JP2933756B2 - In-pipe measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe measuring device for externally measuring rust generated in a pipe or changed pipe thickness.

[0002]

2. Description of the Related Art In general, in buildings such as buildings and condominiums, rust or the like adheres to the inside of pipes such as water supply pipes due to corrosion of iron and the like, and the inside of the pipes is gradually blocked by the formation of such deposits. is there. When the inside of the pipe is blocked in this way, there is a problem that the amount of water or the like supplied through the water supply pipe is reduced or the water quality is deteriorated. It is necessary to confirm and if the thickness exceeds a predetermined value, it is necessary to remove the deposit.

Therefore, conventionally, for example, Japanese Patent Publication No. 60-2573
No. 08 and JP-B-61-274210, a radiation source and a radiation detector are used to detect the amount of radiation attenuation transmitted through a pipe to be measured and to obtain a measured value. Either detect the amount of radiation attenuation in the reference tube using an equivalent reference tube in the absence of any deposits, or obtain a reference value by theoretical calculation and compare the above measured value to this reference value. One that measures the thickness dimension of a kimono has been proposed.

[0004]

Generally, in a water supply pipe, for example, when a considerable time has passed since the start of use, corrosion of the water supply pipe inner surface causes corrosion of rust or the like over the entire circumference of the water supply pipe inner surface. Deposits are often attached.
However, in the prior art described above, the radiation emitted from the radiation source passes through one side of the tube to be measured and then through the other side, and both parts are based on the intensity of the radiation attenuating during this time. Although the thickness of the in-pipe deposits adhering to the pipe is measured in a lump, the situation of the in-pipe deposits over the entire circumference of the pipe to be measured cannot be known.

An object of the present invention is to provide an in-pipe measuring apparatus which can measure the internal condition of a pipe with high accuracy over the entire circumference with a simple structure.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a guide rail having a guide portion provided along a substantially C-shaped perfect circle provided in a circumferential direction outside a pipe to be measured. And a substantially C-shaped slide plate movably engaged with a guide portion of the guide rail and having a plurality of guide devices in a circumferential direction, wherein the slide plate is located on a line substantially passing the center of the pipe to be measured. The transmission source and the reception sensor are fixed to face each other, and two sets of guide devices are provided on the slide plate at a position bridging between the ends of the guide rails by moving the slide plate. The facing distance is substantially equal to the facing distance between the ends of the guide rail.

[0007]

Since the apparatus for measuring deposits in a pipe according to the present invention has the above-described configuration, when the slide plate is moved along the guide rail, when the ends of the guide rail are bridged, the guide devices at both ends are formed. The slide plate is supported, and even if another guide device exists between these guide devices, it does not contribute to the support in the same state at all, so that the configuration of the entire device is simplified with a small number of guide devices after all. In addition, since the transmission source and the reception sensor are fixed on the slide plate so as to face each other, the conditions are constant at any position in the circumferential direction of the pipe to be measured, and accurate measurement can be performed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 and FIG. 2 are a plan view and a rear view of an in-pipe measuring device according to an embodiment of the present invention. As shown in FIG. 2, the whole is configured on the basis of a substantially U-shaped base 1 having a handle 12, and the upper surface of the base 1 has a C-shape having guide portions 2 a and 2 b which are a part of a perfect circular arc. A guide rail 2 is fixed. In the illustrated embodiment, the pipe diameter is 50 to 100 mm.
In consideration of the in-pipe measurement device for the above, a pipe of this diameter can be inserted from the portion where the arc is removed. The slide plate 3 is rotatably engaged along the guide portions 2a and 2b of the guide rail 2.

The guide rail 2 and the slide plate 3
As shown in FIGS. 3 and 4 showing only the guide plate 4a, the slide plate 3 is provided with four sets of guide devices 4A, 4B, 4C, and 4D. , 4b are rotatably supported on a shaft 4c fixed to the slide plate 3, and a guide rail 2 is provided between a pair of guide rollers 4a, 4b.
Are engaged. Slide plate 3 is guide rail 2
Can be rotated clockwise when it is fixed in the state shown in the figure, but the rotation angle is the stoppers 5a, 5b formed on both.
Is regulated by, for example, 180 degrees. Next, the distance between the first guide device 4A and the second guide device 4B counted from the front end in the rotation direction of the slide plate 3 will be described. When the slide plate 3 is rotated clockwise, first, the guide device 4A comes off the left end of the guide rail 2;
The slide plate 3 is configured to be guided along the guide rail 2 while keeping the distance between the slide plates 3 constant by B, 4C, and 4D. This guide device 4B, 4
Since the holding of the slide plate 3 by C and 4D needs to be continued at least until the first guide device 4A reaches the opposite end of the guide rail 4, the first guide device 4A is connected to the opposite end of the guide rail 2. Is reached, the second guide device 4B is positioned near the other end of the guide rail 2. That is, the first guide device 4A and the second guide device 4B are provided at a distance substantially equal to the length of the arc of the removed portion of the guide rail 2, and no guide device is provided between them. This effectively supports the slide plate 3 with a small number of guide devices.

On the upper surface of the slide plate 3 described above,
As shown in FIG. 1, a radiation source 6 and a radiation sensor 7 facing the radiation source 6 are attached. The radiation source 6 and the radiation sensor 7 are opposed to each other on a line passing through the center of a pipe described later, and the opposed relationship does not change even if the slide plate 3 rotates along the guide rail 2. A knob 8 is attached to the upper surface of the slide plate 3 so that the slide plate 3 can be rotated by gripping the knob 8.

As can be seen from FIG. 2, a non-threaded portion of a slide screw 9 which is reversely threaded left and right is rotatably supported between the facing portions of the base 1 described above. One of the arms 1 of the support device 10 is attached to one of the female screw portions 9a having the reverse thread.
The screw portion of the support device 10 is screwed to the screw portion 0a, and the screw portion of the other arm 10b of the support device 10 is screwed to the other male screw portion 9b. For this reason, the knobs 9c, 9
d to rotate in one direction, a pair of arms 10a,
10b move in a direction approaching each other or in a direction separating them. The arms 10a and 10b are arranged opposite to each other so as to sandwich the arc portion from which the guide rail 2 is removed, and a plurality of clips 11 each serving as a contact portion with the pipe are provided at the opposite portions of the arms 10a and 10b. ing. In this embodiment, one arm 10a is provided with a total of four clips 11, two of which are opposed to each other in the outer peripheral direction of the pipe and two of which are opposed to each other in the outer peripheral direction of the pipe at a position separated in the axial direction of the pipe. Is provided. Therefore, knob 9c,
It is gripped by the rotation of the slide screw 9 by 9d.

FIG. 5 is a front view of the in-pipe measuring device shown in FIG. 1, and particularly shows the relationship between the knob 8 and the guide rail 2. As shown in FIG. The knob 8 is configured to move up and down a predetermined distance in the support portion 8a.
Is projected by a spring (not shown) so that the hole 2a
The pivot mechanism is configured so that when the knob 8 is pulled up, the protrusion 8b moves upward against the spring and is housed in the support portion 8a. The guide rail 2 facing the projection 8b has a plurality of holes 2a on the movement locus of the projection 8b moving with the slide plate 3.
Are formed, and engage with the projections 8b to position the slide plate 3. Here, the slide plate 3 is rotated by approximately 180 degrees, which is divided into ten parts to determine the positions of the holes 2a.

At the time of actual measurement, first, as shown in FIGS. 1 and 2, portions of the guide rail 2 and the slide plate 3 from which a part of the arc has been removed are joined together, and the handle 12 supports the entire device while supporting the entire device. Insert the pipe as shown by the two-dot chain line. Next, the knobs 9c and 9d of the slide screw 9 shown in FIG.
The space between a and 10b is narrowed, the pipe is grasped by the clip 11, and the entire apparatus is supported by the pipe by the support device 10 in this manner. In this state, the radiation source 6 and the radiation sensor 7 face each other through substantially the center of the pipe.

Next, a description will be given of a method of measuring the occurrence of rust in a pipe using the pipe measuring device. Basically, by utilizing the fact that radiation attenuates at a constant attenuation rate when passing through an object, the radiation intensity and radiation attenuation coefficient before and after the penetration of the object, the wall thickness of the pipe, and the outer diameter of the pipe are divided. For example, the thickness of the rust in the pipe can be obtained. That is, when the pipe 13 as shown in FIG. 6 is used, the radiation attenuation coefficient of the pipe 13 is μ ₁ , the thickness of the pipe 13 measured using an ultrasonic thickness gauge or the like is t ₁ , t ₁ ′, and the rust 13 a The radiation attenuation coefficient of μ ₂ ,
Assuming that the thickness of the rust 13a is t ₂ , the radiation attenuation coefficient of the water 14 is μ ₃ , and the thickness of the water 14 is t ₃ , the equation (1) in FIG. If the outer diameter of the pipe 13 is φ, the thickness of the water t
₃ = {φ− (t ₁ + t ₁ ′) −t ₂ }, and the above equation (1) becomes the equation (2) in FIG. 7, and the thickness of the rust 13a can be obtained. The thickness of the rust 13a is measured at a plurality of positions on the same circumference of the pipe 13. In that case, first, radiation is irradiated from the radiation source 3 in the state of FIG. The processing based on the above equation (2) is performed. Next, the knob 8 is lifted, and the projection 8b shown in FIG. 5 engages with the next hole 2a, irradiates the radiation from the radiation source 3 again, receives the radiation with the radiation sensor 7, and performs the same processing as the previous case. This operation is repeated a predetermined number of times, but the radiation source 3 and the radiation sensor 7 are both attached to the slide plate 3 at opposed positions, and the position of the guide rail 2 is fixed.
, The measurement can always be performed under the same conditions.

In the above-described embodiment, the first C-shaped slide plate 3 is provided between the first guide device 4a and the second guide device 4b provided at the front end in the rotation direction. When the first guide device 4a is engaged with one end of the guide rail 2 with a distance substantially equal to the facing distance, the second guide device 4b is engaged with the other end of the guide rail 2. However, the number is not limited to the first and second counting from the leading end in the rotation direction of the slide plate 3, but may be the second and third counting. In any case, the bridge between the leading ends of the guide rails 2 may be bridged. The present invention can be applied to two guide devices in the slide plate 3. Although the above-described embodiment has been described with reference to the case where the attached matter in the pipe is measured using the radiation source 6 and the radiation center 7, the present invention can be similarly applied to the case where the thickness of the pipe is measured by ultrasonic waves. It suffices that the transmission source and the reception sensor are arranged to face each other.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, according to the present invention, a slide plate rotating along a guide rail is provided with a plurality of guide devices, and the slide plate is in a state of bridging between the ends of the guide rail opening. A guide device is located at each end of the guide rail, and no other guide device exists between the guide devices. can get. Further, the transmission source and the reception sensor supported on the slide plate do not need to be adjusted each time, and can always carry out the measurement under the same condition, so that the in-pipe measuring device having stable accuracy can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of an apparatus for measuring adhering matter in a pipe according to an embodiment of the present invention.

FIG. 2 is a rear view of the apparatus for measuring a substance adhering to a pipe shown in FIG. 1;

FIG. 3 is a rear view showing only a main part of the pipe attached matter measuring device shown in FIG. 1;

FIG. 4 is a front view of a main part of the pipe attached substance measuring device shown in FIG. 3;

FIG. 5 is a front view of the apparatus for measuring adhering matter in a pipe shown in FIG. 1;

FIG. 6 is a cross-sectional view of a pipe for explaining the principle of measuring the thickness of a substance attached to the pipe.

FIG. 7 is a diagram illustrating mathematical formulas.

[Explanation of symbols]

 2 Guide rail 2a Guide 2b Guide 3 Slide plate 4A Guide 4B Guide 6 Radiation source 7 Radiation center

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Claims (1)

(57) [Claims] 1. An in-pipe measuring device comprising a transmission pipe and a receiving sensor arranged on the outer circumference of a pipe to be measured so as to face the outer circumference of the pipe to be measured along a substantially C-shaped circle. A guide rail having a formed guide portion, and a substantially C-shaped slide plate having a plurality of guide devices in a circumferential direction movably engaged with the guide portion of the guide rail are provided, and a center of the pipe to be measured is provided. The transmission source and the reception sensor are fixed to the slide plate on a line passing through the pair so that the transmission source and the reception sensor are opposed to each other, and two sets of the slide plate at a position bridging the ends of the guide rails by the movement of the slide plate. An in-pipe measuring device comprising a guide device, wherein an opposing distance between the guide devices is substantially equal to an opposing distance between ends of the guide rail.