 12 excluding the V-shaped groove area
B is cut toward the body in a V-shaped zigzag shape to form a nested butted finger joint, and both ends 12 of the V-shaped shell region N are joined together.
A ′ and 12B ′ overlap joining is performed.

Next, the effect of the belt joint portion of the jointed belt joint structure according to the present invention will be described with reference to test examples. A belt with a 10 mm width x 35 mm length V-shaped zigzag finger joints and a width of 5 mm x 35 mm overlap at both ends of the main body belt in which a 0.2 mm thick cover layer made of polyurethane resin is laminated on one side of 1-ply polyester canvas. Formed two types of belt joints with overlapping overlap joints, and on the back side of the belt, V-shaped joint 3 shown in Fig. 6 (upper width 10m
m, the bottom width is 7.8 mm, the height is 3 mm, and the bottom part is provided with a circular arc-shaped vertical groove).
The belt joint shown in (1) has only the finger joint structure, and the other conditions are exactly the same as the above, and the belt 21 having the joint of the conventional belt is formed.

These belts are suspended on the drive pulley 31, the take-up pulley 33, the tail pulley 34 and the bend pulley 32 shown in FIG. 7, and the belt tension is 3.9 KN.
/ M, the belt speed was 150 m / min, and the number of flexures before the crack was generated in the belt joint was measured. The drive pulley 31 and the take-up pulley 3
3, the tail pulley 34 is a V-groove pulley, the bend pulley 32 is a flat pulley, and each pulley diameter is 25 mmφ.
Is. The test results are shown in Table 1.

[0017]

[Table 1]

As is clear from the results of this test, the joint structure of the present invention has a dynamic bending frequency of about 4.5 times or more as compared with the conventional joint structure, and the belt life is greatly improved. Was confirmed.

[0019]

As described above, the joint structure of the caulked belt for light transport according to the present invention is a composite joint structure in which the overlap joint of the V-shaped joint region and the finger joint other than the V-shaped joint region are combined. As a result, it is possible to improve the joint strength of the V-shaped cauldron region for preventing meandering where bending stress concentrates, prevent cracking of the finger part, and also to maintain flexibility by relaxing rigidity and to accommodate small pulley diameters. As a result, it is possible to achieve a great improvement in belt life with a small pulley diameter and a meandering prevention function.

[Brief description of drawings]

FIG. 1 is a rear view of a jointed belt joint according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG.

FIG. 4 is a view corresponding to FIG. 2 showing another embodiment of the jointed belt joint according to the present invention.

FIG. 5 is a view corresponding to FIG. 3, showing another embodiment of the jointed belt joint according to the present invention.

FIG. 6 is a perspective view showing an example of a V-shaped sleeve.

FIG. 7 is an explanatory diagram showing an outline of a running tester that tests the durability of a belt joint.

FIG. 8 is a view corresponding to FIG. 1 showing a conventional joint structure of a belt with a sleeve.

[Explanation of symbols]

 1 Belt with Conveyor Belt 2 Belt Main Body 3 V-Shape 4 Canvas Layer 5 Cover Layer 2A One Joint of the Remaining Region 2B The Other Joint of the Remaining Region 2A'V-Shape One Joint of the Region 2B'V-Shape The other joint part of the groove area Residual area excluding the MV groove area MV groove area part

Claims (2)

[Claims] 1. A V extending in the belt longitudinal direction on the front or back side of a belt body having at least one ply of canvas as a core layer, and a thermoplastic resin or rubber is laminated between the surface and each ply. Concentration of bending stress at the joints in the joint structure of the jointed belts in which both ends of the jointed belts having the joints are cut in zigzag shapes opposite to each other, and the zigzag ends are butted and fitted together. A joint structure for a belt with a joint, characterized in that the joint of the V-shaped joint region is an overlap joint, and the joint of the remaining region excluding the V-shaped region is a zigzag finger joint. 2. The overlap margin of the overlap joint is 10 to 10.
The joint structure for a belt with a joint according to claim 1, which is in a range of 50 mm.