KR20000043439A - System for continuously obtaining surface image of roll during roll in cramped space - Google Patents

Abstract

PURPOSE: A system is provide to obtain continuous image corresponding to one time rolling of a roll by synchronizing by calculating the amount of image obtaining range of one time of a camera with a generated code. CONSTITUTION: Continuous image of one time rolling of a roll is displayed by a worker by detecting a portion out of a standard state of a roll or decolorization or alien substances by using an image processing method or stored in a data storage unit(12). The rolling degree of the roll is sensed and transmitted to a personal computer(9) from an incremental encoder(13) generating the rolling degree as pulses as an electrical signal. The personal computer transmits a driving signal to an optical resource(7) and a CCD(charge coupled device) semiconductor device(5) via a synchronized pulse generating circuit(8) by calculating roll area corresponding to one time image obtaining and obtains image of a roll continuously. To keep uniform distance between the roll and a sensor head(1), the output signal of the sensor is processed in the personal computer and transmitted as a driving signal for a motor(10).

Description

Continuous Image Acquisition System for Rolling Rolls in Narrow Spaces

According to the present invention, the roll surface being rolled at a narrow place to observe the aging degree of the roll according to the surface state of the expensive rolled roll and the state of the roll surface according to the characteristics of the rolled material as a continuous image during rolling A system for continuous acquisition of images.

In general, in the steel industry and other fields using a rolling roll, the cooling water sprayed for cooling the roll during rolling is sprayed on the front of the roll, and this cooling water is mixed with the lubricating oil required for driving the machine to have an opaque color. The cooling water pressure of is 20-25kg / ㎠.

In addition, the surface of the roll during rolling has a high heat of 60-80 ° C., and vibration of the roll in the rolled state occurs considerably.

In this situation, it is necessary to continuously monitor the surface state of the roll in order to observe the change of the surface state according to the rolling amount of the roll, or to accurately know the knitting and roll change timing of the roll rolling unit.

As a way of observing the surface of the roll being rolled under the harsh environment that the optical system is hard to access, a transparent material such as water pipe and glass is used as a waterproof wall using a CCD camera, and water supplied at a constant pressure is used as the surface of the roll. The water is discharged to form a water pipe between the surface of the roll and the camera, through which light is used as an auxiliary light, thereby acquiring the state of the surface as an image.

However, in an environment such as a stand in which a hot rolled roll is installed, a nozzle for spraying cooling water is installed in the width direction of the roll, and a backup roll is installed on the top of a roll to be mechanically complicated.

A method and apparatus for observing the surface of a roll under such an environment is Korean Patent Application No. 97-70099, but the method and apparatus applied to the roll at any time using instantaneous light with respect to the rotation of the roll. It is possible to observe the surface of the operator or the roll to observe the change of state by intermittently acquiring the surface image for the operator. The method was impossible.

The present invention has been made to solve the above problems, the operation of the light source and the camera by using a signal generator (Incremental Encoder) to detect the amount of rotation of the optical fiber and the roll that can transmit light to output a signal corresponding to the rotation The purpose is to obtain a continuous image corresponding to one roll rotation by calculating the timing according to the roll rotation and calculating and synchronizing the calculation amount of the camera's one-time image acquisition range with the generated sign. .

1 is a block diagram showing a continuous acquisition system of the rolling roll surface image of the present invention

2 is a header structure for roll surface image acquisition

3 is a cross-sectional view of FIG. 2 in FIG.

4 is a configuration view from above of FIG.

5 is a timing diagram of the rotation amount and image acquisition of the roll

1 sensor header 2 sensor

3: optical fiber for illumination 4: optical fiber for camera

5: CCD semiconductor element 6: camera

7 light source 8 synchronization signal generating circuit

9: personal computer 10: motor

11 monitor 12 data storage device

13: code generator 14: water pipe

15: bundle of optical fiber 16: waterproof tube

1 is a block diagram showing a system for continuously observing the surface state of a rolling roll during rolling in a narrow space.

The present invention observes the change of the state of the roll surface as a continuous image during rolling to monitor or inspect the roughness of the roll surface, the change of color, the foreign matters, and the like. A sensor head portion 1 including a sensor 2 for measuring a distance, an optical fiber 3 for emitting an auxiliary light, and an optical fiber for camera 4 having a condensing function; A CCD semiconductor element 5, a camera 6 for acquiring an image, a light source 7, and a synchronous pulse generating circuit 8 for simultaneous operation of the light source 7 and the camera 6; A personal computer 9 for controlling them; A motor 10 for maintaining a constant distance between the sensor head 1 and the surface of the roll R according to the instruction of the personal computer 9; A monitor 11 for displaying an image acquired from the camera 6; A data storage device 12 for storing the acquired image; It consists of a sign generator 13 that can generate the rotational amount of the roll as an electrical signal so that the computer can calculate the time of image acquisition of the lighting and camera.

The configuration of the sensor head portion 1 in the configuration of continuously acquiring the roll surface image being rolled at the narrow place comprises a sensor for measuring the distance between the small CCD camera and the roll R and the sensor header portion 1 ( 2), after forming the water pipe 14 to acquire the roll surface image with the optical fiber bundle 15 including the lens of the light condensing function to continuously acquire the image of one roll of the rolling roll surface The optical fiber bundle 15 was used to irradiate illumination or to acquire images continuously.

Referring to the present invention in more detail as follows.

In the present invention, the roll R rotates at a speed of 4 meters or more per second by rolling or a similar rotary roll, and at this time, it is possible to detect a change in the roughness or a change in the band of the image area of the roll surface to be acquired. Shoot very close to a very small area.

In order to obtain a stable still image signal through the area-type CCD semiconductor element 5 composed of pixels of 484 × 680 and the like with such a small area, an instantaneous light emitting source having an emission time of 10 mW or less should be used. The signal generated by the code generator 13, which makes the whole quantity an electrical signal, is compared with the rotation amount and the acquisition area of the roll image in the personal computer 9 to calculate the time when the acquired image is out of the camera range in the roll rotation direction. Thus, a signal corresponding to an image acquisition command is generated in the synchronous pulse generating circuit 8, and the synchronous pulse generating circuit 8 is linked with the camera image acquisition moment.

Light emitted through the optical fiber 3 for illumination reaches the surface of the roll through a water pipe formed by continuously supplied water, and the light reflected from the surface of the roll passes through the optical fiber 4 to the CCD semiconductor element 5. Delivered.

The light signal in the CCD semiconductor element 5 is converted into an electrical signal, and is composed of an image frame forming board, that is, a camera 6 for acquiring an image.

The data created in this way is transferred to the personal computer 9 to connect the data acquired continuously to form an image corresponding to one rotation of the roll into a continuous image.

The roll 1 continuous image configured in this way is displayed to the worker, or the image processing method is used to detect a part that is out of the standard roll state, or to detect the change in color, foreign matter, etc., and display it to the worker. The data is stored in the storage device 12.

The rotation amount of the roll is sensed and the amount of the rotation is generated by a pulse generator 13, which transmits the rotation amount as an electrical signal to the personal computer 9, and the personal computer 9 receives the roll area of the image acquisition once. The driving signal is generated and transmitted to the light source 7 and the CCD semiconductor element 5 through the synchronous pulse generation circuit 8 to continuously acquire the roll image.

The acquired image is stored in the memory in the frame grabber, and the image data can be processed sequentially or a series of images can be shown to the lion. In this manner, an image corresponding to (width 10mm) x (1 rotation of the roll) can be acquired.

The roll in rolling has severe vibration, and the cooling water sprayed for cooling the roll is sprayed on the front of the roll, and the cooling water pressure at this time is 25Kg / cm 2.

In order to maintain a constant distance between the roll and the sensor head 1, the output signal of the sensor 2 is processed by the personal computer 9 and sent as a drive signal of the motor 10.

2 is a structure of the sensor header part 1 which is applicable to the high pressure cooling water high pressure injection and the vibration of a roll, and can acquire the surface image of the roll in high speed rotation.

In this case, when the purified water is supplied to the waterproof pipe 14 formed at the rear end of the sensor head 1 in order to spray the purified water on the surface of the rotating roll R while vibrating, the waterproof pipe 14 and the roll A water column or a water pipe is formed between the surfaces of (R).

In the optical fiber bundle 15 including the optical fiber 3 for illumination and the optical fiber for camera 4 through the water pipe formed as described above, light reflected by instantaneous emission is transmitted to the CCD semiconductor element 5 at the rear end.

FIG. 3 is a cross-sectional view of the visible wire of FIG. 2, which shows an optical fiber bundle capable of transmitting light, and includes a waterproof tube 16, an optical fiber 4 for transmitting a roll surface reflection signal to the camera 6, and an illumination light. It is composed of an optical fiber bundle 15, a water pipe 14 for transmitting.

4 is a configuration view of the sensor head from above, the sensor 2 for measuring the distance between the roll R and the sensor head 1, and the sign generator 6 which makes the rotation amount of the roll an electric pulse signal. The sensor 2 measures distances from both left and right sides with respect to the sensor head 1 to calculate a distance value as an average value.

The distance signal produced by the sensor 1 is transferred to the personal computer 9 to generate a drive signal to the motor 10 to maintain a constant distance designated by the worker. The sign generator 13 for detecting the amount of rotation of the roll is installed on the axis of the roll and generates thousands or tens of thousands of pulse signals in one revolution of the roll in proportion to the amount of displacement. It is used to determine when to operate the lights and cameras by comparison with the acquisition range.

The present invention as described above is a device that can generate the amount of light as an electrical signal by using the optical fiber to the light of the light source by irradiating the surface of the roll to the surface of the roll through the optical fiber to the surface of the roll being rolled Through this method, the surface image can be continuously acquired in a narrow space where the light source cannot be brought close to the surface of the roll, and inspection or monitoring such as color change, roughness change, or noise of foreign matter can occur on the surface. By moving the roll surface image acquisition range in the longitudinal direction of the roll, there is an effect of monitoring the presence or absence of surface abnormality of the entire roll.

Claims (3)

Measures the distance between the roll (R) and the sensor header (1) to monitor or inspect the change of the roll surface roughness, color change, and foreign matters by observing the state change of the roll surface as a continuous image during rolling. A sensor head (1) comprising a sensor (2), an illumination optical fiber (3) for emitting auxiliary light, and a camera optical fiber (4) for condensing; A CCD semiconductor element 5, a camera 6 for acquiring an image, a light source 7, and a synchronous pulse generating circuit 8 for simultaneous operation of the light source 7 and the camera 6; A personal computer 9 for controlling them; A motor 10 for maintaining a constant distance between the sensor head 1 and the surface of the roll R according to the instruction of the personal computer 9; A monitor 11 for displaying an image acquired from the camera 6; A data storage device 12 for storing the acquired image; It consists of a sign generator 13 that generates the rotational amount of the roll as an electrical signal so that the computer can calculate the time of image acquisition of the lighting and camera, so that the state of the roll surface can be continuously observed during rolling. Surface image continuous acquisition system of rolling rolls in a narrow space. Measuring the distance between the compact CCD camera and the roll (R) and the sensor header (1) in the configuration of the sensor head (1) in the configuration of continuously acquiring a roll surface image of rolling in a narrow place. Surface image continuous acquisition system of the rolling roll in a narrow space, characterized in that consisting of a sensor (2) for. The method according to claim 1, wherein after forming the water pipe (14) for acquiring the roll surface image with the optical fiber bundle (15) including the lens of the condensing function for continuously acquiring the image of one roll of the rolling roll surface, A system for continuously acquiring surface images of a roll being rolled in a narrow space, characterized by irradiating illumination or acquiring images continuously using the optical fiber bundle (15).