JP4520766B2 - Rotation position detector - Google Patents

Description

  The present invention is, for example, a rotational position used in a steel pipe inspection and measurement device for inspecting the inner surface of a steel pipe by inserting it into an inclined steel pipe, such as a steel pipe power transmission tower or a steel pipe communication tower. The present invention relates to a detection device.

In a steel pipe structure 100 such as a steel pipe transmission tower or a steel pipe communication tower as shown in FIG. 1, the internal corrosion state is inspected and measured from the top 101 of the steel pipe as illustrated in FIG. The apparatus 102 is inserted and moved, and the presence or absence of corrosion and the state of corrosion are recognized from the video sent from the video camera 103 provided in the steel pipe inspection and measurement apparatus 102. When the corrosion was found, the feeding length of the rope 105 that suspended the steel pipe inspection and measurement device 102 was measured, and the position where the corrosion occurred was grasped. However, in such a method, although the corrosion occurrence position in the height direction can be known, it is impossible to know which position in the circumferential direction of the steel pipe. For this reason, when the steel pipe inspection / measurement device 102 is taken out for repair work and a steel pipe repair device (not shown) is inserted, for example, when a plurality of corrosions occur near the same height position, which corrosion is I had to judge again if I had to repair it. Also, for example, if another corrosion occurs at the same height as the corrosion that was determined to be unnecessary for repair during the previous inspection, which corrosion was found in the previous inspection. It was not possible to determine whether or not it was, and it was necessary to work even on a part that was too early to repair in time.
JP-A-9-229868

  The present invention is intended to provide a rotational position detecting device for a steel pipe inspection and measurement device that can easily and reliably determine the position of the steel pipe in the circumferential direction, which is found by inspection, thereby eliminating unnecessary labor. To do.

  The present invention was invented by paying attention to the fact that in steel pipe structures such as steel pipe power transmission towers and steel pipe communication towers, the steel pipes are installed not at vertical but at an inclination. The rotational position detection device is used in a steel pipe inspection and measurement device for inspecting the inner surface of a steel pipe by inserting it into an inclined steel pipe. The steel pipe inspection and measurement apparatus has a generally cylindrical shape, and is provided with a front camera for photographing the front in the axial direction at the tip, and is configured to be essentially located on the central axis of the steel pipe.

The rotational position detection device of the present invention includes a position indicating member that is spaced apart from the front camera at the front end of the steel pipe inspection and measuring device by a predetermined distance in the axial direction, and holds the position indicating member at the predetermined position. And a support member having at least one support arm. Position indicating member is a bubble type level gauge of the disc-like shape state with a surface of the concave curved surface. The disk- shaped central axis of the bubble level is positioned so as to coincide with the imaging central axis of the front camera of the steel pipe inspection and measurement device.

  When the steel pipe inspection / measurement device is inserted into the steel pipe, an image taken by the front camera is displayed on the monitor. Since there is no obstacle in front of the front camera because the steel pipe inspection and measurement device is located on the central axis of the steel pipe, the monitor will display the part where the light does not reach the inner surface of the steel pipe as a black circle at the center position The In the present invention, basically, the rotational position detecting device is positioned in the black circular portion by being spaced apart from the front camera by a predetermined distance in the axial direction, thereby inspecting the inner surface of the steel pipe. There is no hindrance. Since the air bubble enclosed in the position indicator member always moves upward in the direction of gravity, when corrosion is found on the inner surface of the steel pipe, a line connecting the corrosion position and the center position of the position indicator member, The position of corrosion in the circumferential direction of the steel pipe is specified by measuring the angle formed between the position of the bubble enclosed in the tube and the line connecting the center position of the position indicating member. For this purpose, it is preferable to attach a mark indicating the position to the center position of the position indicating member.

  The position indication member, which is a bubble level, causes halation under the illumination with the brightness required to inspect the inner surface of the steel pipe, making it impossible to grasp the position of the bubble, while reducing the illumination brightness so that halation does not occur. However, it is too dark and it is difficult to grasp the bubble position. For this reason, in this invention, this problem is solved by providing an illumination means so that the inside may be irradiated to the side surface of a position indicating member. When the inside is irradiated from the side surface of the position indicating member, reflection occurs at the boundary surface between the encapsulated liquid and the bubble, and the bubble position can be grasped with low-intensity illumination.

The bubble level that can be used as a position indicating member is not only a conventional bubble level but also a disc-shaped bubble level having a convex curved surface. A bubble level can be used. However, the former conventional bubble level is usually made for the purpose of grasping the degree of inclination, so if the degree of inclination of the steel pipe is small, the moving position does not deviate greatly from the center. Is difficult to distinguish. On the other hand, in the bubble type spirit level of the latter form, since the bubbles always move to a position along the outermost edge, it is possible to easily and reliably determine the upper direction in the gravity direction.

The position indicating member can be made up of a hollow container having a disk-like shape state with a bottom surface of the convex curved surface, and inside sealed mercury or ball of the container. The position indicating member indicates that the position where the mercury or the ball has moved due to gravity is below the gravity direction. Mercury or balls can be used as appropriate by means of appropriate means for identification, such as different colors and brightness between them, so that they are halated by illumination for corrosion inspection, as in bubble level. It will not be difficult to see. The position indicating member also includes an angle indicating plate in the form of a 360-degree protractor, a pivot for pivotally supporting the central portion of the angle indicating plate, and a weight mounted at a position of 0 degrees on the angle indicating plate. It can also consist of. This is because the 0 degree position of the angle indicator plate always points downward in the direction of gravity. The position in the circumferential direction can be specified simply by reading the direction of the corrosion occurrence position.

  According to the present invention, since it is possible to determine the upper or lower direction of gravity from the position indicating member reflected on the monitor screen, it is possible to detect where the corrosion found in the inspection is in the circumferential direction of the steel pipe, thereby Even when a plurality of corrosions occur in the vicinity of the same height position, they can be reliably identified. Further, when a bubble level is used as the position indicating member, it is possible to easily and reliably discriminate the upper or lower direction in the gravity direction by forming it in a disk shape or ring shape having a concave curved surface. In addition, by providing illumination means on the side surface of the bubble level, reflection is performed at the boundary surface between the bubble and the sealed liquid, and the position of the bubble can be clearly displayed on the monitor screen. In addition, by using a combination of a container and mercury or a ball as a position indicating member, not only can a lower position in the direction of gravity be determined, but also a visual differentiation means that facilitates determination of coloring, coating, etc. can be used. Thereby, it can be used without increasing or decreasing the brightness of the illumination for inspection. Furthermore, by using the angle indicator plate, the position in the circumferential direction of the steel pipe can be specified only by reading the angle in the direction in which corrosion occurs.

  As shown in FIGS. 2 to 4, the rotational position detection device 10 according to the embodiment of the present invention is used in a steel pipe inspection / measurement device 102 for inspecting an inner surface of a steel pipe by inserting it into an inclined steel pipe 100. It is done. The steel pipe inspection / measurement device 102 has a generally cylindrical shape, and is provided with a front camera 103 for photographing the front in the axial direction at the tip thereof, essentially on the central axis 104 of the steel pipe 100. It is comprised so that it may be located in.

  The rotational position detection device 10 has a position indicating member 11 disposed at a predetermined distance from the front camera 103 at the front end of the steel pipe inspection and measurement device 102 in the axial direction, and the position indicating member 11 at the predetermined position. The support member 12 includes at least one (two in the illustrated example) support arm for holding. The position indicating member 11 has a disc shape or a ring shape having a convex or concave curved surface or a flat surface, and the center axis of the disc shape or ring shape is that of the front camera 103 of the steel pipe inspection and measurement apparatus 102. Positioned to match the shooting center axis. The distance between the rotational position detection device 10 and the front camera 103 is about the size of a black circular portion that is displayed at the screen center position of a monitor (not shown) and does not reach illumination when there is no obstacle in front of the front camera. It is desirable to select so that the rotational position detecting device 10 is imprinted. What is indicated by reference numeral 13 is illumination for illuminating the inside of the steel pipe when the front camera 103 is photographed.

  In the case of illustration, the position indicating member 11 is a bubble level having a conventional convex curved surface. When the bubble level is used to illuminate the inside of the steel pipe, the illumination 13 generates halation and the bubbles cannot be identified on the monitor screen. On the other hand, if the brightness is lowered so as not to cause halation, There may be a case where air bubbles cannot be identified due to shortage. For this reason, the bubble level of the present invention is equipped with an illumination 14 such as an LED on the side surface so as to illuminate the inside. The light emitted from the illumination 14 is reflected on the boundary surface between the liquid sealed inside and the bubble, and the bubble position is clearly displayed on the monitor screen.

  The bubble level used as the position indicating member 11 is a disk-shaped bubble having a concave curved surface in addition to a disk-shaped bubble level having a conventional convex curved surface (see FIG. 3). An expression level (see FIG. 5), a ring-shaped bubble level (see FIG. 6), or a flat surface (not shown) can be used. Conventional convex curved bubble level is usually made to understand the degree of inclination. For this reason, when the degree of inclination of the steel pipe is small, it is difficult to determine which direction is above the gravitational direction because the moving position of the bubble 11a is located near the center. On the other hand, in a concave curved surface, flat surface, or ring-shaped bubble level, the uppermost position in the direction of gravity in the container is located along the outermost edge, so the bubbles 11a always follow the outermost edge. It has the advantage that it can move at a position and thereby easily and reliably discriminate the upper direction of gravity. Here, although not shown, a mark indicating the center position of the position indicating member is attached to the position indicating member 11 in order to clarify the center position serving as a reference point when measuring the corrosion position described later. Is preferred.

  FIG. 7 is a view showing another form of the position indicating member 11, and has a disk-like form or a ring-like form having a convex or concave curved surface or a flat bottom surface similar to the container of the bubble level. A hollow container (in the illustrated case, a ring-shaped container) 11b and a mercury or ball 11c enclosed in the container 11b. The position indicating member indicates that the position where the mercury or the ball 11c has moved by gravity is below the gravity direction. Mercury or ball 11c can be suitably formed to have an appropriate means for identification, for example, different colors and lightness from the surroundings, so that it is halated by illumination for corrosion inspection, as in the bubble level. It will not be difficult to see.

  FIG. 8 is a view showing still another form of the position indicating member 11, an angle indicating plate 11d in the form of a 360-degree protractor, and a pivot 11e for pivotally supporting the central portion of the angle indicating plate 11d. The weight 11f is mounted at a position of 0 degree on the angle indicating plate 11d. Since the angle indicating plate 11d is rotated by the weight so that the position of 0 degrees always indicates the lower side in the direction of gravity, the corrosion generating position in the circumferential direction can be specified only by reading the direction of the corrosion generating position on the angle indicating plate 11d. .

  Next, a method of using the rotational position detection device 10 according to the present invention configured as described above will be described. First, when the steel pipe inspection / measurement device 102 is inserted into the steel pipe 100, an image captured by the front camera 103 is displayed on the monitor. Since the steel pipe inspection / measurement device 102 is configured to be positioned on the central axis 104 of the steel pipe 100, the position indicating member 11 is displayed at the center position of the monitor screen which is a portion where the illumination on the inner surface of the steel pipe does not reach. When the steel pipe inspection / measurement device 102 is moved up and down by winding or unwinding the rope 105, the inner surface of the steel pipe is projected in a region β excluding the region α shielded by the position indicating member 11.

  When corrosion is found on the inner surface of the steel pipe 100, the raising and lowering of the steel pipe inspection and measuring device 102 is stopped, and the position in the height direction of the steel pipe is specified. On the other hand, the angle θ between the direction X of the bubbles 11a of the position indicating member 11 and the direction Y of the corrosion portion (when the position indicating member 11 is a bubble level) is measured on the monitor screen to thereby measure the steel pipe. Specify the position in the circumferential direction. At this time, when it is difficult to determine the position of the bubble by the illumination 13 for illuminating the inner surface of the steel pipe, the illumination 13 is turned off or the brightness is lowered, and the illumination 14 is turned on to illuminate the inside of the bubble level The position of the bubble can be read.

  When the position indicating member 11 indicates the lower direction of gravity with mercury or a ball as illustrated in FIG. 7, the reference direction is substantially the same as that described above except that the reference direction is opposite to the bubble level. Similarly, the position of the corrosion location in the circumferential direction of the steel pipe is specified. At this time, it will be easily understood that it is not always necessary to turn off the illumination 13 or reduce the luminance. Further, when the position indicating member 11 is in the form of a 360 degree protractor as illustrated in FIG. 8, the position of 0 degree always points downward in the direction of gravity, so the direction of the corrosion position can be read directly.

  The present invention can be used not only for steel pipe power transmission towers and steel pipe communication towers, but also for any steel pipe structure as long as it is installed inclined with respect to the direction of gravity.

It is a figure which shows the example of the steel pipe structure in which the rotation position detection apparatus of this invention is used. It is a figure for demonstrating the case where the test | inspection of the inner surface of a steel pipe is performed using the steel pipe test | inspection measuring device to which the rotational position detection apparatus of this invention is attached. It is a partial side view which shows the state which attached the rotational position detection apparatus of this invention to the steel pipe test | inspection measuring device. It is the top view seen from the IV-IV line of FIG. It is a side view which shows the modification of the position instruction | indication member of a rotational position detection apparatus. It is a top view which shows another modification of the position instruction | indication member of a rotational position detection apparatus. It is a top view which shows another modification of the position instruction | indication member of a rotational position detection apparatus. It is a top view which shows another modification of the position instruction | indication member of a rotational position detection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotation position detection apparatus 11 Position indicating member 11a Bubble 11b Container 11c Mercury or ball 11d Angle indicating plate 11e Axis 11f Weight 12 Support member 13 (For steel pipe illumination) Illumination 14 (For position indicating member) Illumination 100 Steel pipe (steel pipe structure)
DESCRIPTION OF SYMBOLS 101 Top part (steel pipe) 102 Steel pipe inspection measuring device 103 Front camera 104 Center axis (steel pipe) 105 Rope
X Bubble direction
Y Corrosion location direction
α Area shielded by position indicator
β Imaging area inside the steel pipe
θAn angle between the direction of bubbles and the direction of corrosion

Claims (3)

A rotational position detection device used in a steel pipe inspection and measurement device for inspecting the inner surface of a steel pipe by inserting it into a steel pipe installed at an inclination,
The steel pipe inspection and measurement apparatus has a generally cylindrical shape, is provided with a front camera for photographing the front in the axial direction at the tip thereof, and is configured to be essentially located on the central axis of the steel pipe,
The rotational position detecting device is arranged to be spaced apart from the front camera at the front end of the steel pipe inspection and measuring device by a predetermined distance in the axial direction, and to hold the position indicating member at the predetermined position. And a support member having at least one support arm.
As the position indicating member is a bubble type level gauge of the disc-like shape state with a surface of the concave curved surface, the center axis of the disk-shaped of the gas Awashiki spirit level that matches the shooting center axis of the front camera of the steel pipe inspection and measurement device Positioned rotational position detector.   The rotational position detection device according to claim 1, wherein illumination means is provided on a side surface of the position indicating member so as to irradiate the inside thereof. A rotational position detection device used in a steel pipe inspection and measurement device for inspecting the inner surface of a steel pipe by inserting it into a steel pipe installed at an inclination,
The steel pipe inspection and measurement apparatus has a generally cylindrical shape, is provided with a front camera for photographing the front in the axial direction at the tip thereof, and is configured to be essentially located on the central axis of the steel pipe,
The rotational position detecting device is arranged to be spaced apart from the front camera at the front end of the steel pipe inspection and measuring device by a predetermined distance in the axial direction, and to hold the position indicating member at the predetermined position. And a support member having at least one support arm.
The position indicating member is a hollow container having a disk-like shape state with a bottom surface of the convex curved surface, mercury or balls enclosed in the interior of the container so as to indicate the direction of gravity lower position by moving by gravity It consists, the central axis of the circular plate of the container is positioned so as to coincide with the imaging center axis of the front camera of the steel pipe inspection and measurement device, the rotational position detecting device.

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