WO2018185965A1

WO2018185965A1 - Conveyor belt

Info

Publication number: WO2018185965A1
Application number: PCT/JP2017/040774
Authority: WO
Inventors: 純宮島
Original assignee: 横浜ゴム株式会社
Priority date: 2017-04-04
Filing date: 2017-11-13
Publication date: 2018-10-11
Also published as: JP6866733B2; CN110506015B; CN110506015A; JP2018177391A

Abstract

The present invention minimizes damage caused by heat, reduces costs, and improves durability. This conveyor belt 10 is configured to include a core reinforcement layer 12, edge rubber layers 14, an upper surface cover rubber layer 16, a lower surface cover rubber layer 18, and a foamable material 20. The edge rubber layers 14 are arranged on both sides of the core reinforcement layer 12 in the width direction. The foamable material 20 is embedded so as to extend continuously in a linear state along the lengthwise direction of the edge rubber layers 14 at a location in the center of the edge rubber layers 14 in the thickness direction and toward the exterior in the width direction. The foamable material 20 foams when heated to a temperature equal to or greater than a predetermined temperature and exhibits thermal insulation properties and fire resistance when foamed and expanded in volume.

Description

Conveyor belt

The present invention relates to a conveyor belt.

2. Description of the Related Art Belt conveyor devices are widely used for transporting transported objects such as coal, ore and earth and sand in mines, quarries, civil engineering construction sites, and the like.
The belt conveyor device includes a long frame, a conveyor belt stretched across both ends of the frame in the longitudinal direction, a plurality of guide rollers that support the conveyor belt, and a drive unit that runs the conveyor belt. Has been.
And the guide provided in the flame | frame is extended along the extension direction of a conveyor belt on both sides of the conveyance surface of a conveyor belt.
In such a belt conveyor device, the object to be conveyed is stacked at a position deviated from the center in the width direction of the conveyor belt, so that the running conveyor belt meanders.
When the conveyor belt meanders, the edge of the conveyor belt keeps in contact with the surrounding structure and a specific part of the guide of the frame for a long time, and the structure and the part of the guide contacted with the edge of the conveyor belt become hot due to frictional heat. Become.
If the conveyor belt stops running when the structure or guide is hot, the edge of the conveyor belt will come into contact with the hot part of the structure or guide, The edge temperature rises.
And heat may be transmitted to the conveyor belt from the edge portion in contact with the high temperature portion of the structure or guide, and the conveyor belt may be damaged by the heat.
In order to prevent damage to the conveyor belt due to such heat, a structure in which the entire conveyor belt is configured using a rubber composition having flame retardancy is provided (see Patent Document 1).

JP 2014-118459 A

However, a conveyor belt using a flame retardant rubber composition has the effect of suppressing heat damage, but tends to increase the material cost and is not high in wear resistance, ensuring durability. There is a disadvantage in doing.
The present invention has been made in view of such circumstances, and an object thereof is to provide a conveyor belt that is advantageous in reducing cost and improving durability while suppressing damage due to heat.

In order to achieve the above-mentioned object, according to the present invention, a foamable material foamed by receiving heat is embedded along the longitudinal direction of the conveyor belt at locations near both ends in the width direction of the conveyor belt. Features.

According to the present invention, when the edge of the stopped conveyor belt is brought into contact with the high temperature portion of the structure or guide, when it stops, the high temperature portion of the structure or guide extends from the high temperature portion of the conveyor belt to the end of the conveyor belt in the width direction. Heat is transferred.
When this heat is transferred to the foamable material and the foamable material exceeds the foaming temperature, the foamable material foams and the volume expands, and the foam is expanded by the expansion pressure of the foamable material. It breaks through the part and blows out to the outside of the conveyor belt.
Then, the foam with increased volume enters widely between the edge of the conveyor belt and the hot structure or guide, and the edge of the conveyor belt against the hot structure or guide. It is advantageous in insulating the part and suppressing the wide range of the conveyor belt from being damaged by heat.
In addition, by visually observing the bubbles ejected to the outside of the conveyor belt, workers can instantly determine that an abnormal situation has occurred in which the edge of the conveyor belt has overheated, making it easy to accurately report the abnormality of the conveyor belt. It is advantageous in carrying out.
In addition, the worker visually recognizes the bubbles ejected to the edge of the conveyor belt, which is advantageous in easily finding the cause of the abnormality and taking quick measures.
In addition, compared to the conventional case where a conveyor belt is formed using a rubber composition having flame retardancy, a rubber composition that is inexpensive and excellent in durability can be used. This is advantageous in reducing costs and improving durability.

(A) is sectional drawing which fractured | ruptured the conveyor belt of embodiment in the surface parallel to the width direction, (B) is a top view of a conveyor belt, and shows the state by which the foamable material was embed | buried under the ear rubber layer. . (A) is sectional drawing which fractured | ruptured the conveyor belt of embodiment in the surface parallel to the width direction, (B) is a top view of a conveyor belt, the foam of a foamable material ejects to the exterior of a conveyor belt Indicates a spread state. (A) is sectional drawing which fractured | ruptured the conveyor belt which concerns on the modification in the surface parallel to the width direction, (B) is a top view of a conveyor belt, and shows the state by which the foamable material was embed | buried under the ear rubber layer. . (A) is sectional drawing which fractured | ruptured the conveyor belt which concerns on the modification in the surface parallel to the width direction, (B) is a top view of a conveyor belt, and the bubble of a foamable material ejects to the exterior of a conveyor belt Indicates a spread state. (A) is sectional drawing which fractured | ruptured the conveyor belt which concerns on the modification in the surface parallel to the width direction, (B) is a top view of a conveyor belt, and shows the state by which the foamable material was embed | buried under the ear rubber layer. . (A) is sectional drawing which fractured | ruptured the conveyor belt which concerns on the modification in the surface parallel to the width direction, (B) is a top view of a conveyor belt, and the bubble of a foamable material ejects to the exterior of a conveyor belt Indicates a spread state.

Hereinafter, a conveyor belt according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1A and 1B, the conveyor belt 10 includes a core reinforcing layer 12, an ear rubber layer 14, an upper cover rubber layer 16, a lower cover rubber layer 18, and a foamable material 20. It is comprised including.
The core body reinforcing layer 12 includes a plurality of core materials 1202 and a coat rubber 1204 that covers the core materials 1202.
The core reinforcing layer 12 is a part that supports the tensile load applied to the conveyor belt 10 and maintains the tension of the conveyor belt 10.
The ear rubber layer 14 is disposed on both sides in the width direction of the core body reinforcing layer 12.
The ear rubber layer 14 is a portion that protects both sides in the width direction of the conveyor belt 10 including the core body reinforcing layer 12.
The upper cover rubber layer 16 and the lower cover rubber layer 18 cover and sandwich the core reinforcing layer 12 and the ear rubber layer 14.
The upper surface cover rubber layer 16 is a portion on which an object to be conveyed is stacked and conveys the object to be conveyed, and the lower surface cover rubber layer 18 is a portion in contact with a plurality of rollers that support the conveyor belt 10.
The core reinforcing layer 12, the ear rubber layer 14, the upper cover rubber layer 16, and the lower cover rubber layer 18 each extend with a certain width to constitute the conveyor belt 10.

The foamable material 20 is continuously embedded in a straight line along the longitudinal direction of the ear rubber layer 14 at a position near the outer side in the width direction at the center in the thickness direction of the ear rubber layer 14. .
Although FIG. 1A shows a case where the cross-sectional shape of the foamable material 20 is circular, the cross-sectional shape of the foamable material 20 includes various conventionally known cross-sectional shapes such as an ellipse, a triangle, a rectangle, and a polygon. It can be adopted.
Embedding of the foamable material 20 in the ear rubber layer 14 is performed in a step before the ear rubber layer 14 is vulcanized, that is, in a step before the conveyor belt 10 is vulcanized.
The foamable material 20 is foamed by being heated to a predetermined temperature or higher, and exhibits heat insulation and fire resistance in a state where the foam is expanded and its volume is expanded.
As the foamable material 20, various conventionally known materials such as a carbon graphite foam material and a sodium silicate foam material can be used.

Examples of commercially available foamable materials 20 that can be used include Sekisui Chemical Co., Ltd. trade name “Fibloc” and Austrian Chemilinz trade name “Intsumex”.
For example, “Fibro” foams by heating at 200 ° C. or higher and expands in volume by 5 to 50 times, and the temperature at which foaming can be adjusted.
Therefore, after embedding the foamable material 20 in the ear rubber layer 14, even if the conveyor belt 10 is heated in the vulcanization process of the conveyor belt 10, the vulcanization temperature is about 150 ° C., and the foamable material 20 is foamed. Therefore, the foamable material 20 does not foam during vulcanization.

Further, “Fibro” and “Intmex” are solids having flexibility at the temperature under the environment where the belt conveyor device is installed. In other words, at the temperature under the environment where the conveyor belt 10 is used, It is a solid with flexibility.
For this reason, the foamable material 20 is smoothly curved and deformed together with the ear rubber layer 14 at, for example, at least the upstream end and the downstream end in the transport direction of the transport object at the location where the transport direction of the transport object is changed. This is advantageous in smoothly running the belt 10.
The foamable material 20 is preferably foamed with a color that stands out from the color of the surface of the conveyor belt 10 in order to make the foamed foam easily visible.
For example, the foamable material 20 is preferably foamed in a color that is complementary to the color of the surface of the conveyor belt 10 in order to make the foamed foam visible.
Alternatively, when the color of the surface of the conveyor belt 10 is black, it is preferable that the foamable material 20 foams in white in order to make it easy to visually recognize the foamed foam.

Next, the function and effect will be described.
If the conveyor belt 10 meanders while running in the belt conveyor apparatus, and the edge of the conveyor belt 10 continues to contact the surrounding structure or the frame guide of the belt conveyor apparatus, the structure or the guide will be removed. High temperature locally due to frictional heat.
In this state, when the conveyor belt 10 stops traveling and stops at a position where the edge of the stopped conveyor belt 10 is in contact with a location where the structure or guide is hot, the conveyor belt 10 starts from the high temperature portion of the structure or guide. Heat is transferred to the widthwise ends of the top cover rubber layer 16, the ear rubber layer 14, and the bottom cover rubber layer 18 in the width direction, which constitute the edge of 10.
And if it is transmitted to the foamable material 20 embedded in the ear rubber layer 14 and exceeds the temperature at which the foamable material 20 foams, the foamable material 20 foams and the volume expands.
Then, as shown in FIGS. 2 (A) and 2 (B), for example, the foam breaks through the outer portion in the width direction of the ear rubber layer 14 due to the expansion pressure of the foamable material 20 and is ejected to the outside of the conveyor belt 10. spread.
Then, the foam having an increased volume enters widely between the edge of the conveyor belt 10 and the high temperature structure or guide portion, and the conveyor belt 10 reaches the high temperature structure or guide portion. Insulate the edges.

Therefore, heat is continuously transmitted to the conveyor belt 10 from the edge portion in contact with the structure or guide that has become high temperature, which is advantageous in suppressing the wide range of the conveyor belt 10 from being damaged by heat. It becomes.
Further, by visually observing the bubbles ejected outside the edge of the conveyor belt 10, an operator can instantly determine that an abnormal situation has occurred in which the edge of the conveyor belt 10 is overheated. This is advantageous in accurately and easily performing the notification.
In addition, the operator can quickly identify the location of the structure or guide that is in contact with the conveyor belt 10 by visually recognizing the bubbles ejected to the edge of the conveyor belt 10, so that the cause of the abnormality can be easily determined. It is advantageous in ascertaining and taking quick measures.
Moreover, compared with the case where the conveyor belt 10 is comprised using the rubber composition which has a flame retardance conventionally, the thing which was cheap and excellent in durability as a rubber composition which comprises the conveyor belt 10 should be used. This is advantageous in reducing the cost and improving the durability.

Further, when the foamable material 20 is foamed in a color complementary to the color of the surface of the conveyor belt 10, it is easy for an operator to visually recognize the foamed foam, and to accurately report abnormality of the conveyor belt 10. More advantageous.
Alternatively, when the color of the surface of the conveyor belt 10 is black, if the foamable material 20 is foamed in white, it is easier for an operator to visually recognize the foamed foam, which is more advantageous for accurately reporting abnormality of the conveyor belt 10. It becomes.

Moreover, the repair of the part which the foamable foaming material 20 has penetrated the edge part among the conveyor belts 10 can be performed in the following procedures.
The entire length in the longitudinal direction and the width direction of the conveyor belt 10 corresponding to the edge portion through which the foamable foamable material 20 is broken is cut out from the remaining conveyor belt 10.
A new conveyor belt 10 having the same length and width as the cut conveyor belt 10 is prepared. In this conveyor belt 10, as in the embodiment, the foamable material 20 is embedded in the ear rubber layer 14 along the longitudinal direction of the conveyor belt 10.
The both ends of a new conveyor belt 10 are joined to both ends in the longitudinal direction of the remaining conveyor belt 10.
In this case, since the damaged edge can be easily identified by the location where the foamable material 20 is foamed, the excision work of the damaged conveyor belt 10 can be easily performed. This is advantageous for improving the efficiency of repair work.

Next, a modification will be described with reference to FIGS.
In the following description of the modified examples, the same portions and members as those in the above-described embodiment are denoted by the same reference numerals, the description thereof is omitted, and different portions are mainly described.
As shown in FIG. 3A, in this modification, the foamable material 20 is placed at the center of the upper surface cover rubber layer 16 and the lower surface cover rubber layer 18 in the thickness direction and on the outer side in the width direction. The rubber layer 16 and the bottom cover rubber layer 18 are embedded so as to extend continuously in a straight line along the longitudinal direction.
As in the above-described embodiment, embedding of the foamable material 20 in the upper cover rubber layer 16 and the lower cover rubber layer 18 is performed in a step before the conveyor belt 10 is vulcanized.

In this modification, when heat is transferred to the foamable material 20 and the temperature at which the foamable material 20 foams is exceeded, the foamable material 20 foams and the volume expands.
Then, as shown in FIGS. 4 (A) and 4 (B), the foam breaks through, for example, the outer portions in the width direction of the upper cover rubber layer 16 and the lower cover rubber layer 18 due to the expansion pressure of the foamable material 20, and the conveyor belt. 10 squirts outside and spreads.
Then, the foam having an increased volume enters widely between the edge of the conveyor belt 10 and the high temperature structure or guide portion, and the conveyor belt 10 reaches the high temperature structure or guide portion. Insulate the edges.
Even with such a modification, the same effect as the above-described embodiment can be obtained.
The foamable material 20 may be provided in at least one of the ear rubber layer 14, the upper cover rubber layer 16, and the lower cover rubber layer 18. Of course, the foamable material 20 may be provided in all the three layers.

Next, a modified example will be described with reference to FIGS.
As shown in FIG. 5A, the conveyor belt 10 </ b> B of this modification does not include the ear rubber layer 14, and the foamable material 20 is outside in the width direction at the center in the thickness direction of the core body reinforcing layer 12. It is embedded and extended in a straight line continuously along the longitudinal direction of the core body reinforcing layer 12 at a position close to it.
As in the above-described embodiment, embedding of the foamable material 20 in the core reinforcing layer 12 is performed in a step before the conveyor belt 10 is vulcanized.

In this modification, when heat is transferred to the foamable material 20 and the temperature at which the foamable material 20 foams is exceeded, the foamable material 20 foams and the volume expands.
Then, as shown in FIGS. 6 (A) and 6 (B), for example, the foam breaks through the outer portion in the width direction of the core reinforcing layer 12 due to the expansion pressure of the foamable material 20 and is ejected to the outside of the conveyor belt 10. Spread.
Then, the foam having an increased volume enters widely between the edge of the conveyor belt 10 and the high temperature structure or guide portion, and the conveyor belt 10 reaches the high temperature structure or guide portion. Insulate the edges.
Even with such a modification, the same effect as the above-described embodiment can be obtained.
The foamable material 20 may be provided in at least one of the core reinforcing layer 12, the upper cover rubber layer 16, and the lower cover rubber layer 18, and of course, it may be provided in all of these three layers.

In addition, although the foamable material 20 may be provided at intervals along the longitudinal direction of the conveyor belt 10, the foamable material 20 extends along the longitudinal direction of the conveyor belt 10 as in the present embodiment. If it extends continuously in a linear shape, the foamable material 20 can be reliably foamed from the edge portion of the conveyor belt 10 that comes in contact with the structure or frame that has become hot. This is more advantageous for reliably insulating the edge of the conveyor belt 10 from the structure or frame.
Further, when the foamable material 20 is liquid or liquid at the temperature under the environment where the belt conveyor device is installed, the flexible material is filled with the foamable material 20 and the tube is embedded in the conveyor belt 10. It may be.

DESCRIPTION OF SYMBOLS 10 Conveyor belt 12 Core body reinforcement layer 14 Ear rubber layer 16 Upper surface cover rubber layer 18 Lower surface cover rubber layer 20 Foamable material

Claims

A foamable material that foams by receiving heat is embedded along the longitudinal direction of the conveyor belt at locations near both ends in the width direction of the conveyor belt.
Conveyor belt characterized by that.
The conveyor belt includes a core reinforcing layer, a lower cover rubber layer and an upper cover rubber layer sandwiching the core reinforcing layer,
The foamable material is provided in at least one of a core reinforcing layer, the lower cover rubber layer, and the upper cover rubber layer.
The conveyor belt according to claim 1.
The conveyor belt includes a core reinforcing layer, ear rubber layers disposed on both sides in the width direction of the core reinforcing layer, a lower cover rubber layer and an upper cover rubber that sandwich the core reinforcing layer and the ear rubber layer. With layers,
The foamable material is provided in at least one of the core reinforcing layer, the lower cover rubber layer, the upper cover rubber layer, and the ear rubber layer.
The conveyor belt according to claim 1.
The foamable material foams in a color that is complementary to the color of the surface of the conveyor belt.
The conveyor belt according to any one of claims 1 to 3, wherein:
The foamable material foams white,
The conveyor belt according to any one of claims 1 to 3, wherein:
The foamable material is a solid having flexibility at the temperature in the environment in which the belt conveyor is used.
The conveyor belt according to any one of claims 1 to 5, wherein: