JP2000018336A - Joining structure of belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength and durability of a belt joining part more than the conventional structure in which the length of a steel cord is arranged in a short order or long order orderly without changing the processing and structure relating to the cost increase. SOLUTION: The number of step as well as the number of one unit reinforcement cord 2 extended from the terminal 1a of one side of a belt 1 are made to N and also the length of N pieces reinforcement cords 2 is differed mutually at every step length divided in response to the number of step N and out of plural combination mutually differed the line up way of the reinforcement cord 2 with a different length, the sum (ΣDL) of the length (DL) of the anti-load block (slant line part) which is mutually adjoining part of the reinforcement cords 2, 2' extended from mutually reverse direction is combined to nearly 50% or more of the sum of the entire block length formed between adjacent reinforcement cords regardless of normal/reverse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt joining structure such as a conveyor belt in which a plurality of reinforcing cords such as steel cords are disposed.

[0002]

2. Description of the Related Art A conveyor belt used for a belt conveyor is used by joining one or a plurality of flat belts at their ends to each other and wrapping them along a number of rollers mounted on a frame. .

[0003] As shown in Figs. 4 and 5, for example, as shown in Figs. Steel cords, which are a plurality of reinforcing cords of different types (from the shortest one, (2-1) (2'-1) (2-2) (2'-2) (2-3) (2'-3 ) (2-
4) (2'-4) is attached, and they are divided into right and left parts and integrated to obtain (2) (2 '). ), And the longest steel cords (2-4) (2'-4) alone and those below are the total length (L) of the joint, which is the dimension between the ends (1a) (1a '). ) Are abutted at the boundaries of a plurality of steps evenly divided according to a predetermined number of steps (here, 4), and are arranged side by side at equal intervals (3) to form a parallel line. There is a method in which the rubber (4) is sandwiched between 3) and then re-vulcanized and joined.

In this type of belt joining structure, conventionally, a steel cord (2-1) (2-2) (2-3) (2--3) extending from an end (1a) of one belt (1) is used. 4), the steel cord (2 extending from the end (1a ') of the right belt (1') in FIG. ')).

[0005]

In the above-described conveyor belt, the strength and durability of the belt depend on the structure of the joining portion, and it is necessary to improve the strength and durability of the joining portion. The overall strength and durability will be improved.

As conventional means for improving the strength and durability of such a joint, there are known means such as increasing the total length (L) of the joint and increasing the number of steps. In practice, the use of a combination of these measures under these constraints will increase the cost of the intended joint. The reality is that strength and durability are obtained.

Conventionally, as described above, a steel cord (2-1) extending from a terminal (1a) of one belt (1) is used.
(2-2) It is thought that the largest joint strength can be obtained by arranging (2-3) and (2-4) in order from short to long (or long to long) so that the length differs by one step. However, according to the applicant's research, this was incorrect, and in order to obtain high joint strength, the part where the steel cords extending from opposite directions overlap each other between rows of adjacent steel cords That is, it has been found that it is most important that the sum of the lengths of the load-bearing blocks is large.

[0008] The present invention has been made based on such a finding, and an object of the present invention is to provide a steel cord as described above without performing any processing or structural change that leads to an increase in cost. It is an object of the present invention to provide a joining structure of a belt in which the strength and durability of the joining portion of the belt can be increased as compared with a conventional belt which is arranged in order of a shorter length or a longer length.

[0009]

According to the present invention, the above-mentioned problem is solved as follows. (1) Extend a plurality of reinforcing cords having different lengths from the ends of the belts facing each other, and connect the reinforcing cords extending from both ends to each other with the longest reinforcing cord alone.
The lower ones are abutted at the boundary part where the total length of the joining part is divided according to the predetermined number of steps, and are arranged side by side with side-by-side, and vulcanized by being sandwiched in the space, In a belt joining structure in which adjacent reinforcing cords are joined together, the number of steps and the number of one-unit reinforcing cords extending from one end of the belt are both N, and the N reinforcing cords are used. Are different from each other by the length of the steps divided according to the number of steps N, and among a plurality of combinations in which the arrangement of the reinforcing cords having different lengths is different from each other, the lengths are extended from opposite directions. The sum (ΣDL) of the lengths (DL) of the load-bearing blocks, which are the adjacent parts of the reinforcing cords that have come out, is equal to the total blow-up formed between adjacent reinforcing cords regardless of the order. A combination is from approximately 50% more than the sum of the length of the click.

(2) In the above item (1), the number of steps and the number of reinforcing cords of one unit extending from one end of the belt are both 4 and the total number of blocks divided for each step is 20. In contrast, the combination is such that the number of load-bearing blocks is 10 or more.

[0011]

1 and 2 show an embodiment of the present invention. The same components as those of the conventional one shown in FIGS. 4 and 5 are denoted by the same reference numerals.

In the present embodiment, the belts (1) (1 ') facing each other have different lengths from the terminals (1a) (1a').
Steel cord, which is a reinforcing cord for each book ((2-1) (2'-1) (2-2) (2'-2) (2-3) (2'-3) (2-
4) (2'-4) is attached, and they are divided into right and left parts and integrated to obtain (2) (2 '). ), And the longest steel cords (2-4) (2'-4) alone and those below are the total length (L ) Are abutted at the boundaries of a plurality of steps evenly divided according to a predetermined number of steps (here, 4), and are arranged side by side at equal intervals (3) to form a parallel line. The rubber (4) is sandwiched between 3) and re-vulcanized to join. The arrangement shown in FIG. 1 is one unit, and the same arrangement is continued vertically in FIG.
It can be a wide belt.

The above-described structure is the same as the conventional structure shown in FIG. 4, but in this embodiment, between the steel cord rows adjacent to each other, the steel cords extending from opposite directions are adjacent to each other. The sum (ΣDL) of the length (DL) of the load-bearing block (shown as hatched in FIG. 1)
Is the largest (12 when counted by the number of steps).

That is, the terminal of the left belt (1) in FIG.
Replace the steel cord (2) extending from (1a) with (2-2) (2-4)
(2-1) In the order of (2-3), and the terminal (1) on the right belt (1 ')
a ') to extend the steel cord (2'), (2'-3) (2'-1)
They are arranged in the order of (2'-4) and (2'-2).

In FIG. 1, the uppermost hatched portion is the uppermost steel cord (2-2) extending from the left side, and the longest steel cord extending from the right side (not shown) above it. And a polymerized portion of By including the uppermost hatched portion, a complete 単 位 DL for one unit can be obtained. In this example, the total number of blocks divided for each step formed between adjacent steel codes regardless of the order is 4 steps × 5 columns of steel codes = 20.

With such a combination,
By maximizing the sum (ΣDL) of the lengths (DL) of the load-bearing blocks, the strength and durability of the joint portion of the belt can be increased.

FIG. 3 shows the number of steps and one belt.
One unit of steel cord extending from the terminal (1a) of (1)
All combinations of (2) in which the number of lines is N = 4 and the length of each step is the same are shown (excluding the reverse order).

The upper four numbers indicate the length of one unit of four steel cords extending from the terminal (1a) of the left belt (1), from 1 to 4 in order from the upper one. It is shown with numbers (larger numbers are longer),
The number on the right is the sum (ΣΔL) of the difference in length (ΔL) between adjacent steel cords extending from the terminal (1a) of the left belt (1) when the combination is used, and The numbers in parentheses indicate the number of load-bearing blocks (shown by oblique lines in FIG. 3). In each of (a) to (m), the total number of blocks is 4 × step number of steel code columns = 20, as in the case of FIG.

In FIG. 3, (a) corresponds to the combination of the conventional configuration shown in FIG. 4, and (j) corresponds to the combination of the configuration shown in FIG.

For each combination of (a) to (m) shown in FIG. 3, the maximum shear stress (τm
ax) was obtained, and in the combination of (a) (b) (d) (f) with ΣDL = 8, the value of τmax was large in many cases, whereas the combination of ΣDL = 10 with (c) ( In the combination of e) (g) (h) and the combination of (i) (j) (k) (m) with ΣDL = 12, τmax shows a small value, and particularly, τmax is the same as that shown in FIG. In the combination of (j), τmax shows a remarkably low value.

Therefore, by using a combination in which ΔDL is 10 or more, that is, 50% or more of the total number of blocks (20), τmax can be suppressed to a low value, and the strength and durability of the joint portion of the belt can be reduced. Can be maintained sufficiently.

In the above description, the number of steps and the number of one unit of steel cord extending from one end of the belt are both N = 4.
Alternatively, the present invention can be applied to a case where N = 5 or more.

The number of steps and the number of one unit of steel cord extending from one end of the belt are both N = 3.
In this case, 1234 in the upper part of FIGS.
And so on, the same display method as that of
3, 132, and 213. Of the combinations of 123 arranged in order from the shortest as in the past, ΔDL = 6 (the total number of blocks is N (N
+1) = 12), 132, ΣDL = 6,
In the combination of 213, ΣDL = 8. In this case, it is preferable to set 213 in which ΣDL = 8.

The number of steps and the number of one unit of steel cord extending from one end of the belt are both N = 5.
, There are 60 combinations and the total number of blocks is
N (N + 1) = 30, and the total number of load-bearing blocks (ΣD
L) is distributed in the range of 10 to 18, of which ΔDL
However, it is preferable to select a combination of 15 or more, which is 50% of the total number of blocks 30.

[0025]

According to the first and second aspects of the present invention,
A conventional one in which reinforcement cords are arranged neatly in ascending or descending order only by changing the simple configuration of the arrangement of reinforcing cords of different lengths extending from the end of the belt. Thereby, the strength and durability of the joining portion of the belt can be increased. Therefore, it is not necessary to lengthen the total length of the joining portion, increase the number of steps, or significantly change the structure or add reinforcing means, which leads to an increase in cost.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a diagram schematically showing all combinations in which the number of steps is 4, and the number of steel cords extending from the end of one belt and having different lengths is 4;

FIG. 4 is a plan view schematically showing a joining portion of a conventional belt.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

[Explanation of symbols]

(1) (1 ') belt (1a) (1a') terminal (2) (2 ') (2-1) (2'-1) (2-2) (2'-2) (2-3) (2'-3) (2-4) (2 '
-4) Steel cord (3) Spacing (4) Rubber

Claims (2)

[Claims] 1. A plurality of reinforcing cords having different lengths from ends of belts facing each other are extended, and the reinforcing cords extending from both ends are separated by the longest reinforcing cord alone. The following are abutted at the boundary portion where the total length of the joining portion is divided according to the predetermined number of steps, and are juxtaposed with a gap provided on the side, and vulcanized by being sandwiched within the gap, and adjacent to each other. The number of steps and the length of the belt extending from one end of one side of the belt.
While the number of reinforcement cords in each unit is N,
Making the lengths of the N reinforcing cords different from each other by the length of the steps divided according to the number of steps N,
Sum of lengths (DL) of load-bearing blocks, which are portions where reinforcing cords extending from opposite directions are adjacent to each other among a plurality of combinations in which reinforcing cords having different lengths are arranged in different ways. A belt joining structure, wherein (ΣDL) is a combination that is approximately 50% or more of the total length of all blocks formed between adjacent reinforcing cords regardless of order. 2. The number of steps and the number of reinforcing cords of one unit extending from one end of the belt are both set to 4,
The belt joining structure according to claim 1, wherein the total number of blocks divided for each step is 20, while the number of load-bearing blocks is 10 or more.