JPS5854650Y2 - object detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an object detection device, and more particularly to an object detection device for detecting the moving position of a moving object such as a rolled material during rolling.

Generally, in thick plate rolling, it is necessary to detect the positions of both edges of the material at the front or rear roller table of the rolling mill in order to know the shape, width, or bend of the end face of the material.

Conventionally, optical detection has been adopted for this type of detection, and a method has been adopted in which the upper surface of the rolled material is detected by an optical detector provided facing downward at the upper part of the roller table.

However, there is a large amount of steam above the roller table due to the water used in the rolling mill, and this steam cannot be completely removed by purging with a fan; The drawback was that the light was scattered or attenuated by the steam, making normal detection impossible.

For this reason, attempts have been made to place an optical detector below the roller table for detection in order to avoid the influence of steam.

When an optical detector is placed below the roller table, it can be directed either directly or diagonally upwards to directly capture the image of the rolled material, or it can be directed horizontally and captured through a reflector. There are two ways to indirectly capture images of rolled materials.

Although these methods can solve the problem of steam, they cannot avoid the effects of falling water, mill scale, etc., making detection difficult.

In other words, mill scale, etc. may fall onto the light receiving section of an optical detector facing upward, mill scale, etc. may accumulate on a dust-proof shielding plate provided in front of the light receiving section, or mill scale, etc. may accumulate on a reflecting mirror. There was a drawback that the passage of light was obstructed by the accumulation.

An object of the present invention is to provide an object detection device that can detect a moving object with high precision without being affected by water droplets, dust, etc. falling below it.

The present invention uses a cylindrical reflector located below the movement path of the object to be detected, which is rotated and whose surface has a mirror surface formed by a water film, to reflect the light from the object to be detected. It is characterized by detecting with an optical detector.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1 and 2 show a preferred embodiment of the object detection device of the present invention.

Figure 1 is a plan view of the roller table, Figure 2 is the I of Figure 1.
FIG. 3 is a cross-sectional view taken along line I-II.

In the figure, a roller table 2 is composed of a plurality of rollers 4 arranged in parallel, and an object 6 to be detected is transported by the rollers 4.

The object to be detected 6 is a moving object with a certain shape, such as a rolled material.

A reflector 8 whose axis is parallel to the axis of the roller 4 is rotatably provided below the roller 4 .

The reflector 8 is provided to reflect the light 6A from the detected object 6 in a predetermined direction, has a cylindrical shape, and is rotated by a drive motor 10.

A nozzle 12 for spraying water onto the surface of the reflector 8 is arranged diagonally below the reflector 8, as shown in FIG. 2, and this nozzle 12 is supplied with water 13 from a water source (not shown). There is.

Water 13 sprayed from the nozzle 12 is on the surface of the reflector 8.
A water film is formed, creating a mirror surface.

The purpose of forming a mirror surface with a water film in this way is to form a constant reflective surface regardless of the color, roughness, etc. of the surface of the reflector 8, and to form a reflective surface due to the adhesion of steam, mill scale, etc. The goal is to prevent the negative effects of

As shown in FIG. 2, the light 6A from the object 6 to be detected is always reflected by the reflector 8 in the horizontal direction, that is, parallel to the object 6 to be detected.

A plurality of light receiving tubes 14 are arranged at a portion that can receive the reflected light 6B, so that only the parallel light of the reflected light 6B from the reflector 8 is received.

For this reason, the light-receiving optical path of the light-receiving tube 14 is made perpendicular to the axis of the reflector 8, and special consideration is given to the inner surface serving as the light-receiving optical path to prevent diffuse reflection.

Furthermore, the reason why the plurality of light receiving tubes 14 are arranged in parallel is to receive parallel light and detect the moving position of the object 6 from the light, thereby determining the end face shape, width, etc. .

A light guide 16 is connected to each of these light receiving tubes 14, so that the received light is transmitted thereto.

The light guide 16 is made of, for example, glass fiber.

The light guide 16 is collectively connected to an optical detector, for example, an image sensor 18, so that the received light is input to the image sensor 18 via the light guide 16.

The image sensor 18 is composed of a photoelectric converter.

A controller 20 is connected to the image sensor 18 .

This controller 20 is provided to output a detection signal of the image sensor 18 and to drive the image sensor 18.

The moving position of the object to be detected 6 can be known from the output of the controller 20, and thereby the end face shape, width, etc. of the object to be detected 6 can be measured.

With the above configuration, when the detected object 6 is in a high-temperature red-hot state, when the detected object 6 comes above the reflector 8, a part of the light 6A emitted by the detected object 6 is reflected. The light is reflected by the water film formed on the surface of the vessel 8 and enters the light receiving tube 14 through a path as shown by the broken line in FIG.

Since the light receiving tube 14 receives only parallel light beams, the detected object e16
The light 6B enters only those located inside the width of.

The light entering the light receiving tube 14 is transmitted to the image sensor 18 via the light guide 16.

The image sensor 18 detects which light receiving tube 14 the light enters, and the result is output from the controller 20 as a detection signal of the shape and width of the end.

For example, in FIG. 1, if the end face shape of the front end of the object to be detected 6 is like A or B, that shape will be outputted by light reception by the light receiving tube 14.

Therefore, it is possible to measure the end face shape or width of the object 6 to be detected.

In addition, when the detected object 6 does not emit light, that is, when it is not in a high-temperature red-hot state as described above, a light projector (not shown) is provided above the detected object 6, and the light emitted from it is transmitted to the detected object 6. It is possible to know the end face shape and width from the range blocked by.

As described above, since the surface of the object to be detected 6 has a mirror surface formed of a water film and is rotatably driven, it is not affected by the color or roughness of the surface. Moreover, since it rotates at high speed, foreign matter such as mill scale does not adhere to the surface, and light can always be reflected stably.

In this embodiment, the light receiving tube 14 and the light guide 16 are used to transmit light, but if the object 6 to be detected does not move up and down, the light from the reflector 8 is guided directly to the image sensor 18 through the lens. A similar effect can be obtained by detecting

Although a water film is formed on the reflective surface of the reflector 8 by the light from the nozzle 12, other methods include forming a water film using a brush or placing the lower half of the reflector 8 in an aquarium. A similar effect can be obtained by a method of immersion to form a mirror surface with a water film.

Furthermore, it is preferable to blow purge air into the light receiving tube 14 and blowing it out from the light inlet in order to keep the inside of the light receiving tube 14 clean at all times.

As explained above, according to the present invention, an object to be detected can be detected with high precision without being affected by steam, mill scale, etc.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a roller table implementing the object detection device of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■I--■I in FIG. 6...Object to be detected, 8...Reflector, 18
・・・・・・Image sensor.

Claims (1)

[Scope of utility model registration request] It is located below the moving path of the object to be detected, is installed horizontally at right angles to the direction of movement of the object, and is rotated and forms a water film on the surface to prevent light from the object. The light reflected from the reflector is received through a cylindrical reflector that reflects the light, and a light receiving section that is installed substantially horizontally with its axis parallel to the movement path and directed toward the outer peripheral surface of the reflector. and an optical detector for detecting an object to be detected.