JPS61194304A - Measuring apparatus of residual tapping trough thickness of blast furnace - Google Patents

Abstract

PURPOSE:To eliminate errors by temperature, by measuring residual thickness of refractory material inside a tapping trough by deviation of a profile of inside surface of the tapping trough measured by an optical cutting method and the reference optical image previously obtained. CONSTITUTION:Laser beams are irradiated from projectors 31a, 32a of each laser profile meter 31, 32 into the inside of a topping trough 10 through the specified angle and each laser beam is allowed to scan in the transversal direction of the trough 10. Each laser beam scans from the top of each side surface to the center of the bottom surface and thus, in a calculator 50, deviations of the previously set reference optical image and that caught by image pick-up apparatuses 31b, 32b are calculated consecutively. From these deviations the residual thickness of the refractory material 14 inside the trough 10 are measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a device for measuring the remaining thickness of refractories in a blast furnace tap trough.

[Prior art]

A blast furnace tap trough is a metal frame with a concave cross section and a refractory lined on the inner surface, and if the refractory is eroded by the flow of hot metal, it may cause a single-pig accident.

For this reason, we measured the remaining thickness of the refractory in the blast furnace tap trough.
It is important to understand the melted state of the tap runner in advance in order to prevent the occurrence of single-pig accidents.

[Problem that the invention seeks to solve]

Conventionally, the remaining thickness of refractories in blast furnace tap troughs has been measured manually using a metal ruler, etc., but the temperature inside the troughs reaches over 800°C, making it difficult to work, and the measurement accuracy is poor. However, there were also problems, and the refractories had to be dismantled and replaced when there was a considerable amount of remaining thickness, impairing economic efficiency.

Therefore, a method of installing a movable heat flow meter on the side wall of the tap trough and estimating the remaining thickness of the refractory material in the tap trough from the heat flux value measured by the heat flow meter (see Japanese Patent Laid-Open No. 159008/1983) has been proposed. However, according to this method, the remaining thickness of the refractory material could only be determined approximately, and there was a problem with detection accuracy.

Another method is to insert a distance meter that detects distance using ultrasonic waves, lasers, etc. into the tap culvert, and to sequentially determine the distance between the distance needle and the inner surface of the tap culvert to determine the unevenness of the inner surface of the tap culvert. However, since distance meters using ultrasonic waves cause errors due to vibrations of air in high-temperature areas, and laser distance meters are large (minimum 220φ x 260 mm).
M), it could not be used for a tap hole with a width direction dimension of about 1000 mm.

Measures for Solving Problems c] The present invention has been made in view of the above circumstances, and its purpose is to provide a blast furnace tapping gutter residual thickness measuring device that does not cause errors due to temperature and has high detection accuracy. .

The present invention is capable of moving in the longitudinal direction of a blast furnace tap runner and moving up and down within the tap runner, projects and forms a light image on the inner surface of the tap runner, and keeps the light image constant with respect to the projection direction. a profile meter that captures an image with a two-dimensional imaging device from a direction having an angle of
and means for calculating the residual thickness of the inner surface of the optical image forming portion in the tap trough based on the deviation between the optical image captured by the profile meter and a preset reference light image on the inner surface of the tap trough. It is characterized by

〔Example〕

The present invention will be described below based on drawings showing embodiments thereof. FIG. 1 is a schematic elevational view of the measuring device according to the present invention. In FIG. A heat-resistant paving brick 12 is laid on the bottom of a metal frame with a concave cross section formed in 11, a fire-resistant brick 13 is provided on each inner side of the metal frame, and a fire-resistant brick 13 is provided on each inner side of the metal frame, and a A refractory 14 of a certain thickness is pasted, and the refractory 14
Hot metal flows inside.

On the side of the tap hole 1G on the upper surface of the cast bed 11, there is a tap hole 1G.
Guide rails 21 and 21 are positioned along the taper 10, respectively, and each guide rail 21 has wheels 23 provided on each side of a running truck 22 which is installed above and below the tap duct 10.
．． 23 are engaged with each other. The rotation of the motor 24 is transmitted to each wheel 23, 23 via a reducer 28,
Driven by the motor 24, the traveling carriage 22 moves along the tap hole lO. A mounting rod 25 extending in the vertical direction is provided in the center of the traveling truck 22 so as to be movable up and down, and two sets of laser profile needles 31 are installed at the lower end of the mounting rod 25.
．． 32 is installed.

The traveling truck 22 is provided with a motor 26 for driving the mounting rod 25 up and down, and the rotation of the motor 26 is transmitted to the mounting rod 25 via a reducer 27, and the mounting rod 25 is raised and lowered by driving the motor 26. The laser profile needles 31, 32 attached to their lower ends are then raised and lowered within the tap trough 10. A pulse generator 41 is attached to one wheel 23, and a pulse signal is emitted every time the wheel 23 rotates a predetermined number of times.

Each laser profile needle 31, 32 attached to the lower end of the mounting rod 25 measures half the profile of each side of the inner surface of the tap trough 10 by a so-called optical cutting method using a laser beam.

FIG. 2 is a schematic block diagram of a laser profile needle 31,32. Each laser profile needle 31.32
Measure each half of the inner surface of the tap hole 10, respectively. In the figure, 31a and 32a are projectors, which are equipped with a laser beam generator and a plane mirror that scans in one direction by changing the projection direction of the laser beam emitted by the laser beam generator. A laser beam is projected more or less vertically toward the inner surface and the bottom surface connected to the inner surface, and the laser beam is sequentially scanned in the width direction of the tap hole 10. Through this scanning, a light spot is formed on the inner surface of the tap hole 10, and the moving period of the laser beam is set to 1/1 frame time of the imaging devices 31b and 32b.
It is set at a high speed of 30 seconds or less, and an elongated optical image is formed in the captured images of the imaging devices 31b and 32b.

Imaging devices 31b and 32 are located at positions separated by an appropriate length in the longitudinal direction of the tap trough 10 from the installation positions of the respective light emitting lights 1131a and 32a.
b are respectively disposed, and the optical image formed on the inner peripheral surface of the tap hole 10 is imaged from a direction having a constant angle with the laser beam projection angle of the projector 31a. The imaging device 31
As b and 32b, a small one such as a CCD camera (30 x 30 x 100 cranes) manufactured by Sony Corporation is used, for example.

The output of each imaging device 31b, 32b is given to a computing unit 50, and the output of the aforementioned pulse oscillator 41 mounted on one of the running wheels 23 is given to the computing unit 50. The output of the computing unit 50 is given to a monitor device 51 and a recording printer 52.

To explain the operation of the apparatus of the present invention having such a configuration, the motor 24 is rotationally driven to position the traveling cart 22 above the tap hole IO, and the mounting rod 25 is raised and lowered by the rotation of the motor 26 to measure each laser profile. A total of 31.32 is the predetermined height position in the tap hole lO. In this state, the projector 31a of each laser profile meter 31°32
, 32a project laser beams onto the inner surface of the tap duct lO at a predetermined angle, and scan each laser beam in the width direction of the tap duct lO. Each laser beam is
The laser beams are scanned from the top of each side surface to the center of the bottom surface, and therefore both laser beams are scanned over substantially the entire inner surface of the tap hole 1O.

Now, the arithmetic processing in the arithmetic unit 50 will be explained based on the image shown in FIG. 3. The optical image (2) captured by the imaging devices 31b and 32b is recognized in the arithmetic unit 50 as coordinate values in a two-dimensional coordinate system. That is, the computing unit 50 is the imaging device 31b.
, 32b on each scanning line O, that is, the position of the optical image (2) is calculated as the coordinate value of the two-dimensional plane set on the image.

On the other hand, in the computing unit 50, the two-dimensional coordinate values of the reference light image (2) formed on the inner surface by projecting the laser beam in a state where the refractory 14 on the inner surface of the tap hole lO is not melted or damaged at all. This is set in advance, and the deviation between this reference light image and the light image (2) captured by the imaging devices 31b and 32b is calculated successively. The calculation result is given to a monitor device 51 and a recording printer 52, and the remaining thickness of the inner surface of the tap hole 1O is monitored by the monitor device 51 and recorded by the recording printer 52.

When the remaining thickness of the refractory material 14 on the inner circumferential surface in the width direction at a predetermined longitudinal position of the tap trough lO is measured in this way, the motor 24 is driven to rotate, and the traveling cart 22 taps the tap a predetermined distance. is moved in the longitudinal direction of mlO, and at that position Ai
Similarly to the above, the profile is displayed on the monitor device 51 over substantially the entire widthwise inner peripheral surface of the tap trough 10, and the remaining thickness of the refractory 14 is recorded on the recording printer 52. From then on, the same operation is repeated one after another, and the tap hole l
The remaining thickness of the refractory material on the inner circumferential surface of the tap trough lO is measured over the entire longitudinal direction of the tap hole lO.

In addition, in the above-mentioned Example, the optical image formed on the inner surface of the tap hole was formed using a laser beam, but it is not limited to this, and may be formed using, for example, an elongated slit light.

〔effect〕

According to the present invention, the profile of the inner surface of the tap hole is measured by a so-called optical cutting method using a laser beam, and the residual thickness of the refractory inside the tap hole is determined based on the deviation between the profile and a reference light image determined in advance. Detection accuracy is significantly improved. In particular, it becomes possible to detect with high precision in a tap trough which is at a high temperature, has a small width dimension and a large longitudinal dimension, and also enables unmanned measurement.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a schematic cross-sectional view of the apparatus of the present invention, FIG. 2 is a schematic block diagram of a laser profile meter, and FIG. 3 is an image for explaining arithmetic processing.

Claims (1)

[Claims] 1. It is possible to move in the longitudinal direction of the blast furnace tap runner and move up and down within the tap runner, and forms a projected light image on the inner surface of the tap runner. A profile meter captures an image with a two-dimensional imaging device from a direction having 1. A blast furnace tapping trough residual thickness measuring device, comprising means for calculating the residual thickness of the inner surface of the optical image forming portion.