JP6389931B1 - Pipe internal deformation inspection system - Google Patents

Abstract

Disclosed is a pipe internal deformation inspection apparatus with dramatically improved accuracy capable of quantitatively grasping a displacement amount (deformation amount) inside a pipe having a circular cross section, and making it numerical and visual display. A moving plate 20 that can move in the Z-axis direction (vertical direction) by a linear shaft, a main shaft 21 that is fixed to the lower surface of the moving plate 20 and extends to the inside of a pipe, and a lower end of the main shaft 21 A pipe inner surface measurement probe 23 that is mounted in the horizontal direction and detects a displacement amount in the radial direction of the pipe, a conversion block 24 that converts a horizontal displacement amount of the pipe inner surface measurement probe 23 into a Z axis direction displacement amount, and a conversion block The displacement amount transmission rod 25 for transmitting the displacement amount converted in the Z-axis direction and the digimatic indicator 29 for inputting the displacement amount from the displacement amount transmission rod 25 and outputting the numerical value to the outside are provided. Digitize and visualize. [Selection] Figure 1

Description

  The present invention relates to a pipe internal deformation inspection apparatus, and more particularly to a pipe internal deformation inspection apparatus such as a so-called hydrant pipe of an airport.

  There is a refueling system called a hydrant system in an aircraft fuel refueling facility. As shown in FIG. 9, the hydrant system means aviation fuel to an apron (parking station) through an apron pipe 51 buried underground through an oil storage tank 53, a hydrant pump 54, a header pit 55 equipped with a shutoff valve, and the like. By opening the hydrant valve 56, the fuel supply system that delivers the fuel can supply the aircraft with as much fuel as necessary.

  Generally, as shown in FIG. 9, the hydrant type oil supply facility has an apron pipe 51 extending horizontally from the header pit 55 that branches into a plurality of pipes, and a rising pipe that extends in a direction perpendicular to the apron pipe 51. The structure is connected to hydrant valves 56 at various places through 52.

  As an example of the rising part of the hydrant pipe, the tip is embedded in the apron ground concrete, and the lower part is buried in the soil, and the ground concrete expands and contracts due to the temperature difference in the summer and winter. It is believed that different stresses are applied. As a result, the valve in the hydrant pit may be inclined and the piping in the soil may be deformed (damaged).

  FIG. 10 (a) schematically shows the state of hydrant piping at the time of piping construction, and FIG. 10 (b) schematically shows the state in which deformation is caused by the application of stress due to pavement expansion and contraction. In FIG. 10, 61 is a hydrant valve, 62 is a ball valve, 63 is a hydrant pit, 64 is a rising pipe, 65 is a buried portion, and 66 is an apron pavement.

  Until now, the only way to check the deformation of piping in the soil was to remove the valves at the end of the piping and apply a simple gauge to the exposed pipe to visually check the deformation.

  FIG. 11 schematically shows a configuration of a pipe deformation measuring jig for confirmation of a conventional buried pipe (pipe cross-sectional shape check), and FIG. 12 schematically shows an image of pipe deformation measurement using the jig of FIG. Shown in The pipe deformation check gauge 72 attached to the tip of the pipe deformation check jig 71 has a fan-shaped two-part structure because the pipe inlet is narrow, and the check work is performed by rotating the operation handle 73. The shape of the pipe deformation check gauge 72 is a fan shape that is the same as the shape of a normal pipe, and the pipe deformation check gauge 72 is aligned with the inside of the pipe to check the degree of deformation. The broken line in the upper diagram of FIG. 12 indicates a normal pipe cross section (perfect circle), and the solid line indicates a deformed pipe cross section. When there is deformation, as shown by S, the presence or absence of a gap between the pipe and the gauge 72 is confirmed, and the report is made with a photograph or the like. In the lower figure of FIG. 12, 74 is a rising pipe and 75 is a hydrant pit.

  With this confirmation method, it is only possible to visually check the deformation state of the inner surface of the pipe, and it is impossible to specifically quantify the amount of deformation, and the data obtained for a large work load is poor in accuracy. Met.

  The amount of inclination of the pipe and the amount of deformation of the inner surface are most correlated with the amount of deformation of the pipe. Although the inner surface deformation measurement is an effective measurement item, the conventional confirmation method has a weakness in accuracy because of visual observation. Therefore, accuracy (quantification) of the deformation amount of the inner surface of the pipe has been desired.

  The present invention eliminates such problems of the prior art, quantitatively grasps the amount of displacement of a pipe having a circular cross section, can be digitized and visualized, and piping with greatly improved measurement accuracy It is an object to provide an internal deformation inspection device.

  According to the present invention, the following technical means are provided to solve the above problems.

  First, a main base plate provided on the end side of a pipe having a circular cross section, a frame and a linear shaft erected on the main base plate, a top base plate provided at the upper end of the frame, and a Z axis by a linear shaft A movable plate movable in the direction (vertical direction), an upper end is fixed to the lower surface of the movable plate, a lower end is attached to the inner side of the pipe via the main base plate, and is attached to the lower end of the main shaft in a horizontal direction. The pipe inner surface measuring probe that traces the inner surface of the pipe at the tip and detects the displacement in the radial direction of the pipe, and the 45 ° inclined surface with respect to the axial direction of the pipe inner surface measuring probe, the horizontal displacement of the pipe inner surface measuring probe An inclined block that converts the amount into displacement in the Z-axis direction, and passes through the main shaft, above the moving plate A displacement amount transmission rod that transmits the displacement amount converted in the Z-axis direction by the inclined block, and a displacement that is arranged on the upper surface side of the moving plate, inputs the displacement amount from the displacement amount transmission rod, and outputs a numerical value to the outside A quantity detection output means, a Z-axis drive servo motor provided on the top base plate and moving the moving plate in the Z-axis direction, a ball screw for transmitting the driving force of the Z-axis driving servo motor to the moving plate, and movement A C-axis drive servo motor is provided on the plate and rotates the main shaft and the pipe inner surface measuring probe 360 ° around the C axis (rotating axis), and the deformation amount inside the pipe is digitized and visualized. A piping internal deformation inspection apparatus is provided.

  Secondly, in the first invention, there is provided a pipe internal deformation inspection device characterized in that the displacement detection output means is a digimatic indicator or a dial gauge.

  Thirdly, in the first or second invention, the pipe internal deformation inspection characterized in that the visualization display can display a circumferential sectional view display, a Z-axis direction longitudinal sectional view display, and a stereoscopic display visualization display. An apparatus is provided.

  Fourth, in any one of the first to third inventions, there is provided a pipe internal deformation inspection device characterized in that the tip of the pipe internal measurement probe has a three-dimensionally rounded shape. The

  Fifthly, in any one of the first to fourth inventions, there is provided a pipe internal deformation inspection device characterized in that the deformation amount inside the pipe at the rising portion of the pipe is digitized and visualized.

  Sixth, in any one of the first to fourth inventions, there is provided a pipe internal deformation inspection apparatus characterized in that the amount of deformation inside the pipe of the fuel supply pipe is digitized and visualized.

  According to the present invention, the displacement amount (deformation amount) inside a pipe having a circular cross section can be quantitatively grasped, digitized and visualized, and the accuracy can be dramatically improved.

  Further, according to the present invention, the displacement amount (deformation amount) inside the pipe can be displayed in a three-dimensional manner.

It is a schematic diagram of the piping internal deformation inspection apparatus of the rising part of the hydrant piping which concerns on one Embodiment of this invention. It is a photograph which shows the whole structure of a piping inner surface measurement probe. It is a schematic diagram which shows the mode of the inside by removing the base plate on the side where the probe probe is attached from the two base plates of the pipe inner surface measurement probe. It is a schematic diagram showing the base plate on the side where the probe probe is attached, the probe probe attached to the base plate, etc. of the two base plates of the pipe inner surface measurement probe. It is a schematic diagram which shows the base plate of the side in which the inclination block is provided among the two base plates of a piping inner surface measurement probe, the inclination block attached to the base plate, etc. It is a figure which shows a mode that the upper end part of a displacement amount transmission rod and the measuring element front-end | tip part of a digimatic indicator contact. It is a figure which shows the shape of normal piping, and its measurement data. It is a figure which shows the shape of piping with a deformation | transformation, and its measurement data. It is explanatory drawing of a hydrant system. (A) is a figure which shows the mode of the hydrant piping at the time of piping construction, (b) is a figure which shows a mode that the stress by pavement expansion / contraction etc. was added. It is a figure which shows typically the structure of the piping deformation | transformation measuring jig for the conventional buried piping confirmation (pipe cross-sectional shape confirmation). It is an image figure which shows typically the mode of the conventional buried piping confirmation (piping cross-sectional shape confirmation) work.

  Hereinafter, the present invention will be described in detail based on embodiments.

  FIG. 1 is a schematic diagram of a pipe internal deformation inspection apparatus at a rising portion of a hydrant pipe according to an embodiment of the present invention.

  In FIG. 1, reference numeral 11 denotes a hydrant pit, and a rising pipe 12 of a hydrant pipe is provided below the hydrant pit and is connected to a ball valve (original valve) 15 via a base flange 13 and an intermediate flange 14. Here, the hydrant valve is removed for inspection.

  A main base plate 16 is disposed above the ball valve 15, and an aluminum frame 17 and a linear shaft 19 are erected on the upper surface thereof. A top base plate 18 is provided at the upper end of the frame 17. The moving plate 20 is guided by the linear shaft 19 and is movable in the Z direction (up and down direction).

  A main shaft 21 is rotatably attached to the lower surface of the moving plate 20. The main shaft 21 is inserted through the main base plate 16 and guided by the main shaft guide 22, and a lower end portion of the main shaft 21 hangs down into the rising pipe 12. A pipe inner surface measurement probe 23 is mounted and fixed in the horizontal direction at the lower end of the main shaft 21, and the tip of the probe is three-dimensionally rounded, tracing the inner surface of the pipe and measuring the amount of displacement in the radial direction of the pipe. It comes to detect. Further, at the lower end of the main shaft 21, there is provided an inclined block 24 which has a 45 ° inclined surface and converts the amount of displacement of the pipe inner surface measuring probe 23 in the horizontal direction into the amount of displacement in the Z-axis direction. On the other hand, a displacement amount transmission rod 25 penetrates inside the main shaft 21 and extends to above the moving plate 20, and transmits the displacement amount converted in the Z-axis direction by the inclined block 24.

  A Z-axis drive servomotor 26 is attached to the top of the top base plate 18, and a rolling ball screw 27 is connected to the drive shaft. The rolling ball screw 27 is a bearing 28 attached to the top base plate 18. The moving plate 20 is moved in the Z-axis direction. In addition, a digimatic indicator 29 is disposed on the upper part of the moving plate 20, and the measuring element contacts the upper end of the displacement amount transmission rod 25, inputs the displacement amount from the displacement amount transmission rod 25, and outputs a numerical value to the outside.

  The moving plate 20 is provided with a C-axis drive servo motor 30, and the driving force is transmitted to the main shaft 21 via the C-axis timing pulley 31, and the main shaft 21 and the pipe inner surface measuring probe 23 are connected to the C-axis ( It can be rotated 360 ° around the rotation axis. The main shaft 21 is provided with a disk (code wheel) having 72 holes drilled at a pitch of 5 °, and a photo interrupter installed on the moving plate 20 side detects this hole, and the timing of signal output The relay activates and transmits data. As a result, 72 points of 5 ° pitch can be accurately output to the measurement personal computer 32 per one rotation of the C-axis. This measurement personal computer 32 performs data processing for visualizing and displaying measurement data (circumferential cross-sectional view display, Z-axis direction vertical cross-sectional view display or three-dimensional display). In order to visualize and display the input data. The visualization program is installed. A commercially available visualization program can be used. Reference numeral 33 denotes a servo control box for controlling the Z-axis drive servomotor 26 and the C-axis drive servomotor 30.

  Here, a mechanism for converting the displacement amount in the pipe radial direction detected by the pipe inner surface measuring probe 23 into the vertical direction by the inclined block 24 and transmitting the displacement amount to the displacement amount transmission rod 25 as the displacement amount in the Z-axis direction is shown in FIGS. 5 will be described in detail.

  FIG. 2 is a photograph showing the overall structure of the pipe inner surface measurement probe 23, and FIG. 3 shows the inside of the two pipes of the pipe inner surface measurement probe 23 with the base plate on the side where the probe probe is attached removed. FIG. 4 is a schematic diagram showing the base plate on the side where the probe probe is attached and the probe probe attached to the base plate of the two base plates, and FIG. 5 is an inclined block 24 of the two base plates. It is a schematic diagram which shows the base plate of the side in which the is provided, the inclination block etc. which are attached to the base plate.

  4 and 5, 35 and 36 are base plates, and 37 and 38 are an upper flange and a lower flange. The upper flange 37 is fixed to the lower end of the main shaft 21 and fixes the upper ends of the base plates 35 and 36. The lower flange 38 fixes the lower end side of the base plates 35 and 36. The main shaft 21 is an axis that holds the entire probe portion at the lower end and rotates it. As described above, the displacement amount transmission rod 25 passes through the main shaft 21.

  As shown in FIG. 4, a linear guide 40 for moving the probe probe 39 in the horizontal direction is attached to the base plate 35 in the horizontal direction. The tip 39A of the probe probe 39 has a substantially hemispherical shape to avoid friction with the inner surface of the pipe. This structure has an advantage that the risk of friction can be avoided when the pipe is a fuel supply pipe. The probe probe 39 is attached to the pedestal block 41, and a guide roller 42 is provided on the upper side of the pedestal block 41. The horizontal movement amount of the probe probe 39 is attached to the base plate 36 by the guide roller 42. Is transmitted to the inclined block 24.

  On the other hand, as shown in FIG. 5, a linear guide 43 for moving the inclined block 24 in the vertical direction is attached to the base plate 36 in the vertical direction. The inclined block 24 has a surface 44 inclined by 45 ° with respect to the vertical direction, and a guide roller sliding groove 45 for sliding the guide roller 42 is formed. When the guide roller 42 moves to the left side of FIG. 4 from a state where it is in contact with the upper left of the guide roller sliding groove 45, the inclined block 24 is guided by the linear guide 43 as shown in FIG. It moves upward in the vertical direction, the horizontal displacement amount of the probe probe 39 is converted into the vertical displacement amount of the inclined block 24, and the displacement amount is transmitted to the displacement amount transmission rod 25. FIG. 5 shows a state in which the probe probe 39 is displaced in the left direction of FIG.

  Next, FIG. 6 shows a state in which the upper end portion of the displacement amount transmission rod 25 and the probe tip portion 29A of the digimatic indicator 29 are in contact with each other. For example, a hollow pipe made of aluminum is used for the displacement transmission rod 25. A sleeve made of fluororesin (Teflon (registered trademark)) is attached to the upper end side, and the tip is a flat plate made of the same resin. ing. This is because when the upper end of the main shaft 21 rotates, the upper end of the displacement transmission rod 25 also rotates, so that the displacement transmission rod 25 and the probe tip 29A of the digimatic indicator 29 do not become a friction surface between metals. Because. This structure has an advantage that the risk of friction can be avoided when the pipe to be measured is a fuel supply pipe. In FIG. 6, 46 is a code wheel and 47 is a photo interrupter.

  Here, an example of a method for transferring data measured by the digimatic indicator 29 to the measurement notebook personal computer 32 will be described. For data transfer, a measurement data wireless system (for example, U-WAVE (registered trademark) manufactured by Mitutoyo Corporation) can be used. In this system, the visualization program (attached to the system) is installed in the measurement notebook personal computer 32, so that data can be taken into Excel (registered trademark) wirelessly from the digimatic indicator 29 side, and data processing for the required visualization display can be performed. Can be done.

  Next, the pipe internal deformation inspection by the pipe internal deformation inspection apparatus having the above configuration will be described.

  First, after a hydrant valve (not shown) is removed from the hydrant pit 11 for inspection, the pipe internal deformation inspection device of this embodiment is installed on the ball valve 15 as shown in FIG. Next, the Z-axis drive servo motor 26 is driven by operating a button or the like of the servo control box 33, the drive force is transmitted to the ball screw 27, and the moving plate 20 is moved to the highest height position set in advance, for example. It is moved along the linear shaft 19.

  Next, the C-axis drive servo motor 30 is driven by operating a button or the like of the servo control box 33 to rotate the main shaft 21 and the pipe inner surface measurement probe 23 by 360 °. While rotating, the radial distance of the contact point between the inner surface of the pipe and the tip 39A of the probe probe 39 is measured with the probe 23 for measuring the inner surface of the pipe, and the distance data is digitally transmitted to the digimatic indicator 29 in the same manner as described above. While being displayed, it is sent as numerical data to the notebook computer 32 for measurement. For data transmission, the photo interrupter detects a hole in the code wheel and transmits the data. As a result, the data of the circumferential direction of the inner surface of the pipe is acquired by outputting the data of 72 points of 5 ° accurately per one rotation of the C axis to the personal computer for measurement.

  When the circumferential data of the inner surface of the pipe at the height position is acquired, the Z-axis drive servo motor 26 is driven by operating the buttons of the servo control box 33, and the moving plate 20 is moved to the next height position. In the same manner as described above, data in the circumferential direction of the inner surface of the pipe at the height position is acquired.

  The above operation is performed at an arbitrary height position, and the circumferential data of the inner surface of the pipe at each height position is acquired. The acquired data is visualized by the measurement notebook personal computer 32 and displayed on the screen or printed out.

  7 and 8 show examples of data visualized and displayed. FIG. 7 shows the shape of a normal pipe and its measurement data, and FIG. 8 shows the shape of the pipe with deformation and its measurement data.

  7A is a diagram showing the shape of a normal pipe, FIG. 7B is a circumferential sectional view, FIG. 7C is an axial longitudinal sectional view, FIG. 7D is a three-dimensional display (perspective view), and FIG. Is a three-dimensional display (side view). From FIG. 7, it can be seen that there is no deformation in the cross-sectional view, and the pipe has a uniform color and no deformation even in the stereoscopic display.

  8A is a view showing the shape of a pipe having deformation, FIG. 8B is a circumferential sectional view, FIG. 8C is an axial longitudinal sectional view, FIG. 8D is a three-dimensional display (perspective view), and FIG. ) Is a three-dimensional display (side view). FIG. 8 shows that deformation is detected by buckling in the cross-sectional view, and buckling and bending are detected even in the three-dimensional display.

  In the above description, the digimatic indicator is used as the displacement detection output means. However, a dial gauge that can output the detected displacement numerically may be used.

11 Hydrant pit 12 Rise piping 15 Ball valve (original valve)
16 Main base plate 17 Frame 18 Top base plate 19 Linear shaft 20 Moving plate 21 Main shaft 23 Piping inner surface measurement probe 24 Inclined block 25 Displacement amount transmission rod 26 Z-axis drive servo motor 27 Ball screw 29 Digimatic indicator 30 C-axis drive servo Motor 32 Measuring notebook PC 33 Servo control box 35, 36 Base plate 37 Upper flange 38 Lower flange 39 Probe probe 40 Linear guide 41 Base block 42 Guide roller 43 Linear guide 44 Inclined surface 45 Guide roller sliding groove 46 Code wheel 47 Photo Interrupter

Claims (6)

A main base plate provided on the end side of a pipe having a circular cross section;
A frame erected on the main base plate, a linear shaft, and a top base plate provided at the upper end of the frame;
A movable plate movable in the Z-axis direction (vertical direction) by a linear shaft;
A main shaft having an upper end fixed to the lower surface of the moving plate and a lower end extending to the inside of the pipe via the main base plate;
A pipe inner surface measurement probe that is mounted horizontally at the lower end of the main shaft, traces the inner surface of the pipe at the tip, and detects the amount of displacement in the radial direction of the pipe;
An inclined block having an inclined surface of 45 ° with respect to the axial direction of the pipe inner surface measurement probe, and converting a horizontal displacement amount of the pipe inner surface measurement probe into a Z axis direction displacement amount;
A displacement amount transmission rod that penetrates through the main shaft, extends to above the moving plate, and transmits the displacement amount converted in the Z-axis direction by the inclined block;
Displacement amount detection output means that is arranged on the upper surface side of the moving plate, inputs the displacement amount from the displacement amount transmission rod, and outputs a numerical value to the outside
A Z-axis drive servo motor provided on the top base plate and moving the moving plate in the Z-axis direction;
A ball screw that transmits the driving force of the Z-axis servo motor to the moving plate;
A C-axis drive servo motor provided on the moving plate and configured to rotate the main shaft and the pipe inner surface measurement probe 360 ° around the C axis (rotation axis);
An apparatus for inspecting internal deformation of a pipe, characterized in that the amount of deformation inside the pipe is digitized and visualized.   2. The pipe internal deformation inspection apparatus according to claim 1, wherein the displacement detection output means is a digimatic indicator or a dial gauge.   The pipe internal deformation inspection apparatus according to claim 1 or 2, wherein the visualization display can perform a circumferential cross-sectional view display, a Z-axis direction vertical cross-sectional view display, and a stereoscopic display visualization display.   The pipe internal deformation inspection apparatus according to any one of claims 1 to 3, wherein a tip of the pipe internal measurement probe has a three-dimensionally rounded shape.   The pipe internal deformation inspection apparatus according to any one of claims 1 to 4, wherein a deformation amount inside the pipe at a rising portion of the pipe is digitized and visualized.   The pipe internal deformation inspection apparatus according to any one of claims 1 to 4, wherein a deformation amount inside the pipe of the fuel supply pipe is digitized and visualized.