JP2008169274A - Method for detecting tip position of coke pushing ram and tip position detecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting the tip position of a coke pushing ram for the continuous measurement of the oven wall shape of a plurality of ovens in high efficiency without obstructing the operation of a coke oven and to provide an apparatus for detecting the tip position of a coke pushing ram by using the detection method. <P>SOLUTION: The invention relates to a method for detecting the tip position of a pushing ram attached to a coke pusher of a coke oven, comprising a step to irradiate a cooled structure attached to the tip of the pushing ram with light, a step to pick up the image of the irradiated structure, and a step to detect the tip position of the pushing ram based on the image pick-up signal of the structure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coke extruder for a coke oven, in which a sensor unit of a distance measuring means is mounted at the end of the extrusion ram, and the distance between the end of the extrusion ram and the furnace wall is set as the extrusion ram is inserted into the coke oven carbonization chamber. In the coke oven carbonization chamber furnace wall shape measurement, which sequentially measures the furnace wall profile by measuring, the distance measuring means installed at the tip of the extrusion ram generated along with the insertion of the extrusion ram. The present invention relates to a tip position detecting method and a tip position detecting device for referring to a position with respect to.

  The shape of the wall of the coking chamber of the coke oven gradually changes as it is shaved or collapsed. When the shape of the furnace wall changes greatly, it is necessary to spray a repair material on the furnace wall as a repair, or in some cases, replace the furnace material on the furnace wall. Therefore, it is necessary to constantly monitor the shape of the furnace wall. As a method therefor, a method is used in which the distance to the furnace wall is sequentially measured with an extrusion ram tip end distance meter provided in the extruder, and the profile of the furnace wall is sequentially measured from this measurement data. In the coke oven carbonization chamber wall shape measurement, the extrusion ram tip changes in the carbonization chamber kiln width direction as the extrusion ram is inserted, and the position of the distance measuring means sensor unit also changes in the coking chamber kiln width direction. Therefore, an error occurs if the measured value measured by the distance measuring means is directly used as the profile of the furnace wall.

  As a method of correcting this error, a sensor position reference point provided at a position near the sensor installed at the ram tip is photographed with a camera provided outside the furnace together with a furnace reference point provided near the coking chamber kiln. In addition, a method has been developed in which a change in the sensor position is calculated and corrected based on the relative positional relationship between the photographed sensor position reference point and the furnace body reference point.

  With respect to the sensor position reference point used for such a purpose, for example, a method of installing a laser diode (hereinafter referred to as LD) to emit light (see Patent Document 1) or a method of emitting light using an optical fiber has been proposed ( Patent Document 2). Further, there has been proposed a method in which a laser light receiving unit and a laser light receiving unit observation unit are installed in an extrusion ram and a laser light emitter is installed in an extruder main body (see Patent Document 3).

JP 2001-215271 A JP 2003-172606 A JP 2004-245688 A

  However, in the method of Patent Document 1, when measuring the furnace wall shape of different kilns continuously, the LD is destroyed due to the influence of radiant heat. There is a problem in that coke oven operation is hindered if measurement is performed while replacing a damaged LD. Also in the method of Patent Document 2, stress is applied to the portion where the optical fiber is fixed due to expansion / contraction of the optical fiber due to ambient temperature or vibration during extrusion. If used continuously, the repeated stress will be applied, and the deterioration over time will be severe. If the repair period is shorter than the regular repair interval of the furnace, the operation efficiency will eventually be reduced. In addition, since the optical fiber is expensive in the process of manufacturing the optical fiber as a set with the guide tube, there is a problem that it is expensive to replace frequently. Moreover, in the method of patent document, the observation means is installed in the extrusion ram, and the observation means must be high performance in terms of heat resistance and durability, and is expensive. If the configuration is inexpensive, the repair period is shortened, and there is a problem that the operation efficiency is lowered as in the case of Patent Document 2.

  The present invention has been made in view of the above circumstances, and its purpose is to enable coke oven wall shape measurement of a plurality of kilns efficiently and continuously without interfering with the operation of the coke oven. An object of the present invention is to provide a method for detecting the tip position of an extrusion ram and a tip position detection device for a coke extrusion ram to which the method is applied.

  The tip position detection method of a coke extrusion ram according to the present invention is a method of detecting the tip position of an extrusion ram provided in a coke extruder of a coke oven, and is cooled attached to the tip portion of the extrusion ram. A step of irradiating the structure with light; a step of imaging the irradiated structure; and a step of detecting a position of a tip of the extrusion ram based on an imaging signal of the structure. In the present invention, since the above structure is illuminated by radiant heat in the coke oven, it is likely to be heated and emit radiant light unless it is cooled. Then, when the structure is in the furnace, the difference in the amount of radiation from the surroundings is small, and even if the structure is imaged by irradiating with a light source, no contrast is obtained and the structure is difficult to recognize. Therefore, if the structure is cooled, radiation of radiation due to heating can be suppressed, and contrast with the surroundings can be obtained. For this reason, it can utilize as a reference point by recognizing the imaged structure. It is important to select a structure having mechanical strength and heat resistance. With respect to the structure installed near the tip of the coke extrusion ram, it is possible to use an existing structure, and the structure may be greatly simplified. For this reason, it is possible to measure the furnace wall shapes of a plurality of kilns efficiently and continuously without interfering with the operation of the coke oven.

  The tip position detection method for a coke extrusion ram according to the present invention irradiates the structure with linear light in the step of irradiating the structure with light. The shape of the irradiated light differs depending on the shape of the structure. For example, in the case of a pipe-like structure, the irradiated light shape looks like a semi-ellipse. Recognizing how the semi-ellipse moves, the movement of the ram tip can be recognized. Further, the irradiation width by the light source needs to be sufficiently wider than the structure.

  In the method for detecting the tip position of the coke extrusion ram according to the present invention, in the step of irradiating the structure with light, the structure including an air pipe is irradiated with light. Air piping may use existing equipment as it is, or may be newly installed. However, if the above-mentioned structure and air piping for cooling the structure are installed, the air piping is irradiated as it is. It is more efficient in terms of installation space.

  Further, in the method for detecting the tip position of the coke extrusion ram according to the present invention, light having a narrow wavelength band in a wavelength band different from the infrared band is used as the light, and in the imaging step, a filter having a narrow wavelength band is used. Take an image. According to the present invention, the influence of the amount of radiation in the coke oven is small, and the shape of the structure can be recognized with good contrast.

  The coke extrusion ram tip position detecting device according to the present invention is a device for detecting the tip position of the extrusion ram provided in the coke extruder of the coke oven, and is a cooled attached to the tip portion of the extrusion ram. A light source that irradiates light to the structure that is irradiated, an imaging means that images the irradiated structure, and an arithmetic means that detects the tip position of the extrusion ram based on an imaging signal of the imaging means is there.

  In order to grasp the coke oven carbonization chamber situation, for example, a sensor part of a non-contact distance meter means (for example, an antenna for transmitting and receiving electromagnetic waves) is inserted into the furnace and scanned, and the carbonization chamber wall surface is measured from the position of the sensor part. In this case, the sensor unit is often displaced in the direction perpendicular to the operation reference line (distance measurement direction). Therefore, in the present embodiment, the position of the sensor unit inserted in the carbonization chamber is sequentially photographed by the image photographing means and the direction / position measuring means installed at a predetermined position with respect to the coke oven body, and the image The amount of displacement in the distance measurement direction from the scanning reference line of each measurement point of the sensor unit is corrected after correcting the variation in the direction and position of the image capturing means by the relative direction and position of the image capturing means with respect to the coke oven body. Obtained sequentially, the measured value of the distance measuring means is corrected by each displacement amount of the sensor unit. Since the sensor unit is installed at the ram tip, if the ram tip position is measured using this embodiment, the position of the sensor unit is also obtained.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a mechanism around a coke extrusion ram which is an example of an embodiment of the present invention. The air piping at a position close to the tip on the ram beam 1 of the coke extruder is set as the irradiation target structure 2. In the case of this example, the structure 2 is a pipe of air blown to burn the in-furnace carbon, and can be used without adding new equipment because of the existing structure. When used in the present embodiment, it is necessary to keep air constantly flowing even if there is no need for carbon combustion, but the flow rate may be small. The structure 2 is irradiated with light having a linear spot shape.

  FIG. 2 is an explanatory diagram of the laser sheet light of the light source. For example, a laser is used as the light source, and irradiation is performed as so-called slit light having a linear shape as shown in FIG. In the example of FIG. 2, the position of 10 m from the laser 202 is the furnace entrance, and the position of 30 m is the furnace exit, so the design is as shown. If the laser sheet width is made to be 150 mm wide at the laser irradiation port and 200 mm wide at 10 m ahead, it becomes 300 mm wide at 30 m ahead, which is sufficient for irradiating the structure (in this example, air piping) 2. Although it depends on the amount of laser light, it is possible to recognize the shape of the structure even if it is irradiated in the form of a circle of φ200 mm or φ300 mm instead of a sheet, but the laser power is required as the irradiation area expands. Since the apparatus is enlarged, a sheet shape is suitable.

  FIG. 3 is an explanatory diagram of an imaging method. The structure 2 is irradiated with light having a wavelength different from the wavelength of radiant heat in the carbonization chamber from the external light source 202, and the contrast 204 is obtained by selectively passing the wavelength of the external light source 202 as the filter 204 of the imaging means 203. I'm wearing it. For example, a personal computer 205 that functions as a calculation unit of the present invention is connected to the output side of the imaging unit 203.

FIG. 4 shows an example of imaging by irradiating the structure 2 with a laser sheet from the external light source 202. FIG. 4A shows an example of an image captured when the external light source 202 is installed below the imaging unit 203. FIG. 4B shows a case where the position is reversed. In this imaging example, the laser sheet irradiated and reflected on the structure 2 is imaged in a semi-elliptical shape. In FIG. 4, the laser light is displayed in black for easy understanding, but in actuality, the image is picked up with brighter brightness than the background. When the personal computer 205 recognizes the ellipse of the imaging signal, the position of the structure 2 can be obtained. As a recognition method, for example,
In (a), the image is scanned in the horizontal direction, and the pixel that is the lowest point among the pixels having a predetermined luminance or higher may be found. However, since there is a possibility that granular noise or the like is captured, it is preferable to use a spatial low-pass filter such as taking an average of several points for the captured image data.
In the case of (b), the highest point is found.
Finding where these points are in the horizontal direction on the image, the ram tip position relative to the imaging means 203 can be calculated. If the imaging means 203 is fixedly installed at a predetermined position with respect to the furnace body, the ram tip position with respect to the furnace body can be calculated from these points. The calculation method will be described with reference to FIG.

FIGS. 5A and 5B are explanatory views showing a method for obtaining the distance from the center of the furnace body of the target (the lowermost point or the uppermost point), and FIG. Explanatory drawing of the state seen, (B) is a captured image. The personal computer 205 performs the following processing.
(A) The width W of the captured image is obtained. W = φ (Yt−Yc)
However, the deviation θ between the center of the furnace body in FIG. 5A and the center of the camera as the imaging means is a small angle, the center point of the camera angle of view is (Xc, Yc), the angle of view is φ, Let the position be (Xt, Yt).
(B) Yt is known to capture the ram travel distance from the driving system, and Yc is also known to be fixed. Therefore, the number of single-length dots is obtained from the number of dots of the image width and the horizontal width W of the image.
(C) Xp, which is the position of the target on the image, is obtained by the number of dots, and is converted into an actual distance.
(D) If the actual distance XRc between the center of the furnace body on the image and the center of the image is obtained, the distance from the target to the center of the furnace body is obtained. This XRc is
(Yt−Yc) θ = XRc−Xc
Ｘ XRc = Xc + (Yt−Yc) θ
Since Xc is known to be fixed, and XRc is obtained, the distance from the center of the furnace body of the target is obtained as Xp−XRc.

  It should be noted that the external light source 202 and the imaging means 203 of the present embodiment are preferably installed in an extruder main body that is a separate structure from the coke extruder ram in consideration of factors such as vibration. The structure 2 is a circular air pipe in this example, but the shape of the air pipe may be square. If a structure made of a material that does not red heat in the furnace (the amount of radiant heat due to heating is small) is used, cooling is not necessary.

  As described above, according to the present embodiment, it is possible to measure the furnace wall shapes of a plurality of kilns efficiently and continuously without interfering with the operation of the coke oven.

It is a schematic diagram of the mechanism of the peripheral part of the coke extrusion ram which is an example of an embodiment of the invention. It is explanatory drawing of the laser sheet light shape of a light source. It is explanatory drawing of the imaging method. It is explanatory drawing which showed the example image of the imaged air piping. It is explanatory drawing which showed the method at the time of calculating | requiring the distance from the furnace body center of a target.

Explanation of symbols

  1 coke extrusion ram beam, 2 structure, 3 ram head, 202 external light source, 203 imaging means, 204 optical filter, 205 personal computer.

Claims (5)

A method for detecting the tip position of an extrusion ram provided in a coke extruder of a coke oven,
Irradiating light to a structure that is attached to the tip of the extrusion ram and being cooled;
Imaging the irradiated structure;
And a step of detecting a tip position of the extrusion ram based on an imaging signal of the structure.   The method for detecting a tip position of a coke extrusion ram according to claim 1, wherein in the step of irradiating the structure with light, the structure is irradiated with linear light.   The method for detecting the tip position of a coke extrusion ram according to claim 1 or 2, wherein, in the step of irradiating the structure with light, the structure made of an air pipe is irradiated with light.   4. The light according to claim 1, wherein a light having a narrow wavelength band in a wavelength band different from an infrared region is used as the light, and imaging is performed through a filter having a narrow wavelength band in the imaging step. 4. A method for detecting a tip position of a coke extrusion ram according to 1. A device for detecting the tip position of an extrusion ram provided in a coke extruder of a coke oven,
A light source attached to the tip of the extrusion ram and irradiating light to the structure being cooled;
Imaging means for imaging the irradiated structure;
An apparatus for detecting the tip position of a coke extrusion ram, comprising: an arithmetic means for detecting a tip position of the extrusion ram based on an imaging signal of the imaging means.

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