JP2007308213A - Curve conveyer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of sticking sound on a curve conveyor by a simple configuration. <P>SOLUTION: A curve belt 13 is stretched around a driving taper roller 11 and a driven taper roller 12 to form in a fan shape. A belt piece is stuck to an outer peripheral face of the driving taper roller 11 to provide irregular textures. A surface of the driven taper roller 12 is formed into a smooth surface. Coefficient of friction between the driven taper roller 12 and the curve belt 13 is set to be half of coefficient of friction between the driving taper roller 11 and the curve belt 13 or less. A shaft 11A of the driving taper roller 11 is connected with a motor 15 through a belt transmission device 14 to transmit rotary driving force. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a curved conveyor in which a curved belt is stretched using a tapered roller.

  A curve conveyor is known in which a curve belt is wound around a pair of taper rollers and the curve belt is stretched in a fan shape. In such a curved conveyor, since each tapered roller transmits a driving force to the belt, each tapered roller is in contact with the curved belt with a grip. However, in the curved conveyor, the inner and outer circumferential lengths of the actual curved belt stretched in a fan shape slightly differ from the inner and outer circumferential lengths defined by the tapered roller due to manufacturing errors of the tapered roller and the curved belt. Therefore, when the curved belt is driven while being firmly gripped by the taper roller, the belt is distorted by the inner and outer circumference errors and gradually accumulated. When the force due to the accumulated distortion exceeds the gripping force, a slip occurs between the belt and the taper roller, and a so-called stick sound is generated.

To solve this problem, one of the pair of taper rollers is a driving roller and the other is a driven roller. There has been proposed one that suppresses the generation of stick sound by setting the friction coefficient between the two to less than half (Patent Document 1).
JP 9-315532 A

  An object of the present invention is to suppress the generation of stick noise in a curve conveyor with a simpler configuration.

  The curved conveyor according to the present invention is a curved conveyor that stretches a curved belt using a tapered roller, and includes a driving tapered roller for transmitting a driving force to the curved belt, and a driven tapered roller that supports the curved belt with an idle function. It is characterized by preventing stick-slip phenomenon between the belt canvas and the surface of the drive taper roller due to the peripheral speed difference of the curved belt caused by the displacement due to the mutual position of the drive taper roller and the driven taper roller and the belt manufacturing accuracy. .

  For example, the surface roughness of the drive taper roller is increased to prevent stick-slip phenomenon between the belt canvas and the surface of the drive taper roller. At this time, the outer peripheral surface of the drive taper roller is provided with irregularities, the outer peripheral surface of the driven taper roller is a smooth surface, and the friction coefficient between the driven taper roller and the curve belt is half of the friction coefficient between the drive taper roller and the curve belt. The following is preferred.

  The concave / convex eyes are provided, for example, by sticking a concave / convex sheet having concave / convex eyes on the outer peripheral surface of the drive taper roller. The hardness of the uneven sheet is preferably harder than that of the curve belt.

  For example, resin coating or polyester coating is applied to the surface of the driven taper roller. The driven taper roller is made of metal or hard resin. Preferably, in the tapered roller, the friction coefficient with the smaller diameter and the friction coefficient with the larger diameter are changed (differentiated).

  As mentioned above, according to this invention, generation | occurrence | production of the stick sound in a curve conveyor can be suppressed with a simple structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view schematically showing an overview of a belt conveyor using a curved belt according to an embodiment of the present invention.

  In the curve conveyor 10 of the present embodiment, the drive taper roller 11 and the driven taper roller 12 are arranged so as to form a predetermined center angle. A curve belt 13 is wound around the drive taper roller 11 and the driven taper roller 12, and the curve belt 13 is stretched in a fan shape.

  The drive taper roller 11 and the driven taper roller 12 are rollers whose diameters become narrower toward the fan-shaped center of the curve conveyor 10, and the shaft 11A of the drive taper roller 11 is connected to the prime mover 15 by, for example, a belt transmission device 14, and the rotational force Is given. On the other hand, the driven taper roller 12 is attached to the conveyor body so as to be freely rotatable, and does not apply a driving force to the belt.

  FIG. 2 is a schematic side view of the drive taper roller 11. In the present embodiment, irregularities (for example, knurled eyes) are formed on the surface (outer peripheral surface) of the drive taper roller 11. That is, in this embodiment, for example, a knurling roller is used as the drive taper roller 11. On the other hand, in this embodiment, the surface of the driven taper roller 12 is subjected to, for example, resin coating or polyester coating, or the taper roller itself is made of metal or hard resin, and the outer peripheral surface of the driven taper roller 12 is a smooth surface. It is said. Further, in the present embodiment, by applying unevenness to the drive taper roller 11, the friction coefficient between the driven taper roller 12 and the curve belt 13 is set to be less than half of the friction coefficient between the drive taper roller 11 and the curve belt 13. Yes.

  As a result, a high torque necessary for the conveyance of the curve belt 13 can be obtained only by the grip force of the drive taper roller 11, and the driven taper roller 12 can be simply used as an idler. That is, since the curved belt 13 is not gripped by the driven taper roller 12, the belt distortion caused by the grip force of the drive taper roller 11 is immediately eliminated through the driven taper roller 12, so that the mutual position of the drive taper roller and the driven taper roller and the belt The generation of the circumferential speed difference of the curved belt caused by the deviation caused by the manufacturing accuracy is prevented, thereby preventing the occurrence of stick noise (stick-slip phenomenon) generated between the belt canvas and the surface of the drive taper roller. it can.

  Further, as shown in FIG. 2, the surface of the drive taper roller 11 is divided into, for example, a plurality of regions (for example, three regions) A1, A2, and A3 in the axial direction, and different irregularities may be given to each region. it can. Concave stitches with high grip force (high friction coefficient) are formed in order from the center side of the sector, that is, the narrower side (grip force of region A1> grip force of region A2> grip force of region A3). .

  In a curved conveyor, generally a centripetal force directed toward the center of the fan acts on the curved belt, and the belt shifts toward the center during driving. Accordingly, as shown in FIG. 1, a belt holding mechanism 17 for preventing a shift due to centripetal force is provided on the outer periphery of the normal curve belt. The belt holding mechanism 17 has a configuration for holding a bead provided on the outer peripheral portion of the curved belt using, for example, a roller.

  On the other hand, if the grip force on the center side of the drive taper roller 11 is set higher than the grip force on the outside as in the configuration described with reference to FIG. 2, it is possible to prevent the curve belt 13 from shifting to the center side. This reduces the need for a belt holding mechanism, which can be simplified or omitted.

  In addition, as shown in FIG. 3, for example, by attaching a sheet (for example, a belt piece) 16 having unevenness to the outer peripheral surface of the drive taper roller 11, the unevenness can be formed. As a result, it is possible to provide the drive taper roller 11 with unevenness (particularly, a plurality of different unevennesses) very easily. At this time, a belt that is harder than the curve belt 13 for conveyance is used for the concave-convex sheet 16 attached to the drive taper roller 11. Thereby, wear of uneven eyes can be prevented.

  As described above, according to the present embodiment, it is possible to suppress the generation of a stick sound with a simple configuration, and to reduce the need for a belt holding mechanism.

It is a top view which shows typically the external appearance of the belt conveyor using the curve belt which is one Embodiment of this invention. It is a typical side view of a drive taper roller. It is sectional drawing of the drive taper roller of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Curve conveyor 11 Drive taper roller 12 Driven taper roller 13 Curve belt 14 Belt drive 15 Motor | power_engine 16 Unevenness sheet | seat (belt piece)

Claims (8)

A curved conveyor that uses a tapered roller to stretch a curved belt,
A driving taper roller for transmitting a driving force to the curve belt;
A driven taper roller that supports the curved belt with an idle function;
A stick-slip phenomenon between a belt canvas and a surface of the drive taper roller due to a difference in peripheral speed of the curved belt caused by a deviation due to the mutual position of the drive taper roller and the driven taper roller and belt manufacturing accuracy is prevented. Curve conveyor.   The curved conveyor according to claim 1, wherein the surface roughness of the drive taper roller is increased to prevent the stick-slip phenomenon between the belt canvas and the surface of the drive taper roller.   The drive taper roller is provided with irregularities on the outer peripheral surface, the outer peripheral surface of the driven taper roller is a smooth surface, and the friction coefficient between the driven taper roller and the curve belt is between the drive taper roller and the curve belt. The curve conveyor according to claim 2, wherein the curve conveyor is less than half of the friction coefficient.   The curve conveyor according to claim 3, wherein the irregularities are provided by sticking an irregularity sheet having irregularities on an outer peripheral surface of the drive taper roller.   The curve conveyor according to claim 4, wherein a hardness of the uneven sheet is harder than a hardness of the curve belt.   The curve conveyor according to claim 1, wherein a resin coating or a polyester coating is applied to a surface of the driven taper roller.   The curved conveyor according to claim 1, wherein the driven taper roller is made of metal or hard resin.   2. The curve conveyor according to claim 1, wherein in the taper roller, a friction coefficient with a smaller diameter and a friction coefficient with a larger diameter are changed.

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