WO2004037689A1

WO2004037689A1 - Conveyor belt for pipe conveyor and pipe conveyor equipment using the conveyor belt

Info

Publication number: WO2004037689A1
Application number: PCT/JP2002/012809
Authority: WO
Inventors: Toshiki Sakaguchi; Atsushi Imai
Original assignee: Bridgestone Corporation
Priority date: 2002-10-28
Filing date: 2002-12-06
Publication date: 2004-05-06
Also published as: JP2004142926A

Abstract

A conveyor belt (1), comprising a core material (2) and a plurality of rubber layers (3), (4), and (5) installed on both surfaces thereof, wherein a cover rubber layer (5), which is the outermost rubber layer, is formed of a low friction low resistance rubber or a low loss rubber, whereby the conveyor belt for pipe conveyor allowing the prevention of collapse of the belt and a reduction in power consumption of a motor to coexist with each other can be provided.

Description

Specification

Conveyor belt for pipe conveyor and pipe conveyor device using the same

The present invention relates to a conveyor belt for a pipe conveyor and a pipe conveyor device using the conveyor belt. '

Background of the Invention

FIGS. 4 and 5 show an example of a conventional pipe conveyor device.

In this conventional pipe conveyor device, an endless belt-shaped conveyor belt (21) is developed and circulated around a front pulley (22) and a rear pulley (23) in a flat plate shape, and circulated. In the intermediate portion between the pulleys (22) and (23) in (21), a large number of guide frames (25) (26) (27) in which a plurality of guide rollers (24) are arranged in a substantially annular or gutter-like shape , The conveyor belt is rolled into a cylindrical shape having overlapping polymerized portions (28), and the conveyed object (29) is wrapped in the cylindrical portion. ) To transport with the lid.

As shown in Fig. 5, the middle guide frame (26) has an upper chamber (26b) and a lower chamber (26c) each having a window hole (26a) through which a conveyor belt (21) passes. The above-mentioned plurality of guide rollers (24) are annularly disposed in each of the rooms (26b) and (26c) so as to surround the window hole (26a). . The window (26a) of the upper room (26b) has a forward belt (21a) on the outward side of the conveyor belt (21), and the window (26a) of the lower room (26c) has a conveyor belt (21). The return belt (21b) on the return path side is passed through, and each belt (21a) (21b) is held in a cylindrical shape.

As shown in FIG. 6, the belt (30) for a pipe conveyor is formed, for example, by vulcanizing a rubber composition obtained by blending carbon black, carbon dioxide, and the like with a rubber component composed of natural rubber and / or synthetic rubber. In general, a core material such as a steel cord (32) (FIG. 4a) or a canvas (33) (FIG. 4b) is embedded in a cover rubber (31). (See Patent Document 1).

Generally, in a belt conveyor over a long distance, the belt comes into contact with a large number of rollers, and the energy loss generated at the time of the contact causes an increase in the power consumption of the motor driving the belt. It is known. In order to reduce such energy loss, the force par rubber layer that constitutes the belt is

—As a constituent rubber material: a) A rubber composition comprising 20 to 55 parts by weight of carbon black with a polymer consisting of 40 to 100 parts by weight of natural rubber and 60 to 0 parts by weight of polybutadiene rubber (property loss factor) (Tans)及Pi dynamic elastic modulus (E ') force S, their respective, 0.04≤tanS≤0.12, E' ≥ a 20 kgf / cm ^2), or b) a natural rubber and a terminal-modified as the polymeric component It has been proposed to use a rubber composition containing polybutadiene rubber, wherein the weight ratio of natural rubber and terminal-modified polybutadiene rubber is in the range of natural rubber / terminal-modified polybutadiene rubber = 90Z10 to 30/70. (See Patent Documents 2 and 3).

Further, in the belt for belt conveyor, in order to reduce abrasion caused by friction with a conveyed object, an acid amide and / or a rubber component are used as a material constituting a cover rubber layer on a surface of the belt on which a conveyed object is mounted. It is also known to use a rubber composition having an improved abrasion life, which comprises a friction reducing agent composed of silicone oil (see Patent Document 4).

Patent Document 1 Japanese Patent Application Laid-open No.

Patent Document 2 JP-A-11-113

Patent Document 3 Japanese Patent Application Laid-Open No. 2001-266670

Patent Document 4 Japanese Patent Application Laid-Open No. 2002-02-1797231

For pipe conveyor equipment, it is a major issue to achieve both improvement of so-called "belt collapse" and reduction of motor power consumption. The improvement of the belt crushing leads to maintenance-free operation, and the reduction of motor power consumption leads to energy saving characteristics.

Belt collapse is a phenomenon in which the rigidity of the belt in the width direction is insufficient, and it is not possible to maintain sufficient roundness during traveling.This causes 1) the specified amount of conveyance cannot be secured, and 2) traveling is unstable. (Twisted), 3) The overlapping part is easy to open, causing problems such as scattering of the conveyed material.

Belt crushing is improved by increasing the rigidity, such as by using a fabric or steel cord having higher rigidity as a core material, or by increasing the number of layers of the canvas or the number of steel cords. However, the increase in belt stiffness also raises the following new problems.

1) With the increase in rigidity, the force to open the cylindrical belt increases, and rubber overlaps with each other in the overlapping portion of the belt, causing frictional resistance. The frictional force F at the superposed part is

F = μ 'X N

(Where 'is the coefficient of kinetic friction of rubber; Ν is the pressing force of the belt against the guide roller). When the rigidity of the belt increases, the pressing force へ against the guide roller increases. And the frictional force F increases. Furthermore, as the frictional force increases, so does the wear in the overlap.

2) The contact area of the belt with the guide roller and the effect on the roller are increased, and resistance is generated when the belt gets over the roller. This resistance to over-rolling causes hysteresis loss due to rubber deformation that occurs when the roller rolls over the rubber, and increases energy loss.

3) As the rigidity increases, the opening force of the cylindrical belt increases, and the drawing resistance at the part where the belt is rolled increases.

The increase in these resistances naturally causes an increase in the power consumption of the motor.

Therefore, resolving the collapse of the belt by increasing the rigidity of the belt and reducing the power consumption of the motor are mutually contradictory.

In addition, silicone oil may be applied to the belt surface or a low-friction film may be applied, but the effect is temporary and non-persistent. There are problems such as the need to install a film, and the need to perform film re-working on a regular basis.

Disclosure of the invention

An object of the present invention is to provide a conveyor belt for a pipe conveyor and a pipe conveyor device using the same, which can simultaneously and permanently prevent the collapse of the belt and reduce the power consumption of the motor. Aim.

According to the present invention, it is wound endlessly between a pair of spaced pulleys, and at the winding portion of the pulley, it is flattened and at least the forward and backward paths between the pulleys are provided. In either case, the middle part is made to run with a rounded cylindrical shape. A conveyor belt for a pipe conveyor, comprising: a plurality of rubber layers laminated to each other, wherein at least one outermost rubber layer, the cover rubber 詹, has a lower dynamic friction resistance than the other rubber layers. A conveyor belt for a pipe conveyor characterized by being formed of friction resistance rubber is provided.

According to the present invention, the pulley is wound endlessly between a pair of pulleys spaced apart from each other, and at the winding portion of the pulley, is flattened, and at least one of the outward path and the return path between the pulleys is provided. On the one hand, it is a conveyor belt for a pipe conveyor in which an intermediate portion is made to run in a substantially cylindrical shape by a plurality of guide frames in which a plurality of guide rollers are arranged in a substantially annular or gutter shape, and is laminated on each other. The cover rubber layer, which is the outermost rubber layer on the side in contact with the guide roller, is provided by a low-loss rubber having a smaller physical loss factor (tan S) than the other rubber layers. A conveyor belt for a pipe conveyor characterized by being formed is provided.

According to the present invention, furthermore, it is wound endlessly between a pair of pulleys spaced apart from each other, and at the winding portion of the pulley, it is flattened and at least one of the outward path and the return path between the pulleys On the one hand, it is a conveyor belt for a pipe conveyor in which an intermediate portion is made to run in a substantially cylindrical shape by a plurality of guide frames in which a plurality of guide rollers are arranged in a substantially annular or gutter shape, and is laminated on each other. And a cover rubber layer, which is the outermost rubber layer on the side in contact with the guide roller, is formed of a low-loss rubber having a smaller physical loss factor (tan S) than the other rubber layers. And the outermost rubber layer, which is the outermost rubber layer on the opposite side, is made of low frictional resistance rubber having a lower dynamic frictional resistance than other rubber layers. Bae catcher for con base Yaberuto is provided.

According to the present invention, furthermore, a conveyor belt is wound endlessly between a pair of spaced pulleys, and the conveyor belt is spread flat at the winding portion of the pulley, At least one of the forward path and the return path between the pulleys is configured so that the conveyor belt is run in a substantially cylindrical shape by a plurality of guide frames in which a plurality of guide rollers are arranged in a substantially annular or gutter shape. In the pipe conveyer device of the present invention, any one of the above conveyor belts was used as the conveyor belt. A pipe conveyor device is provided.

BRIEF DESCRIPTION OF THE FIGURES

The above and other features, functions and effects of the present invention will become more apparent from the following description of embodiments with reference to the accompanying drawings.

FIG. 1 is a sectional view of the first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a sectional view of a third embodiment of the present invention.

FIG. 4 is a schematic side view showing an example of a conventional pipe conveyor device.

FIG. 5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is a sectional view of a conventional conveyor belt for a pipe conveyor.

BEST MODE FOR CARRYING OUT THE INVENTION

A first embodiment of the present invention will be described in detail with reference to FIG.

In this example, the conveyor belt (1) is made of a plurality of layers of canvas to increase stiffness, for example, more than that used in conventional conveyor belts.

(2) is used as a central layer, and on both sides thereof, 100% by weight of rubber, 5 to 50 parts by weight of carbon black and 15 to 200 parts by weight of calcium carbonate according to the above-mentioned conventional technology. The rubber layers (3) and (4) obtained by vulcanizing the resulting rubber composition are polymerized, and further on the rubber layer (3), that is, the inner side of the conveyor belt on which the conveyed object is mounted. On the surface, for example, a cover rubber layer (5) made of a low friction resistance rubber disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2002-179231 is polymerized, re-vulcanized, and formed integrally with each other. ing.

Cover rubber layer (5) low friction rubber which is a material, the rubber component 100 parts by weight of natural rubber 8 0 wt%及Pibu 'Tajengomu 2 0 weight ^_0/0, a carbon black (Asahi Carbon Co. Manufactured and trade name: ASAHI # 70-NP) 4 5 parts by weight, stearic acid 3 parts by weight, zinc white 3.5 parts by weight, antioxidant 2,2,4-trimethyl-1-, 1,2-dihydroquinoline polymer (Manufactured by Seise Co., Ltd., trade name: Nonflex RD) 0.2 parts by weight, antioxidant (6C) N— (1,3-dimethinolebutyl) -1-N′-phenyl-1-p-phenylenediamine (large) Manufactured by Uchi Shinko Chemical Industry Co., Ltd., Trade name: Nocrack 6 C) 3 parts by weight, aloma oil 2 parts by weight, Io 1.4 parts by weight and vulcanization accelerator N-tertiary butyl 2-benzothiaziru 1 —Sulfenamide (Ouchi Shinko Chemical Co., Ltd., trade name: Noxeller NS) 1.6 parts by weight, and as a friction reducing agent, oleic acid amide (Nippon Kasei Co., trade name: Dia Mid O-200), stearic acid amide (Nippon Kasei Co., trade name: Amide AP-1) and / or polyalkylsiloxane (Toshiba Silicone Co., trade name: TSF451-10M) 0.1-1-15 It was prepared by blending parts by weight. At this time, the dynamic frictional resistance coefficient of the force-par rubber layer (5) to the iron plate should be maintained at 2.0 or less, while the other rubber layers (4) and (5) are usually around 2.2. Is preferred.

In the conveyor belt (1) having the above configuration, when used in a pipe conveyor device, even when the conveyor belt is rolled into a cylindrical shape, the frictional resistance of the contact surface at the overlapped portion of both side edges of the conveyor belt is reduced. Generation is suppressed. Therefore, despite the increased stiffness, no increase in frictional resistance was observed, no problem of motor power consumption due to the increase in resistance occurred, and no wear of the rubber layer on the contact surface was observed. . In this case, as a matter of course, the force-par rubber layer (5) comes into direct contact with the load to be loaded, but wear due to friction with the load is also reduced. +

Further, instead of providing the low friction resistance rubber outside the rubber layer (3), it can be provided outside the rubber layer (4) (the lower surface in FIG. 1). Also in this case, an increase in frictional resistance at the contact surface in the overlapped portion of the conveyor belt is suppressed. Further, when a low frictional resistance rubber layer is provided outside both of the rubber layers (3) and (4), the frictional resistance is greatly reduced.

FIG. 2 shows a second embodiment of the present invention. In this example, the conveyor belt (1) has the same core material (2) as in the first embodiment and rubber layers (3) and (4) provided on both sides thereof, and the rounded conveyor belt is On the side that comes into contact with the guide rollers when passing through the guide frame provided with a plurality of guide rollers, that is, on the lower surface side outside the rubber layer (4) in FIG. ) Is provided.

The low-loss rubber includes a natural rubber and a terminal-modified polybutadiene rubber as polymer components described in JP-A-2001-26670, and the weight ratio of the natural rubber and the terminal-modified polybutadiene rubber is such that the natural rubber end-modified. Polybutadiene rubber = 9 Rubber compositions ranging from 0/1 0 to 3700 can be used. According to the method described in the example of JP-A-2001-26670, 80 parts by weight of natural rubber (RSS4), terminal-modified polybutadiene rubber (terminal-modified polybutadiene rubber obtained by using an amide compound as a modifier) 20 parts by weight, carbon black 5 parts by weight of FEF, 3 parts by weight of stearic acid, 3.5 parts by weight of zinc white, 2 parts by weight of an antioxidant (manufactured by Daiko Shinko Chemical Co., Ltd .: Nocrack 6C), 2 parts by weight and 1 part by weight of a vulcanization accelerator NS were mixed, and the obtained rubber composition was vulcanized and molded by heating and pressing at 160 ° C. and 5 Okg / cm ² for 30 minutes. In this case, the physical property loss factor (tanS) in the temperature range of 0 ° to 40 ° C is 2 or more for the rubber layers (3) and (4), usually 2.1 to 2.5, It is preferable that the rubber layer (6) is determined to be 2 or less (the lower limit is about 0.04).

In this case, since the cover rubber layer (6) on the side that comes into contact with the guide roller is formed of low-loss rubber, the generation of resistance over the guide roller is suppressed. Therefore, despite the increase in rigidity, an increase in resistance at the contact portion with the guide roller is suppressed, and no problem regarding the power consumption of the motor is observed.

As a low-loss rubber, in addition to the above, a rubber composition obtained by blending 20 to 55 parts by weight of carbon black with a polymer consisting of 40 to 100 parts by weight of natural rubber and 60 to 0 parts by weight of polybutadiene rubber is equivalent. Can be used for

In the third embodiment of the present invention shown in FIG. 3, the conveyor belt (1) includes a core material (2) similar to that in the first embodiment and rubber layers (3) provided on both surfaces thereof. The cover rubber layer (6), which has the above (4) and is in contact with the guide rollers when the rolled conveyor belt (1) passes through the guide frame having a plurality of guide rollers, that is, the outer cover rubber layer (6) ) Is formed of low-loss rubber, and the outermost cover rubber layer (5) on the opposite side is formed of low-frictional-resistance rubber. In this case, the low loss rubber and the low friction resistance rubber used are the same as those used in the above-described embodiment.

In the conveyor belt having such a configuration, despite the increased rigidity, not only is the occurrence of resistance to get over the roller when coming into contact with the guide roller is suppressed, but also the overlapped portion of both side edges of the conveyor belt is formed. Since the increase in frictional resistance at the contact surface is also suppressed, problems related to motor power consumption are more completely solved. Can be turned off.

The cover rubber layer (5) is formed of low abrasion resistant rubber on only one or both sides, including areas where the conveyor belt (1) overlaps when the conveyor belt (1) is rolled into a cylinder. May be made of the same material as the conventional one.

ADVANTAGE OF THE INVENTION According to this invention, the increase of the frictional resistance in the contact surface in the overlap part of the both sides of a conveyor belt accompanying the increase in rigidity is suppressed, and simultaneously, the reduction of a belt crushing and motor power consumption is made permanent simultaneously. Can be achieved. In addition, the use of the low friction resistance rubber can be limited to a part of the rubber layer, so that the conveyor belt can be manufactured at low cost.

Claims

The scope of the claims

1. It is wound endlessly between a pair of pulleys that are spaced apart from each other. The winding portion of the pulley is flattened, and at least one of the forward path and the return path between the pulleys has an intermediate portion. A conveyor belt for a pipe conveyor, which is made to run in a substantially cylindrical shape and has a plurality of rubber layers laminated to each other, and at least one outermost rubber layer is a force-per-rubber layer. Characterized by a low frictional resistance rubber having a smaller dynamic frictional resistance than other rubber layers.

2. The conveyor belt for a pipe conveyor according to claim 1, wherein only a part of the cover rubber layer including an area which is overlapped with each other when rolled into a cylindrical shape is formed of low friction resistance rubber.

3. It is wound endlessly between a pair of pulleys that are spaced apart from each other. The winding portion of the pulley is unfolded flatly, and at least one of the outward path and the return path between the pulleys has a plurality of pulleys. A conveyor belt for a pipe conveyor in which an intermediate portion is made to run by being rounded into a substantially cylindrical shape by a number of guide frames in which guide rollers are arranged in a substantially annular or gutter shape, the belts being laminated together. A cover rubber layer having a plurality of rubber layers and at least an outermost rubber layer on the side in contact with the guide roller was formed of a low-loss rubber having a smaller physical loss factor (tan S) than other rubber layers. A conveyor belt for a pipe conveyor, characterized in that:

4. It is wound endlessly between a pair of pulleys spaced apart, and is flattened at the winding portion of the pulley, and a plurality of guide rollers are provided at least one of the outward path and the return path between the pulleys. A conveyor belt for a pipe conveyor in which an intermediate portion is made to run by being rounded into a substantially cylindrical shape by a number of guide frames arranged in a substantially annular or gutter-like shape. A cover rubber layer having a rubber layer and being at least the outermost rubber layer on the side in contact with the guide roller is formed of a low-loss rubber having a smaller physical loss factor (tan δ) than other rubber layers; A conveyor belt for a pipe conveyor, characterized in that a cover rubber layer, which is the outermost rubber layer on the opposite side, is formed of a low friction resistance rubber having a smaller dynamic friction resistance than other rubber layers. Les Bok

5. The conveyor belt for a pipe conveyor according to claim 1, wherein the coefficient of dynamic frictional resistance of the low frictional resistance rubber to the iron plate is 2.0 or less. '

6. The rubber composition according to claim 1, wherein the low friction resistance rubber is a rubber composition comprising a rubber component selected from a natural rubber and a synthetic rubber, and a friction modifier comprising an acid amide and / or a silicone oil. A conveyor vent for a pipe conveyor according to any one of Claims 4 and 5.

7. A low-loss rubber composition comprising: a) a rubber composition obtained by mixing 20 to 55 parts by weight of carbon black with respect to a polymer consisting of 40 to 100 parts by weight of natural rubber and 60 to 0 parts by weight of polybutadiene rubber; B) The polymer component contains natural rubber and terminal-modified polybutadiene rubber, and the weight ratio of natural rubber and terminal-modified polybutadiene rubber is natural rubber / terminal-modified polybutadiene rubber = 90 / lO to 30Z. The conveyor _c for a pipe conveyor according to any one of claims 3 and 4, or 5 or 6 dependent thereon, wherein the conveyor _c is selected from the group consisting of a rubber composition having a range of 70.

8. The conveyor belt for a pipe conveyor according to any one of claims 1 to 7, wherein a core material is provided at an intermediate portion of the plurality of rubber layers.

9. A conveyor belt is wound endlessly between a pair of pulleys spaced apart from each other, and the conveyor belt is unfolded flatly at the winding portion of the pulley, while the outward and return paths between the pulleys are arranged. In at least one of the pipe conveyor devices, a plurality of guide rollers are arranged in a substantially annular or trough-like shape, and the conveyor belt is run in a state of being rounded into a substantially cylindrical shape. A pipe conveyor device using the conveyor belt according to any one of claims 1 to 8.