JP5973532B2 - 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 that solves the above-described problem is an outer diameter measuring device that measures the outer diameter of a cylindrical pipe formed of alloy steel, and is a first along the first direction of the first cross section of the pipe. A first light emitting device that emits a first laser beam having a width, and a portion of the first width of the first laser beam passes outside the pipe; and a first width of the first laser beam. A first light-receiving device arranged to receive a part of the first light-emitting device, and a second laser beam having a second width emitted along the first direction of the first cross section of the pipe, A second light emitting device arranged so that a part of the second width of the second laser light passes through an outer side opposite to the outer side of the pipe through which a part of the first width passes; and the second laser a second light receiving device arranged to receive a portion of the second width of the light, before the second cross-section different from the first cross-section of the pipe A third laser beam having a third width is emitted along a second direction different from the first direction, and a part of the third width of the third laser beam is disposed so as to pass outside the pipe. A third light-receiving device, a third light-receiving device arranged to receive a part of the third width of the third laser light, and a fourth width along the second direction of the second cross section of the pipe A part of the fourth width of the fourth laser light passes through an outer side opposite to the outer side of the pipe that emits the fourth laser light and passes a part of the third width of the third laser light. A fourth light emitting device disposed on the first light receiving device, a fourth light receiving device disposed so as to receive a part of a fourth width of the fourth laser light, and light reception results of the first to fourth light receiving devices. The first light emitting device, the first light receiving device, the third light emitting device, and the third light receiving device so that the outer diameter of the pipe can be measured. On the other hand, a first holder that holds one of the fourth light-emitting device and the fourth light-receiving device and surrounds one half surface of the pipe, the second light-emitting device, the second light-receiving device, and the third light-emitting device And the other of the third light-receiving device, the other of the fourth light-emitting device and the fourth light-receiving device, surrounding the other half-circumferential surface of the pipe, and being coupled or separated from the first holder. A holding device that is detachably mounted around the pipe, and a first guide device that is held by the first holder and guides the holding device along the longitudinal direction of the pipe, A second guide device that is held by the second holder and guides the holding device along a longitudinal direction of the pipe .

  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 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 sectional drawing which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was cut | disconnected by the surface parallel to XY plane. It is sectional drawing which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was cut | disconnected by the surface parallel to XZ plane in A position on a Y-axis. It is sectional drawing which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was cut | disconnected by the surface parallel to XZ plane in B position on a Y-axis. It is sectional drawing which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was cut | disconnected by the surface parallel to XZ plane in C position on a Y-axis. It is sectional drawing which shows a mode that the outer diameter measuring apparatus which concerns on this embodiment was cut | disconnected by the surface parallel to XZ plane in D position on a Y-axis. It is a top view which shows a mode that the holder which comprises the outer diameter measuring apparatus which concerns on this embodiment opened. It is a perspective view which shows a mode that the holder which comprises the outer diameter measuring apparatus which concerns on this embodiment opened. 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 a state where the outer diameter measuring apparatus according to the present embodiment is attached to the boiler tube. In FIG. 2, the X axis indicates the direction along the arrangement direction of the plurality of boiler tubes, the Y axis indicates the direction along the longitudinal direction of the plurality of boiler tubes, and the Z axis is an XY plane formed by the X axis and the Y axis. The direction orthogonal to is shown. FIG. 3 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. 4 is a cross-sectional view showing a state in which the outer diameter measuring apparatus according to the present embodiment is cut along a plane parallel to the XY plane. FIG. 5 is a cross-sectional view showing a state in which the outer diameter measuring apparatus according to the present embodiment is cut along a plane parallel to the XZ plane at position A on the Y axis. FIG. 6 is a cross-sectional view showing a state in which the outer diameter measuring apparatus according to the present embodiment is cut along a plane parallel to the XZ plane at the B position on the Y axis. FIG. 7 is a cross-sectional view showing a state in which the outer diameter measuring apparatus according to the present embodiment is cut along a plane parallel to the XZ plane at the C position on the Y axis. FIG. 8 is a cross-sectional view showing a state in which the outer diameter measuring apparatus according to the present embodiment is cut along a plane parallel to the XZ plane at the D position on the Y axis. FIG. 9 is a plan view showing an open state of a holder constituting the outer diameter measuring apparatus according to the present embodiment. FIG. 10 is a perspective view showing a state in which a holder constituting the outer diameter measuring apparatus according to the present embodiment is opened. FIG. 11 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 apparatus 100 includes a first light emitting device 101, a first light receiving device 102, a second light emitting device 103, a second light receiving device 104, a third light emitting device 105, a third light receiving device 106, a fourth light emitting device 107, 4 light receiving device 108, guide rollers 109 to 116 (guide device), and holder 117 (holding device). For convenience of explanation, the first to fourth light emitting devices 101, 103, 105, and 107 and the first to fourth light receiving devices 102, 104, 106, and 108 have the same shape, for example, a rectangular parallelepiped shape. Suppose that

  The first light emitting device 101 emits a first laser beam having a width L1 shorter than the radius of the cross section of the boiler tube 118 (a plane parallel to the XZ plane). The first light emitting device 101 is attached to the holder 117 such that the width direction of the first laser light is along the X axis and the light emission direction of the first laser light is in the −Z direction. The apparatus 101 is attached to the holder 117 so that a width L1 ′, which is a part of the width L1 of the first laser light, passes outside the −X side of the boiler tube 118. The first light receiving device 102 receives the width L1 'of the first laser beam. The first light receiving device 102 is attached to the holder 117 along the Z axis so as to face the first light emitting device 101. That is, the positions of both sides along the Z axis of the first light emitting device 101 and the first light receiving device 102 coincide with each other.

  The second light emitting device 103 emits a second laser beam having a width L2 (= L1) shorter than the radius of the cross section of the boiler tube 118. The second light emitting device 103 is attached to the holder 117 such that the width direction of the second laser light is along the X axis and the light emission direction of the second laser light is in the −Z direction. The apparatus 103 is attached to the holder 117 so that a width L2 ′ (= L1 ′), which is a part of the width L2 of the second laser light, passes outside the boiler tube 118 on the + X side. The second light receiving device 104 receives the width L2 'of the second laser light. The second light receiving device 104 is attached to the holder 117 along the Z axis so as to face the second light emitting device 103. That is, the positions of both sides of the second light emitting device 103 and the second light receiving device 104 along the Z-axis coincide with each other. In addition, the positions of both sides of the first light emitting device 101 and the second light emitting device 103 along the X axis coincide with each other. In addition, the positions of both sides along the X axis of the first light receiving device 102 and the second light receiving device 104 coincide with each other. The first light emitting device 101, the first light receiving device 102, the second light emitting device 103, and the second light receiving device 104 are attached on the same XZ plane S 1 of the holder 117.

  The third light emitting device 105 emits a third laser beam having a width L3 (= L1) shorter than the radius of the cross section of the boiler tube 118. The third light emitting device 105 is attached to the holder 117 such that the width direction of the third laser light is along the Z axis and the light emission direction of the third laser light is in the −X direction. The apparatus 105 is attached to the holder 117 so that a width L3 ′ (= L1 ′), which is a part of the width L3 of the third laser light, passes outside the boiler tube 118 on the + Z side. The third light receiving device 106 receives the width L3 'of the third laser light. The third light receiving device 106 is attached to the holder 117 along the X axis so as to face the third light emitting device 105. That is, the positions of both sides along the X-axis of the third light emitting device 105 and the third light receiving device 106 coincide with each other.

  The fourth light emitting device 107 emits a fourth laser beam having a width L4 (= L1) shorter than the radius of the cross section of the boiler tube 118. The fourth light emitting device 106 is attached to the holder 117 so that the width direction of the fourth laser light is along the Z axis and the emission direction of the fourth laser light is in the −X direction. The device 107 is attached to the holder 117 such that a width L4 ′ (= L1 ′), which is a part of the width L4 of the fourth laser beam, passes outside the −Z side of the boiler tube 118. The fourth light receiving device 108 receives the width L4 'of the fourth laser light. The fourth light receiving device 108 is attached to the holder 117 along the X axis so as to face the fourth light emitting device 107. That is, the positions of both sides of the fourth light emitting device 107 and the fourth light receiving device 108 along the X axis are the same. In addition, the positions of both sides of the third light emitting device 105 and the fourth light emitting device 107 along the Z axis coincide with each other. Further, the positions of both sides of the third light receiving device 106 and the fourth light receiving device 108 along the Z-axis coincide with each other. Further, the third light emitting device 105, the third light receiving device 106, the fourth light emitting device 107, and the fourth light receiving device 108 are attached on the XZ plane S2 different from the XZ plane S1 of the holder 117. Further, the light emission directions of the first and second light emitting devices 101 and 103 and the light emission directions of the third and fourth light emitting devices 105 and 107 are different from each other by 90 degrees, for example.

  The guide rollers 109 to 112 are devices that guide the outer shape measuring device 100 mounted on the peripheral surface of the boiler tube 118 along the longitudinal direction of the boiler tube 118 while rotating on the peripheral surface of the boiler tube 118. . The guide rollers 109 to 112 are mounted on the XZ plane S3 above (+ Y side) the XZ plane S1 of the holder 117. The guide rollers 109 to 112 are arranged at intervals of, for example, 90 degrees with respect to the peripheral surface of the boiler tube 118, and press the peripheral surface of the boiler tube 118 with a constant force using the elastic biasing force of an elastic member (for example, a spring). To do. The guide rollers 109 to 112 have a shape in which a surface facing the peripheral surface of the boiler tube 118 is along the peripheral surface of the boiler tube 118 so that a contact area with the peripheral surface of the boiler tube 118 is increased. As shown in FIG. 5, the cross sections of the guide rollers 109 to 112 facing the peripheral surface of the boiler tube 118 have an arc shape that substantially contacts the peripheral surface of the boiler tube 118.

  The guide rollers 113 to 116 are devices that guide the outer shape measuring device 100 mounted on the peripheral surface of the boiler tube 118 along the longitudinal direction of the boiler tube 118 while rotating on the peripheral surface of the boiler tube 118. . The guide rollers 113 to 116 are attached on the XZ plane S4 below (−Y side) the XZ plane S2 of the holder 117. The guide rollers 113 to 116 are arranged, for example, at intervals of 90 degrees with respect to the peripheral surface of the boiler tube 118, and press the peripheral surface of the boiler tube 118 with a constant force using the elastic biasing force of an elastic member (for example, a spring). To do. The guide rollers 113 to 116 are shaped so that the surface facing the peripheral surface of the boiler tube 118 is along the peripheral surface of the boiler tube 118 so that the contact area with the peripheral surface of the boiler tube 118 is large. As shown in FIG. 8, the cross sections of the guide rollers 113 to 116 facing the peripheral surface of the boiler tube 118 have an arc shape that substantially contacts the peripheral surface of the boiler tube 118.

  The holder 117 includes holder portions 117A and 117B, a support shaft 117C, and a fixing bracket 117D. The outer shape of the holder 117 is, for example, an E position and an F position on the Y axis to which the first to fourth light emitting devices 101, 103, 105, 107 and the first to fourth light receiving devices 102, 104, 106, 108 are attached. In between, it has a cylindrical shape, and on the upper side (+ Y side) of the E position on the Y axis to which the guide rollers 109 to 112 are attached, it has a conical shape whose diameter decreases toward the upper side, and the guide rollers 113 to 116 are attached. On the lower side (−Y side) from the F position on the shaft, a conical shape having a diameter that decreases toward the lower side is exhibited.

  117 A of holder parts are exhibiting the shape divided in half along the YZ plane so that the semicircular surface of the boiler tube 118 at the -X side may be covered. 117A of holder parts have the two-stage shelf 117E, 117F which protrudes from the inner wall facing the boiler tube 118. As shown in FIG. The first light emitting device 101 and the first light receiving device 102 are attached to the upper (+ Y side) shelf 117E, and the third light receiving device 106 and the fourth light receiving device 108 are attached to the lower (−Y side) shelf 117F. ing. Moreover, the holder part 117 </ b> B has a shape that is divided in half along the YZ plane so as to cover the + X side half circumferential surface of the boiler tube 118. The holder part 117B has two-stage shelves 117G and 117H protruding from the inner wall facing the boiler tube 118. The second light emitting device 103 and the second light receiving device 104 are attached to the upper (+ Y side) shelf 117G, and the third light emitting device 105 and the fourth light emitting device 107 are attached to the lower (−Y side) shelf 117H. ing. The shelves 117E and 117G are formed on the XZ plane S1, and the shelves 117F and 117H are formed on the XZ plane S2. The holder portions 117A and 117B rotate around the support shaft 117C. When the holder portion 117A rotates in the A2 direction and the holder portion 117B rotates in the B2 direction, the holder 117 opens. On the other hand, when the holder portion 117A rotates in the A1 direction and the holder portion 117B rotates in the B1 direction, the holder 117 is closed. When the holder 117 is closed, the ends of the holder portions 117A and 117B opposite to the support shaft 117C are fixed by the fixing bracket 117D so that the holder 117 is not opened.

  Note that when the operator applies a certain force along the longitudinal direction of the boiler tube 118 while holding the outer shape measuring device 100 attached around the boiler tube 118, the outer shape measuring device 100 is moved to the boiler tube 118. The elastic forces of the guide rollers 109 to 116 that press the peripheral surface of the boiler tube 118 are set in advance so as to move along the longitudinal direction.

=== Configuration of Control Device ===
The control device 200 is a device that calculates the outer diameter of the boiler tube 118 by calculation based on the light reception results of the first to fourth light receiving devices 102, 104, 106, and 108.

  The control device 200 includes input units 201 and 202, a storage unit 203, a calculation unit 204, and an output unit 205. The function of the control device 200 is executed when a microcomputer having a ROM, a RAM, and a CPU executes a program. The control device 200 is attached to a predetermined position inside the holder 117 so that the instruction signal from the operator and the light reception results of the first to fourth light receiving devices 102, 104, 106, and 108 are input.

  The input unit 201 is an interface between the operator and the control device 200 to which an instruction signal for instructing start of measurement of the outer diameter of the boiler tube 118 is input. The input unit 201 is an interface between the control device 200 and the first to fourth light receiving devices 102, 104, 106, 108 to which the light reception results of the first to fourth light receiving devices 102, 104, 106, 108 are input. is there.

  Program data for measuring the outer diameter of the boiler tube 118 is stored in the storage unit 203 in advance, and the boiler tube 118 is calculated based on the light reception results of the first to fourth light receiving devices 102, 104, 106, and 108. Information indicating the outer diameter of the is stored.

  The calculation unit 204 calculates the outer diameter of the boiler tube 118 based on the light reception results of the first to fourth light receiving devices 102, 104, 106, and 108, and stores the storage unit 203 as the measurement result of the outer diameter of the boiler tube 118. To remember. Note that the arithmetic unit 204 may continuously calculate the outer diameter of the boiler tube 118 when the outer diameter measuring device 100 is moving along the longitudinal direction of the boiler tube 118, or the outer diameter measuring device 100. When the operation is stopped, the outer diameter of the boiler tube 118 may be calculated.

  Between the first light-emitting device 101 and the second light-emitting device 103, between the first light-receiving device 102 and the second light-receiving device 104, between the third light-emitting device 105 and the fourth light-emitting device 107, and the third light-receiving device 106. And the fourth light receiving device 108 are separated from each other by a distance L5. When the first light emitting device 101 emits the first laser light having the width L1 along the Z axis, a part of the width L1 of the first laser light is blocked by the boiler tube 118, and therefore the first light receiving device 102 is the first light receiving device 102. The width L1 ′ of the laser beam is received. When the second light emitting device 103 emits the second laser light having the width L2 along the Z-axis, a part of the width L2 of the second laser light is blocked by the boiler tube 118, so the second light receiving device 104 is the second light receiving device 104. The laser beam width L2 ′ is received. The input unit 202 receives light reception results of the first and second light receiving devices 102 and 104. The calculation unit 204 calculates (L1−L1 ′) + (L2−L2 ′) + L5 based on the light reception results of the first and second light receiving devices 102 and 104, and obtains the measurement result of the outer diameter of the boiler tube 118. Store in the storage unit 203. Similarly, when the third light emitting device 105 emits the third laser light having the width L3 along the X axis, a part of the width L3 of the third laser light is blocked by the boiler tube 118. Receives the width L3 ′ of the third laser beam. When the fourth light emitting device 107 emits the fourth laser light having the width L4 along the X axis, a part of the width L4 of the fourth laser light is blocked by the boiler tube 118, so the fourth light receiving device 108 is the fourth light receiving device 108. The width L4 ′ of the laser beam is received. The input unit 202 receives light reception results of the third and fourth light receiving devices 106 and 108. The calculation unit 204 calculates (L3−L3 ′) + (L4−L4 ′) + L5 based on the light reception results of the third and fourth light receiving devices 106 and 108, and obtains the measurement result of the outer diameter of the boiler tube 118. Store in the storage unit 203. When the boiler tube 118 bulges or thins due to creep damage, L1 ′, L2 ′, L3 ′, and L4 ′ change, so it is possible to reliably grasp the change in the outer diameter of the boiler tube 118. become.

  The output unit 205 outputs information related to the outer diameter of the boiler tube 118 stored in the storage unit 203 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 opens the holder 117, arranges the holder 117 so as to surround the boiler tube 118, closes the holder 117, and fixes the end portions of the holder portions 117A and 117B with the fixing bracket 117D. Thereby, the outer diameter measuring device 100 can move along the longitudinal direction of the boiler tube 118.

  Next, the operator inputs an instruction signal for starting measurement of the outer diameter of the boiler tube 118 to the input unit 201. When the instruction signal is input to the input unit 201, the first to fourth light emitting devices 101, 103, 105, and 107 start emitting the first to fourth laser beams, respectively, and the first to fourth light receiving devices 102, Reference numerals 104, 106, and 108 start to receive the first to fourth laser beams, respectively. The light reception results of the first to fourth light receiving devices 102, 104, 106, 108 are input to the input unit 202. The arithmetic unit 204 calculates the outer diameter of the boiler tube 118 based on the light reception results of the first to fourth light receiving devices 102, 104, 106, and 108 and stores the outer diameter in the storage unit 203.

  Next, the output unit 205 stores information related to the outer diameter of the boiler tube 118 stored in the storage unit 203, 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 118 formed of low alloy steel, and the width L1 along the Z-axis on the XZ plane S1 of the boiler tube 118. A first light emitting device 101 that is arranged so that a width L1 ′ that is a part of the width L1 of the first laser light passes through the outside (−X side) of the boiler tube 118; The first light receiving device 102 arranged so as to receive the width L1 ′ of the first laser light, and the second laser light having the width L2 along the Z axis on the XZ plane of the boiler tube 118 are emitted. The second light emitting device 103 arranged so that the width L2 ′, which is a part of the light width L2, passes through the outside (+ X side) opposite to the boiler tube 118, and the width L2 ′ of the second laser light are received. A second light receiving device 104 arranged so as to The first and second light-emitting devices 101 and 103, the first and second light-receiving devices 102 and 104, and the outer diameter of the boiler tube 118 can be measured based on the light reception results of the first and second light-receiving devices 102 and 104. And a holder 117 that is detachably mounted around the boiler tube 118.

  According to this embodiment, since the change in the width of the laser beam received by the first and second light receiving devices 102 and 104 is taken into account when measuring the outer diameter of the boiler tube 118, the outside of the boiler tube 118 is The time for measuring the diameter can be shortened, and efficient trend management can be performed.

  Further, the third laser beam having the width L3 is emitted along the X axis on the XZ plane S2 of the boiler tube 118, and the width L3 ′ which is a part of the width L3 of the third laser beam is outside the boiler tube 118 (+ Z The third light-emitting device 105 disposed so as to pass through, the third light-receiving device 106 disposed so as to receive the width L3 ′ of the third laser beam, and the XZ plane S2 of the boiler tube 118 on the XZ plane S2. A fourth laser beam having a width L4 is emitted along the axis, and the width L4 ′, which is a part of the width L4 of the fourth laser beam, is disposed so as to pass the outside (−Z side) opposite to the boiler tube 118. The fourth light emitting device 107 and the fourth light receiving device 108 arranged to receive the width L2 ′ of the fourth laser beam, and the holder 117 includes the first to fourth light receiving devices 102, 104, Based on the light reception results of 106 and 108, the boiler The first to fourth light emitting devices 101, 103, 105, 107 and the first to fourth light receiving devices 102, 104, 106, 108 are held and the boiler tube 118 so that the outer diameter of the tube 118 can be measured. It is detachably mounted around.

  According to this embodiment, since the outer diameters of two different locations of the boiler tube 118 are simultaneously measured, the time for measuring the outer diameter of the boiler tube 118 can be further shortened, and accurate trend management can be performed. Is possible.

  Further, the widths L1, L2, L3, and L4 are widths equal to or less than the radius of the cross section of the boiler tube.

  According to the present embodiment, the outer diameter measuring device 100 can be reduced in size.

  Further, the holder 117 surrounds one half circumferential surface (−X side) of the boiler tube 118 and the other half circumferential surface (+ X side) of the boiler tube 118 and is coupled to or separated from the holder portion 117A. The holder unit 117A includes a first light emitting device 101, a first light receiving device 102, one of the third light emitting device 105 and the third light receiving device 106, and a fourth light emitting device. 107 and one of the fourth light receiving devices 108 are held, and in the holder portion 117B, the second light emitting device 103, the second light receiving device 104, the other of the third light emitting device 105 and the third light receiving device 106, The other of the fourth light emitting device 107 and the fourth light receiving device 108 is held.

  According to this embodiment, the outer diameter measuring device 100 can be easily attached to the boiler tube 118.

  In addition, the holder 117 is a guide device that guides the holder 117 along the longitudinal direction of the boiler tube 118, and is elastically biased in the direction of the peripheral surface of the boiler tube 118 and rotates on the peripheral surface of the boiler tube 118. Guide rollers 109 to 116 are provided.

  According to this embodiment, it becomes possible to measure the outer diameter of the boiler tube 118 continuously and over a wide range. Further, by continuously measuring the outer diameter of the boiler tube 118 over a wide range, it is possible to grasp the tendency of the entire boiler tube 118 to bulge or thin. In addition, the remaining life of the boiler tube 118 can be diagnosed by grasping the tendency of the entire boiler tube 118 to bulge or thin. Further, by diagnosing the remaining life of the boiler tube 118, it is possible to replace the boiler tube 118 at an optimal time without waste without replacing the boiler tube 118 by time management, leading to cost reduction. . Moreover, when the boiler tube 118 has produced the tube leak before replacing | exchanging the boiler tube 118 by time management, it becomes possible to replace | exchange boiler tube 118 in advance by diagnosing the remaining life of boiler tube 118. .

  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.

  For example, the outer diameter measuring apparatus 100 may include a motor inside the holder 117 and move along the longitudinal direction of the boiler tube 118 by the driving force of the motor. Further, the measurement target piping of the outer diameter measuring device 100 includes not only the boiler tube 118 but also any cylindrical piping whose outer diameter changes due to external factors.

100 outer diameter driving device 101 first light emitting device 102 first light receiving device 103 second light emitting device 104 second light receiving device 105 third light emitting device 106 third light receiving device 107 fourth light emitting device 108 fourth light receiving devices 109 to 116 guide rollers 117 Holder 117A, 117B Holder 117C Support shaft 117D Fixing bracket 117E, 117F, 117G, 117H Shelf 118 Boiler tube 200 Control device

Claims (4)

An outer diameter measuring device for measuring the outer diameter of a cylindrical pipe formed of alloy steel,
The first laser beam having the first width is emitted along the first direction of the first cross section of the pipe, and a part of the first width of the first laser beam is disposed so as to pass outside the pipe. A first light emitting device;
A first light receiving device arranged to receive a part of the first width of the first laser light;
A second laser beam having a second width is emitted along the first direction of the first cross section of the pipe, and a side opposite to the outside of the pipe through which a part of the first width of the first laser beam passes. A second light emitting device arranged so that a part of the second width of the second laser beam passes through the outside of the second laser beam;
A second light receiving device arranged to receive a part of the second width of the second laser light;
A third laser beam having a third width is emitted along a second direction different from the first direction of the second cross section different from the first cross section of the pipe, and one of the third widths of the third laser light is emitted. A third light emitting device disposed so that the portion passes outside the pipe;
A third light receiving device arranged to receive a part of the third width of the third laser light;
A fourth laser beam having a fourth width is emitted along the second direction of the second cross section of the pipe, and the side opposite to the outside of the pipe through which a part of the third width of the third laser beam passes. A fourth light emitting device arranged so that a part of the fourth width of the fourth laser light passes through the outside,
A fourth light receiving device arranged to receive a part of the fourth width of the fourth laser light;
One of the first light-emitting device, the first light-receiving device, the third light-emitting device, and the third light-receiving device so that the outer diameter of the pipe can be measured based on the light reception results of the first to fourth light-receiving devices. A first holder that holds one of the fourth light-emitting device and the fourth light-receiving device and surrounds one half circumferential surface of the pipe; the second light-emitting device; the second light-receiving device; the third light-emitting device; A second holder that holds the other of the third light receiving device, the other of the fourth light emitting device and the fourth light receiving device, surrounds the other half circumferential surface of the pipe, and is coupled to or separated from the first holder. And a holding device that is detachably mounted around the pipe,
A first guide device that is held by the first holder and guides the holding device along a longitudinal direction of the pipe;
A second guide device that is held by the second holder and guides the holding device along a longitudinal direction of the pipe;
An outer diameter measuring device comprising: The outer diameter measuring device according to claim 1, wherein the first width and the second width are widths equal to or less than a radius of a cross section of the pipe. The outer diameter measuring device according to claim 2 , wherein the third width and the fourth width are widths equal to or less than a radius of a cross section of the pipe. Any said first and second guiding device, according to claim 1 to 3, wherein a plurality of guide rollers which roll on the circumferential surface of the pipe is elastically biased in the direction of the peripheral surface of the pipe outer diameter measuring apparatus according to an item or.

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