JP2006273487A - Conveyor belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyor belt used for reinforcement of fiber cords without largely increasing cost and bending rigidity, that is, a flexible conveyor belt having large strength and suitably used for transportation of heavy objects, such as for quarrying and transportation of earth and sand. <P>SOLUTION: This conveyor belt 1 comprises synthetic fiber. In this conveyor belt 1, an reinforcement cord layer 4 with a tyre fabric structure having 50 to 95% of arrangement density D of warp cords and at least one ply or more over the overall width is arranged such that the longitudinal direction of the conveyor belt 1 and the cord arrangement direction are parallel with each other. The arrangement density D of the warp cords is represented by an expression: arrangement density D of the warp cord (%) =ä(n×a)/b}×100. In this expression, a represents the diameter (mm) of the warp cords, b represents the overall width (mm) of the reinforcement cord layer 4 with the tyre fabric structure, and n represents the number of the warp cords included in the overall width of the reinforcement cord layer 4 with the tyre fabric structure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a conveyor belt reinforced with a synthetic fiber cord.

  Conventionally, as a conveyor belt, a structure in which a rubber layer is reinforced with fiber yarns is known, but a typical structure example of what has been used as a reinforcing fiber yarn is a canvas structure, and a core body Various fabrics including plain woven fabric were used for reinforcement.

  However, in order to increase the longitudinal strength for the woven fabric, it is necessary to increase the strand diameter of the constituent yarns and cords. As a result, the thickness of the woven fabric is increased, which is caused by the conveyor belt. As a result, the bending rigidity is increased, and as a result, the necessary driving force of the conveyor belt is increased, resulting in inconvenience.

  In particular, if the back surface of the belt is coated in order to reduce the driving force, there is a problem that slipping occurs due to the further increase in rigidity.

Conventionally, various proposals have been made to use a textile woven fabric or a suede woven fabric such as canvas to reinforce the conveyor belt (Patent Documents 1-5), but the bending rigidity of the entire conveyor belt is too large to drive. There were problems such as increased power and increased costs due to the use of fiber cords.
JP 2000-344320 A JP 11-349119 A Japanese Patent Laid-Open No. 11-227919 Japanese Patent Laid-Open No. 10-310211 Japanese Utility Model Publication No. 5-64112

  The object of the present invention is to use a fiber cord for reinforcement in view of the above-described points, but it does not cause a large cost increase and does not increase bending rigidity so much, that is, a conveyor belt. An object of the present invention is to provide a conveyor belt that is soft and has a high strength and that is suitably used for transporting heavy objects such as quarrying and sediment transport.

The conveyor belt of the present invention that achieves the above-described object has the following configuration (1).
(1) Conveyor belt comprising at least one ply over the entire width of a reinforcing cord layer having a suede woven structure made of synthetic fiber and having an arrangement density D of warp yarn cord expressed by the following formula (a) of 50 to 95% A conveyor belt, characterized in that the longitudinal direction and the code arrangement direction are arranged and used in parallel.

here,
Warp yarn cord arrangement density D (%) = {(n × a) / b} × 100 Expression (a)
a: Diameter of the warp yarn cord (mm)
b: Full width (mm) of the reinforcing cord layer having a suede woven structure
n: Number of warp yarn cords included in the full width of the reinforcing cord layer having a suede woven structure

In addition, the conveyor belt according to the present invention preferably has the following configurations (2) to (6).
(2) The conveyor belt according to (1), wherein the warp yarn cord arrangement density D is 70 to 90%.
(3) A fiber reinforced layer having a plain woven fabric or a woven fabric structure is further provided at least between the front cover rubber layer and the reinforcing cord layer having the woven structure according to (1). The conveyor belt as described in (1) or (2).
(4) A plain woven or suede woven fiber reinforcing layer provided between the front cover rubber layer and the reinforcing cord layer of the suede woven structure according to claim 1, wherein the warp yarn direction is ± The conveyor belt according to (1), (2) or (3), wherein the conveyor belt is provided with an angle of 15 ° or less.
(5) Further, a reinforcing cord layer having a suede woven structure is arranged within 25% of the total width from both ear ends toward the center, respectively (1), (2), ( 3) or conveyor belt as described in (4).
(6) The above (1), (2), (3) or (4) is characterized in that a reinforcing cord layer having a suede woven structure is disposed only within the width of 40% of the entire width only in the center in the horizontal direction. The conveyor belt described.

  According to the present invention, although the fiber cord is used for reinforcement, it does not cause a large cost increase, and the bending rigidity does not increase so much. A conveyor belt that can be suitably used for transportation of heavy objects such as transportation can be provided.

  Hereinafter, the conveyor belt of the present invention will be described in more detail.

  The conveyor belt of the present invention comprises at least one ply of a reinforcing cord layer having a suede woven structure made of synthetic fiber and having a warp yarn cord arrangement density D represented by the following formula (a) of 50 to 95% over the entire width. The conveyor belt longitudinal direction and the cord arrangement direction are arranged and used in parallel.

Here, warp yarn cord arrangement density D (%) = {(n × a) / b} × 100 (Equation (a))
a: Diameter of the warp yarn cord (mm)
b: Full width (mm) of the reinforcing cord layer having a suede woven structure
n: Number of warp yarn cords included in the full width of the reinforcing cord layer having a suede woven structure

  FIG. 1 is a schematic model explanatory diagram for explaining an example of the structure of the conveyor belt of the present invention. The conveyor belt 1 of the present invention has a front cover rubber layer 2 and a back cover rubber layer 3, and the front cover Between the rubber layer 2 and the back cover rubber layer 3, the reinforcing cord layer 4 having a suede woven structure in which the arrangement density D of the warp yarn cord represented by the formula (a) is 50 to 95% It is.

  FIG. 2 is a perspective view of a reinforcing cord layer 4 having a suede woven structure for explaining the above formula (a), where 5 is a warp yarn cord, a is a diameter (mm) of the warp yarn cord 5, and b is The total width (mm) of the reinforcing cord layer having a suede woven structure, and n is the number of warp yarn cords (lines) included in the entire width b of the reinforcing cord layer 4 having a suede woven structure.

  In the present invention, the “sudare woven structure” means a woven structure in which warp yarns occupy most of the whole and no weft yarns exist as a woven yarn component structure as in sudare. Is a weaving structure in which weft yarns having a strength of 1% or less and an arrangement density of 0.5% or less are woven with warp yarns, and there is almost no weft yarn.

  The warp yarn cord arrangement density D is preferably 70 to 90%.

  In the present invention, it is important that the warp yarn cord 5 is made of a synthetic fiber, among which a strength of 100 to 1000 N / piece made of a polyamide fiber yarn, a polyester fiber yarn or an aramid fiber yarn, and a thickness of 0.5 to 2 mm. It is preferable to use a warp yarn cord such as. More preferably, the strength is 200 to 500 N / piece and the thickness is 0.8 to 1.6 mm.

  In the conveyor belt of the present invention, adjacent cords in the reinforcing cord layer of the weave structure have an appropriate gap, and the rubber of the front cover rubber layer 2 and the rubber of the back cover rubber layer 3 pass through the gap between the cords. It constitutes a state of being connected to the top and bottom, and brings out a well-balanced bending rigidity, flexibility and good strength.

  It is important for the reinforcing cord layer of the Sudare weave structure to be disposed over the entire width of the conveyor belt in order to obtain the desired effect of the present invention over the entire width of the conveyor belt. The effect can be obtained if the number of plies is at least one. There are some points that change depending on the thickness of the cord, but if you increase the number of plies too much, there are disadvantages in terms of loss of flexibility and manufacturing cost, so one layer (one ply) It is practical to have about 3 layers (3 plies).

  In the conveyor belt of the present invention, by further providing a fiber reinforced layer of a plain woven fabric or a woven fabric structure between at least the front cover rubber layer and the reinforced cord layer of the woven fabric structure satisfying the above-described formula (a). What is further reinforced mainly in the horizontal direction is preferable because the strength is well balanced in the conveyor belt vertical direction (conveyor belt longitudinal direction) and the conveyor belt horizontal direction (conveyor belt width direction).

  Furthermore, more preferably, between the front cover rubber layer and the reinforcing cord layer of the suede woven structure satisfying the above-described formula (a), and between the back cover rubber layer and the suede woven structure satisfying the above-described formula (a). It is sufficient to provide a fiber reinforced layer having a plain woven or suede woven structure between the reinforcing cord layers, that is, on the upper and lower surfaces sandwiching the reinforcing cord layers.

  The fiber reinforced layer 6 having a plain woven or suede woven structure for reinforcing in such a horizontal direction has an angle within ± 15 ° with respect to the conveyor belt width direction as shown in the model in FIG. It is preferable to be provided because the reinforcement in the horizontal direction can be effectively performed.

  Further, preferably, as shown in FIG. 4, a reinforcing cord layer 7 having a suede woven structure is disposed at a location within 25% of the entire width from both ear ends toward the center, mainly in the vertical direction. Further reinforcement is preferable. Since the conveyor belt with this structure is reinforced at the ends, cracks and breaks at the ends can be prevented well, and the strength near the ends of both ears is high. There is merit such as being able to enlarge.

  Further, preferably, as shown in FIG. 5, it is preferable that the reinforcing cord layer 7 having a suede woven structure is disposed only in the central portion in the horizontal direction within 40% of the total width, and further reinforced mainly in the vertical direction. . Conveyor belts with this structure have high strength near the center and improved overall load resistance due to reinforcement at the center, and are particularly suitable for belt conveyor lines where the impact of transported goods is large. There are advantages such as a large roller pitch.

  The conveyor belt of the present invention is heated under pressure by interposing a required number (number of layers) of reinforcing cord layers having a suede woven structure coated with adhesive rubber between two unvulcanized cover rubber layers, one upper and one lower layer, for example. Then, it can be manufactured by a method such as vulcanization adhesion integration.

  The rubber material of the cover rubber is not particularly limited, and rubbers such as NR, BR, SBR, NBR, EPR, or blended rubbers thereof can be used depending on the application. In the present invention, the reinforcing cord layer having a suede woven structure is preferably subjected to an adhesive liquid treatment in order to adhere the front cover rubber layer, the back cover rubber layer, and the reinforcing cord layer to each other.

  In the conveyor belt according to the present invention, the thickness of the reinforcing layer is generally reduced, and the bending rigidity is appropriately reduced, so that the drive energy can be reduced.

  In addition, the belt is less stretched and deformed during driving, and the adjustment work can be simplified.

FIG. 1 is a schematic model diagram for explaining a structural example of a conveyor belt according to the present invention. FIG. 2 is a perspective view of the reinforcing cord layer 4 having a suede woven structure for explaining the formula (a). FIG. 3 is a schematic model diagram for explaining a case where a fiber reinforced layer having a plain woven or suede woven structure is additionally provided to reinforce in the horizontal direction. FIG. 4 is a schematic diagram for explaining a case where a reinforcing cord layer having a suede woven structure is arranged at a location within 25% of the entire width from both ear ends toward the center, and further reinforced mainly in the vertical direction. It is a model figure. FIG. 5 is a schematic model diagram for explaining a case in which a reinforcing cord layer having a suede woven structure is disposed within 40% of the entire width only at the center in the horizontal direction, and further reinforced mainly in the vertical direction.

Explanation of symbols

1: Conveyor belt 2: Front cover rubber layer 3: Back cover rubber layer 4: Reinforcement cord layer of Sudare woven structure 5: Warp yarn cord 6: Fiber reinforcement layer of plain or Sudare woven structure 7: Reinforcement cord of Sudare woven structure Layer a: Warp yarn cord diameter (mm)
b: Full width (mm) of the reinforcing cord layer having a suede woven structure
n: Number of warp yarn cords included in the full width of the reinforcing cord layer having a suede woven structure

Claims (6)

A reinforcing cord layer having a suede woven structure made of synthetic fibers and having a warp yarn cord arrangement density D represented by the following formula (a) of 50 to 95% is at least one ply over the entire width, A conveyor belt, wherein the belt is arranged so as to be parallel to the cord arrangement direction.
Here, warp yarn cord arrangement density D (%) = {(n × a) / b} × 100 Equation (a)
a: Warp yarn cord diameter (mm)
b: Full width (mm) of the reinforcing cord layer having a suede woven structure
n: Number of warp yarn cords included in the full width of the reinforcing cord layer with a weave structure   The conveyor belt according to claim 1, wherein the warp yarn cord has an arrangement density D of 70 to 90%.   3. A fiber reinforced layer of a plain woven fabric or a woven fabric structure is further provided at least between the front cover rubber layer and the reinforcing cord layer of the woven fabric structure according to claim 1. The conveyor belt described.   The fiber reinforced layer of plain woven fabric or suede woven structure provided between the front cover rubber layer and the reinforcing cord layer of suede woven structure according to claim 1, the warp yarn direction is within ± 15 ° with respect to the conveyor belt width direction The conveyor belt according to claim 1, wherein the conveyor belt is provided with an angle of   5. A conveyor belt according to claim 1, further comprising a reinforcing cord layer having a suede woven structure within a width of 25% of the entire width from both ear ends toward the center. .   The conveyor belt according to claim 1, 2, 3 or 4, further comprising a reinforcing cord layer having a suede woven structure within a width of 40% of the entire width only in the central portion in the transverse direction.

Images