JPH03120453A - Steel pipe heater for detecting with infrared camera - Google Patents

Abstract

PURPOSE:To execute uniform and rapid heating and the elimination of influence of an atmosphere by pressing a rubber tube to the rear surface of a rubber sheetlike mat heater to cover the surface to be inspected and expanding the tube to bring the heater into tight contact with the surface to be inspected. CONSTITUTION:The freely expandable and shrinkable rubber tube 16 is pressed via a hose 15 to the rear surface of the rubber sheetlike mat heater 14 clad on the surface 13a to be inspected of the steel pipe 13 packed with concrete 12. A press plate 17 is pressed to the rear surface of the tube 16. The press plate 17 is provided with an overhanging margin 17a from the tube 16 and electromagnets 17b,... for attraction are integrally provided on this part. The magnet 17b is turned on to attract the tube 16 to the surface 13a to be inspected. The surface 13a to be inspected is rapidly and uniformly transferred with heat if the heater 14 is energized after the tube 16 is expanded and the heater 14 is first backed up. The tube can be easily removed if the magnet 17b is turned off after the heating. The photographing with an IR camera is thus executed with good timing.

Description

[Detailed description of the invention] r Industrial application field” The present invention relates to a steel pipe heating device for infrared camera detection.

``Conventional technology'' Checks the condition of the object to be inspected, such as the filling condition of concrete in concrete filling pipes, the accumulation of dust in the cross-sectional area of the closed cross-section, and the boundary condition between the liquid and gas layers of the refrigerant in the refrigerator piping. JP-A-64-54241 introduces a means for easily and accurately detecting the presence of a contact object that is present in contact with the inner surface from the outer surface of the object to be inspected.

This proposed method for detecting the presence of a contact object on the inner surface of an object to be inspected is as follows:
The object to be inspected is rapidly heated from the outside. Immediately after the rapid heating, the outer surface of the object to be inspected is photographed using an infrared camera. Thus, the presence of contact objects that are present in contact with the inner surface of the object to be inspected can be detected using infrared rays. The feature is that it is detected as an image.

This proposed detection method will be described in detail below.

The main technical means of this proposal are as follows.

(1) Remotely and non-contactly photographing the outer surface of the object to be inspected, such as the piping to be inspected, using an infrared camera.

(2) Rapidly heating the photographed portion of the outer surface of the object to be inspected.

(3) Photographing with an infrared camera must be done at the right time immediately after rapid heating.

FIG. 4 is an explanatory diagram showing an embodiment of this detection method.

In Fig. 4, l is a concrete-filled pipe column whose pipe is filled with concrete 2, and first, the RAD 4 is directed toward the infrared camera in the infrared imaging bag [3] from one direction on the outer surface of the filled pipe column 1, which is the pipe to be inspected. Next, the camera head 4
The imaging range of the outside surface of the filled pipe column l and its surrounding area, which is captured on the screen of the monitor television 6 installed in the main body of the imaging device 3 through the lens 5 of the camera, is rapidly heated with the heater 7. The camera head 4 photographs the photographed range.

Now, as shown in FIG. 5, it is assumed that the filling of the concrete 2 is incomplete and a cavity (air layer) 8 is formed near the inner surface of the filled pipe column 1 to which the concrete 2 is not in contact.

Assume that the internal temperature of the concrete 2 is [1], and that the filled pipe column l is placed in an atmosphere at a higher temperature t0. Then, since the heat transfer between the concrete 2 and the cavity 8 is different, and the heat transfer is smaller in the cavity 8, as shown in FIG. As shown in FIG. 6(B), the tube wall portion 1b with the cavity 8 near the inner surface is more
The amount of heat removed from the inner surface of the tube by the outer surface of the tube is reduced. Therefore, at a certain time immediately after the filled pipe column 1 is left standing in an atmosphere at a temperature t0, in the pipe wall portion 1b where the cavity 8 is located, the temperature change Δt determined by the heat transfer coefficient and thickness of the cavity 8 is caused within the cavity 8. The temperature of the outer surface of the tube where the outer surface of the tube is the tube wall portion 1a is 1H.
The temperature tA determined by said temperature change Δt is higher than
shows. In other words, the difference in thermal effects due to the difference in the filling condition, such as whether or not the concrete 2 is in contact with the inner surface of the filled pipe column 1, causes a temperature difference ΔT=
1. It appears as -1N. Therefore, by photographing the outer surface of the filled pipe column 1 with the infrared camera head 4 immediately after being left still, the filling condition of the concrete 2 in the filled pipe column 1 can be detected as an infrared image on the monitor television 6 or the like.

Therefore, in this method, as described above, by rapidly heating the imaging range of the outer surface of the filled pipe column l and its surroundings with the heater 7, the above-mentioned temperature difference ΔT appearing on the outer surface of the pipe is emphasized immediately after the rapid heating. It is caused by this. Therefore, by photographing with the camera head 4 in this emphasized state, the filling state of the concrete 2 in the filled pipe column l can be clearly detected as an infrared image.

By this method, the concrete 2 in the filled pipe column 1
An example of an infrared image that detects the filling status of is shown in FIG. 7. In FIG. Image 11 is image 10 of filling pipe column l.
In the image of cavity 8 displayed in the section, image 11 of cavity 8
is displayed in a different color from the image 10 of the filling pipe column 1 having a low temperature. Therefore, from the image 10 of the filled pipe column 1 and the image 11 of the cavity 8 in the entire infrared image 9, it is possible to know the position and size of the cavity 8 in the filled pipe column 1, and the filling status of the concrete 2 can be detected. can do.

What must be noted above is that the photographing of the outer surface of the filled vibrator column 1 by the camera head 4 is carried out immediately after the rapid heating by the heater 7. When the filled pipe column 1 is rapidly heated from the outside, the difference in thermal effects due to the difference in the filling condition, whether or not the inner surface is in contact with the concrete 2, is shown in FIG. 6 (A).

This is because the temperature difference on the outer surface of the tube shown in (It) appears as an emphasized state only for a certain period of time immediately after rapid heating. Regardless of whether the heating by the heater 7 is continued after the rapid heating or the heating is stopped, after a while after the rapid heating, the outer surface of the tube becomes uniform in temperature and there is no temperature difference, and the outer surface of the filled pipe column l by the camera head 4 By taking pictures of
It becomes difficult to detect the filling status of concrete 2.

A similar concept is required when rapidly cooling the filling pipe column 1 from the outside.

The heater 7 can be anything, such as an infrared heater or dryer.

The infrared imaging device 3 only needs to have normal performance, and can be a commercially available device. An example of the configuration of the infrared imaging device 3 is schematically shown in FIG.

``Problems to be Solved by the Invention'' The heating means introduced in the above section irradiates radiant heat from an infrared heater or the like at predetermined intervals, but this has the following drawbacks. In other words, as mentioned above, the temperature difference in this detection means can only be detected for a certain period of time immediately after the surface to be inspected is rapidly heated, so the heating must be uniform and rapid for the surface to be inspected for accurate detection. becomes impossible.

However, if the infrared heater is irradiated radially from a position a predetermined distance from the surface to be inspected, such as a round steel pipe,
Each position on the heat-receiving surface cannot receive heat equally due to the difference in the amount of heat received, and there is a layer of air, which is a fluid heat medium, between the heat source and the heat-receiving surface, so when there is wind, heat is removed. It is difficult to ensure uniform heating.

An object of the present invention is to provide a steel pipe heating device for infrared camera detection, which allows the amount of heat received on the surface to be inspected to be uniform and can quickly heat the surface without being affected by the atmosphere in front of the surface to be inspected. The purpose is

"Means for Solving the Problem" In order to achieve the above object, in the heating device of the present invention, a rubber tube is applied to the back side of the rubber sheet-like mat heater that covers the surface to be inspected, and further, the rubber tube is An electromagnetic magnet leg for attraction is integrally filmed on the protrusion portion of the presser plate that is applied to the back surface with a protrusion margin secured.

Alternatively, an air mat that hugs the steel pipe is applied to the back side of the rubber sheet-like mat heater covering the surface to be inspected via tightening belts extending from both ends.

Furthermore, a rubber tube is applied to the back of the rubber sheet-like mat heater that covers the surface to be inspected, and a cloth sheet that hugs the steel pipe is applied to the back of the rubber tube via Velcro bands extending from both ends. It's from Goutoshichino.

``Function'' All mat heaters are backed up by air pressure between each part and are strongly pressed against the surface of the steel pipe to make close contact, so the heat generated evenly over the entire surface is immediately transmitted to the surface of the steel pipe.

Since there is no gap between the heat source and the heat receiving surface, the heat transferred is not affected by the surrounding atmosphere.

"Example" To explain the example with reference to the drawings, Figure 1a,
In b, a rubber tube 16 that can be expanded and contracted is applied to the back surface of a mat heater 14 in the form of a rubber sheet, which is coated on the inspection surface 13a of a steel pipe 13 filled with concrete 12. . Further, a presser plate 17 is applied to the back surface of the rubber tube 16.

The presser plate 17 is covered with the rubber tube 16 in such a manner that a protrusion 17a is secured, and the protrusion 17a is provided with electromagnetic magnet legs 17b for adsorption.
...is integrally formed into a film.

Therefore, if the electromagnetic magnets 17b, . Quick.

Even heat transfer is achieved.

In the figure, 18 is a cavity existing on the inner surface of the steel pipe 13, and 19 is a cord of the mat heater 14.

After heating, by turning off the electromagnetic magnets 17b, etc., it can be easily removed, and the infrared camera can take pictures at a good time.

In FIG. 2, an air mat 20 is applied to the back side of the mat heater 14. 8-year-old air pine)
Tightening bells 21 extend from both ends of 20.

Therefore, with the backup provided by the tightened air mat 20, the mat heater 14 is moved to the surface to be inspected 13a.
If it is placed in close contact with the metal and energized, heat transfer will occur quickly and evenly. In FIG. 3, the heat source can be easily removed by releasing the tightening belt 21. A rubber tube 23 that can be expanded and contracted is attached to the back surface of the mat heater 14 via a hose 22. Further, a cloth sheet 24 is applied to the back surface of the rubber tube 23. Velcro fasteners 25 are attached to both ends of the cloth sheet 24.
A band 26 having a diameter is extended. Therefore, if the band 26 is stopped, the rubber tube 23 is closed, and the mat heater 14 is backed up and brought into close contact with the surface to be inspected 13a and energized, heat can be transferred quickly and evenly. The heat source can be easily removed by removing the Velcro fastener 25 of the band 26.

"Effects of the Invention" Since the present invention is configured as described above, it produces the effects described below.

The heating source is a rubber sheet-like mat heater that can be heated in close contact, evenly, and quickly, and because it is pressed with back-up by air pressure of equal pressure at each location, it is suitable because even close contact can be achieved.

Furthermore, the apparatus according to any of the claims is preferable because it can be quickly attached to and removed from the steel pipe with a single touch.

Furthermore, inexpensive commercially available sheet heaters can be used.
It's advantageous.

[Brief explanation of the drawing]

Figures 1a and b are overhead views and longitudinal cross-sectional views showing how the device of the present invention is used, Figures 2 and 3 are detailed views of the device, and Figure 4 is a steel pipe taken with an infrared camera. Fig. 5 and Fig. 6 a and b are explanatory diagrams of the principle of the means shown in Fig. 4, Fig. 7 is an infrared image obtained by the means shown in Fig. 4, and Fig. 8 is an infrared image. 1 is a schematic diagram of the device configuration of a video device. DESCRIPTION OF SYMBOLS 1... Concrete-filled pipe column, 1a... Pipe wall part, 1b... Pipe wall part, 2... Concrete, 3... Infrared imaging device, 4... Infrared camera head, 5...・Lens, 6... Monitor TV, 7... Heater, 8... Cavity, 9... Infrared whole image, 10... Image, 11... Image, 1
2... Band, 13... Steel pipe, 13a... Surface to be inspected, 14... Mat heater, 15... Hose, 16... Rubber tube, 17... Holding plate, 1
7a... Protrusion allowance, 17b... Electromagnetic magnet leg, 18... Hollow, 19... Cord, 20...
Air mat, 21... Tightening belt, 22... Hose, 23... Rubber tube, 24... Cloth sheet, 25... Velcro fastening, 26... Concrete. Bzoda l 1 puφzu-2 12-1 pashi F" 17-ff eruption 20--1 engineering 1-Makanto 23--Pupyuke Thief

Claims (3)

[Claims] (1) Apply a rubber tube to the back side of the rubber sheet-like mat heater that covers the surface to be inspected, and then apply the rubber tube to the back side of the rubber tube while ensuring an overhang area. A steel pipe heating device for infrared camera detection, characterized by being integrally equipped with electromagnetic magnet legs. (2) For infrared camera detection, characterized in that an air mat that hugs a steel pipe is applied to the back side of a rubber sheet-like mat heater that covers the surface to be inspected via tightening belts extending from both ends. Steel pipe heating equipment. (3) Apply a rubber tube to the back of the rubber sheet-like mat heater that covers the surface to be inspected, and then apply a cloth sheet that hugs the steel pipe to the back of the rubber tube via Velcro bands extending from both ends. A steel pipe heating device for infrared camera detection, which is characterized by a simmering temperature.