JP2013040785A - Dimension measuring instrument and dimension measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the dimension of the inside diameter of a relatively small-diameter tube.SOLUTION: A dimension measuring instrument includes: an insertion part 1 to be inserted inside a tube; a sensor part 11 that is provided in the insertion part 1 and measures the radial dimension from a predetermined position to the inner surface of the tube, with it is disposed inside the tube; and a sensor-part moving mechanism 12 that is provided in the insertion part 1 and moves the sensor part 11 in the radial direction of the tube. Even when having a compact sensor part 11 to be inserted into a relatively small diameter tube, which has small sensitivity (having a narrow measuring range H), the dimension measuring instrument can measure the tube inside diameter in a sufficient range by moving the sensor part 11 in the radial direction of the tube. Consequently, the instrument can measure the dimension of the inside diameter of the relatively small-diameter tube.

Description

  The present invention relates to a dimension measuring apparatus and a dimension measuring method for measuring an inner diameter dimension of a tube provided in a nuclear vessel, for example.

  Conventionally, for example, in the reactor vessel nozzle work system described in Patent Document 1, maintenance work inside the reactor vessel nozzle is performed. In this maintenance work, when a defect is detected in the welded part, for example, in the inspection, cutting and repair are performed. At that time, before cutting the defective part, after cutting the defective part, Measure the inner diameter of the corresponding part after the build-up welding and after finishing the build-up weld. In this reactor vessel nozzle work system, the dimension measuring device (dimension measuring unit) is provided so as to be movable along the guide post and the frame on which the guide post is disposed, and images the inner surface of the nozzle. A measurement image acquisition unit, a travel drive unit that causes the measurement image acquisition unit to travel along the guide post, a position sensor that detects a relative position with respect to the nozzle, and an entire range captured by the measurement image acquisition unit And a connected portion attached to the frame (see Patent Document 1: Paragraph 0076 and FIG. 20).

JP 2011-17670 A

  By the way, for example, in a two-loop reactor in which two steam generators are connected, in addition to an outlet nozzle and an inlet nozzle, a water injection pipe is connected to a water injection pipe for injecting cooling water into the reactor. Is provided. Even in the welded portion between the water injection nozzle and the water injection pipe, it is necessary to measure the inner diameter for maintenance.

  However, the above-described dimension measuring apparatus of Patent Document 1 is applied to the measurement of the inner diameter of an outlet nozzle or an inlet nozzle having an inner diameter of approximately 740 mm, and is inserted into a water injection nozzle having an inner diameter of approximately 92 mm or 87 mm. It is not possible. Therefore, a dimension measuring apparatus that can be inserted into a small-diameter pipe such as a water injection nozzle and that can measure the inner diameter dimension is desired.

  The present invention solves the above-described problems, and an object thereof is to provide a dimension measuring apparatus and a dimension measuring method capable of measuring a relatively small pipe inner diameter dimension.

  In order to achieve the above-described object, the dimension measuring device of the present invention includes an insertion portion that is inserted into a tube, and the insertion portion that is provided in the insertion portion and disposed in the tube from a predetermined position. A sensor unit that measures a radial dimension reaching an inner surface of a tube, and a sensor unit moving mechanism that is provided in the insertion unit and moves the sensor unit in the radial direction of the tube.

  According to this dimension measuring apparatus, even when the sensitivity is small (the measurement range H is narrow) in a small sensor unit that can be inserted into a relatively small diameter tube, the sensor unit is moved in the radial direction of the tube. A sufficient range of tube inner diameter can be measured. As a result, it is possible to measure a relatively small pipe inner diameter.

  In the dimension measuring apparatus of the present invention, the sensor unit moving mechanism includes a guide unit that guides the movement of the sensor unit in the radial direction of the tube, and a drive source unit that reciprocates along the axial direction of the tube. And a link part that converts the reciprocating operation of the drive source part into the moving direction of the sensor part.

  According to this dimension measuring apparatus, since the drive source unit reciprocates along the axial direction of the tube, the sensor unit moving mechanism that moves the sensor unit in the radial direction of the tube can increase the size of the tube in the radial direction. Therefore, the apparatus can be reduced in size.

  Moreover, the dimension measuring apparatus of the present invention is characterized in that the sensor unit moving mechanism further includes a defining unit that defines a moving position of the sensor unit.

  According to this dimension measuring apparatus, by defining the position where the sensor unit has moved, the reproducibility of the moving position of the sensor unit can be improved and the measurement accuracy of the sensor unit can be maintained.

  In the dimension measuring device of the present invention, the sensor unit and the sensor unit moving mechanism are disposed within the range of the outer shape of the insertion portion, and formed larger at the insertion end of the insertion portion than the outer shape of the insertion portion. And a tip portion formed so as to be insertable inside the tube.

  According to this dimension measuring apparatus, when the dimension measuring apparatus is installed in the pipe, the insertion part is inserted into the pipe. By providing the distal end part at the insertion end of the insertion part, the insertion part itself is provided by the distal end part. Alternatively, it is possible to prevent a situation where a sensor unit or a sensor unit moving mechanism provided in the insertion unit collides with the inner surface of the tube.

  In addition, the dimension measuring apparatus of the present invention includes a support rod that disposes the insertion portion inside the tube, a rotational movement mechanism that rotates the support rod around the axis of the tube, and the support rod that moves the tube to the tube. An axial movement mechanism for moving along the axial direction is arranged outside the tube.

  According to this dimension measuring apparatus, the sensor portion arranged in the insertion portion is rotated about the axis of the tube by rotating the support rod about the axis of the tube by the rotational movement mechanism, so that the inner surface in the circumferential direction of the tube A shape is obtained. In addition, by moving the support rod along the axial direction of the tube by the axial movement mechanism, the sensor portion arranged in the insertion portion moves along the axial direction of the tube, so that the inner surface shape in the axial direction of the tube is obtained. It is done. By arranging these rotational movement mechanisms and axial movement mechanisms outside the pipe, it is possible to measure a relatively small pipe inner diameter without arranging the mechanism inside the pipe.

  In order to achieve the above-described object, the dimension measurement method of the present invention is an axial measurement in which a sensor unit is moved in the axial direction of a pipe to measure a radial dimension from a predetermined position in the pipe to the inner surface of the pipe. Each step obtained by each of the above steps, including a step, and a circumferential direction measuring step of measuring a radial dimension from a predetermined position in the tube to the inner surface of the tube by moving the sensor unit in the circumferential direction of the tube In the dimension measuring method for obtaining the inner surface shape of the pipe from the radial dimension, the radial dimension from the predetermined position to the inner surface of the pipe deviates from the measurement range by the sensor unit in the axial direction measuring step and the circumferential direction measuring step. In this case, the method further includes a re-measurement step in which each of the steps is performed again by moving the sensor unit in the radial direction of the tube, and the inner surface shape of the tube obtained by the re-measurement step, the axial direction measurement step, and the Circumferential direction And wherein the combining the inner shape of the pipe obtained by the measurement process.

  According to this dimension measurement method, even if the sensitivity is small (the measurement range H is narrow) in a small sensor unit that can be inserted into a relatively small-diameter tube, the sensor unit is moved in the radial direction of the tube and reused. By performing the measurement process, a sufficient range of tube inner diameter dimensions can be measured. As a result, it is possible to measure a relatively small pipe inner diameter.

  According to the present invention, it is possible to measure a relatively small pipe inner diameter.

FIG. 1 is a schematic diagram illustrating an example of a nuclear facility. FIG. 2 is a cross-sectional view of the reactor vessel. FIG. 3 is a cross-sectional view of the water injection nozzle. FIG. 4 is an explanatory diagram of cutting and repairing of the water injection nozzle. FIG. 5 is an explanatory diagram of cutting and repairing of the water injection nozzle. FIG. 6 is a side view showing a part of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 7 is an overall perspective view of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 8 is a perspective view of a part of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 9 is a perspective view of a part of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 10 is a block diagram of a control system of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 11 is a side view showing the operation of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 12 is a side view showing the operation of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 13 is a side view showing the operation of the dimension measuring apparatus according to the embodiment of the present invention. FIG. 14 is a side view showing the operation of the dimension measuring apparatus according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic view showing an example of a nuclear facility, and FIG. 2 is a cross-sectional view of a nuclear reactor vessel. As shown in FIG. 1, the nuclear power facility 100 includes, for example, a pressurized water reactor (PWR: Pressurized Water Reactor). In this nuclear power facility 100, a reactor vessel 101, a pressurizer 102, a steam generator 103, and a pump 104 are sequentially connected by a primary cooling water pipe 105 to constitute a circulation path of primary cooling water. Further, a circulation path of secondary cooling water is configured between the steam generator 103 and the turbine (not shown).

  In this nuclear power facility 100, the primary cooling water is heated in the reactor vessel 101 to become high temperature and high pressure, and steam is generated through the primary cooling water pipe 105 while being pressurized by the pressurizer 102 to keep the pressure constant. Is supplied to the vessel 103. In the steam generator 103, heat exchange between the primary cooling water and the secondary cooling water is performed, whereby the secondary cooling water evaporates and becomes steam. The secondary cooling water converted into steam by heat exchange is supplied to the turbine. The turbine is driven by the secondary cooling water steam. Then, the power of the turbine is transmitted to a generator (not shown) to generate electricity. The steam used for driving the turbine is condensed into water and supplied to the steam generator 103. On the other hand, the primary cooling water after heat exchange is collected on the pump 104 side via the primary cooling water pipe 105.

  As shown in FIG. 1, the steam generator 103 is provided with an inlet-side water chamber 103a and an outlet-side water chamber 103b partitioned by a partition plate 103c in the lower part formed in a hemispherical shape. The inlet side water chamber 103a and the outlet side water chamber 103b are separated from the upper side of the steam generator 103 by a tube plate 103d provided on the ceiling portion. On the upper side of the steam generator 103, an inverted U-shaped heat transfer tube 103e is provided. The end portion of the heat transfer tube 103e is supported by the tube plate 103d so as to connect the inlet side water chamber 103a and the outlet side water chamber 103b. The inlet-side water chamber 103a is provided with an inlet nozzle 103f as a piping nozzle, and an inlet-side primary cooling water pipe 105 is connected to the inlet nozzle 103f. On the other hand, the outlet side water chamber 103b is provided with an outlet pedestal 103g as a piping nozzle, and the outlet side primary cooling water pipe 105 is connected to the outlet pedestal 103g.

  As shown in FIG. 1, the nuclear reactor vessel 101 includes a vessel main body 101a and a vessel lid 101b mounted on the upper portion thereof so that a fuel assembly (not shown) can be inserted and removed. The container lid 101b is provided so as to be openable and closable with respect to the container main body 101a. The container body 101a has a cylindrical shape with an upper opening and a lower hemispherical shape that is closed, and an upper part is provided with an inlet nozzle 101c and an outlet nozzle 101d for supplying and discharging light water as primary cooling water. Yes. A primary cooling water pipe 105 is connected to the outlet nozzle 101 d so as to communicate with the inlet nozzle 103 f of the steam generator 103. Moreover, the primary cooling water pipe 105 is connected to the inlet nozzle 101 c so as to communicate with the outlet nozzle 103 g of the steam generator 103. In addition, as shown in FIG. 2, the reactor vessel 101 is provided with a water injection nozzle 101e, which is a pipe for water injection, at the same height as the inlet nozzle 101c and the outlet nozzle 101d in the vessel main body 101a. Yes. A water injection pipe 101f which is a pipe is connected to the water injection pipe base 101e by welding.

  FIG. 3 is a cross-sectional view of the water injection nozzle, and FIGS. 4 and 5 are explanatory diagrams of cutting and repairing of the water injection nozzle. The water injection nozzle 101e is periodically inspected in order to ensure the safety and reliability of the nuclear facility 100 described above. As a result of this inspection, there is a possibility that surface defects such as cracks due to secular change may occur in the welded portion 101g, which is a connecting portion between the water injection nozzle 101e and the water injection piping 101f, as shown in FIG. When a defect is found, the weld 101g is cut and repaired. Specifically, as shown in FIG. 4, the inner surface of the welded portion 101g is cut together with part of the inner surfaces of the water injection nozzle 101e and the water injection piping 101f, and a weld overlay of a predetermined alloy type is applied to the cut cutting portion A. B is performed, and the portion where the welding overlay B is performed and the periphery thereof are finished. Further, when there is a risk of occurrence of a defect or the defect is deep from the inner surface of the welded portion 101g, as shown in FIG. 5, the inner surface of the welded portion 101g is part of the inner surfaces of the water injection nozzle 101e and the water injection pipe 101f. Then, the welded part B of a predetermined alloy type is applied to the cut part A that has been cut, and the welded part B and its periphery are finished. The shallow cutting and overlaying shown in FIG. 4 are performed along the entire circumference of the inner surface of the water injection nozzle 101e. Further, the deep cutting and overlaying shown in FIG. 5 are performed along the local portion or the entire circumference of the inner surface of the water injection nozzle 101e.

  The dimension measuring device according to the present embodiment is applied to measure the inner diameter of the relevant part before cutting, after cutting, after welding and after finishing at the above-mentioned cutting / repair location. 6 is a partially cutaway side view of the dimension measuring apparatus according to the present embodiment, FIG. 7 is an overall perspective view of the dimension measuring apparatus according to the present embodiment, and FIGS. It is a one part perspective view of the dimension measuring device concerning this embodiment.

  The dimension measuring device is inserted inside the above-described reactor vessel 101 and into the pipe from the water injection pipe stand 101e to the water injection pipe 101f. As shown in FIG. 6 and FIG. It has the insertion part 1 inserted, and the cylindrical support rod 2 which arrange | positions the said insertion part 1 inside a pipe | tube.

  As shown in FIGS. 6 to 9, the insertion portion 1 is formed with a diameter smaller than the inner diameter of the tube so as to be inserted into the tube, and an axis S <b> 1 along the extending direction (axial direction) of the tube. A plate-like body extending to The insertion unit 1 includes a sensor unit 11, a sensor unit moving mechanism 12, and an imaging unit 13.

  The sensor unit 11 is for measuring a radial dimension from a predetermined position to an inner surface of a pipe that is a measurement object in a state of being arranged inside the pipe. The sensor unit 11 is, for example, a combination of a light emitting element (semiconductor laser) and an optical position detection element (PSD: Position Sensitive Detector). A laser displacement sensor that detects the amount of displacement from a predetermined position to the object by condensing a part of the light beam diffused and reflected from the measurement object onto the optical position detection element by the light receiving lens. Applied.

  The sensor unit moving mechanism 12 is for moving the sensor unit 11 in the radial direction of the tube (a direction perpendicular to the axis S1). The sensor unit moving mechanism 12 includes a guide unit 121, a drive source unit 122, a link unit 123, and a defining unit 124.

  The guide part 121 guides the movement of the sensor part 11 in the radial direction of the pipe, and a pair of rail members 121a fixed to the insertion part 1 so as to extend in the radial direction and the rail member. It includes a moving member 121b provided to be movable along the longitudinal direction (radial direction) of 121a. The sensor unit 11 is fixed to the moving member 121b, and is provided so as to be movable in the radial direction as the moving member 121b moves.

  The drive source unit 122 is an actuator, and an air cylinder is applied in the present embodiment. The drive source portion 122 is provided in the insertion portion 1 so as to reciprocate along the axial direction of the tube.

  The link part 123 is connected to the actuator of the drive source part 122 and the moving member 121b of the guide part 121, and the reciprocating operation of the drive source part 122 in the axial direction is performed by the moving member 121b (sensor part 11). Convert to radial movement.

  The stroke in which the reciprocating operation in the axial direction of the drive source unit 122 is converted into the radial movement of the moving member 121b (sensor unit 11) is within the range of the radial dimension of the insertion unit 1 by the sensor unit 11. That is, the movement of the sensor unit 11 is within the range of the outer shape of the insertion unit 1, and the sensor unit 11 does not contact the inner surface of the tube in a state where the insertion unit 1 is inserted into the tube.

  The defining portion 124 is a pin member fixed to the insertion portion 1, and is provided on one side and the other side of the movement of the moving member 121b in the radial direction. When the moving member 121b moves in the radial direction, the defining unit 124 defines the moving position of the moving member 121b (sensor unit 11) by abutting on one side and the other side thereof.

  The imaging unit 13 includes a solid-state imaging device (CCD: Charge Coupled Device) that is an imaging unit and a light emitting diode (LED) that is an illuminating unit, and is illuminated by the illuminating unit. The range is imaged by the imaging means. Further, in the imaging unit 13 of the present embodiment, the cylindrical body is provided in the longitudinal direction along the axial direction of the tube, and the irradiation direction of the illumination unit and the imaging direction of the imaging unit are arranged in a direction intersecting the axial direction by the mirror. It has been changed. The imaging unit 13 images a position where the sensor unit 11 irradiates the measurement target (inner surface of the tube) with the light of the semiconductor laser.

  As described above, the insertion unit 1 including the sensor unit 11, the sensor unit moving mechanism 12, and the imaging unit 13 is formed in an outer shape that can be inserted into the tube, and the sensor unit 11 is within the range of the outer shape. The sensor unit moving mechanism 12 and the imaging unit 13 are disposed. And the insertion part 1 is provided with the front-end | tip part 14 in the insertion end which is a front-end | tip of the insertion to a pipe | tube. The distal end portion 14 is made of, for example, ultra-high molecular polyethylene excellent in wear resistance, impact resistance, chemical resistance, etc., and is formed larger than the outer shape of the insertion portion 1 and can be inserted into the tube. It is formed in a large size.

  In addition, the insertion portion 1 is provided with a fixing portion 15 at the rear end that is opposite to the axial direction of the insertion end. The fixing portion 15 is formed in a cylindrical shape, and is fixed to the support rod 2 with a screw while inserting the tip of the support rod 2. Further, the cable 11 a of the sensor unit 11, the cable (air tube in this embodiment) 122 a of the drive source unit 122 of the sensor unit moving mechanism 12, and the cable 13 a of the imaging unit 13 are inserted into the fixed unit 15. And is inserted into the cylindrical support rod 2.

  The support rod 2 arranges the insertion portion 1 fixed to the tip described above inside the tube. As shown in FIG. 7, the support rod 2 has a ball spline groove 21 and a ball screw groove 22 in the longitudinal direction on the outer peripheral surface extending from the distal end to which the insertion portion 1 is fixed to the rear end opposite to the axial direction. It is provided along. Although a single ball spline groove 21 is shown in FIG. 7, a plurality of ball spline grooves 21 may be provided.

  As shown in FIG. 6, the support rod 2 has a rear end protruding outside the tube (inside the reactor vessel 101) in a state where the insertion portion 1 is disposed inside the tube. A support rod moving portion 3 is provided on the rear end side of the support rod 2 protruding outside the tube. The support rod moving unit 3 includes a rotational moving mechanism 31 and an axial direction moving mechanism 32.

  The rotational movement mechanism 31 rotates the support rod 2 around the tube axis. As shown in FIGS. 6 and 7, the rotational movement mechanism 31 includes a cylindrical inner cylinder 312 inside a cylindrical outer cylinder 311. The inner cylinder 312 is provided to be rotatable relative to the outer cylinder 311 around the axis S1. The inner cylinder 312 has a ball spline 313 that engages with the ball spline groove 21 of the support rod 2 fixed to the inside of the front end side around the axis S1. The support rod 2 and the inner cylinder 312 are relatively movable in the extending direction (axial direction) of the shaft S1 by the engagement of the ball spline groove 21 and the ball spline 313, but the shaft S1 rotates around the shaft S1. It is not a relationship. Further, the rear end side of the inner cylinder 312 extends to the outside of the outer cylinder 311, and a driven gear 314 centered on the axis S <b> 1 is fixed to the outside of the rear end side. The driven gear 314 is meshed with a drive gear (not shown) composed of a non-backlash gear provided on the output side of the rotary drive motor 315 fixed to the outer cylinder.

  The outer cylinder 311 is provided with a flange 311a that protrudes from the outer surface thereof. As shown in FIG. 6, the outer cylinder 311 has a bottomed cylindrical platform that constitutes an aerial working environment inside the reactor vessel 101 outside the pipe (the platform of JP2011-17670 A). Corresponding) is fixed to 106. Specifically, the platform 106 is provided with a circular window hole 106a leading to a pipe on a cylindrical side wall, and an attachment base 107 is fixed to the window hole 106a. The mounting base portion 107 is formed in a cylindrical shape, and is provided with a flange 107a that protrudes to the outer periphery of an end portion disposed in the platform 106 in a state of being inserted into the window hole 106a. The attachment base 107 is fixed to the window hole 106a with the cylindrical center aligned with the axis of the tube. The outer cylinder 311 is inserted through the attachment base 107 and the flange 311a is fixed to the flange 107a of the attachment base 107, so that the axis S1 of the support rod 2 is attached to the axis of the tube.

  In the rotational movement mechanism 31 configured as described above, when the driven gear 314 is rotated by the rotation drive motor 315, the inner cylinder 312 and the ball spline 313 are rotated around the axis S1 together with the driven gear 314. Then, the support rod 2 with which the ball spline groove 21 is engaged with the ball spline 313 rotates around the axis S1. For this reason, the insertion portion 1 fixed to the tip of the support rod 2 rotates around the axis S1. As a result, the sensor part 11 provided in the insertion part 1 rotates around the axis S1, and the radial dimension in the circumferential direction of the pipe is measured.

  The axial direction moving mechanism 32 moves the support rod 2 along the axial direction of the pipe. As shown in FIGS. 6 and 7, the axial movement mechanism 32 is provided with a ball screw nut 321 that engages with the ball screw groove 22 of the support rod 2 while inserting the support rod 2 inside the inner cylinder 312. ing. The ball screw nut 321 has a driven gear 322 around the axis S1 fixed to the rear end thereof. The driven gear 322 is meshed with a drive gear (not shown) composed of a non-backlash gear provided on the output side of the axial drive motor 323 fixed to the inner cylinder 312. The axial movement mechanism 32 includes the ball spline 313 of the rotational movement mechanism 31 in its configuration.

  In the axial movement mechanism 32 configured as described above, when the driven gear 322 is rotated by the axial drive motor 323, the ball screw nut 321 is rotated around the axis S1 together with the driven gear 322. Then, the support rod 2 in which the ball screw groove 22 is engaged with the ball screw nut 321 and the ball spline groove 21 is engaged with the ball spline 313 is controlled to rotate around the axis S1 by the ball spline 313. The ball screw groove 22 is engaged with the ball screw nut 321 to move in the axial direction. As a result, the sensor part 11 provided in the insertion part 1 moves in the axial direction, and the radial dimension in the axial direction of the pipe is measured. The axial movement mechanism 32 is rotated together with the rotation of the inner cylinder 312 by the rotation movement mechanism 31.

  FIG. 10 is a block diagram of a control system of the dimension measuring apparatus according to the present embodiment. The above-described dimension measuring apparatus includes the sensor unit 11, the drive source unit 122 of the sensor unit moving mechanism 12 (in this embodiment, the air supply unit to the drive source unit 122), the imaging unit 13, and the rotational drive motor of the rotational movement mechanism 31. 315 and an axial drive motor 323 of the axial movement mechanism 32 are connected to the control unit 4.

  The control unit 4 is configured by a microcomputer or the like, and a storage unit 41 and a calculation unit 42 are connected to the control unit 4. The storage unit 41 includes a RAM, a ROM, and the like, and stores programs and data. The data stored in the storage unit 41 includes data on the rotation angle of the support rod 2 (the circumferential position of the sensor unit 11) accompanying the driving of the rotation drive motor 315, and the data of the support rod 2 accompanying the driving of the axial drive motor 323. There are data on the amount of axial movement (axial position of the sensor unit 11) and data on the radial position of the sensor unit 11 driven by the drive source unit 122. The computing unit 42 computes the radial dimension of the pipe based on the displacement amount (dimension data) detected by the sensor unit 11. Although not shown in the figure, the control unit 4 can display the calculation result of the radial dimension by the calculation unit 42 by being connected to a display unit.

  Specifically, the operation of the dimension measuring apparatus by the control unit 4 will be described. FIGS. 11-14 is a side view which shows operation | movement of the dimension measuring apparatus based on this Embodiment. The operation of this dimension measuring apparatus is performed by inspecting a target pipe (for example, a welded portion 101g of the water injection pipe base 101e and the water injection pipe 101f), and if the pipe may be defective or has a defect, This is for measuring the inner diameter. In this case, as shown in FIG. 6, a dimension measuring device is installed in the target tube. At this time, the distal end portion 14 has an outer shape larger than the configuration of the insertion portion 1, the sensor portion 11, the sensor portion moving mechanism 12, the imaging portion 13, etc., and the distal end portion 14 is inserted in the insertion of the insertion portion 1 into the tube. By contacting the inner surface of the tube, the structure can be guided into the tube without contacting the inner surface of the tube.

  First, as shown in FIG. 11, before the repair, the inner diameter of the tube before cutting is measured. Here, the sensor unit 11 is moved in the radial direction in a direction away from the inner surface of the tube (center side of the tube), and a measurement range H including the inner surface of the tube is obtained. Then, the rotational drive motor 315 of the rotational movement mechanism 31 and the axial direction drive motor 323 of the axial direction movement mechanism 32 are driven to rotate the sensor unit 11 around the axis S1 together with the insertion unit 1, and together with the insertion unit 1. The sensor portion 11 is moved in the axial direction along the axis S1 to measure the inner diameter dimension of the tube. The inner diameter detected by the sensor unit 11 is detected at several locations around the axis S1 at predetermined angular intervals and at several locations at predetermined intervals in the axial direction along the axis S1.

  Next, as shown in FIG. 12, the inner diameter of the tube after cutting is measured. In this case, the entire inner circumference of the welded portion 101g is cut relatively shallow together with a part of the inner surfaces of the water injection pipe base 101e and the water injection pipe 101f. Here, the sensor unit 11 is moved in the radial direction in a direction away from the inner surface of the tube (center side of the tube), and a measurement range H including the inner surface of the tube is obtained. Then, the rotational drive motor 315 of the rotational movement mechanism 31 and the axial direction drive motor 323 of the axial direction movement mechanism 32 are driven to rotate the sensor unit 11 around the axis S1 together with the insertion unit 1, and together with the insertion unit 1. The sensor portion 11 is moved in the axial direction along the axis S1 to measure the inner diameter dimension of the tube. As described above, the inner diameter size detected by the sensor unit 11 is detected at several predetermined angular intervals around the axis S1 and at several predetermined axial intervals along the axis S1.

  Next, as shown in FIG. 12, the inner diameter dimension of the pipe after overlay welding (indicated by a broken line in FIG. 12) is measured. Here, the sensor unit 11 is moved in the radial direction in a direction away from the inner surface of the tube (center side of the tube), and a measurement range H including the inner surface of the tube is obtained. Then, the rotational drive motor 315 of the rotational movement mechanism 31 and the axial direction drive motor 323 of the axial direction movement mechanism 32 are driven to rotate the sensor unit 11 around the axis S1 together with the insertion unit 1, and together with the insertion unit 1. The sensor portion 11 is moved in the axial direction along the axis S1 to measure the inner diameter dimension of the tube. As described above, the inner diameter size detected by the sensor unit 11 is detected at several predetermined angular intervals around the axis S1 and at several predetermined axial intervals along the axis S1. Moreover, after finishing the build-up welded part, the inner diameter dimension is similarly measured.

  In this way, in pipe repair, before cutting the defective part, after cutting the defective part, after build-up welding of the cut part, and after finishing the build-up welded part, the inner diameter dimension of the corresponding part is measured by the dimension measuring device. By doing so, the inner surface shape of the tube in each state is obtained. Thereby, cutting, overlay welding, and finishing can be performed based on the inner surface shape of the obtained tube, and the inner surface shape of the tube after finishing can be confirmed.

  Further, when there is a risk of occurrence of a defect or the defect is deep from the inner surface of the welded part 101g (see FIG. 5), before cutting the defective part, after build-up welding of the cut part, and finishing the build-up welded part After processing, the inner diameter dimension of the corresponding part is measured by a dimension measuring device in the same manner as described above.

  Then, after cutting the defective portion, as shown in FIG. 13, if the sensor unit 11 is moved in the radial direction in the direction away from the inner surface of the tube (center side of the tube), the tube is moved from a predetermined position. Since a portion in which the radial dimension reaching the inner surface deviates from the measurement range H by the sensor unit 11 is generated, the inner diameter dimension cannot be measured corresponding to the depth after cutting. This can be determined by the fact that the detection signal of the sensor unit 11 cannot be obtained from the portion where the inner diameter dimension cannot be measured. In such a case, as shown in FIG. 13, the measurement is performed in a state where the sensor unit 11 is once moved in the radial direction in the direction away from the inner surface of the tube (center side of the tube), and the detection signal of the sensor unit 11 is detected. As shown in FIG. 14, the sensor unit 11 is moved in the radial direction in the direction approaching the inner surface of the tube (the inner surface of the tube), and the measurement range H is slid in the radial direction. Then, as remeasurement, the rotational drive motor 315 of the rotational movement mechanism 31 and the axial direction drive motor 323 of the axial direction movement mechanism 32 are driven to rotate the sensor unit 11 around the axis S1 together with the insertion unit 1, and The inner diameter dimension of the pipe is measured by moving the sensor section 11 together with the insertion section 1 in the axial direction along the axis S1. The inner diameter detected by the sensor unit 11 is detected at several locations around the axis S1 at predetermined angular intervals and at several locations at predetermined intervals in the axial direction along the axis S1. Then, the inner surface shape of the tube obtained by re-measurement is combined with the inner surface shape of the tube obtained by previous measurement. In this case, the measurement range H in a state in which the sensor unit 11 is moved in the radial direction in the direction away from the inner surface of the tube (center side of the tube) and the direction in which the sensor unit 11 approaches the inner surface of the tube (inner surface of the tube) The inner surface shapes can be combined with each other by partially overlapping the measurement range H in a state of being moved in the radial direction.

  In this way, the inner surface shape of the pipe can be obtained even when there is a risk of defects or when the defects are located deep from the inner surface of the welded portion 101g.

  As described above, the dimension measuring apparatus according to the present embodiment includes the insertion portion 1 to be inserted into the tube, and the inner surface of the tube from a predetermined position provided in the insertion portion 1 and disposed inside the tube. And a sensor unit moving mechanism 12 that is provided in the insertion unit 1 and moves the sensor unit 11 in the radial direction of the pipe.

  According to this dimension measuring apparatus, even when the sensitivity is small (the measurement range H is narrow) in the small sensor unit 11 that can be inserted into a relatively small diameter tube, the sensor unit 11 is moved in the radial direction of the tube. Thus, it is possible to measure a sufficient range of the inner diameter of the tube. As a result, it becomes possible to measure the inner diameter of the tube having a relatively small diameter.

  Further, in the dimension measuring apparatus of the present embodiment, the sensor unit moving mechanism 12 includes a guide unit 121 that guides the movement of the sensor unit 11 in the radial direction of the tube, and a drive source that reciprocates along the axial direction of the tube. Part 122 and a link part 123 that converts the reciprocating operation of the drive source part 122 into the moving direction of the sensor part 11.

  According to this dimension measuring apparatus, since the drive source unit 122 reciprocates along the axial direction of the tube, the sensor unit moving mechanism 12 that moves the sensor unit 11 in the radial direction of the tube moves the tube in the radial direction of the tube. The increase in size can be prevented, and the apparatus can be reduced in size.

  In the dimension measuring apparatus according to the present embodiment, the sensor unit moving mechanism 12 further includes a defining unit 124 that defines the moving position of the sensor unit 11.

  According to this dimension measuring apparatus, it is possible to improve the reproducibility of the movement position of the sensor unit 11 and maintain the measurement accuracy of the sensor unit 11 by defining the position where the sensor unit 11 has moved.

  Further, in the dimension measuring apparatus according to the present embodiment, the sensor unit 11 and the sensor unit moving mechanism 12 are arranged within the range of the outer shape of the insertion unit 1, and the outer shape of the insertion unit 1 is provided at the insertion end of the insertion unit 1. And a tip portion 14 formed so as to be insertable inside the tube.

  According to this dimension measuring apparatus, when the dimension measuring apparatus is installed in the pipe, the insertion part 1 is inserted into the pipe. By providing the distal end part 14 at the insertion end of the insertion part 1, the distal end part 14 is provided. Accordingly, it is possible to prevent the insertion portion 1 itself or the sensor portion 11 or the sensor portion moving mechanism 12 provided in the insertion portion 1 from colliding with the inner surface of the pipe.

  In addition, the dimension measuring apparatus according to the present embodiment includes a support rod 2 in which the insertion portion 1 is disposed inside the pipe, a rotational movement mechanism 31 that rotates the support rod 2 around the axis of the pipe, and the support rod 2. And an axial movement mechanism 32 for moving the pipe along the axial direction of the pipe.

  According to this dimension measuring apparatus, the rotation of the support rod 2 around the axis of the tube by the rotational movement mechanism 31 causes the sensor unit 11 arranged in the insertion portion 1 to rotate around the axis of the tube, so that the circumference of the tube The inner shape in the direction is obtained. Moreover, since the sensor part 11 arrange | positioned at the insertion part 1 moves along the axial direction of a pipe | tube by moving the support rod 2 along the axial direction of a pipe | tube by the axial direction moving mechanism 32, in the axial direction of a pipe | tube. An inner surface shape is obtained. Then, by disposing the rotational movement mechanism 31 and the axial movement mechanism 32 outside the pipe, it is possible to measure a relatively small pipe inner diameter without arranging the mechanism inside the pipe. Become.

  Further, the dimension measuring method of the present embodiment includes an axial direction measuring step of measuring the radial dimension from a predetermined position in the pipe to the inner surface of the pipe by moving the sensor unit 11 in the axial direction of the pipe, A circumferential measuring step of measuring the radial dimension from a predetermined position in the pipe to the inner surface of the pipe by moving the sensor portion 11 in the circumferential direction, and from the respective radial dimensions obtained in each step, the inner surface of the pipe In the dimension measuring method for obtaining a shape, when the radial dimension from a predetermined position to the inner surface of the pipe deviates from the measurement range by the sensor unit 11 in the axial direction measuring step and the circumferential direction measuring step, the sensor unit 11 is moved in the radial direction of the tube. It further includes a re-measurement step of moving each step again and combining the inner shape of the tube obtained by the re-measurement step with the inner shape of the tube obtained by the axial direction measurement step and the circumferential direction measurement step. .

  According to this dimension measurement method, even if the sensitivity is small (the measurement range H is narrow) in the small sensor unit 11 that can be inserted into a relatively small diameter tube, the sensor unit 11 is moved in the radial direction of the tube. By performing the re-measurement step, it is possible to measure a sufficient range of tube inner diameter dimensions. As a result, it becomes possible to measure the inner diameter of the tube having a relatively small diameter.

DESCRIPTION OF SYMBOLS 1 Insertion part 11 Sensor part 12 Sensor part moving mechanism 121 Guide part 121a Rail member 121b Moving member 122 Drive source part 123 Link part 124 Regulation | regulation part 13 Imaging part 14 Tip part 15 Fixing part 2 Support rod 21 Ball spline groove 22 Ball screw groove 3 Support rod moving unit 31 Rotating moving mechanism 311 Outer cylinder 311a Flange 312 Inner cylinder 313 Ball spline 314 Driven gear 315 Rotation drive motor 32 Axial movement mechanism 321 Ball screw nut 322 Driven gear 323 Axial drive motor 4 Control unit 41 Storage unit 42 Calculation Part

Claims (6)

An insertion part to be inserted inside the tube;
A sensor part that is provided in the insertion part and measures a radial dimension from a predetermined position to the inner surface of the pipe in a state of being arranged inside the pipe;
A sensor part moving mechanism that is provided in the insertion part and moves the sensor part in the radial direction of the pipe;
A dimension measuring apparatus comprising:   The sensor unit moving mechanism includes a guide unit that guides the movement of the sensor unit in the radial direction of the tube, a drive source unit that reciprocates along the axial direction of the tube, and a reciprocating operation of the drive source unit. The dimension measuring device according to claim 1, further comprising a link unit that converts the moving direction of the sensor unit.   The dimension measuring apparatus according to claim 1, wherein the sensor unit moving mechanism further includes a defining unit that defines a moving position of the sensor unit.   The sensor unit and the sensor unit moving mechanism are arranged within the range of the outer shape of the insertion portion, and are formed larger at the insertion end of the insertion portion than the outer shape of the insertion portion and can be inserted into the tube. The dimension measuring apparatus according to any one of claims 1 to 3, further comprising a tip portion formed on the surface.   A rotation rod mechanism for rotating the support rod about the axis of the tube; and an axial direction for moving the support rod along the axial direction of the tube. The dimension measuring device according to any one of claims 1 to 4, wherein a moving mechanism is arranged outside the tube. An axial direction measuring step of measuring the radial dimension from a predetermined position in the pipe to the inner surface of the pipe by moving the sensor section along the axial direction of the pipe, and moving the sensor section over the circumferential direction of the pipe A circumferential measurement step of measuring a radial dimension from a predetermined position in the tube to the inner surface of the tube, and in a dimension measuring method for obtaining the inner surface shape of the tube from each radial dimension obtained by each of the steps,
When the radial dimension from the predetermined position to the inner surface of the tube deviates from the measurement range by the sensor unit in the axial direction measurement step and the circumferential direction measurement step, the sensor unit is moved in the radial direction of the tube The method further includes a re-measurement step for performing the step again, and combines the inner surface shape of the tube obtained by the re-measurement step with the inner surface shape of the tube obtained by the axial direction measurement step or the circumferential direction measurement step. A dimension measuring method characterized by the above.

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