JPS6026014Y2 - conveyor belt - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conveyor belt, and particularly to a conveyor belt that eliminates buckling phenomenon when the belt is bent and has excellent durability.

Conventionally, core fabrics have been used as reinforcing materials in conveyor belts.

A special fabric with no shrinkage is used for the structure of the core fabric.

Figures 1A to 1C are diagrams for explaining special weaving, with warp threads 1
(used in the longitudinal direction of the belt) and the weft threads 2 are simply placed perpendicular to each other and are not woven together as in normal textiles.

In addition to the warp yarns 1 and the weft yarns 2, a leno yarn 3 is entangled with the weft yarns as shown in FIG. 1C to form a cloth-like structure.

Therefore, the warp threads 1 and the weft threads 2 are substantially straight and in a so-called unwavy state, and this weaving method is referred to as a special weave in the present invention.

Conventionally, the materials used for special weaving have generally been single-twisted nylon threads for the warp threads, and nylon or vinylon threads for the weft threads and curly threads.

FIG. 2 shows the structure of the single-stranded yarn 4, in which a sliver is twisted relatively lightly in one direction to form a twisted yarn.

However, when nylon fibers are used for the warp threads, the warp threads (nylon fibers) tend to stretch due to the tensile force generated when the conveyor belt runs due to its small initial modulus, and as a result, the conveyor belt itself grows during the run (elastic elongation and permanent elongation). This had the drawback of requiring take-up adjustment and belt truncation.

To improve this problem, polyester fibers with high initial modulus (low elongation) have recently been used for the warp yarns, which have a large effect on the tensile strength of conveyor belts.

However, when using single-twist polyester fibers for the warp yarns, especially when inserting two or more layers of core fabric into a conveyor belt, buckling occurs when the conveyor belt is bent, and it remains in this state for a long time. When the conveyor belt runs, the strength of the core fabric on the pulley side significantly decreases.

This is because when a conveyor belt is bent in contact with a pulley, etc., there is a difference in the degree of elongation between the lower layer (the side in contact with the pulley) and the upper layer. Core fabrics do not buckle because the inner core fabric absorbs this difference in elongation, but with special woven core fabrics in which warp threads are linearly incorporated with polyester fibers with a large initial modulus, elongation does not occur. It is not possible to absorb the difference in the degree of the fabric, and the warp threads of the lower layer of fiber cloth are bent between the weft threads, resulting in a buckling phenomenon.

FIG. 3 is a diagram showing the buckling phenomenon of a conveyor belt. The conveyor belt consists of a two-layer special core fabric 8, a coat comb 6 covering this, and a top cover rubber 5 provided between these. There is.

When this conveyor belt is bent along a pulley (not shown), a portion of the warp yarn 1 of the special core fabric 8 is bent, and as a result, the port t and the cover rubber 7 are moved toward the pulley. stand out.

The occurrence of the buckling portion 9 in the warp yarn 1 in this manner is called buckling phenomenon.

If the belt is run for a long time in this state, the buckled portion of the warp threads will suffer from bending fatigue, and the remaining strength will drop significantly.

In general, in special woven core fabrics, the warp yarns bear most of the tensile strength of the warp yarns and binder yarns, and the purpose of the binder yarns is to entangle the weft yarns, so the warp yarns play a large role. Fatigue of the threads can lead to serious accidents such as belt breakage.

In order to eliminate buckling, a method generally used is to make the weft thicker and increase the density (number of wefts), but this increases cost and is less effective.

The present invention solves the drawbacks of the prior art as described above, and in a conveyor belt having two or more layers of core fabric, the core fabric is composed of the above-mentioned special weave, and the warp threads are This is a conveyor belt made of Moro-twisted polyester yarn.

The present invention will be explained in detail below.

FIG. 4 is a side view of the core fabric of the present invention. The weaving method is the same as the conventional special weaving, but polyester Moro twisted yarn 10 is used as the warp yarn.

FIG. 5 is a diagram illustrating the Moro twisted yarn 10, in which a plurality of first twisted yarns 11 (three in FIG. 5) are combined and further twisted to form one Moro twisted yarn 10. .

In this way, when polyester Moro twisted yarn is used as warp yarn, it exhibits stress deformation absorption that polyester cannot originally possess, and can be used for special woven core fabrics in the same way as conventional nylon single-twisted fibers. , which significantly improves the buckling phenomenon that occurs when the conveyor belt is bent, and significantly improves the remaining strength after long-term use.

As described above, the Moro twist structure consists of the first twist and the first twist, and the twist directions of the first twist and the first twist are opposite (when the first twist is S, the first twist is Z).

When referring to the number of twists of Moro twisted yarn, you can choose any number of twists for both the number of first twists and the number of first twists, and the formula % Formula % T: twist number 710 cm, ni: twist coefficient, D: denyl. It will be done.

In this invention, the twist coefficient of the first twist is 6.5 to 23.
．． 8. The twist coefficient of ply twisting should be between 9.2 and 30.6.
Preferably, the twist coefficient of the first twist is 8.7 to 19. A twist coefficient of 12.2 to 24.5 for upright twisting is practical;
Furthermore, considering economic efficiency, the twist coefficient of first twist = 10.8 ~
15.2, the twist coefficient of the first twist is preferably 15.3 to 21.4.

Furthermore, regarding the denier of the yarns that make up the Moro twist, generally the first twisted yarn is 100σ x 1 to 150σ x 1.
2 pieces, i.e. 1000″l/112~1500″/3/4
A Moro twist structure of 100 (7
'I/1/2 to 1500''/2/3 are used.

In addition, in the case of a conveyor belt that has a special woven reinforcing fiber cloth using nylon fibers with a Moro-twisted structure in the warp threads,
The residual strength after long-term use is dramatically improved compared to a structure using a single-twist structure for the warp yarn, but on the other hand, the growth (elastic elongation and permanent elongation) during belt running increases significantly, which not only deteriorates belt performance. This is not economical as it causes loss of strength in the warp threads.

The conveyor belt of the present invention has the following advantages.

(1) Compared to the prior art, the buckling phenomenon of the belt is significantly reduced, so the pulley diameter can be reduced.

Therefore, it is possible to downsize the conveyor belt itself.

(2) The fatigue resistance of the warp yarn itself is significantly improved.

For this reason, conveyor belts that have two or more layers of a special woven core fabric featuring Moro-twisted polyester fibers are susceptible to failure, similar to conveyor belts that have two or more layers of core fabrics that have warp threads such as single-twist nylon fibers. It is possible to obtain an excellent conveyor belt that has excellent bending fatigue resistance and small growth.

The present invention will be specifically explained below with reference to Examples.

Example 1 A special fabric with the structure shown in Table 1 was made, and the coating thickness was 1.3.
A belt conveyor having a cross section as shown in FIG. 6 with an upper cover thickness of 4 m and a lower cover thickness of 2 mm was fabricated, and buckling and running tests were conducted to obtain the results shown in Table 1.

Example 2 The special fabric shown in Table 2 was used as the core, the coating thickness was 1.2 m,
A belt with an upper cover thickness of 3 rrvn and a lower cover thickness of 2 mm was made and tested in the same manner as in Example 1, and the results shown in Table 2 were obtained.

From the results in Tables 1 and 2, it can be seen that the product of the present invention is less prone to buckling and suffers less bending fatigue than Comparative Example 1.2 in which single-twisted polyester yarn was used as the warp yarn.

Example 3 The special fabric shown in Table 3 was used as the core, and the coating thickness was 1.2 mm.
A belt having an upper cover thickness of 4TrrIn1 and a lower cover thickness of 2rran was made, and the same tests as in Example 1 were conducted to obtain the results shown in Table 3.

Example 4 The special fabric shown in Table 4 was used as the core, and the coating thickness was 1.377.
1771. A belt with an upper cover thickness of 4 mm and a lower cover thickness of 2 mm was made, and the same tests as in Example 1 were conducted, and the results shown in Table 4 were obtained.

From the results in Tables 3 and 4, it can be seen that the product of the present invention is the only one that has a small occurrence of buckling, no bending fatigue, and a small elongation under normal load, that is, a small growth of the belt.

In other words, those using single-stranded polyester yarn as the warp yarn have low elongation under normal load, but buckling and bending fatigue are large, and those using single-stranded nylon yarn as the warp yarn cause buckling and bending.
Although flexural fatigue is favorable, the normal load elongation is large, indicating that the belt will grow.

[Brief explanation of the drawing]

FIG. 1 is an organizational chart of the special fabric, with FIG. 1A being a plan view, FIG. 1B being a front view, and FIG. 1C being a side view. Figure 2 is a perspective view of one-sided twisted yarn, Figure 3 is a cross-sectional view of a bent conveyor belt, Figure 4 is a side view of a special woven structure using Moro twisted yarn, and Figure 5 is a perspective view of Moro twisted yarn. , FIG. 6 is a cross-sectional view of the conveyor belt. 1...Warp thread, 2...Weft thread, 3...
...Tangled thread, 4...Single twisted thread, 8...Special woven core, 9...Frustration part, 10...Moro twisted thread.

Claims (1)

[Scope of utility model registration request] In a conveyor belt having two or more layers of core fabric,
The core fabric has a structure in which warp yarns and weft yarns are substantially straight, and these are entwined with leno yarns, and the warp yarns are made of Moro-twisted polyester yarn. A conveyor belt featuring: