JP5191642B2 - Conveyor belts and belt conveyors - Google Patents

Description

  The present invention relates to a conveyor belt and a belt conveyor.

  In recent years, conveyor belts have become larger and more powerful in order to increase the transport amount and to increase the distance, and power consumption during use has increased. Therefore, in order to reduce power consumption during use, a conveyor belt having a low running resistance is required.

  By the way, the conveyor belt has a center carrier roller having a horizontal axis on the transport side and an inclined axis arranged on both the left and right sides of the center carrier roller so that the loaded load does not slide down when the load is transported. The belt is used while being supported by a support means having left and right side carrier rollers and having both end regions in the direction perpendicular to the running direction of the conveyor belt, that is, the belt width direction, raised upward. There is a case.

  In order to reduce the running resistance, there is known a technique using rubber with a small loss coefficient for the back cover rubber layer based on the knowledge that a measure for reducing the roller overcoming resistance on the carrier side is effective (for example, Patent Documents). 1).

Further, when the core of the conveyor belt is a canvas, at least one central reinforcing core extending in the belt width direction central region and extending along the longitudinal direction is disposed on the upper side and / or the lower side of the core. Thus, there is also known one that reduces running resistance during running (see, for example, Patent Document 2).
JP2003-48609A (paragraphs 0013 and 0014) Japanese Patent Laying-Open No. 2004-18202 (paragraph 0011 and FIG. 2)

  However, with the technique described in Patent Document 1, traveling is not stable and meandering is likely to occur. On the other hand, in the technique described in Patent Document 2, since the core is made of canvas, there is a risk of warping. In addition, when the belt width is 1000 mm or less, it becomes difficult for the conveyor belt to follow the carrier roller. Furthermore, if the canvas insertion position (that is, the position where the canvas is embedded in the rubber) is not stable, meandering may occur.

  Therefore, the inventor, if the core is a canvas as in the technique described in Patent Document 2, even if a reinforcing core is provided in the central region in the belt width direction to reduce running resistance, the reinforcing core is at the end. If the steel cord that can handle almost 100% of the belt tension is used as the core body, the belt width direction central region is found. Even if the reinforcing canvas is partially provided, the belt tension can be handled in a well-balanced manner by the steel cord, and the present invention is based on the idea that the reinforcing canvas can be used only for reducing the running resistance.

  In order to confirm this, from the knowledge that the running resistance increases when the strain on the center carrier roller is increased, the relationship between the insertion position of the reinforcing canvas and the strain energy (running resistance) In a conveyor belt (belt width 900 mm), a reinforcing canvas was inserted into the back cover rubber layer over the entire belt width, and the insertion position was varied in the belt thickness direction to test the influence on running resistance. The result is shown in FIG.

  From the results shown in FIG. 6, it can be seen that by inserting the reinforced canvas over the entire width of the belt, the strain energy is reduced by about 30% compared to the case where the reinforced canvas is not inserted, and energy saving is ensured.

  However, if the reinforcing canvas is inserted over the entire width of the belt, the rigidity of the entire belt increases in the belt width direction, and no problem occurs when the belt width is large. However, when the belt width is 1000 mm or less, the horizontal axis is set on the transport side. If the belt is made to travel while being supported by a support means including a center carrier roller having the center carrier roller and left and right side carrier rollers having inclined axes arranged on the left and right sides of the center carrier roller, the belt does not follow the carrier roller and travels. It turned out to be difficult.

  Therefore, the inventor, in a conveyor belt having a steel cord having a belt tension of almost 100% as a core, when the belt width is 1000 mm or less and the belt width is small, the energy is reduced and distortion energy is reduced. Based on the results of investigations and FEM analysis results to achieve compatibility with the trough characteristics along the carrier roller, the distortion of the back cover rubber layer when getting over the center carrier roller is due to the steel cord and the center carrier roller belt. The inventors have invented a conveyor belt that is found in the central portion in the thickness direction and is provided with a reinforced canvas that suppresses deformation of this portion, thereby achieving both energy saving and trough properties.

  An object of this invention is to provide the conveyor belt which can aim at coexistence with energy-saving property and trough property.

The invention according to claim 1 includes a center carrier roller having a horizontal axis, and left and right side carrier rollers having an axis inclined so as to increase in height toward the outer side disposed on both left and right sides of the center carrier roller. A conveyor belt that travels while being supported by a support means, and has a belt width of 1000 mm or less, a core layer having a steel core as a core, and front and back cover rubbers laminated respectively on the front and back sides of the core layer An intermediate portion in the belt thickness direction and a belt width direction central portion that travels while being supported by the center carrier roller except for a portion supported by the side carrier roller in the back cover rubber layer. reinforcing fabric is inserted into, the reinforcing canvas, in the belt thickness direction, the back cover from the surface of the back cover rubber layer Characterized in that it is inserted to the depth corresponding to the range of 40% to 65% of the thickness of the beam layer. Here, the reason why the belt width is set to 1000 mm or less is that when the belt width exceeds 1000 mm, the restriction on the trough property becomes small.

  In this case, since the belt is supported at the center portion in the belt width direction that travels while being supported by the center carrier roller, the trough property that the belt follows each carrier roller is secured, and the belt thickness direction is intermediate. Since the reinforcing canvas is inserted into the portion, the deformation of the back cover rubber layer when it passes over the center carrier roller is suppressed, thereby reducing the running resistance. Therefore, both energy saving and trough properties can be achieved.

The reinforcing canvas is inserted in the belt thickness direction from the surface of the back cover rubber layer to a depth corresponding to a range of 40% to 65% of the thickness of the back cover rubber layer. At the time of overcoming the roller, distortion that easily occurs at the intermediate portion of the back cover rubber layer in the belt thickness direction between the steel cord and the center carrier roller is suppressed, which is advantageous in reducing running resistance.

A belt conveyor using the conveyor belt is configured as in the invention of claim 2 . That is, a conveyor belt comprising a core layer having a core as a steel cord and front and back cover rubber layers respectively laminated on the front and back sides of the core layer includes a center carrier roller having a horizontal axis and the center carrier. A belt conveyor that is disposed on both left and right sides of the roller and that is supported by support means having left and right side carrier rollers having an axis that is inclined so as to increase in height toward the outside, the conveyor belt comprising: The belt width is 1000 mm or less, and a belt thickness direction is a central portion of the back cover rubber layer that runs while being supported by the center carrier roller except for a portion supported by the side carrier roller , and in the belt thickness direction. reinforcing fabric in the intermediate portion is inserted in, the reinforcing canvas, in the belt thickness direction, the back cover Characterized in that it is inserted to a depth corresponding from the surface of the rubber layer to the range of 40% to 65% of the thickness of the back cover rubber layer.

  In this way, since the belt is supported at the central portion in the belt width direction while being supported by the center carrier roller, the trough property that the belt follows the carrier roller is secured, and the intermediate portion in the belt thickness direction is reinforced. Since the canvas is inserted, the back cover rubber layer is prevented from being deformed when the center carrier roller is passed over, thereby reducing running resistance.

  Since it comprised as mentioned above, since this invention is supported by the center part of the belt width direction which drive | works while being supported by the center carrier roller, the trough property that a belt follows each carrier roller can be ensured. On the other hand, since the reinforcing canvas is inserted in the intermediate portion in the belt thickness direction, the deformation of the back cover rubber layer when the center carrier roller gets over can be suppressed, and the running resistance can be reduced. Therefore, both energy saving and trough properties can be achieved.

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

  FIG. 1 is a perspective view showing a conveyor belt according to an embodiment of the present invention, and FIG. 2 is a view showing a relationship between the conveyor belt and rollers.

  As shown in FIG. 1, reference numeral 1 denotes a conveyor belt having a belt width of 1000 mm or less, and a core body layer 2 in which a steel cord 2a is inserted in a spiral shape into an adhesive rubber 2b as a core body, and the core body layer 2 The front and back cover rubber layers 3 and 4 are respectively laminated on the front and back sides.

  Examples of the material for the adhesive rubber of the core layer 2 and the rubber of the front and back cover rubber layers 3 and 4 include natural rubber, BR (polybutadiene rubber), SBR (styrene butadiene rubber), NBR (acrylonitrile butadiene rubber), Although materials used for conventional conveyor belts based on these blends can be used, the back cover rubber layer 4 has a low loss factor of viscoelastic properties and a low friction coefficient. It is preferable to use a loss coefficient rubber in that the running resistance when getting over the center carrier roller 12 can be reduced. For rubber, for example, reinforcing agents such as carbon black and silica, fillers such as calcium carbonate and talc, vulcanizing agents, vulcanization accelerators, plasticizers, anti-aging agents and processing aids are usually used. A rubber composition obtained by kneading the compounding agent can be used.

  Here, as an example, Table 1 shows a blending example of ordinary rubber and low loss coefficient rubber.

裏カバーゴム層４の、後述するセンタキャリアローラ１２にて支持されつつ走行するベルト幅方向の中央部位でかつベルト厚み方向の中間部位に補強帆布５が挿入されている。つまり、補強帆布５は、センタキャリアローラ１２にて支持される部分に挿入され、左右のサイドキャリアローラ１３，１４にて支持される部分には挿入されていない。また、センタキャリアローラ１２にて支持される部分であっても、その部分の端部付近は、左右のサイドキャリアローラ１３，１４にて支持されるために無理なく湾曲する必要があるので、補強帆布は埋め込まれていない。これによりトラフ性が確保される。

A reinforcing canvas 5 is inserted into the back cover rubber layer 4 at a central portion in the belt width direction and running while being supported by a center carrier roller 12 described later, and in an intermediate portion in the belt thickness direction. That is, the reinforcing canvas 5 is inserted into a portion supported by the center carrier roller 12 and is not inserted into a portion supported by the left and right side carrier rollers 13 and 14. Further, even if the portion is supported by the center carrier roller 12, the vicinity of the end portion of the portion needs to be bent without difficulty because it is supported by the left and right side carrier rollers 13 and 14. The canvas is not embedded. Thereby, trough property is ensured.

  Specifically, the reinforcing canvas 5 is a central portion in the belt width direction that travels while being supported by the center carrier roller 12, and from the surface (belt back surface) of the back cover rubber layer 4 to the back cover in the belt thickness direction. The rubber layer 4 is inserted in the vicinity of a depth corresponding to 50% of the thickness. Here, even if the reinforcing canvas is provided at a depth corresponding to the range of 40% to 65% of the thickness of the back cover rubber layer 4 in the belt thickness direction from the surface of the back cover rubber layer 4 (belt back surface), the belt It has been confirmed that this is the same as the case where it is inserted near the depth corresponding to 50% of the thickness of the back cover rubber layer 4 in the thickness direction.

  As the reinforcing canvas 5, for example, polyester fibers, nylon fibers, aramid fibers, cellulose fibers, cotton fibers, combinations of these, and the like that are usually used in conveyor belts are used. Needless to say, the reinforcement canvas 5 can be made by dipping an adhesive such as RFL (resorcin, formalin, latex) in advance from the viewpoint of adhesion to rubber.

  The conveyor belt 1 is configured to be driven to rotate by being wound between a drive roller and a driven roller (not shown). On the transport side, the conveyor belt 1 is supported by a belt support device 11 whose both side portions are lifted from the central portion and deformed into a concave shape as shown in FIG. The transported object is prevented from dropping from the belt. The belt support device 11 has a horizontal axis and supports a center carrier roller 12 that supports the central portion of the conveyor belt 1 in the belt width direction, and is inclined to the left and right sides corresponding to the center carrier roller 12. The left and right side carrier rollers 13 and 14 that support the left and right ends of the conveyor belt 1 in the belt width direction are provided.

  Subsequently, the result of testing the relationship between the canvas insertion position and the strain energy for the above-described conveyor belt (belt width 900 mm) is shown when the thickness of the back cover rubber layer is changed to 5 mm and 6 mm. A back cover rubber layer having a thickness of 5 mm is shown in FIG. 3 as Example 1, and a 6 mm thickness is shown in FIG. 4 as Example 2. Further, FIG. 5 shows as Example 3 a belt width of 750 mm and the thickness of the front and back cover rubber layers similar to that of Example 1.

  From FIG. 3 and FIG. 4, in the case of Example 2, there is a reduction effect of about 17% compared to the case where the reinforcing canvas is not inserted, and in the case of Examples 1 and 3, there is a reduction effect of about 15%. It can be seen that it is advantageous in securing the property. In the case of Example 2, the reinforced canvas has a depth corresponding to a range of 41% to 67% of the thickness of the back cover rubber layer 4 in the belt thickness direction from the surface (belt lower surface) of the back cover rubber layer 4. However, in the case of Examples 1 and 3, if the depth is equivalent to the range of 35% to 65%, the distortion energy reduction effect is not affected. I understood.

  Therefore, it can be seen that the thicker the back cover rubber layer, the more effective the strain energy is reduced, and depending on the belt width, the effect of reducing the strain energy is not so much affected.

  Therefore, if the reinforcing canvas is provided in the range of 40% to 65% of the thickness of the back cover rubber layer 4 in the belt thickness direction from the surface of the back cover rubber layer 4 (belt back surface), the back cover rubber in the belt thickness direction. It can be said that the effect of reducing strain energy can be obtained to the same extent as when the layer 4 is inserted in the vicinity of a depth of 50% of the thickness of the layer 4.

It is a perspective view which shows the conveyor belt which is one embodiment of this invention. It is a figure which shows the relationship between the said conveyor belt and a carrier roller. It is a figure which shows the relationship between a canvas insertion position and distortion energy about Example 1. FIG. In Example 2, it is a figure which shows the relationship between a canvas insertion position and distortion energy. It is a figure which shows the relationship between a canvas insertion position and distortion energy about Example 3. FIG. It is a figure which shows the relationship between a canvas insertion position and distortion energy about a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyor belt 2 Core body layer 2a Steel cord 3 Front cover rubber layer 4 Back cover rubber layer 5 Reinforcement canvas 11 Belt support device 12 Center carrier roller 13, 14 Side carrier roller

Claims (2)

While being supported by a support means comprising a center carrier roller having a horizontal axis, and left and right side carrier rollers having an axis inclined on the left and right sides of the center carrier roller so that the height increases toward the outside. A traveling conveyor belt,
The belt width is 1000 mm or less,
A core layer having a core as a steel cord, and front and back cover rubber layers respectively laminated on the front and back sides of the core layer,
Reinforcement canvas is inserted into the center part in the belt width direction and the middle part in the belt thickness direction of the back cover rubber layer that runs while being supported by the center carrier roller except for the part supported by the side carrier roller. And
The conveyor canvas is inserted in a depth corresponding to a range of 40% to 65% of the thickness of the back cover rubber layer from the surface of the back cover rubber layer in the belt thickness direction. belt. A conveyor belt comprising a core layer having a core as a steel cord and front and back cover rubber layers respectively laminated on the front and back sides of the core layer,
While being supported by support means having a center carrier roller having a horizontal axis and left and right side carrier rollers having an inclined axis arranged on both the left and right sides of the center carrier roller and increasing in height toward the outside. A traveling belt conveyor,
The conveyor belt has a belt width of 1000 mm or less, and a central portion of the back cover rubber layer that runs while being supported by the center carrier roller except a portion supported by the side carrier roller. In addition, a reinforcing canvas is inserted in an intermediate portion in the belt thickness direction, and the reinforcing canvas is in the range of 40% to 65% of the thickness of the back cover rubber layer from the surface of the back cover rubber layer in the belt thickness direction. A belt conveyor characterized by being inserted to a corresponding depth .

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