JPS6236210A - Method for detecting distortion of conveying belt in pipe conveyor - Google Patents

Abstract

PURPOSE:To detect distortion without contact and take a proper measure by forming an optically peculiar belt shape area along the longitudinal direction of a conveying belt and externally monitoring and detecting said belt shape area to detect any distortion. CONSTITUTION:An optically peculiar coating is coated in a longitudinally narrow belt shape on the outer face of nearly central part of the bottom part of a conveying belt 1, to form an optically peculiar belt shape area 2. When the belt 1 is travelling, this belt shape area 2 is monitored by a detecting means consisting of a light emitting element 3 and a light receiving element 4, presence of distortion is judged from changes in electromotive force of the light receiving element 4, and a distortion correcting device is operated to correct distortion. This construction enables non-contact detection and to carry out proper correction rapidly.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a pipe conveyor in which a flat belt is rolled upward into a pipe shape so that objects can be transported without scattering. This relates to a detection method.

[Conventional technology]

As schematically shown in FIGS. 3 and 4, between the rollers (21) and (22) disposed at predetermined positions at the front, rear and ends,
An endless belt-shaped rubber conveyor belt (23) is hung and rotated, and at least its upper forward path is passed through a large number of shape-retaining rollers (23).
According to 4), a pipe conveyor is known in which the object (26) to be conveyed is rolled up upward, and the object (26) introduced from a hopper (25) provided near the rear roller (22) is wrapped therein and conveyed. be.

[Problem that the invention seeks to solve]

In such a pipe conveyor, rollers (21)
(22), there may be slight differences in the dimensions or properties of each part of the conveyor belt (23) or the shape retaining roller (24).
), the conveyor belt (23) may be twisted due to uneven wear of the parts, accumulation of accuracy errors, etc. in each part.

As a result, the conveyor belt runs unsmoothly, and
The pipe conveyor itself usually does not have the ability to recover from this twisting, so the twisting gradually increases, and the blocked portion of the outgoing path, which was originally facing upwards, ends up facing sideways and further downwards.

As the conveyed object falls, an unreasonable load is applied to the conveyor belt, shape retaining rollers, etc., which accelerates their wear and tear.

In order to solve such problems, it is necessary to discover the twist at an early stage.
As described in Japanese Patent Publication No. 304, correction may be performed manually, or as described in Japanese Patent Application Laid-open No. 145709/1989,
Alternatively, as described in Japanese Unexamined Patent Publication No. 57-151508, it has been proposed to detect this torsion with a detection roller and correct it by electric or hydraulic means based on the detected torsion.

It is not practical to directly monitor the torsion of the conveyor belt, and even if a detection roller is placed in direct contact with the surface of the conveyor belt and the inclination of the detection roller is used to detect the torsion, the torsion is extremely small. Torsion is difficult to detect and
A considerable time delay is unavoidable, and the reality is that it is not possible to take appropriate corrective measures at the initial stage of twisting.

Furthermore, since the detection roller is constantly in contact with the conveyor belt, there is also a problem in its durability.

According to the present invention, even if a rolled conveyor belt is slightly twisted, this can be immediately detected using a simple, non-contact method, and appropriate measures can be taken to correct the twist. It is intended to be helpful.

[Means for solving problems]

In order to achieve the above object, according to the present invention, an optically specific band-like region is formed at a suitable location on the conveyor belt along its longitudinal direction, and the presence or absence of this band-like region is externally detected by a detection device. Accordingly, there is provided a method for detecting twisting of a conveyor belt in a pipe conveyor, which is characterized by detecting the presence or absence of twist in the conveyor belt. - [Embodiment] Fig. 1 is a schematic vertical cross-sectional view for illustrating the embodiment of the present invention. The optically specific band region (2) is formed by applying a paint having a specificity in a longitudinal band shape with a narrow width.

The paint may be one that reflects light well, one that absorbs light well, one that has a color that is easily distinguishable from the conveyor belt (1), or one that has a fluorescent color, or one that emits infrared rays when the temperature rises. , a belt with optical specificity is used compared to the conveyor belt (1).

Moreover, instead of this paint, a linear or granular colored object having the characteristics described above may be embedded in the conveyor belt (1) in the longitudinal direction.

Light from a light projecting element (3) is projected onto this optically specific band region (2) from a slightly oblique direction, reflected, and received by a light receiving element (4) such as a photocell.

From the change in the electromotive force of the light-receiving element (4), it is possible to know whether or not the optically singular zone (2) is in the correct position, in other words, whether or not the conveyor belt (1) is twisted.

Needless to say, in response to changes in the electromotive force of the light-receiving element (4), the above-mentioned information may be notified by activating an appropriate twist correction device or issuing an alarm.

The number of light emitting elements (3) and light receiving elements (4) is arbitrary, and by using a plurality of either or both, the range of torsion to be detected can be adjusted in size.

The formation position of the optically specific band-shaped region (2) on the conveyor belt (11) is also arbitrary; for example, it may be provided at the side edge portion that is the outer side when rolled into a pipe shape.

FIG. 2 shows another example of the present invention, in which a rounded conveyor belt (1) has an optically specific band made of, for example, quartz, which emits infrared rays when heated, in the center of the bottom outer surface of the rolled conveyor belt (1). A region (12) is formed.

This optically specific band (12) is heated by a heating element (13), and the infrared rays emitted from it are transferred to a detection element (14).
) is detected.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a main part for explaining the implementation procedure of the present invention. FIG. 2 is a diagram similar to FIG. 1 showing another example. FIG. 3 is a front view schematically showing a general pipe conveyor, and FIG. 4 is an enlarged vertical sectional view taken along the line IV-4V in FIG. 3. (1) Conveyor belt (2) Optical singular zone (
3) Light projecting element (4) Light receiving element (11) Conveyor belt (12) Optically specific zone (13) Heating element (14) Detecting element Figure 1 Figure 2

Claims (1)

[Claims] A unique optical band is formed along the longitudinal direction of the conveyor belt at a suitable location, and the presence or absence of this band is detected by a detection device from the outside, thereby detecting the presence or absence of twist in the conveyor belt. A method for detecting torsion of a conveyor belt in a pipe conveyor, characterized in that: