JPH07157051A - Capacity measuring device for conveyed object on belt conveyor - Google Patents

Abstract

PURPOSE:To heighten the accuracy further when capacity of a conveyance material is measured by measuring continuously a cross-sectional shape of a conveyed object surface by a light cutting method. CONSTITUTION:Slit light 13 is radiated in the width direction to a surface of a belt conveyor 10, and light receiving units 14a and 14b respectively composed of a single CCD camera are placed obliquely upward in front and in rear of the radiating position, and when reflected light to either one light receiving unit 14a is intercepted, operation is backed up by the other light receiving unit 14b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the capacity of a belt conveyer used for measuring the capacity of excavated and unloaded soil during excavation of a shield tunnel, for example.

[0002]

2. Description of the Related Art Conventionally, there are an ultrasonic method, a spot laser method, or a slit laser method as a method for measuring the capacity of an object continuously conveyed on a belt conveyor.

In the ultrasonic system and the spot laser system, an ultrasonic length measuring device or a laser beam length measuring device is placed above the belt conveyor, and the heights of a plurality of points in the width direction of the conveyed object surface are measured by these. The method is to measure the cross-sectional shape under the assumption that the surface of the transported object connecting each point is continuous, and multiply it by the transportation speed to obtain the transportation capacity. The sound wave reflection angle has a wide directivity angle,
The distance of the shortest part of the sound wave emission angle by one sensor is measured. Therefore, if there is a tilted portion within the directivity angle of one sensor, the shortest portion of the tilted portion is measured. As a result, the accuracy of measuring the volume of the transported object is reduced. In addition, even in the laser beam system, when used for belt conveyors with different shapes, it is necessary to install many laser beam length measuring devices and improve the resolution.
It is not practical as a highly accurate capacitance measuring device.

On the other hand, in the slit laser system, as shown in FIG. 4, the slit laser 3 emits slit light 3a in the width direction from directly above the surface of the conveyed product 2 on the belt conveyor 1.
And the reflected light 3b is received by a light receiver 5 composed of a CCD camera to measure the cross-sectional shape of the surface of the conveyed object
The cross-sectional shape of the conveyed object 2 is continuously measured based on this and the belt conveyor surface shape data in the non-conveyed state, and this is multiplied by the conveying speed to obtain the conveying capacity (for example, Japanese Patent Laid-Open Publication No. 6-61).
2-298723).

[0005]

The slit laser method is more advantageous than the ultrasonic method or spot laser method described above.
Although a highly accurate measurement value can be obtained, since the slit light in the width direction is applied to the surface of the conveyed product and the cross-sectional shape curve is directly detected by the reflected light, the light receiver 5 is
As shown in FIG. 3, it is necessary to receive the reflected light from the transport slit light irradiation position obliquely above it, and the smaller the inclination angle α, the smaller the error. On the other hand, when the inclination angle α is small, a large convex portion 6 is formed on the surface of the conveyed object in the conveying direction.
If there is, reflected light is blocked by the convex portion 6 as shown in FIG. 5, and measurement becomes impossible. In order to eliminate this, the leveling device 7 for eliminating large irregularities on the surface of the conveyed product 2 is required.

However, generally, there are various types of excavated soil excavated by shield tunnel excavation, such as cohesive soil, gravel soil, and stone-mixed soil, and when the belt conveyor is conveyed, the surface of the excavated soil is severely uneven. It is often difficult to smooth the surface even with a leveling device. Therefore, there is a problem that the cross-section cannot be detected in many cases due to the shadow of the convex portion.

In view of such a conventional problem, the present invention is a capacity measuring apparatus for a belt conveyor conveyed object which can perform high precision measurement without performing another smoothing treatment on the conveyed object surface in the slit laser system. The purpose is to provide.

[0008]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
Irradiate the slit light directed to the width direction of the belt conveyor by the slit light irradiator with respect to the conveyed object conveyed on the belt conveyor, receive the reflected light on the surface of the conveyed object with the light receiver, and by the light cutting method In a belt conveyor conveyed object capacity measuring device for continuously detecting the sectional shape of the conveyed object and continuously measuring the conveyed object capacity by the sectional shape and the conveyor speed, the slit light irradiation position is in the center, and the conveyor conveyance is performed. A separate light receiver is installed diagonally above and in front of and behind the direction side, and the cross-sectional shape of the conveyed product is continuously detected by both the light receivers.

[0009]

In the apparatus of the present invention, the cross-section curve of the surface of the conveyed object is directly detected by receiving the reflected light of the slit light emitted in the width direction of the surface of the conveyed object on the belt conveyor by the light receiver. , By this, the cross-sectional area of the transported object is continuously calculated, and the capacity can be obtained by multiplying this by the transportation speed.
If one of the two light receivers has a missing cross-section curve, that is, if the reflected light is blocked by the convex portion and does not reach, it is always correct by complementing each other with the cross-sectional curve data from the other light receiver. The cross-section curve is detected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 10 is a belt conveyor, and 11 is a conveyed material such as tunnel excavated soil conveyed on the conveyor. Three slit light irradiators 12, 12, 12 are provided directly above the belt conveyor 10, and each slit light irradiator 12 forms one laser slit light in the entire width in the direction orthogonal to the conveyance direction of the belt conveyor 10. Thirteen
Is being irradiated.

With the irradiation position of the laser slit light 13 as the center, C is directed toward the position of the irradiated laser slit light 13 at diagonally upper positions in front of and behind the conveyance direction side.
Light receivers 14a and 14b each composed of a CD camera are provided. The light receivers 14a and 14b reflect the reflected light 1 on the surface of the conveyed object irradiated by the laser slit light 13a.
3b is captured as a curved image. Based on this image data and the previously measured curve image data of the surface of the conveyor without the object to be conveyed, the cross-sectional area of the object to be conveyed is calculated by a computer device separately provided, and the multiplication and integration processing of this and the conveyor speed of the conveyor are performed. In this way, the capacity of the conveyed product 11 is obtained.

Further, the two light receivers 14a and 14b both capture the sectional curve image by the same reflected light, and normally, the image data of one of the light receivers 14a is used, but as shown in FIG. When the image data from one of the light receivers in use is blocked by the convex portion 15 and even part of the light cannot be received, the image data of the other light receiver 14b is used to perform the arithmetic processing.

In addition to the above, the image data of both the light receivers 14a and 14b may be any image data of the other light receiver when the image data from the one light receiver is incomplete. Various concrete methods can be adopted.

[0014]

As described above, the capacity measuring device for a conveyor belt conveyer according to the present invention receives the reflected light of the slit light irradiated at one location from the front and rear sides in the conveyor convey direction by the two light receivers. Since the cross-sectional image data is obtained by using, for example, even when a block or stone of cohesive soil is projected on the surface of the transported object and becomes a shadow of the reflected light to one light receiver, , The other photodetector can receive reflected light without shadowing, and by using both photoreceivers as backups, cross-sectional image data can be obtained without traces and high-accuracy capacitance measurement becomes possible. It is a thing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the same.

FIG. 3 is a cross-sectional view showing a reflected light blocking state of the above.

FIG. 4 is a cross-sectional view showing an example of a conventional device.

FIG. 5 is a cross-sectional view showing a case where reflected light of the same is blocked.

[Explanation of symbols]

 10 Belt Conveyor 11 Transported Object 12 Slit Light Irradiator 13 Slit Light 14a, 14b Light Receiver 15 Convex Part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Hara 1-11-25 Higashiooi, Shinagawa-ku, Tokyo Inside the Technical Research Institute, Goyo Construction Co., Ltd. (72) Masahiro Kozaki 1-11, Higashioi, Shinagawa-ku, Tokyo No. 25 Goyo Construction Co., Ltd. Technical Research Institute (72) Inventor Masao Kanazawa 1-29-13 Kameido, Koto-ku, Tokyo Nisshin Electronics Co., Ltd. (72) Inventor Yasunori Maekawa 1-Kameido, Koto-ku, Tokyo 29-13 Nissin Electronics Co., Ltd.

Claims (1)

[Claims] 1. A slit light irradiator irradiates a conveyed object conveyed on a belt conveyor with slit light directed in the width direction of the belt conveyor, and a light receiver receives reflected light from the surface of the conveyed object. In the capacity measuring device for a belt conveyor conveyed object, which continuously detects the sectional shape of the conveyed object by a light cutting method and continuously measures the conveyed object capacity by the sectional shape and the conveyor speed, the slit light irradiation position is set to the center. And separate light receivers are installed diagonally above and in front of and behind the conveyor direction, and the capacity of the belt conveyer is measured by continuously detecting the cross-sectional shape of the conveyer by both of these light receivers. apparatus.