JP2000247421A - Device for curved conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for a curved conveyor belt preventing bending and breakage of an edge bar because repetitive stress in the outer peripheral direction is applied when an inner inclined face of the edge bar is pressed strongly in the outward direction by an upper roller so that the edge bar may be bent and broken in the device for the curved conveyor belt having a curve guide device. SOLUTION: This device for a curved conveyor belt is provided with a fan- shaped conveyor belt 1 which is suspended on guide rolls 12, 12' arranged by crossing shaft cores and is provided with an edge bar 2 continuous along outer peripheral parts 13 thereof and a curve guide device 14 which nips the edge bar 2 from below and above and guides it so that the conveyor belt 1 is fan- shaped. The curve guide device 14 is provided with a frame 5 provided along the outer peripheral part 13 of the conveyor belt 1, a plurality of upper rollers supported by the frame 5 liftably and rotatably, and a plurality of lower rollers which nip the edge bar 2 and are attached below the upper rollers. The shape of a cross section of the edge bar 2 is formed into a trapezoidal shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for a conveyor belt having a curved conveying path and used for a curved portion of the conveyor belt.

[0002]

2. Description of the Related Art A conventional device for a curved conveyor belt has a structure similar to that of the device for a curved conveyor belt according to the present invention, and will be described with reference to FIG. .

[0003] As shown in Figs. 2 (a) and 2 (b), an outline of a conventional conveyor belt device used for a bending section is a guide roll 1 arranged so that axes intersect.
2, a conveyor belt 1 having a fan shape (a plan view is a fan shape) as viewed from above with an ear bar attached along the outer peripheral portion 13, and a conveyor belt 1 sandwiching the ear bar from above and below. And a bending guide device 14 (frame 5 or the like) for guiding the ear rails so that each of them has a fan shape. This is because the outer peripheral portion 13 of the conveyor belt 1 cannot be sufficiently extended in a fan shape only by the guide rolls 12 and 12 ′, and there is a problem that the outer peripheral portion hangs or wrinkles. The guide rolls 12 or 12 'are driven by driving means (not shown).

[0004] As shown in the sectional view of FIG.
Is adhered as a continuous ridge having a substantially triangular cross section along the outer peripheral portion 13 on the upper surface (conveying surface) of the conveyor belt 1 suspended in a fan shape.

[0005] As shown in Fig. 3, the bending guide device 14 has a frame 5 (see also Fig. 2) arranged along the outer peripheral portion 13 and above the frame 5, and is supported by the frame 5, and the ear bar 2 '. A plurality of rotatable plurality of rotatable members which are capable of coming into contact with and separating from the inner inclined surface 3 ′ (refer to a surface facing the direction of the “Kaname” of the fan) and whose axis x is parallel to the inner inclined surface 3 ′. An upper roller 7 'and a support roller 6 for supporting the back side (lower surface) of the surface of the conveyor belt 1 on which the ear rail 2' is attached are provided.

[0006] The frame 5 is supported on a gantry (not shown) of the conveyor belt 1 along the outer peripheral portion 13 of the conveyor belt 1. The upper part of the frame 5 projects above the inner inclined surface 3 ′ of the ear bar 2 ′ of the conveyor belt 1. The upper roller 7 'is attached to the projecting portion of the frame 5 such that its axis x' is parallel to the inner inclined surface 3 'of the ear bar 2' so as to be able to contact and separate from the inner inclined surface 3 '. . The upper roller 7 'is the length of the conveyor belt 1.
Although individually designed according to the width or required strength, commercially available metal roller bearings are usually used. A lower roller 6 ', which is located below the upper roller 7' and supports the back surface of the conveyor belt 1 with the ear rail 2 'interposed therebetween, is attached to the frame 5 and cooperates with the upper roller 7'. Has the function of extending the outside.

[0007]

However, in the apparatus for a curved conveyor belt having the above-mentioned bending guide device, the tension of the conveyor belt working inward (in the direction of the sector "Kaname", arrow y 'in FIG. 3). The upper roller strongly presses the inner inclined surface of the ear rail outward in response to the force. As a result, in the conventional ear rail having a substantially triangular cross-sectional shape, the upper part of the ear rail is pushed and bent at a position where a force for pushing the outer peripheral portion (ear rail) outward by the upper roller is applied. On the forward side (upper side) of the belt and not in contact with the upper roller, or on the backward side (lower side), the external force is reduced and the bending is repeated, causing physical deterioration and destruction. Sometimes. Further, since the conveyor belt 1 is suspended at both ends by the guide roll, the upper part of the ear rail is strongly stretched on the guide roll, so that stress is applied and cracks are easily generated.

[0008] The present invention has been made in view of the above points, and it is an object of the present invention to provide an apparatus for a curved conveyor belt in which ear rollers are less likely to be degraded by an upper roller.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a curved conveyor belt device according to the present invention is suspended around a pair of guide rolls which are arranged so that their axes intersect with each other. A conveyor belt having a fan-shaped conveyor belt provided with continuous ear bars, and a bending guide device for guiding the conveyor belt into a fan shape by sandwiching the ear bars from above and below, wherein the bending is performed. A frame provided with a guide device along the outer periphery of the conveyor belt, a plurality of upper rollers supported by the frame and capable of coming into contact with and separating from the ear rail and rotatable; A plurality of lower rollers attached below the upper roller, wherein the ear rail is formed in a trapezoidal cross section.

In a conventional ear rail having a substantially triangular cross-sectional shape, the upper part of the ear rail is easily bent outward and broken by the force of pushing the outer peripheral portion (ear rail) outward by the upper roller. In the ear rail according to the present invention, the cross-sectional shape is substantially trapezoidal, the width of the upper portion where a load is applied is wide, and the upper portion does not bend while enduring the outward pressing force applied to the upper portion.
Therefore, it is possible to withstand running for a long time without the ear bars being crushed. Note that the trapezoidal cross-sectional inner side inclined surface needs to be flat, but the upper and outer peripheral side surfaces are not necessarily flat.

[0011] Further, by making the ear bar into a trapezoidal shape, the opposing force (rigidity) against the outward force is increased.
Since the ear bar can be designed softly, it can withstand repeated bending caused by being hung on the guide roll.

According to a second aspect of the present invention, there is provided a device for a curved conveyor belt, wherein an inner inclined surface having a cross-sectional shape of the ear rail is attached at an angle of 20 to 40 ° with respect to an upper surface of the conveyor belt. An axis is parallel to the inner inclined surface, and is supported by the frame so as to be able to contact and separate from the inner inclined surface and to be rotatable.

Since the cross section of the ear studs is trapezoidal and the angle of the inner inclined surface to the upper surface of the conveyor belt (also referred to as the inclination angle) is 20 to 40 °, the force for pushing the ear studs against the lower roller by the wedge effect is obtained. As a result, the frictional force between the conveyor belt and the lower roller increases, and the horizontal force applied to the ear rail is reduced despite the force applied inward by the weight of the conveyed object. Further, since the ear rail is strongly supported between the upper and lower rollers by the wedge effect, it does not come off. Further, since the inward force is reduced by friction with the lower roller, the thickness of the ear rail can be reduced,
When it is hung on a guide roll, it is easily bent, and the occurrence of cracks in the ear rail can be reduced. 2 tilt angles
If the angle is less than 0 °, the bite width of the ear rail fluctuates greatly due to a slight change in the gap between the upper and lower rollers, and the fluctuation of the belt width becomes large. When the angle exceeds 40 °, the inclination of the upper pulley is large and the portion of the conveyor belt protruding above the conveying surface becomes large (the conveying area is reduced). There is a problem that fatigue and refraction of the steel sheet increase.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for a curved conveyor belt according to the present invention.

FIG. 1 is a partially enlarged sectional view showing the bending guide device 14 and the outer peripheral portion 13. As shown in FIG. FIG. 2A is a plan view of the curved conveyor belt device of the present embodiment, and FIG.
(B) is a side view (partial cross section).

As for the outline of the curved conveyor belt device, as shown in FIG.
, The guide rolls 12, which are arranged horizontally across the axis,
12 ', the outer periphery 1 of the conveyor belt 1
An ear bar 2 continuous along 3 is provided. That ear 2
Is guided between the upper roller and the lower roller (details described later) of the bending guide device 14 so that the conveyor belt 1 has a fan shape.

The conveyor belt 1 is formed, for example, by laminating two layers of polyester canvas with polyurethane to form a core, and laminating a polyurethane sheet on the surface thereof to form a belt having a predetermined thickness (for example, 1.5 mm). It is punched in a fan shape, and both ends or a plurality thereof are joined in a fan-shaped ring shape to form a curved conveyor belt having a predetermined length. The joining method is selected depending on the use of the conveyor device such as a finger method and an overlap method. This conveyor belt 1
Guide rolls 12, 1 arranged in a fan shape across the axis
2 ', the forward transport side and the return travel side approach each other vertically and run in the opposite direction (drive means not shown).

On the upper side surface (transport surface) of the outer peripheral portion 13 of the conveyor belt 1, a continuous ear bar 2 having a trapezoidal cross section is provided.
Is attached. As shown in the cross-sectional view of FIG. 1, the ear bar 2 has a flat portion (including a gentle protrusion) at the top of the cross section, the bottom portion is adhered to the surface of the conveyor belt 1, and the inner inclined surface 3 is The upper surface of the conveyor belt 1 is inclined at an angle θ. θ ranges from 20 to 40 °. The outer side wall of the ear bar 2 (side wall facing the frame 5) is vertical in this embodiment, but may be inclined.
Further, the ear bar 2 is an elastic body that can withstand repeated bending,
A material (polyurethane, soft vinyl chloride, or the like) similar to the cover material of the conveyor belt 1 is often used, and is adhered or physically attached to the outer peripheral portion 13.

As shown in a partial cross-sectional view of FIG. 1, the bending guide device 14 includes a lower roller 6 and a conveyor belt at the upper end of a lower roller 6 on a frame 5 (see FIG. 2A) arranged along the outer peripheral portion 13. 1, which is in contact with the lower surface of the outer peripheral portion 13, and is rotatably supported with its axis horizontal and the upper roller 7 is inclined above the lower roller 6 so that the axis of the upper roller 7 is inclined inside the ear bar 2. It is parallel to the surface 3 and is rotatably supported on the inner inclined surface 3 so as to be able to contact and separate therefrom (a lifting mechanism is not shown).
The frame 5 is supported by a gantry (not shown) that supports the conveyor belt 1, and the upper portion of the frame 5 approaches the outer peripheral portion 13 of the conveyor belt 1 and stands vertically.

When starting the transporting operation by the curved conveyor belt apparatus, the peripheral end 13 of the conveyor belt 1 is placed on the lower roller, the upper roller 7 is lowered, and the lower end of the upper roller is placed in the ear. It comes into contact with the inner inclined surface 3 of the crosspiece 2. When the conveyor belt 1 travels in this state, the upper roller 7
Urges the inner inclined surface 3 of the ear bar 2 in the outer peripheral direction to stop the inward force due to the tension of the conveyor belt, and the conveyor belt 1 is spread in a fan shape and travels. Prevent problems such as wrinkles and looseness.

Since the cross section of the ear bar 2 has a trapezoidal shape, it does not bend even when urged in the outer circumferential direction by the upper roller 7, so that bending, cracking, and the like due to bending fatigue are prevented.

The lower roller 6 supports the ear rail 2 from below, thereby preventing the force of the upper roller 7 for expanding the conveyor belt 1 from being eliminated by the ear rail 2 escaping downward. . At the same time, there is an effect of preventing the conveyor belt 1 from being pulled inward by the frictional force between the lower surface of the conveyor belt 1 and the surface of the lower roller 6. Therefore, by fitting the elastic body to the outer peripheral edge of the lower roller 6, it is possible to prevent the back surface of the outer peripheral portion of the conveyor belt 1 from being damaged and to improve the frictional force with the back surface of the conveyor belt 1. is there.

The effects of the ear bar 2 and the bending guide device 14 according to the present invention were confirmed by a pull-out test.

In the conveyor belt sample of the embodiment, as shown in FIG. 1, an ear bar 2 having a trapezoidal cross section is attached to the upper surface of the conveyor belt 1 and cut in the width direction of the conveyor belt 1 so as to have an end portion. An elongated material piece having an earpiece 2 was prepared. The dimension of the cross-sectional shape of the ear bar 2 is the base width w = 20.
mm, upper width v = 10 mm, height h = 10 mm, angle θ =
30 °, the thickness of the conveyor belt 1 = about 1.5 mm.

The test method is as follows. The outer peripheral portion 13 (ear rail 2) of the conveyor belt sample is placed on the same roller as the lower roller 6 of the bending guide device 14 of the present invention, and then the upper roller of the bending guide device 14 is continued. 7, the roller x having its axis x parallel to the inner inclined surface 3 of the ear bar 2 is fixed in contact with the inner inclined surface 3, and the conveyor belt 1 is pulled out in the direction of the arrow y. Measure the pull-out force.

As a comparative example, an ear bar 2 'having the conventional structure shown in FIG. 3 was attached to the upper surface of the conveyor belt 1 to prepare a data piece similar to that of the example. The cross section of the ear bar 2 ′ is a substantially equilateral triangle having a height h ′ = 10 mm and a base width w ′ = 13 mm, and the thickness of the conveyor belt 1 is about 1.5 mm. The test method used was the same as that used in the examples.

As a result of the above test, the required pulling force is as follows.

Example = 40 kg Comparative Example = 25 kg Further, a bending test described below was conducted to compare the degree of deterioration such as cracking caused by the conveyor belt 1 being repeatedly hung by the guide rolls 12 and 12 ′. Was.

As shown in FIG. 4, the test sample of the embodiment is a sample in which an ear bar 2 having the same sectional shape as that used in the pull-out test is attached to an elongated conveyor belt 1 '(width = 50 mm). The bar 2 was placed outside on a test pulley 15 having an outer diameter of 100 mm, and a bending test was repeated by applying a tension w = 50 kg to observe the number of times of bending and the surface condition.

In the comparative example, a bending test was carried out on a material provided with an ear bar 2 'having the same cross-sectional shape (substantially equilateral triangle) as that used in the pull-out test in the same manner as in the example.

As a result of the bending test, in the example, no crack was generated 50 million times, and in the comparative example, the crack was generated 10 million times.

As described above, the examples exhibit excellent effects on the pull-out resistance and the bending resistance as compared with the comparative example.

[0033]

As is apparent from the above description,
The device for a curved conveyor belt of the present invention has an improved service life and an improved running position accuracy in the outer peripheral portion by improving the cross-sectional shape of the ear rail and the bending guide device.

In the curved conveyor belt device according to the first aspect of the present invention, the cross-sectional shape of the ear rail is trapezoidal, so that the ear rail is bent outward when the conveyor belt is running, and comes off the bending guide device, so that the conveyor belt is disengaged. Prevents the belt from snaking or wrinkling. Further, the bending resistance is improved by softening the ear bar.

In the curved conveyor belt apparatus according to the second aspect, the pressing force of the upper roller against the lower roller is increased by setting the angle at which the inner inclined surface of the ear rail intersects the upper surface of the conveyor belt at 20 to 40 °. As a result, the frictional force between the conveyor belt and the lower roller increases, and the pull-out resistance can be increased.

[Brief description of the drawings]

FIG. 1 is an enlarged partial cross-sectional view showing an ear cross section of a device for a curved conveyor belt according to the present invention.

2 (a) is a plan view (partially omitted) of an apparatus for a curved conveyor belt according to the present invention, and FIG. 2 (b) is an A of FIG. 2 (a). FIG. 4 is a cross-sectional view (A is omitted) of a bending guide.

FIG. 3 shows a conventional conveyer belt apparatus for a curved conveyor belt, in which a lug 2 ′, a lower roller 6, and an upper roller 7 ′ of a conveyor belt 1 are provided.
3 is an enlarged partial cross-sectional view illustrating the relationship of FIG.

FIG. 4 is a perspective view showing the concept of a bending tester.

[Explanation of symbols]

 1: Conveyor belt 2: Ear bar 3: Inside inclined surface 5: Frame 6: Lower roller 7: Upper roller 12: Guide roll 13: Outer peripheral portion 14: Bending guide device

Claims (2)

[Claims] 1. A fan-shaped conveyor belt suspended by a pair of guide rolls arranged with their axes crossing each other and provided with a continuous ear rail along an outer peripheral portion, and sandwiching the ear rail from above and below. A curved conveyor belt device having a bending guide device that guides the belt so as to have a fan shape when viewed from above, and a frame provided with the bending guide device along an outer peripheral portion of the conveyor belt. A plurality of upper rollers supported by the frame and capable of coming into contact with and separated from the ear rail, and rotatable; and a plurality of lower rollers mounted below the upper roller with the ear rail interposed therebetween. An apparatus for a curved conveyor belt, wherein the cross section of the ear bar is formed in a trapezoidal shape. 2. An inner inclined surface having a cross-sectional shape of the ear bar is attached at an angle of 20 to 40 ° with respect to an upper surface of a conveyor belt, and a rotation axis of the upper roller is parallel to the inner inclined surface. The curved conveyor belt device according to claim 1, wherein the frame is rotatably supported on the frame so as to be able to contact and separate from an inner inclined surface thereof.