KR102315019B1 - Conveyor belt for improved visual recognizability - Google Patents

Abstract

A conveyor belt is provided. According to an embodiment of the present invention, a conveyor belt with improved visibility for the safety of workers comprises: an upper cover layer; a core layer disposed under the upper cover layer; a lower cover layer disposed under the core layer; and a visibility member provided at an end of the conveyor belt in a width direction. The visibility member may have a color different from that of at least one of the upper cover layer and the lower cover layer.

Description

Conveyor belt with improved visibility {CONVEYOR BELT FOR IMPROVED VISUAL RECOGNIZABILITY}

The present invention relates to a conveyor belt having improved visibility, and to a conveyor belt having improved visibility so that a worker working in a dark environment can easily recognize it.

The conveyor belt is driven using a motor and a speed reducer, and the belt is sandwiched between the drive pulley and the tail pulley to rotate and transport the goods.

However, since the conventional conveyor belt is manufactured in black on both upper and lower surfaces and sides, a worker working in a dark environment often does not recognize the conveyor belt being driven, leading to an accident.

In order to solve this problem, a conveyor belt having a colored layer on the upper surface or a colored layer on the lower part of the upper cover has been developed, but workers approaching the side of the conveyor belt are still insufficient to recognize the conveyor belt being driven. There was a problem.

In addition, since the colored rubber has very poor adhesion with the black rubber, the conventional conveyor belt including the colored layer is separated from the colored layer during the operation of the conveyor belt and the belt is damaged, causing serious damage to the conveyor belt system. There was a problem that not only caused mechanical damage, damage to the package, and pollution of the surrounding environment due to the falling of the package, but also casualties of workers working nearby.

Therefore, it is urgent to develop a conveyor belt with improved physical properties while being able to easily recognize the operation of the conveyor belt by the operator.

The present invention is to solve the above problems, the operator easily recognizes the conveyor belt being driven even in a noisy working environment or in a dark working environment, the rubber properties are greatly improved compared to the conventional colored belt, and the visibility is improved. would like to provide

One embodiment of the present invention, in order to solve the above problems, in the conveyor belt visibility is improved for the safety of workers, the upper cover layer; a core layer disposed under the upper cover layer; a lower cover layer disposed under the core layer; and a visibility member disposed on the outermost surface in the width direction of the conveyor belt in the height direction of the conveyor belt, wherein the visibility member is different from the color of at least one of the upper cover layer and the lower cover layer A conveyor belt having a color is provided.

In the conveyor belt with improved visibility according to an embodiment of the present invention, a visibility member capable of recognizing the conveyor belt even in a noisy or dark working environment is formed, thereby greatly improving the safety of the operator.

In addition, the conveyor belt with improved visibility according to an embodiment of the present invention can significantly improve adhesion with other rubber layers compared to the conventional colored belt even though it is manufactured from a colored rubber composition.

In addition, the conveyor belt with improved visibility according to an embodiment of the present invention can improve physical properties such as tensile strength even including a visibility member manufactured from a colored rubber composition.

1 shows a conveyor belt according to an embodiment of the present invention, and FIG. 2 shows a cross-section taken along AA in FIG. 1 .
3 shows a conveyor belt according to an embodiment of the present invention, and FIG. 4 shows a cross-section taken along AA in FIG. 3 .
5 shows a conveyor belt according to another embodiment of the present invention, and FIG. 6 shows a cross-section taken along AA in FIG. 5 .
7 shows a conveyor belt according to another embodiment of the present invention, and FIG. 8 shows a cross-section taken along AA in FIG. 7 .

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only this embodiment allows the disclosure of the present invention to be complete and provides those of ordinary skill in the art the content of the present invention. It is provided for more complete information.

When an element is referred to as being positioned 'above' or 'below' another element in this specification, it means that the element is positioned directly 'above' or 'below' another element, or an additional element is placed between those elements. It includes all meanings that can be interposed. In this specification, the terms 'upper' or 'lower' are relative concepts set from the viewpoint of the observer. may mean

The same reference numerals in the plurality of drawings refer to elements that are substantially the same as each other. In addition, terms such as 'comprise' or 'have' are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, and includes one or more other features, number, or step. , it should be understood that it does not preclude the possibility of the existence or addition of , operation, components, parts, or combinations thereof.

In addition, the width direction referred to in the present invention may refer to the x-axis direction, the length direction may refer to the y-axis direction, and the height direction may refer to the z-axis direction.

In order to solve the above problems, an embodiment of the present invention, in the conveyor belt visibility is improved for the safety of the operator, the upper cover layer; a core layer disposed under the upper cover layer; a lower cover layer disposed under the core layer; and a visibility member disposed on the outermost surface in the width direction of the conveyor belt in the height direction of the conveyor belt, wherein the visibility member is different from the color of at least one of the upper cover layer and the lower cover layer A conveyor belt having a color is provided.

As an example, the visibility member may be formed at both ends in the width direction of the Sangki conveyor belt.

Meanwhile, the visibility member may have a shape in contact with side surfaces of the upper cover layer and the lower cover layer, and in contact with at least a portion of an upper surface and a lower surface of the core layer.

In this case, when the width of the visibility member formed on the upper cover layer is d4 and the width of the visibility member formed on the core layer is d3, d4 may have a visibility member having a larger shape than that of d3. .

In this case, the d4 may have a visibility member having a shape of 1.5 times or more of that of d3.

In the present invention, the above-described visibility member is prepared from a colored rubber composition comprising a polymer and an additive, wherein the polymer includes 55-75 parts by weight of NR, 15-35 parts by weight of SBR, and 5-15 parts by weight of BR can do.

In this case, the visibility member may have an adhesive strength of 8.4 kN/m or more with the upper cover layer, the lower cover layer, and the core layer.

The inventors of the present invention have found that the environment in which the conveyor belt is driven generates a lot of noise and is often dark, so that an operator approaches the conveyor belt without recognizing it and accidents occur in many cases, and to overcome this, the present invention of the visibility member 400 was developed. However, when the colored rubber is simply formed on both ends of the conveyor belt in the width direction, there is a problem in that the adhesion between the visibility member 400 and each rubber layer is remarkably poor, and in order to overcome this problem, the visibility member 400 ) led to the development of the added conveyor belt (10).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a conveyor belt according to an embodiment of the present invention, and FIG. 2 shows a cross section taken along line A-A in FIG. 1 .

1 and 2 , the conveyor belt 10 includes an upper cover layer 100 , a core layer 200 , a lower cover layer 300 , and a visibility member 400 .

The upper cover layer 100 refers to a surface on which a transport target is brought into contact with each other. The upper cover layer 100 is manufactured from a rubber composition for the upper cover layer including a polymer and an additive.

The upper cover layer 100 has an adhesive strength between the adjacent rubber layer, that is, the core layer 200 and the visibility member 400, of 25 kgf/inch or more, for example, 30 kgf/inch or more, for example, 25 to 40 kgf/inch, For example, it may be 30 to 35 kgf / inch, it is possible to prevent the delamination phenomenon during the manufacturing process of the conveyor belt within the above range.

For example, the upper cover layer 100 is NR (Natural Rubber), SBR (Styrene-Butadiene Rubber), BR (Butadiene Rubber), CR (polychloroprene rubber), EPDM (Ethylene Propylene Diene Terpolymer), EPM (ethylene propylene rubber) , NBR (nitrile butadiene rubber), BIIR (brominated poly (isobutylene-co-isoprene) rubber), and IR (Isoprene Rubber) may be manufactured using a top cover layer polymer comprising at least one.

In this case, the upper cover layer 100 may be prepared from the upper cover layer rubber composition including 50 to 70 parts by weight of SBR and 30 to 50 parts by weight of NR per 100 parts by weight of the polymer, and other additives. For example, the upper cover layer 100 may include 55 to 65 parts by weight of SBR and 35 to 45 parts by weight of NR per 100 parts by weight of the polymer.

In this case, the upper cover layer 100 may further include a fluorescent material or a fluorescent material. For example, the upper cover layer 100 is an upper cover layer rubber containing 50 to 65 parts by weight of SBR, 30 to 50 parts by weight of NR, and 5 to 20 parts by weight of a fluorescent material per 100 parts by weight of the upper cover layer polymer. can be prepared from the composition.

At this time, by controlling the particle diameter of the fluorescent material to be 0.5 to 8 μm, improvement of physical properties by filling and dispersion can be expected, and heat resistance can be supplemented.

For example, the upper cover layer 100 is manufactured from a rubber composition for the upper cover layer including a polymer and an additive.

The polymer may be a blend in which an EVA (ethylene-vinyl acetate) subtitle is included in a subject including natural or synthetic rubber and poly (vinyl chloride) (PVC). The synthetic rubber may include any one or more of BR (Butadiene Rubber), SBR (Styrene Butadiene Rubber), SSBR (Solution Styrene Butadiene Rubber), and NBR (Nitrile-butadiene rubber).

For example, the polymer composition may be 50 to 80 parts by weight of the synthetic rubber: PVC: EVA: 15 to 35 parts by weight: 5 to 25 parts by weight.

When BR (Butadiene Rubber) is included as the synthetic rubber, abrasion resistance, flex resistance, rebound elasticity, and cold resistance of the upper cover layer 100 may be improved. In this case, BR may be prepared by solution polymerization of butadiene.

When SBR (Styrene Butadiene Rubber) is included as the synthetic rubber, uniform quality of the upper cover layer 100 may be achieved, and heat resistance and abrasion resistance may be improved. At this time, SBR can be prepared by low-temperature emulsion polymerization of Styrene and Butadiene.

When SSBR (Solution Styrene Butadiene Rubber) is included as the synthetic rubber, heat resistance and abrasion resistance of the upper cover layer 100 may be improved. In this case, SSBR may be prepared by solution polymerization using a Li (lithium) catalyst.

When NBR (Nitrile-butadiene rubber) is included as the synthetic rubber, it is possible to significantly improve usability with PVC while improving the abrasion resistance and heat resistance of the upper cover layer 100 . In this case, NBR can be prepared by low-temperature emulsion polymerization of acrylonitrile and butadiene.

When EVA is used as the sub-agent, flexibility, surface gloss, and texture of the upper cover layer 100 may be improved.

For example, 60 to 80% by weight of NBR and 20 to 40% of polyvinyl chloride (PVC) may be mixed. By adding PVC to NBR, slip property is improved compared to conventional NBR, surface gloss or texture is improved, and flexibility can also be improved. Within the above content range, the compatibility between NBR and PVC is excellent, the slip property is greatly improved compared to the case of using only NBR in the prior art, and the surface gloss and texture are excellent.

Ethylene Vinyl Acetate (EVA) sub-agent may be mixed with the main mixture of NBR and PVC to form the polymer. Based on 100 parts by weight of the polymer, 75 to 85 parts by weight of the main agent and 15 to 25 parts by weight of the EVA (Ethylene Vinyl Acetate) sub-agent may be mixed. When the amount of EVA is 25 parts by weight or more, there may be a problem that mixing with the main material does not occur well, and when it is 15 parts by weight or less, the improvement effect of the flexibility, surface gloss, ozone resistance, and texture of the top cover layer 100 is insufficient. can

As the additive, white carbon, a filler, a process oil, a vulcanizing agent, a vulcanization accelerator, a vulcanization accelerator and a slip agent are added.

White carbon is used as a rubber reinforcing agent, and finely divided anhydrous silicic acid, hydrous calcium silicate, and aluminum silicate are used. The amount to be added may be, for example, 15 to 25 parts by weight based on 100 parts by weight of the upper cover layer rubber composition.

A filler is added for the purpose of reinforcing and increasing the amount of the upper cover layer rubber composition, for example, 30 to 50 parts by weight may be added based on 100 parts by weight of the upper cover layer rubber composition.

Oil (process oil) is blended in the upper cover layer rubber composition and added to increase the flexibility of the product as well as the upper cover layer rubber composition itself and to improve processability, for example, 100 parts by weight of the upper cover layer rubber composition 3 to 8 parts by weight may be added.

On the other hand, in order to form a crosslinked structure between rubber molecules, a vulcanizing agent such as sulfur is added to the rubber to increase the elasticity of the rubber. That is, vulcanization refers to an operation of mixing raw rubber with a vulcanizing agent to form a cross-linked structure between rubber molecules, and this operation can increase the elasticity of rubber. For example, 1 to 5 parts by weight of a vulcanizing agent may be added to 100 parts by weight of the upper cover layer rubber composition.

A vulcanization accelerator is a substance added for the purpose of promoting the vulcanization reaction in combination with a vulcanizing agent, increasing the vulcanization rate during rubber vulcanization, lowering the vulcanization temperature, and shortening the vulcanization time, for example, the above phase 0.5 to 5 parts by weight may be added based on 100 parts by weight of the cover layer rubber composition.

The vulcanization accelerator is a compounding agent used in combination with the vulcanization accelerator to perfect the accelerating effect, for example, zinc oxide (ZnO) may be used as the vulcanization accelerator. For example, 1 to 8 parts by weight of ZnO may be added based on 100 parts by weight of the upper cover layer rubber composition.

In the upper cover layer rubber composition, a slip agent may be added as an additive in order to improve slip properties by reducing frictional resistance on the surface of the conveyor belt. The slip agent reduces the coefficient of friction of the upper cover layer, prevents abrasion of the conveyor belt due to being caught between the skirt board and the conveyor belt, and friction between the conveyor belt and the particulate raw material at the upper cover side in contact with the raw material It is possible to further improve the effect of reducing the resistance and preventing the sludge cake from adhering to the surface.

For example, at least one of 9-Octadecenamide (C17H33CONH2), 13-Docosenamide (C21H41CONH2), Octadecanamide (C17H35CONH2), and Docosanamide (C21H43CONH2) or a blend thereof may be used as the slip agent. For example, the slip agent may be used in an amount of 0.3 to 10 parts by weight based on 100 parts by weight of the upper cover layer rubber composition. Considering the polymer composition according to an embodiment of the present invention, when the slip agent content is less than 0.3 parts by weight, the slip property improvement effect is insignificant, and as the slip agent content increases, the slip property improves effect, but 10 parts by weight When it exceeds, even if the content of the slip agent is increased, there is no effect of reducing the friction coefficient of the upper cover layer 10, but there may be a problem in that durability is reduced.

In addition, pigments, dispersants, and antioxidants may be further added as additives. For example, stearic acid may be used as the dispersing agent, and 0.1 to 2 parts by weight may be used based on 100 parts by weight of the upper cover layer rubber composition. For example, 1 to 5 parts by weight of the pigment may be added based on 100 parts by weight of the upper cover layer rubber composition, and 1 to 3 parts by weight of the antioxidant may be added based on 100 parts by weight of the upper cover layer rubber composition.

The core layer 200 is a portion formed in the center of the conveyor belt 10 to improve durability of the conveyor belt 10, and includes nylon, polyester, aramid material, steel cord, and the like. The core layer 200 may be in a form in which one or a plurality of belt papers (not shown) are stacked, for example, 1 to 15 pieces may be stacked. For example, the belt paper (not shown) may be a rubber layer including a nylon, polyester, or aramid material, and a steel cord may be selectively inserted between the rubber layers. For example, when three belt papers (not shown) are applied, the upper belt paper and the lower belt paper include NN (Nylon/Nylon) material, and the middle belt paper may be applied in a form in which a steel cord is inserted. For example, when six belt papers (not shown) are applied, the upper two belt papers and the lower two belt papers contain NN (Nylon/Nylon) material, and the middle two belt papers have a steel cord inserted. can be Such a structure may be applied to balance rigidity and flexibility.

For example, any one or more of 3x3, 3x6, 3x7, and 4x6 7x7 7x19 structures may be applied to the steel cord, and the diameter of the steel cord, the adhesion to the adhesive rubber, the degree to which the rubber penetrates well between the steel cords, the package The mixing ratio with the control rubber can be determined in consideration of the degree of shock absorption of the For example, the steel cord may have a diameter of 0.8 mm to 11 mm. Within the above numerical range, sufficient rigidity can be provided without excessively increasing the thickness of the conveyor belt.

In addition, the thickness of the core layer 200 is 0.5 mm to 10.0 mm applied depending on the environment of use of the conveyor belt, thereby satisfying both flexibility and rigidity of the conveyor belt. Meanwhile, when the steel cord material is applied to the core layer 200 , brass plating treated with copper and zinc may be additionally formed on the surface to improve adhesion to rubber.

The lower cover layer 300 refers to a surface in contact with a driving roller in the conveyor belt, for example, an idler.

The lower cover layer 300 may be manufactured from the lower cover layer rubber composition, and any one of the upper cover layer rubber compositions described above may be applied to the lower cover layer rubber composition.

As another example, the lower cover layer 400 may reduce power consumption by 20% or more compared to a conventional conveyor belt by controlling the viscoelastic properties of the rubber composition of the lower cover layer. That is, the lower cover layer 400 recovers quickly from the deformation of the rubber that occurs when in contact with the driving roller so that the rebound resilience level is 75 (based on KS M 6534) to reduce the contact area with the driving roller, Energy loss due to strain fatigue that occurs continuously can be minimized.

At this time, the lower cover layer rubber composition is NR (Natural Rubber), SBR (Styrene-Butadiene Rubber), BR (Butadiene Rubber), CR (polychloroprene rubber), EPDM (Ethylene Propylene Diene Terpolymer), EPM (ethylene propylene rubber), may include at least one of NBR (nitrile butadiene rubber), BIIR (brominated poly(isobutylene-co-isoprene) rubber), and IR (Isoprene Rubber), for example, NR 51 to 73 parts by weight and BR It may contain 27 to 49 parts by weight, for example, the BR may include Ultra High-cis Polybutadiene Rubber.

The visibility member 400 may be disposed in at least one of the upper cover layer 100 and the lower cover layer 300 in the conveyor belt 10 , and disposed in all layers along the height direction of the conveyor belt 10 . can be

For example, the visibility member 400 may have a color different from at least one of the upper cover layer 100 , the core layer 200 , and the lower cover layer 300 .

For example, the visibility member 400 may be manufactured from a colored rubber composition.

The colored rubber composition may include a polymer and an additive.

The polymer may include 55-75 parts by weight of NR, 15-35 parts by weight of SBR, and 5-15 parts by weight of BR, and the tensile strength of the visibility member 400, elongation, It can greatly improve flame retardancy and heat resistance while maintaining adhesive strength, and even when a rubber sheet is formed integrally with other rubber layers, tensile strength and elongation are still maintained, and the rate of change of physical properties before and after aging is greatly reduced, which greatly improves safety during field use. can For example, the polymer may include 60 to 70 parts by weight of NR, 20 to 30 parts by weight of SBR, 8 to 12 parts by weight of BR, for example, the polymer may include 64 to 66 parts by weight of NR, 23 to 27 parts by weight of SBR. It may include 8 to 12 parts by weight of BR.

The additive may include white carbon, a flame retardant, a pigment, and a vulcanizing agent.

The white carbon is for applying a color, and may be included in an amount of 20-40 parts by weight, for example, 26-34 parts by weight, based on 100 parts by weight of the colored rubber composition.

The flame retardant is for improving the flame retardancy of the visibility member 400, and may be included in an amount of 20-35 parts by weight, for example, 25-30 parts by weight, based on 100 parts by weight of the colored rubber composition.

The pigment is for coloring the visibility member 400, and may be included in an amount of 1-5 parts by weight, for example, 1.5-4 parts by weight, based on 100 parts by weight of the colored rubber composition. For example, the pigment may be any one of a blue pigment, a yellow pigment, and a red pigment.

The vulcanizing agent is for improving the elasticity of rubber by forming a crosslinking structure between rubber molecules, for example, sulfur may be used, and 1 to 5 parts by weight may be added to 100 parts by weight of the colored rubber composition.

For example, the colored rubber composition for manufacturing the visibility member 400 may further include a fluorescent material. For example, the polymer included in the colored rubber composition may include 50 to 65% of SBR (Styrene-Butadiene Rubber), 30 to 50% of NR (Natural Rubber), and 5 to 20% of a fluorescent material. and the fluorescent material may have a particle diameter of 10 μm to 15 μm.

On the other hand, the visibility member 400 has a width (d3, d4, d5), a length (d1), a height (d6) at at least one side end of the conveyor belt 10 in the width direction, the conveyor belt 10 along the longitudinal direction It may be arranged at a predetermined interval d2.

d1 may indicate a length of the visibility member 400 , and d2 may indicate a distance between the visibility members 400 .

d3 may refer to the width of the thinnest portion of the visibility member 400 , for example, the width of the visibility member 400 formed on the side surface of the core layer 200 .

d4 may refer to the width of the visibility member 400 formed in the upper cover layer 100 , and d5 may refer to the width of the visibility member 400 formed in the lower cover layer 300 .

d6 may refer to the height of the conveyor belt 10 .

In this case, d2 may be 5 to 40 times greater than d1, for example, d2 may be 5 to 10 times greater than d1. For example, d2 may be 50 cm to 200 cm, for example, 100 cm to 200 cm, and d1 may be 5 cm to 20 cm. Within the above numerical range, visibility of the operator can be ensured, and the adhesive force of the conveyor belt 10 with each layer manufactured from the above-described rubber composition may not deteriorate.

For example, the visibility member 400 may be disposed at both side ends in the width direction of the conveyor belt 10 .

For example, the visibility member 400 is formed in contact with the side surfaces of the upper cover layer 100, the core layer 200, and the lower cover layer 300, at least part of the upper and lower surfaces of the core layer 200. It may be formed by contact. In this case, in the visibility member 400 , the width d4 formed in the upper cover layer 100 and the lower cover layer 300 may be wider than the width d3 formed in the core layer 200 , for example, d4 is d3 It may be 1.5 times or more compared to, for example, it may be 1.5 times to 3.0 times.

That is, as d4 is larger, as the contact area of the visibility member 400 in contact with the upper and lower surfaces of the core layer 200 increases, the adhesive force increases, so that the visibility member 400 is stably disposed on the conveyor belt 10 . However, in the case of using the above-described rubber composition, the width d4 of the visibility member 400 formed in the upper cover layer 100 is 1.5 than the width d3 of the visibility member 400 formed in the core layer 200 In the case of times to 3.0 times, the visibility member 400 of the conveyor belt 10 is stably adhered to the conveyor belt 10 , so that the tensile strength of the conveyor belt 10 is not deteriorated.

Although d5 may have the same length as d4, when the conveyor belt 10 is driven in a state in which both side ends are bent upward in response to the arrangement of the idlers supporting the lower portion of the conveyor belt 10, the operator In order to easily recognize the conveyor belt 10 being driven through the lower portion of the lower cover layer 300 of the conveyor belt, d5 may be formed to be longer than d4, for example, d5 is 1.3 compared to d4. It may be formed to be twice to 2.0 times longer. Within the above numerical range, while the visibility of the conveyor belt 10 is increased, the physical properties of the conveyor belt 10 may not be deteriorated.

The visibility member 400 may be formed so that the d6 is 5 to 10 times the d3. Within the above numerical range, while the visibility of the conveyor belt 10 is increased, the adhesive strength of the visibility member 400, which is a colored rubber, the upper cover layer 100, the core layer 200, and the lower cover layer 300 is improved. can

In this way, each layer of the conveyor belt 10 is manufactured from the above-described rubber composition, and the length, height, and thickness of the visibility member 400 are controlled as described above, so that even if the visibility member 400 that is a colored rubber is included, the conveyor belt The physical properties of (10) may be improved rather than deteriorated.

In addition, although not shown in the drawings, the surface of the visibility member 400 in contact with the upper cover layer 100 , the core layer 200 , and the lower cover layer 300 has a wave-shape, so that the visibility member By increasing the contact area with 400, the adhesion between the colored layer and the black layer can be further improved.

3 shows a conveyor belt 10a according to an embodiment of the present invention, FIG. 4 shows a cross section taken along AA in FIG. 3, and FIG. 5 shows a conveyor belt 10b according to an embodiment of the present invention. ) is shown, FIG. 6 is a cross-section taken along AA in FIG. 5, FIG. 7 is a conveyor belt according to another embodiment of the present invention, and FIG. 8 is a cross-section taken along AA in FIG. is shown. 3 and 4, except that the shape of the visibility member 400a is different, the rubber composition of the conveyor belt 10 described above for FIGS. 1 and 2 may be applied, and FIGS. 5 and 6 are the core layer ( 200b) Except that the ear rubber 500b is provided on both sides, the configuration described below with reference to FIGS. 3 and 4 can be applied as it is, and FIGS. 7 and 8 are different in the form of the visibility member 400c except that And, the rubber composition of the conveyor belt 10 described above with reference to FIGS. 1 and 2 may be applied.

For example, the visibility member 400a has a thickness d3a at at least one side end in the width direction of the conveyor belt 10a, a thickness direction (x) of the conveyor belt 10a width d4a, d5a, and a conveyor belt 10a. has a width d1a and a height d6a in the longitudinal direction y of the conveyor belt 10a and may be disposed at a predetermined interval d2a along the longitudinal direction of the conveyor belt 10a.

Meanwhile, the visibility member 400a may have a width d1a, a length d4a + d5a + d6a, and a thickness d3a.

That is, the unit member of the visibility member 400a consisting of the width (d1a), the length (d4a + d5a + d6a), and the thickness (d3a) is divided into an upper cover layer 100a, a lower cover layer 300a, and a core layer ( 200a) and then pressurized to be integrated into the conveyor belt 10a.

For example, d4a may be 4 times or more compared to d3a, for example, 4 times to 20 times, and in another example, 5 times to 15 times.

For example, the thickness d3a may be 0.5 mm to 2 cm.

In the sense that a colored layer or a fluorescent layer is applied to the visibility member 400a, when the conveyor belt 10a is driven in a harsh environment, the adhesion between the visibility member 400a and the upper cover layer and the lower cover layer is poor and tensile A problem of poor strength may occur.

Therefore, the conveyor belt 10a of the present invention sufficiently secures the length (d4a + d5a + d6a) to increase visibility and at the same time minimizes the thickness d3a of the visibility member 400a, so that the conveyor belt 10a is harsh It was possible to eliminate the problem of rapidly deteriorated physical properties even when driven in an environment.

For example, d2a may be 100 cm to 200 cm, and d1a may be 5 cm to 20 cm. Within the above numerical range, visibility of the operator can be ensured, and the adhesive force of the conveyor belt 10a with each layer manufactured from the above-described rubber composition may not deteriorate.

For example, the visibility member 400a may be disposed at both ends of the conveyor belt 10a in the width direction.

For example, the visibility member 400a is formed in contact with the side surfaces of the upper cover layer 100a, the core layer 200a, and the lower cover layer 300a, at least in part of the upper and lower surfaces of the core layer 200a. It may be formed in contact, and for example, may be integrated with the upper cover layer 100a, the core layer 200a, and the lower cover layer 300a.

The d5a may have the same length as d4a, but when the conveyor belt 10a is driven in a state in which both side ends are bent upward in response to the arrangement of the idlers supporting the lower portion of the conveyor belt 10a, the operator In order to easily recognize the conveyor belt 10a being driven through the lower part of the lower cover layer 300a of the conveyor belt, d5a may be formed to be longer than d4a, for example, d5a is 1.3 compared to d4a. It may be formed to be twice to 2.0 times longer. Within the above numerical range, while the visibility of the conveyor belt 10a is increased, the physical properties of the conveyor belt 10a may not be deteriorated.

The visibility member 400a may be formed so that d6a is 5 to 10 times that of d3a. Within the above numerical range, while the visibility of the conveyor belt 10a is increased, the adhesion between the visibility member 400a, which is a colored rubber, the upper cover layer 100a, the core layer 200a, and the lower cover layer 300a, is improved. can

On the other hand, in the conveyor belt 10a, each layer is manufactured from the above-mentioned rubber composition, and the length, height, and thickness of the visibility member 400a are controlled as described above, thereby sufficiently ensuring visibility and at the same time ensuring visibility of a colored rubber visibility member ( Even if 400a) is included, the physical properties of the conveyor belt 10a do not deteriorate, but rather can be improved.

5 and 6, when the ear rubber 500b is provided on both sides of the core layer 200b, the visibility member 400b may be in contact with the ear rubber 500b. For example, the ear rubber 500b may use the same material as at least any one of the above-described upper cover and lower cover rubber compositions, and the visibility member 400b is the visibility member 400a described with reference to FIGS. 3 and 4 . and width (d1a), length (d4a + d5a + d6a), and thickness (d3a) may be the same.

On the other hand, as shown in Figures 5 and 6, when the ear rubber 500b is provided on both sides of the core layer 200b, the visibility member 400b is provided on the side of the core layer 200a. and may be integrated with the upper cover layer 100b, the ear rubber layer 500b, and the lower cover layer 300b, for example.

7 and 8, when the ear rubber is not provided on both sides of the core layer 200c, the visibility member 400c is formed only on the upper cover layer 100c and the lower cover layer 300c, The end of the layer 200c may constitute the end of the conveyor belt 10c.

The visibility member 400c is in that a colored layer or a fluorescent layer is applied, and when the conveyor belt 10c is driven in a harsh environment, the visibility member 400c and the upper cover layer 100c and the lower cover layer 300c. There may be a problem in that the adhesive strength of the adhesive is poor and the tensile strength is poor.

Therefore, in the conveyor belt 10c of the present invention, the visibility member 400c is formed only on the upper cover layer 100c and the lower cover layer 300c, so that the physical properties of the conveyor belt 10c are sharp even when the conveyor belt 10c is driven in a harsh environment. It was possible to eliminate the occurrence of a problem that became worse.

In this case, the numerical ranges and relationships of d1a, d2a, d3a, d4a, d5a, and d6a may be applied as described above with reference to FIGS. 3 and 4 .

On the other hand, in the conveyor belt 10c, each layer is manufactured from the above-mentioned rubber composition, and the lengths d4a, d5a, and thickness d3a of the visibility member 400c are controlled as described above, thereby ensuring sufficient visibility at the same time. Even if the visibility member 400c, which is a colored rubber, is included, the physical properties of the conveyor belt 10c are not deteriorated, but rather can be improved.

A conveyor belt comprising an upper cover layer, a lower cover layer, and a core layer made of the above-mentioned rubber composition, and having a visibility member having a width, length, and thickness in the aforementioned numerical range, formed at both ends of the conveyor belt was manufactured, Physical properties were measured in the following way.

- Tensile strength, elongation rate, adhesive strength: Measure tensile strength and elongation rate according to the method specified in KS M 6534 : 2018

- Aging test: After accelerated aging for 168 hours continuously at (70±1)℃ according to the method specified in KS M ISO 188, measure the tensile strength and elongation according to the method specified in KS M 6534: 2018

The upper cover layers 100, 100a, 100b, and 100c have a tensile strength of 17 MPa or more, an elongation of 580% or more, and a change rate of tensile strength after aging of -10.0% or more, that is, a decrease rate within 10%, and a change rate of elongation - 20% or more, that is, the reduction rate may be within 20%. The lower cover layers 300, 300a, 300b, and 300c have a tensile strength of 14 MPa or more, an elongation of 540% or more, and a change in tensile strength after aging of -16% or more, that is, a decrease within 16%, and a change in elongation - 22% or more, that is, the reduction rate may be within 22%.

That is, the upper cover layers 100, 100a, 100b, 100c and the lower cover layers 300, 300a, 300b, and 300c manufactured according to an embodiment of the present invention have high tensile strength and elongation, and tensile strength after aging conditions. Since the rate of change of strength and elongation is not large, safety can be excellent even when driven in a harsh environment.

The visibility members 400, 400a, 400b, and 400c have a tensile strength of 19 MPa or more, an elongation of 610% or more, and a tensile strength change rate of -10.0% or more after aging, that is, a decrease rate within 10%, and an elongation rate change rate of -20 % or more, that is, the reduction rate may be within 20%. That is, the visibility members 400 , 400a , 400b , and 400c manufactured according to an embodiment of the present invention do not have large change rates of tensile strength and elongation after aging, so safety can be excellent even when driven in a poor environment.

In addition, the visibility member (400, 400a, 400b, 400c) is the upper cover layer (100, 100a, 100b, 100c), the lower cover layer (300, 300a, 300b, 300c), and the core layer (200, 200a, 200b, 200c) may have an adhesive strength of 8.4 kN/m or more, for example, 8.4 kN/m to 10.3 kN/m. That is, although the visibility member 400 manufactured according to an embodiment of the present invention is colored rubber, the adhesion with the black rubber layers is greatly improved, and physical properties such as tensile strength of the conveyor belt 10 can be greatly improved. have.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings, but since the above-described embodiments have only been described with preferred examples of the present invention, the present invention is limited only to the above embodiments. It should not be understood, and the scope of the present invention should be understood as the following claims and their equivalents.

For example, the temperature described as the experimental condition in this experimental example is an example of the experiment, and the experiment may be performed at 100° C., 150° C., or higher temperature for heat resistance measurement.

For example, the drawings are schematically shown with each component as a main body to help understanding, and the thickness, length, number, etc. of each illustrated component may differ from the actual due to the drawing process. In addition, the material, shape, dimension, etc. of each component shown in the above embodiment are only examples, and are not particularly limited, and various changes are possible within a range that does not substantially depart from the effects of the present invention.

10, 10a, 10b, 10c: conveyor belt
100, 100a, 100b, 100c: upper cover layer
200, 200a, 200b, 200c: deep body layer
300, 300a, 300b, 300c: lower cover layer
400, 400a, 400b, 400c: visibility member
500b: ear rubber

Claims (8)

In the conveyor belt, visibility is improved for the safety of workers,
top cover layer;
a core layer disposed under the upper cover layer;
a lower cover layer disposed under the core layer; and
a visibility member provided at an end of the conveyor belt in the width direction;
including,
The visibility member has a color different from the color of at least one of the upper cover layer and the lower cover layer,
Doedoe arranged in the height direction of the conveyor belt,
A conveyor belt having a shape in contact with side surfaces of the upper cover layer and the lower cover layer and in contact with at least a portion of an upper surface and a lower surface of the core layer.
The method according to claim 1,
The visibility member is formed at both ends in the width direction of the Sangki conveyor belt, the conveyor belt.
delete The method according to claim 1,
When the width of the visibility member formed in the upper cover layer is d4 and the width of the visibility member formed in the core layer is d3,
The d4 is a conveyor belt having a larger shape than the visibility member d3.
5. The method according to claim 4,
The d4 is a conveyor belt having a visibility member in the form of 1.5 times or more of the d3.
delete 6. The method according to any one of claims 1 to 2 and 4 to 5,
The visibility member is manufactured from a colored rubber composition comprising a polymer and an additive,
wherein the polymer comprises 55-75 parts by weight NR, 15-35 parts by weight SBR, and 5-15 parts by weight BR.
8. The method of claim 7,
The visibility member has an adhesive strength of 8.4 kN/m or more with the upper cover layer, the lower cover layer, and the core layer.

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