JP5980885B2 - Outside diameter measuring device - Google Patents

Description

  The present invention relates to an outer diameter measuring device.

  For example, a boiler for power generation provided to rotate a turbine in a thermal power plant further comprises a economizer that preheats boiler feed water, a water cooling wall that forms a boiler housing and makes boiler feed water saturated steam, and further heats saturated steam. And a reheater that reheats the steam from the turbine and supplies it again to the turbine. Moreover, said superheater and reheater are comprised with the boiler tube which uses heat-resistant steel (for example, low alloy steel) as a component. However, if the boiler tube continues to be used at a high temperature exceeding the design standard, the outer surface of the boiler tube bulges or the wall thickness of the boiler tube decreases with the progress of creep damage. May occur. Therefore, in order to prevent an accident caused by the deterioration of the boiler tube, the deterioration state of the boiler tube is periodically inspected, and the trend management such as the above-described bulging and thinning is performed. For example, when inspecting a boiler tube, a scaffold is installed inside the power generation boiler, and the operator visually checks the deterioration state of the outer peripheral surface of the boiler tube while passing through the scaffold. Only the outer diameter (representative point) at any position of the diameter is measured using a caliper or gauge, and trend management such as bulging or thinning of the boiler tube is performed based on these results (for example, patent documents) 1).

JP2013-122411A

  However, when the boiler tube is inspected, a scaffold is required, which may reduce work efficiency. In addition, when visually inspecting the deterioration of the outer peripheral surface of the boiler tube, it is difficult to confirm slight changes in the bulging and thinning that occur in the boiler tube. there were. Moreover, when measuring the outer diameter of a boiler tube, since only the outer diameter of arbitrary positions is measured among the outer diameters of a boiler tube, there exists a possibility that exact tendency management cannot be performed. Furthermore, when measuring the outer diameter of the boiler tube, since the operator performs the measurement manually, the working time per boiler tube becomes longer. It becomes difficult to measure the outer diameter of all the boiler tubes arranged side by side, and there is a possibility that accurate trend management cannot be performed.

  Accordingly, an object of the present invention is to provide an outer diameter measuring device that accurately measures the outer diameter of a boiler tube in a relatively short time.

The main present invention for solving the above-mentioned problem is an outer diameter measuring device for measuring the outer diameter of a cylindrical pipe formed of alloy steel, and exceeds the outer diameter of the pipe along the longitudinal direction of the pipe. A first laser beam having a width, a light emitting device disposed adjacent to a peripheral surface of the pipe, and reflecting the first laser beam as a second laser beam along a direction of a cross section of the pipe; A first mirror device arranged so that both sides of the width of the second laser beam pass outside the pipe; and the second laser after both sides of the width of the second laser beam pass through both sides of the pipe A second mirror device that reflects light as a third laser beam along the longitudinal direction of the pipe and is arranged so that the traveling direction of the third laser beam is opposite to the traveling direction of the first laser beam And the light emitting device is adjacent so as to receive the third laser beam. A light receiving device disposed adjacent to a peripheral surface opposite to the peripheral surface of the pipe, and the light emitting device, the first The first and second mirror devices and the light receiving device are held, and are detachably mounted around the pipe, and have a plurality of guide rollers that rotate on the peripheral surface on the same side of the pipe. A guide device that guides along the pipe, a pressing rod for pressing the plurality of guide rollers against the circumferential surface of the pipe, and a center located on a longitudinal center line marked on the circumferential surface of the pipe And a holding device having a mark for confirming .

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the outer diameter measuring apparatus which measures the outer diameter of piping correctly in a comparatively short time.

It is a figure which shows the whole structure of the thermal power plant in which the outer diameter measuring apparatus which concerns on this embodiment is used. It is a perspective view which shows the outer diameter measuring apparatus which concerns on this embodiment. It is a perspective view which shows a mode that the guide line drawing apparatus was mounted | worn with the boiler tube in the preparatory stage before mounting | wearing a boiler tube with the outer diameter measuring device which concerns on this embodiment. It is a perspective view which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was mounted | worn with the boiler tube. It is a top view which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was mounted | worn with the boiler tube. It is a top view which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was mounted | worn with the boiler tube. It is a block diagram which shows the control apparatus which controls the outer diameter measuring apparatus which concerns on this embodiment.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

=== Overall configuration of thermal power plant ===
FIG. 1 is a diagram showing an overall configuration of a thermal power plant in which the outer diameter measuring apparatus according to the present embodiment is used. The overall configuration of the thermal power plant shown in FIG. 1 is an example for easily understanding the explanation of the outer diameter measuring apparatus according to the present embodiment. It is also possible to measure the outer diameter of the boiler tube in the thermal power plant having a configuration different from that of the thermal power plant of FIG. 1 using the outer diameter measuring device according to the present embodiment. However, the outer diameter measuring device according to the present embodiment needs to be designed in advance according to the outer diameter of the boiler tube installed in each thermal power plant.

  The thermal power plant 1 includes a boiler 2, a steam generator 3, a water cooling wall 4, a steam valve 5, a high pressure turbine 6, a medium pressure turbine 7, a low pressure turbine 8, a reheater 9, a condenser 10, a feed water pump 11, and a power generation The machine 12 is configured.

  The boiler 2 is a heat exchange device that mixes fuel supplied from the outside (for example, coal in the form of pulverized coal) and air to generate combustion gas, and uses the heat of the combustion gas to change water to steam. The boiler 2 contains a steam generator 3, a water cooling wall 4, and a reheater 9. The steam generator 3 includes a economizer (not shown) that preheats water supplied from the condenser 10, and a superheater (not shown) that further heats the saturated steam supplied from the water cooling wall 4 to superheated steam. ) And. The water cooling wall 4 forms the housing of the boiler 2 and supplies the preheated water as saturated steam to the superheater. The steam valve 5 is a regulating valve that controls the flow rate of superheated steam generated by the steam generator 4.

  The rotary shafts 13 of the high-pressure turbine 6, the intermediate-pressure turbine 7, and the low-pressure turbine 8 are the same and are coupled to the rotary shaft 14 of the generator 12. Superheated steam (first steam) generated by the steam generator 3 is supplied to the high-pressure turbine 6 via the steam valve 5. The high-pressure turbine 6 expands the first steam and supplies the expanded steam (second steam) to the reheater 9 in the boiler 2. The reheater 9 reheats the second steam and supplies it to the intermediate pressure turbine 7 as reheated steam (third steam). The intermediate pressure turbine 7 expands the third steam and supplies the expanded steam (fourth steam) to the low pressure turbine 8. The low pressure turbine 8 expands the fourth steam.

  The condenser 10 condenses the exhaust gas after the low-pressure turbine 8 expands the fourth steam and converts it into condensate. The feed water pump 11 boosts the condensate generated by the condenser 10 and returns it to the steam generator 3 in the boiler 2 as feed water.

  Then, the generator 12 is driven by the power generated when the fourth steam expands so that electric power is generated.

  The steam generator 4 and the reheater 9 are configured to include a boiler tube (piping) for circulating steam, and about 100 boiler tubes are substantially between the right and left cans of the housing forming the boiler 2. Are arranged at regular intervals. The outer diameter measuring device according to the present embodiment is a device for measuring the outer diameter of the boiler tube, and details thereof will be described later.

=== Configuration of Outer Diameter Measuring Device ===
FIG. 2 is a perspective view showing the outer diameter measuring apparatus according to the present embodiment. FIG. 3 is a perspective view showing a state in which the guide line drawing device is attached to the boiler tube in a preparation stage before the outer diameter measuring device according to the present embodiment is attached to the boiler tube. FIG. 4 is a perspective view showing a state where the outer diameter measuring apparatus according to the present embodiment is attached to the boiler tube. 2 to 4, the X axis indicates the direction along the alignment direction of the plurality of boiler tubes, the Y axis indicates the direction along the longitudinal direction of each of the plurality of boiler tubes, and the Z axis is formed by the X axis and the Y axis. The direction orthogonal to the XY plane is shown. FIG. 5 is a plan view showing a state in which the outer diameter measuring apparatus according to the present embodiment is attached to the boiler tube. FIG. 6 is a top view showing a state where the outer diameter measuring apparatus according to the present embodiment is attached to the boiler tube. FIG. 7 is a block diagram illustrating a control device that controls the outer diameter measuring device according to the present embodiment. The boiler tube has a cylindrical shape and is formed using a low alloy steel as heat-resistant steel.

  The outer diameter measuring device 100 includes a light emitting device 101, a first mirror device 102, a second mirror device 103, a light receiving device 104, guide rollers 105 and 106 (guide device), and a holder 107 (holding device). For convenience of explanation, the light emitting device 101 and the light receiving device 104 have the same shape (for example, a rectangular parallelepiped shape), and the first and second mirror devices 105 and 106 also have the same shape (for example, a rectangular parallelepiped shape). I will do it.

  The light emitting device 101 emits first laser light having a width L that exceeds the outer diameter of the boiler tube 108 (the diameter of a surface parallel to the XZ plane). The light emitting device 101 has a + X side of the boiler tube 108 such that the width direction of the first laser light is in the direction along the Z axis and the light emission direction of the first laser light is in the + Y direction along the longitudinal direction of the boiler tube 108. It is arrange | positioned adjacent to the surrounding surface.

  The first mirror device 102 reflects the first laser light as the second laser light. Specifically, the width direction of the second laser light remains along the Z axis and the reflection direction of the second laser light is the boiler. Reflection is performed in the −X direction along the cross section of the tube 108 (a plane parallel to the XZ plane). In the first mirror device 102, the boiler tube 108 on the + Y side from the light emitting device 101 so that the width L ′ at both ends of the width L of the second laser light passes through both sides (+ Z side and −Z side) of the boiler tube 108. Is arranged adjacent to the peripheral surface on the + X side. The first mirror device 102 has a reflecting surface on the −Y side, but is arranged in a state inclined from the state parallel to the XZ plane by 45 degrees toward the + Y side around the + X side along the Z axis.

  The second mirror device 103 reflects the second laser light as the third laser light. Specifically, the width L ′ at both ends of the width L of the second laser light passes through both sides of the boiler tube 108. Two laser beams are reflected as a third laser beam. The second mirror device 103 has the boiler tube 108 such that the width direction of the third laser light remains in the direction along the Z axis and the reflection direction of the third laser light is in the −Y direction along the longitudinal direction of the boiler tube 108. Is disposed adjacent to the peripheral surface on the −X side. The second mirror device 103 has a reflecting surface on the −Y side, but is arranged in a state inclined by 45 degrees from the state parallel to the XZ plane to the + Y side around the −X side along the Z axis.

  The light receiving device 104 is disposed adjacent to the -X side peripheral surface of the -Y side boiler tube 108 from the second mirror device so as to receive the third laser light.

  The guide rollers 105 and 106 are devices that guide the outer shape measuring device 100 mounted on the peripheral surface of the boiler tube 108 along the longitudinal direction of the boiler tube 108 while rotating on the peripheral surface of the boiler tube 108. . The guide rollers 105 and 106 are disposed so as to be adjacent to the peripheral surface on the −Z side of the boiler tube 108 along the longitudinal direction of the boiler tube 108. The guide rollers 105 and 106 have a curved surface along the peripheral surface of the boiler tube 108 such that the surface facing the peripheral surface of the boiler tube 108 has a large contact area with the peripheral surface of the boiler tube 108.

  The holder 107 includes the fixing brackets 107A, 107B, 107C, 107D, and 107E. The fixing bracket 107A includes the light-emitting device 101 and the first mirror device 102 so that the light-emitting device 101 and the first mirror device 102 are disposed adjacent to the peripheral surface on the + X side of the boiler tube 108 at a certain distance. A metal fitting that joins the gaps along the Y-axis. The fixing bracket 107B is arranged such that the second mirror device 103 and the light receiving device 104 are disposed adjacent to the peripheral surface on the −X side of the boiler tube 108 with a certain distance therebetween. It is a metal fitting which joins between along the Y-axis. The fixing bracket 107C has an X axis between the light emitting device 101 and the light receiving device 104 so that each of the first mirror device 102 and the light emitting device 101 faces the second mirror device 103 and the light receiving device 104 via the boiler tube 108. It is a metal fitting joined together. A guide roller 105 is rotatably attached to the surface of the + Z side, which is the surface facing the boiler tube 108 of the fixing bracket 107C, along the peripheral surface of the boiler tube 108. At the center in the X-axis direction of the surface on the −Z side that is the surface of the fixing bracket 107 </ b> C that does not face the boiler tube 108, a guide to be described later is provided so that the moving direction of the outer diameter measuring device 100 does not deviate from the Y-axis direction. A mark 110 (for example, a red triangle arrow) for visually observing the deviation from the line is attached. The fixing bracket 107D is a bracket that couples the light emitting device 101 and the light receiving device 104 along the X axis on the lower side (−Y side) of the fixing bracket 107C. A guide roller 106 is rotatably attached along the peripheral surface of the boiler tube 108 on the surface on the + Z side, which is the surface facing the boiler tube 108 of the fixture 107D. The fixing bracket 107E is a bracket that connects the fixing brackets 107C and 107D and the pressing rod 109 so that the pressing rod 109 presses the guide rollers 105 and 106 against the peripheral surface of the boiler tube 108. The pressing rod 109 is coupled to the fixing bracket 107E so as to freely move with the end of the pressing rod 109 on the side coupled to the fixing bracket 107E as a fulcrum.

  As the light emitting device 101 and the light receiving device 104, for example, a light emitting side unit and a light receiving side unit constituting the LS-9000, which is a dimension measuring device manufactured by Keyence Corporation, can be adopted.

=== Configuration of Guide Line Drawing Device ===
When measuring the outer diameter of the boiler tube, the operator attaches the outer diameter measuring device 100 to the boiler tube 108, operates the pushing rod 109, and presses the guide rollers 105, 106 against the peripheral surface of the boiler tube 108. However, the outer diameter measuring device 100 is moved along the longitudinal direction of the boiler tube 108. Since the distance between the light emitting device 101 and the light receiving device 104 sandwiching the boiler tube 108 is set to a distance slightly exceeding the outer diameter of the boiler tube 108, the outer diameter measuring device 100 extends along the longitudinal direction of the boiler tube 108. When it moves, it will shift | deviate from the direction along a Y-axis, and there exists a possibility that the change of the outer diameter of the boiler tube 108 cannot be measured correctly. In order to solve this problem, it is desirable to provide a mark that can visually discriminate that the outer diameter measuring device 100 has shifted from the direction along the Y axis.

  In the preparatory stage before the outer diameter measuring device 100 is attached to the measurement target boiler tube 108, the guide line drawing device 200 places the outer diameter measuring device 100 on the peripheral surface of the measurement target boiler tube 108. 108 depicts a guide line 206 for guiding along the longitudinal direction of 108. The guide line 206 is a straight line drawn along the Y-axis at the center in the X-axis direction on the −Z side peripheral surface of the boiler tube 108.

  The guide line drawing device 200 is configured to include guide members 201 to 204 that move along the longitudinal direction (+ Y direction, −Y direction) of the boiler tube 108. The guide members 201 and 202 have an arc shape along the peripheral surface of the boiler tube 108 as viewed from the Y-axis direction. The guide members 203 and 204 each have a flat plate shape whose distance in the direction along the X axis is longer than the distance between the adjacent boiler tubes 108. In the Y-axis direction, the guide members 201 and 202 are coupled with the guide member 203 on the −X side and the guide member 204 on the + X side. The guide members 203 and 204 are coupled at a predetermined distance along the X axis so that an opening 205 for describing the guide line 206 is formed. The opening 205 is provided at the center in the X-axis direction on the −Z side peripheral surface of the boiler tube 108 to be measured. A writing instrument (not shown) for drawing a guide line is attached to the opening 205. Since the boiler tube 108 has the same outer diameter and is aligned along the X axis, when the guide members 201 and 202 come into contact with the peripheral surface of the boiler tube 108 to be measured, the guide member 203 is measured. The guide member 204 comes into contact with the peripheral surface of the + X side boiler tube 108 adjacent to the measurement target boiler tube 108, and comes into contact with the peripheral surface of the −X side boiler tube 108 adjacent to the boiler tube 108. Therefore, the guide line drawing device 200 on which the writing instrument is mounted is moved along the Y axis while being pressed against the peripheral surfaces of the three boiler tubes 108, thereby guiding the guide line to the peripheral surface of the boiler tube 108 to be measured at the center. Line 206 is depicted.

=== Configuration of Control Device ===
The control device 300 is a device that calculates the outer diameter of the boiler tube 108 by calculation based on the light reception result of the light receiving device 104.

  The control device 300 includes input units 301 and 302, a storage unit 303, a calculation unit 304, and an output unit 305. The function of the control device 300 is executed by a microcomputer having a ROM, a RAM, and a CPU executing a program. The control device 300 is attached, for example, at a predetermined position of the holder 107 so that an instruction signal from the operator and a light reception result of the light receiving device 104 are input.

  The input unit 301 is an interface between the operator and the control device 300 to which an instruction signal for instructing the start of measurement of the outer diameter of the boiler tube 108 is input. The input unit 301 is an interface between the light receiving device 104 and the control device 300 to which the light reception result of the light receiving device 104 is input.

  The storage unit 303 stores program data for measuring the outer diameter of the boiler tube 108 in advance, and stores information indicating the outer diameter of the boiler tube 108 calculated based on the light reception result of the light receiving device 104.

  The calculation unit 304 calculates the outer diameter of the boiler tube 108 based on the light reception result of the light receiving device 104 and stores it in the storage unit 303 as a measurement result of the outer diameter of the boiler tube 108. Note that the arithmetic unit 304 may continuously calculate the outer diameter of the boiler tube 108 when the outer diameter measuring device 100 is moving along the longitudinal direction of the boiler tube 108, or the outer diameter measuring device 100. When the operation is stopped, the outer diameter of the boiler tube 108 may be calculated.

  When the light emitting device 101 emits the first laser beam having the width L along the Y axis, a part of the width L of the second laser beam reflected by the first mirror device 102 is blocked by the boiler tube 108. The device 104 receives the width 2L ′ of the third laser beam reflected by the second mirror device 103. A light reception result of the light receiving device 104 is input to the input unit 302. The calculation unit 304 calculates L−2L ′ based on the light reception result of the light receiving device 104 and stores it in the storage unit 303 as a measurement result of the outer diameter of the boiler tube 108. When the boiler tube 108 bulges or thins due to creep damage, L ′ changes, so that the change in the outer diameter of the boiler tube 108 can be reliably grasped.

  The output unit 305 outputs information related to the outer diameter of the boiler tube 108 stored in the storage unit 303 to, for example, a management terminal installed in a control room in the thermal power plant via a communication line.

=== Measurement Operation of Outer Diameter Measuring Device ===
First, the operator attaches the guide line drawing device 200 to the boiler tube 108, and the boiler tube to be measured so that the moving direction of the outer diameter measuring device 100 does not deviate from the Y-axis direction that is the longitudinal direction of the boiler tube 108. A guide line 206 as an index is depicted on the peripheral surface 108.

  Next, the operator attaches the outer diameter measuring device 100 to the boiler tube 108 to be measured so that the mark 110 is positioned on the guide line 206.

  Next, the operator inputs an instruction signal for starting measurement of the outer diameter of the boiler tube 108 to the input unit 301. Further, the operator operates the pressing rod 109 and presses the boiler tube 108 on the Y axis while pressing the guide rollers 105 and 106 against the peripheral surface of the boiler tube 108 so that the mark 110 does not deviate from the guide line 206. Move along. When the instruction signal is input to the input unit 301, the light emitting device 101 starts to emit the first laser light, and the light receiving device 104 starts to receive the third laser light. The light reception result of the light receiving device 104 is input to the input unit 302. The calculation unit 304 calculates the outer diameter of the boiler tube 108 based on the light reception result of the light receiving device 104 and stores it in the storage unit 303.

  Next, the output unit 305 receives information related to the outer diameter of the boiler tube 108 stored in the storage unit 303, for example, in response to a request from a management terminal installed in a control room in a thermal power plant. Output to.

  As described above, the outer diameter measuring device 100 measures the outer diameter of the cylindrical boiler tube 108 formed of low alloy steel, and the boiler tube extends along the longitudinal direction (Y-axis direction) of the boiler tube 108. The first laser beam having a width L exceeding the outer diameter of 108 is emitted, the light emitting device 101 disposed adjacent to the peripheral surface of the boiler tube 108, and the first laser beam on the cross section (XZ plane) of the boiler tube 108. The first laser beam is reflected along the direction as the second laser beam, and the width L ′ on both sides of the width L of the second laser beam is arranged so as to pass the outside (+ Z direction, −Z direction) of the boiler tube 108. The first laser device 102 and the second laser light after the widths L ′ on both sides of the width L of the second laser light pass through both sides of the boiler tube 108 are converted into third laser light along the longitudinal direction of the boiler tube 108. age The second mirror device 103 arranged to reflect and the light emitting device 101 are arranged adjacent to the peripheral surface opposite to the peripheral surface of the adjacent boiler tube 108 so as to receive the third laser light. The light emitting device 101, the first and second mirror devices 102 and 103, and the light receiving device 104 are held and the boiler so that the outer diameter of the boiler tube 108 can be measured based on the light receiving device 104 and the light reception result of the light receiving device 104. And a holder 107 that is detachably mounted around the tube 108.

  According to this embodiment, since the change in the width of the laser beam received by the light receiving device 104 is taken into account when measuring the outer diameter of the boiler tube 108, the time for measuring the outer diameter of the boiler tube 108 is shortened. It becomes possible to perform accurate trend management. Further, the direction in which the light emitting device 101 emits the first laser light and the direction in which the light receiving device 104 receives the third laser light are directions along the longitudinal direction of the boiler tube 108, and therefore, between the adjacent boiler tubes 108. It is possible to reliably measure the outer diameter of the boiler tube 108 even for specifications with a short distance.

  The second mirror device 103 is arranged so that the traveling direction of the third laser light is opposite to the traveling direction of the first laser light.

  According to the present embodiment, the outer diameter measuring device 100 can be reduced in size, and the outer diameter measuring device 100 having good operability can be provided.

  The holder 107 has guide rollers 105 and 106 that rotate on the peripheral surface of the boiler tube 108 as a guide device that guides the holder 107 along the longitudinal direction of the boiler tube 108.

  According to this embodiment, the outer diameter of the boiler tube 108 can be measured continuously and over a wide range. In addition, by continuously measuring the outer diameter of the boiler tube 108 over a wide range, it is possible to grasp the tendency of the entire boiler tube 108 to bulge or thin. In addition, it is possible to diagnose the remaining life of the boiler tube 108 by grasping the tendency of swelling and thinning of the entire boiler tube 108. In addition, by diagnosing the remaining life of the boiler tube 108, it is possible to replace the boiler tube 108 at an optimal time without waste without replacing the boiler tube 108 with time management, leading to cost reduction. . In addition, when the boiler tube 108 has a tube leak before the boiler tube 108 is replaced by time management, the boiler tube 108 can be replaced in advance by diagnosing the remaining life of the boiler tube 108. .

  Further, the guide rollers 105 and 106 have a curved surface shape that contacts the peripheral surface of the boiler tube 108 when rotating on the peripheral surface of the boiler tube 108.

  According to this embodiment, since the contact area of the guide rollers 105 and 106 with respect to the peripheral surface of the boiler tube 108 is increased, the outer diameter measuring device 100 can be reliably moved along the longitudinal direction of the boiler tube 108. Become.

  The guide rollers 105 and 106 rotate on the same peripheral surface of the boiler tube 108, and the holder 107 has a pressing rod 109 for pressing the guide rollers 105 and 106 against the peripheral surface of the boiler tube 108. doing.

  According to this embodiment, since the guide rollers 105 and 106 are pressed against the peripheral surface of the boiler tube 108, the outer diameter measuring device 100 can be reliably moved along the longitudinal direction of the boiler tube 108.

  Further, the holder 107 has a mark 110 for confirming that the center of the holder 107 is positioned on the longitudinal guide line 206 marked on the peripheral surface of the boiler tube 108.

  According to the present embodiment, since the moving direction of the outer diameter measuring device 100 is not shifted from the longitudinal direction of the boiler tube 108, the outer diameter measuring device 100 can be reliably moved along the longitudinal direction of the boiler tube 108. Become.

  In addition, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof. The piping to be measured by the outer diameter measuring apparatus 100 includes not only the boiler tube 108 but also a cylindrical pipe whose outer diameter changes due to external factors.

DESCRIPTION OF SYMBOLS 100 Outer diameter drive device 101 Light-emitting device 102 1st mirror device 103 2nd mirror device 104 Light-receiving device 105,106 Guide roller 107 Holder 107A-107E Fixing metal fitting 108 Boiler tube 109 Pushing rod 110 Mark 200 Guide line drawing device 201-204 Guide member 205 Opening 300 Control device

Claims (2)

An outer diameter measuring device for measuring the outer diameter of a cylindrical pipe formed of alloy steel,
A first laser beam having a width exceeding the outer diameter of the pipe along the longitudinal direction of the pipe, and a light emitting device disposed adjacent to the peripheral surface of the pipe;
A first mirror device that reflects the first laser light as a second laser light along a cross-sectional direction of the pipe, and is arranged so that both sides of the width of the second laser light pass outside the pipe; ,
The second laser light after both sides of the width of the second laser light pass through both sides of the pipe is reflected as a third laser light along the longitudinal direction of the pipe, and the traveling direction of the third laser light is A second mirror device disposed so as to be in a direction opposite to a direction in which the first laser beam travels ;
A light receiving device disposed adjacent to a peripheral surface opposite to the peripheral surface of the pipe adjacent to the light emitting device so as to receive the third laser light;
The light emitting device, the first and second mirror devices, and the light receiving device are held and detachably mounted around the pipe so that the outer diameter of the pipe can be measured based on the light reception result of the light receiving device. A guide device having a plurality of guide rollers rotating on a peripheral surface on the same side of the pipe and guiding along the longitudinal direction of the pipe; and for pressing the plurality of guide rollers against the peripheral surface of the pipe A holding device having a pressing rod and a mark for confirming that the center is located on a center line in a longitudinal direction marked on the peripheral surface of the pipe ,
An outer diameter measuring device comprising: The outer diameter measuring device according to claim 1 , wherein the guide roller has a shape in contact with the peripheral surface of the pipe when rotating on the peripheral surface of the pipe.

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