JP2015175600A - Correcting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a correcting apparatus that performs open/short correction on the parasitic component, such as a cable portion other than the electrode portion, among distortion measuring apparatuses that can measure distortion by measuring the electrostatic capacitance between the cylindrical electrode and the rod-like electrode.SOLUTION: A correcting apparatus comprises a first electrode body 7 having a cylindrical electrode 72 and a second electrode body 3 having a rod-like electrode 32 inserted into the cylindrical electrode, for correcting measurement error of a measuring apparatus that performs measurement based on the electrostatic capacitance defined according to a state in which the rod-like electrode is inserted into the cylindrical electrode. The correcting apparatus comprises a first frame on which the first electrode body is disposed and a second frame on which the second electrode body is disposed. At least one among the first frame and the second frame moves to make the cylindrical electrode and the rod-like electrode contact when a first value is obtained for the short correction on the measurement error, and moves to make the rod-like electrode come outside and separate from the cylindrical electrode when a second value is obtained for the open correction on the measurement error.

Description

  The present invention relates to a correction apparatus.

  For example, a strain measuring device that measures strain of an object to be measured is known (for example, Patent Document 1).

JP 2011-89936 A

  For example, in the strain measuring device of Patent Document 1, a cylindrical electrode and a rod-shaped electrode inserted into the cylindrical electrode are fixed to the object to be measured. In order to accurately measure the amount of strain in such a strain measuring device, it is necessary to accurately measure the capacitance between the cylindrical electrode and the rod-shaped electrode. It is effective to correct such parasitic components by open / short correction. However, in order to perform such open / short correction, it is necessary to contact / separate the electrodes from each other. For example, conventionally, correction can be performed only at room temperature, and at a high temperature for more accurate correction. Open / short correction was difficult. Therefore, in this strain measuring apparatus, since open / short correction cannot be performed at a high temperature under an actual use environment, there is a possibility that the strain measurement accuracy in the object to be measured is lowered.

  The main present invention that solves the above-described problems includes a first electrode body having a cylindrical electrode and a second electrode body having a rod-shaped electrode inserted into the cylindrical electrode, and the cylindrical electrode A correction device for correcting a measurement error of a measurement device that performs measurement based on capacitance determined according to the degree of insertion of the rod-shaped electrode into the first frame, on which the first electrode body is placed And a second gantry on which the second electrode body is placed, and at least one of the first and second gantry obtains a first value for short-circuit correcting the measurement error When the second electrode is moved so that the cylindrical electrode and the rod electrode are in contact with each other and the measurement error is subjected to open correction, the rod electrode comes out of the cylindrical electrode. The correction apparatus is characterized by moving so as to be separated.

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

  According to the present invention, it is possible to acquire the first value for correcting the measurement error by a short circuit and the second value for correcting the measurement error by open correction.

It is a figure which shows the distortion measuring apparatus in 1st Embodiment of this invention. It is a perspective view which shows a part of distortion measuring apparatus in 1st Embodiment of this invention. It is sectional drawing which shows a part of distortion measuring apparatus in 1st Embodiment of this invention. It is a front view which shows the 1st apparatus in 1st Embodiment of this invention. It is a figure which shows the correction | amendment apparatus of the state which separated the rod-shaped electrode and cylindrical electrode in 1st Embodiment of this invention. It is a perspective view showing the amendment device in a 1st embodiment of the present invention. It is a figure which shows the correction | amendment apparatus of the state which made the rod-shaped electrode and cylindrical electrode in 1st Embodiment of this invention contact. It is a block diagram which shows the strain meter in 1st Embodiment of this invention. It is a figure which shows the distortion measuring apparatus in 2nd Embodiment of this invention.

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

[First embodiment]
=== Strain measuring device ===
Hereinafter, the strain measuring apparatus according to the present embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating a strain measuring apparatus according to the present embodiment. In addition, the 1st electrode body 7 and the 2nd electrode body 3 are shown as sectional drawing in the cross section which passes through the approximate center of the 1st electrode body 7 and the 2nd electrode body 3, and is parallel to XZ plane (FIG. 2). . The configuration corresponding to the capacitance meter 5 is surrounded by a one-dot chain line. Signal lines surrounded by conductors such as coaxial cables are indicated by broken lines. FIG. 2 is a perspective view showing a part of the strain measuring apparatus in the present embodiment. In FIG. 2, for convenience of explanation, the first coaxial cable 93, the second coaxial cable 91 (also referred to as “each coaxial cable”), the adjusting screw 86 (FIG. 4), and the like are omitted.

  The strain measuring device 300 is a device for measuring the strain amount of a welded portion in a boiler, a turbine, a pipe or the like provided in, for example, a thermal power plant. Note that the strain amount indicates, for example, the amount of displacement of the measurement object according to the deformation of the measurement object. The strain measuring apparatus 300 is, for example, an electrostatic capacity method for measuring the amount of strain of a measurement target portion 401 such as a welded portion in a metal pipe 400 (measurement object) having a relatively high temperature of about 600 ° C. Displacement meter.

  The strain measuring device 300 includes a first device 800 (FIG. 2), a second device 200, a capacity meter 5 (measuring device), and a strain meter 4. In the present embodiment, the Z axis is an axis along the height direction (vertical direction) where the first device 800 and the second device 200 are erected, and + Z is an upward direction from the pipe 400 toward the first device 800. A direction is indicated, and −Z indicates a downward direction from the first device 800 toward the pipe 400. The X axis is an axis along the direction in which the first device 800 and the second device 200 are adjacent to each other, + X indicates the direction from the second device 200 toward the first device 800, and -X is the first device. It is assumed that the direction from 800 toward the second device 200 is shown. The Y axis is an axis orthogonal to the X axis and the Z axis, and + Y is from one side surface of the first device 800 where the slit 8B is provided to the other side surface where the slit 8B is not provided. The direction to go is shown, -Y shall show the direction which goes to the one side surface from the other side surface in the 1st apparatus 800. FIG.

  When the first device 800 and the second device 200 measure the strain amount of the measurement target portion 401 in the metal pipe 400, the first device 800 and the second device 200 are arranged on both sides of the measurement target portion 401 in the direction (X axis) in which the pipe 400 extends. Provided. The first device 800 and the second device 200 function as sensors for measuring the strain amount in the direction in which the pipe 400 extends in the measurement target portion 401 (longitudinal direction of the pipe 400).

  The capacitance meter 5 is, for example, an LCR meter for measuring the capacitance of a capacitor formed by the rod-shaped electrode 32 and the cylindrical electrode 72 (also referred to as “a capacitor formed by electrodes”).

  The strain meter 4 measures the strain amount of the measurement target portion 401 based on the measurement result of the capacitance meter 5.

=== first device, second device ===
Hereinafter, the first device and the second device in the present embodiment will be described with reference to FIGS. 1 to 4. FIG. 3 is a cross-sectional view showing a part of the strain measuring apparatus according to the present embodiment. FIG. 3 shows the first device 800 and the second device 200 in the state viewed from the XZ plane passing through the approximate center of the first device 800 in FIG. 2 toward the + Y direction. In FIG. 3, the adjusting screw 86 (FIG. 4) is omitted for convenience of explanation. FIG. 4 is a front view showing the first device in the present embodiment.

= First device =
The first device 800 is fixed by welding, for example, on the + X side of the measurement target portion 401 in the pipe 400. The first device 800 includes a first attachment device 8 and a first electrode body 7.

<First mounting device>
The first attachment device 8 is a device for detachably attaching the first electrode body 7 to the pipe 400 and is fixed to the pipe 400. The first attachment device 8 includes a first metal member 81, first insulating members 82 and 83, a metal leg 85, and an adjusting screw 86 (FIG. 4).

  The first metal member 81 is disposed between the first insulating members 82 and 83 and the pipe 400 so that the rod-shaped electrode 32 is inserted into the cylindrical electrode 72 in order to attach the first electrode body 7 to the pipe 400. The first insulating members 82 and 83 are surrounded.

  The first metal member 81 has a slit 8B and screw holes 81A and 81B. The slit 8 </ b> B is a gap for deforming the metal member 81. The screw holes 81A and 81B are provided along the Z axis on the side (-Y) where the slit 8B is provided in the first metal member 81.

  Legs 85 are welded, for example, to the four corners of the bottom surface (−Z) of the first metal member 81. The leg 85 is welded to the pipe 400, for example. That is, the first metal member 81 is firmly fixed to the pipe 400 by the legs 85.

  The first insulating members 82 and 83 are a pair of insulating members such as ceramics for holding the first electrode body 7 in an electrically insulated state with respect to the pipe 400. The first insulating members 82 and 83 are fixed inside the first metal member 81. The first insulating members 82 and 83 are fixed to the upper and lower sides in the Z axis, respectively.

  The adjusting screw 86 is used to deform the first metal member 81 in order to hold the first electrode body 7. The adjusting screw 86 is continuously screwed into the screw holes 81A and 81B. When the width of the slit 8 </ b> B in the Z-axis direction is narrowed by the adjusting screw 86, the first electrode body 7 provided inside the first metal member 81 is sandwiched between the first insulating members 82 and 83. The first electrode body 7 is attached to the pipe 400 by the first attachment device 8.

<First electrode body>
The first electrode body 7 includes a first case 71, a cylindrical electrode 72, and a first support member 73.

  The first case 71 is, for example, a metal housing that houses the cylindrical electrode 72. The external shape of the first case 71 has, for example, a cylindrical shape. The first case 71 has a hollow structure so that the cylindrical electrode 72 can be accommodated therein. Note that the length of the first case 71 in the X-axis direction is longer than the length of the cylindrical electrode 72 in the X-axis direction so that the entire cylindrical electrode 72 can be accommodated. The inner diameter of the first case 71 is larger than the outer diameter of the cylindrical electrode 72.

  The first case 71 has a first opening 74 and a second opening 75.

  One end of the first coaxial cable 93 is inserted into the first opening 74. The first opening 74 is provided on the opposite side (+ X) to the second electrode body 3 side (−X). The second opening 75 communicates with the inside of the cylindrical electrode 72. The second opening 75 is provided on the second electrode body 3 side.

  The first support member 73 supports the cylindrical electrode 72 inside the first case 71 so that the cylindrical electrode 72 does not contact the first case 71. The first support member 73 is an insulating member such as ceramics. The first support member 73 may be provided in the entire interior of the first case 71.

  The cylindrical electrode 72 is a metal member for forming a capacitor together with the rod-shaped electrode 32. The cylindrical electrode 72 extends along the longitudinal direction (X axis) of the pipe 400. The cylindrical electrode 72 is inserted so that the rod-shaped electrode 32 can advance and retreat along the X axis. The cylindrical electrode 72 is fixed inside the first case 71 by the first support member 73 so as not to contact the first case 71.

= Second device =
The second device 200 is fixed by welding, for example, closer to the −X side than the measurement target portion 401 in the pipe 400. The second device 200 includes a second attachment device 2 and a second electrode body 3.

<Second mounting device>
The second attachment device 2 is a device for detachably attaching the second electrode body 3 to the pipe 400 and is fixed to the pipe 400.

  The configuration of the second mounting device 2 is the same as the configuration of the first mounting device 8. That is, the second metal member 21, the second insulating members 22 and 23, the adjusting screw (not shown), and the legs 25 in the second attachment device 2 are configured with the first metal member 81, the first insulating members 82 and 83, The configuration is the same as that of the adjusting screw 86 and the leg 85.

<Second electrode body>
The second electrode body 3 includes a second case 31, a rod-shaped electrode 32, and a second support member 33.

  The second case 31 is, for example, a metal housing that houses a part of the rod-shaped electrode 32. The external shape of the second case 31 has, for example, a cylindrical shape. The second case 31 has a hollow structure so that a part of the rod-shaped electrode 32 can be accommodated therein. The inner diameter of the second case 31 is made larger than the outer diameter of the rod electrode 32.

  The second case 31 has a first opening 34 and a second opening 35.

  One end of the second coaxial cable 91 is inserted into the first opening 34. The first opening 34 is provided on the side (−X) opposite to the first electrode body 7 side (+ X). A rod-shaped electrode 32 protrudes from the second opening 35. The second opening 35 is provided on the first electrode body 7 side.

  The second support member 33 supports the rod-shaped electrode 32 inside the second case 31 so that the rod-shaped electrode 32 does not contact the second case 31. The second support member 33 is an insulating member such as ceramics. The second support member 33 may be provided in the entire interior of the second case 31.

  The rod-shaped electrode 32 is a metal member for forming a capacitor together with the cylindrical electrode 72. The rod-shaped electrode 32 extends along the longitudinal direction (X axis) of the pipe 400. The rod-shaped electrode 32 is inserted into the cylindrical electrode 72 so as to be movable back and forth along the X axis. The rod-shaped electrode 32 is fixed inside the second case 31 by the second support member 33 so as not to contact the second case 31. The rod-shaped electrode 32 has a cylindrical shape, for example.

<Capacitance of capacitor>
The capacitance value of the capacitor formed by the rod-shaped electrode 32 and the cylindrical electrode 72 depends on the distance between the first device 800 and the second device 200 in the direction (X axis) in which the pipe 400 extends. Will be determined. That is, the capacitance value of the capacitor is determined according to the length of the portion of the rod-like electrode 32 inserted into the cylindrical electrode 72. Therefore, the strain amount in the direction (X axis) in which the rod-shaped electrode 32 in the measurement target portion 401 is inserted into the cylindrical electrode 72 can be obtained based on the fluctuation of the capacitance value of the capacitor.

=== Capacitance meter ===
Hereinafter, the capacity meter in the present embodiment will be described with reference to FIG.

  The capacitance meter 5 is a device that measures the capacitance of the capacitor formed by the electrodes based on, for example, an automatic balance bridge method.

  The capacitance meter 5 includes a voltage source 513, a voltmeter 523, an amplifier 533, and an ammeter 543. The capacitance meter 5 is connected to the cylindrical electrode 72 and the rod-shaped electrode 32 via respective coaxial cables.

<Connection>
The other end of the signal line 931 of the first coaxial cable 93 is connected to the cylindrical electrode 72 by, for example, spot welding. One end of the signal line 931 is connected to one input of the amplifier 533 and one end of the ammeter 543 to the bifurcated connector 63. Connected through. The other end of the conductor 932 as the outer skin of the first coaxial cable 93 is connected to the first case 71, and one end of the conductor 932 is connected to the other input of the amplifier 533 and the other end of the ammeter 543 via the bifurcated connector 63. It is connected.

  The other end of the signal line 911 of the second coaxial cable 91 is connected to the rod-shaped electrode 32 by spot welding, for example, and one end of the signal line 911 is connected to one end of the voltage source 513 and one end of the voltmeter 523 via the bifurcated connector 61. It is connected. The other end of the conductor 912 as the outer cover of the second coaxial cable 91 is connected to the second case 31, and one end of the conductor 912 is connected to the other end of the voltage source 513 and the other end of the voltmeter 523 via the bifurcated connector 61. It is connected.

<Capacity measurement>
The capacitance meter 5 measures the capacitance of the capacitor formed by the electrodes based on the output voltage of the voltage source 513, the measurement results of the voltmeter 523 and the ammeter 543, and outputs measurement information indicating the measurement results. Note that the first case 71 and the second case 31 are electrically connected via the conductive cable 900 in order to pass the guard current and improve the capacitance measurement accuracy.

  The capacitance meter 5 performs short correction and open correction on the measurement value of the capacitance meter 5 to correct the measurement error, and then outputs the above-described measurement information.

<Short correction and open correction>
The capacitance meter 5 performs short correction using the first value for performing short correction, and performs open correction using the second value for performing open correction. In order to perform the short correction and the open correction, the capacitance meter 5 acquires the first value and the second value.

  When acquiring the first value, the rod-shaped electrode 32 and the cylindrical electrode 72 need to be connected to each other. Moreover, when acquiring a 2nd value, it is necessary to make the rod-shaped electrode 32 and the cylindrical electrode 72 into the state mutually spaced apart.

=== Correction device ===
Hereinafter, the correction apparatus according to the present embodiment will be described with reference to FIGS.

  FIG. 5 is a diagram illustrating the correction device in a state where the rod-like electrode and the cylindrical electrode are separated from each other in the present embodiment. FIG. 6 is a perspective view showing a correction apparatus according to this embodiment. FIG. 7 is a diagram illustrating the correction device in a state in which the rod-shaped electrode and the cylindrical electrode are in contact with each other in the present embodiment. 5 and 7 are cross-sectional views corresponding to FIG. 5 and 7, the guides 511 and 512 are omitted for convenience of explanation.

= Correction environment =
The correction device 100 is a device that moves the first electrode body 7 and the second electrode body 3 inside the electric furnace 101 when acquiring the first value and the second value. The electric furnace 101 has a relatively high temperature of, for example, about 600 ° C. in order to simulate a measurement environment in which the strain measuring device 300 measures the strain amount of the pipe 400. That is, the environment in which the first value and the second value are acquired is a simulation of the measurement environment in which the strain measuring device 300 measures the strain amount of the pipe 400.

= Configuration =
The correction device 100 includes a first frame 50, a second frame 10, and a transmission rod 103.

<First stand>
The first mount 50 is made of an insulating material such as ceramics. The first gantry 50 is fixed at a predetermined position inside the electric furnace 101. The 1st mount 50 has the inclined surface 51, the attachment surface 52, and the guides 511 and 512 (FIG. 6).

  The attachment surface 52 is formed on the top surface (+ Z) of the first mount 50. The first attachment device 8 </ b> C is fixed to the attachment surface 52. The first attachment device 8 </ b> C is a device for detachably attaching the first electrode body 7 to the first mount 50 and has the same configuration as the first attachment device 8.

  The inclined surface 51 is provided on the upper part (+ Z) of the first mount 50. The inclined surface 51 is inclined so that the distance from the bottom surface 511 in the Z-axis direction increases from the −X side to the + X side.

  The guides 511 and 512 are members for guiding the second gantry 10 to slide on the inclined surface 51 by providing the second gantry 10 between the guides 511 and 512 in the Y axis.

<Second stand>
The second gantry 10 is formed of an insulating material such as ceramics. The second gantry 10 is placed on the inclined surface 51 so that it can slide on the inclined surface 51 inside the electric furnace 101. The second mount 10 has an inclined surface 11 and an attachment surface 12.

  The mounting surface 12 is formed on the top surface (+ Z) of the second mount 10. The second attachment device 2B is fixed to the attachment surface 12. The second attachment device 2B is a device for detachably attaching the second electrode body 3 to the second gantry 10 and has the same configuration as the second attachment device 2.

  The inclined surface 11 is provided in the lower part (−Z) of the second mount 10. The inclined surface 11 is inclined so that the distance from the mounting surface 12 in the Z-axis direction becomes shorter from the −X side toward the + X side. The inclined surface 11 faces the inclined surface 51 so that the second mount 10 slides on the inclined surface 51 and moves. Then, the inclined surface 51 and the inclined surface 51 of the first pedestal 50 are arranged so that the rod-shaped electrode is obtained when the second pedestal 10 slides on the inclined surface 51 based on the moving force F2 when acquiring the first value. The outer periphery of 32 is inclined so as to be in contact with a part of the inner periphery of the cylindrical electrode 72.

<Transmission rod>
The transmission rod 103 is, for example, an insulating rod member for transmitting the moving force F1 (FIG. 5) and the moving force F2 (FIG. 7) for moving the second frame 10 relative to the second frame 10. The second frame 10 is attached to the side surface 13 on the −X side. The transmission rod 103 is inserted into the insertion hole 102 of the electric furnace 101 so that the moving forces F1 and F2 can be transmitted from the outside of the electric furnace 101. One end of the transmission rod 103 protrudes from the inside of the electric furnace 101 to the outside through the insertion hole 102.

=== Acquisition of correction value ===
Hereinafter, with reference to FIGS. 5 and 7, correction value acquisition in the present embodiment will be described.

<Acquisition of second value for open correction (FIG. 5)>
When acquiring the second value, a moving force F <b> 1 for moving the second gantry 10 from + X toward −X outside the electric furnace 101 is transmitted to one end of the transmission rod 103. Based on this moving force F1, the second frame 10 moves from + X toward -X. At this time, the rod-shaped electrode 32 goes out of the cylindrical electrode 72 and is separated from the cylindrical electrode 72. Further, at this time, the capacity meter 5 acquires the second value.

<Acquisition of first value for short correction (FIG. 7)>
When acquiring the first value, the moving force F <b> 2 for moving the second gantry 10 from −X to + X outside the electric furnace 101 is transmitted to one end of the transmission rod 103. Based on this moving force F2, the 2nd mount 10 moves toward -X from -X. At this time, a part of the outer periphery of the rod-shaped electrode 32 comes into contact with a part of the inner periphery of the cylindrical electrode 72. Further, at this time, the capacity meter 5 acquires the first value.

  For example, in order to ensure separation and contact between the rod-shaped electrode 32 and the cylindrical electrode 72, a regulating member that regulates the moving range of the second gantry 10 is provided at a predetermined position inside the electric furnace 101. It is good.

  When measuring the strain amount of the pipe 400 using the strain measuring device 300, the capacitance meter 5 performs, for example, each short correction and open correction by using the first value and the second value acquired as described above. The measurement error is corrected based on the stray capacitance of the coaxial cable.

=== Strain meter ===
Hereinafter, the strain gauge in the present embodiment will be described with reference to FIG. FIG. 8 is a block diagram showing a strain gauge in the present embodiment.

  The strain gauge 4 includes a strain measurement unit 46 and a control unit 47.

  Based on the measurement information received from the capacitance meter 5, the strain measurement unit 46 calculates the strain amount of the pipe 400 from the capacitance value of the capacitor formed by the electrodes, and outputs or displays the calculation result. In the measurement information received from the capacity meter 5, the short correction and the open correction performed using the first value and the second value are reflected. In addition, for example, strain information indicating the relationship between the capacitance value of the capacitor formed by the electrode and the strain amount of the pipe 400 is included in various types of information. The amount of distortion may be calculated. The control unit 47 controls the capacity meter 5.

=== Measurement of strain amount ===
Hereinafter, with reference to FIG. 3, FIG. 5 and FIG. 7, the measurement of the distortion amount in the present embodiment will be described.

  In order to obtain the first value and the second value, the first electrode body 7 and the second electrode body 3 are attached to the first attachment device 8C and the second attachment device 2B, respectively. At this time, the first electrode body 7 and the second electrode body 3 are placed on the first frame 50 and the second frame 10, respectively.

  The moving force F <b> 1 (FIG. 5) is transmitted to one end of the transmission rod 103, and the rod-shaped electrode 32 comes out of the cylindrical electrode 72 and is separated from the cylindrical electrode 72. At this time, the capacity meter 5 acquires the second value. The moving force F <b> 2 (FIG. 7) is transmitted to one end of the transmission rod 103, and a part of the outer periphery of the rod-shaped electrode 32 comes into contact with a part of the inner periphery of the cylindrical electrode 72. At this time, the capacity meter 5 acquires the first value.

  Thereafter, in order to measure the strain amount of the pipe 400, the first electrode body 7 and the second electrode body 3 are attached to the first attachment device 8 and the second attachment device 2, respectively. At this time, the first electrode body 7 and the second electrode body 3 are attached to the pipe 400. The strain gauge 4 measures the strain amount of the pipe 400 based on the capacitance value of the capacitor formed by the electrodes.

  As described above, the correction device 100 includes the first electrode body 7 having the cylindrical electrode 72 and the second electrode body 3 having the rod-shaped electrode 32 inserted into the cylindrical electrode 72. This is a device for correcting a measurement error of the capacitance meter 5 that performs measurement based on the capacitance determined according to how the rod-shaped electrode 32 is inserted into the electrode 72. The correction device 100 includes a first mount 50 and a second mount 10. The first electrode body 7 is placed on the first mount 50. The second electrode body 3 is placed on the second gantry 10. For example, when acquiring the first value for correcting the measurement error of the capacitance meter 5 by short-circuiting, the second gantry 10 moves so that the cylindrical electrode 72 and the rod-shaped electrode 32 are in contact with each other, and the measurement error of the capacitance meter 5 is detected. When the second value for correcting the open angle is acquired, the rod-shaped electrode 32 moves so as to be separated from the cylindrical electrode 72. Therefore, it is possible to acquire the first value for correcting the measurement error of the capacitance meter 5 and the second value for performing open correction of the measurement error.

  Moreover, the 1st mount frame 50 has the inclined surface 51 (1st inclined surface). The 2nd mount 10 has the inclined surface 11 (2nd inclined surface) facing the inclined surface 51 so that the 2nd mount 10 may slide on the inclined surface 51 and move. When the second frame 10 acquires the first value, the rod-shaped electrode 32 slides on the inclined surface 51 so that the rod-shaped electrode 32 contacts the cylindrical electrode 72, and when the second value is acquired, the rod-shaped electrode 32 is cylindrical. It slides and moves on the inclined surface 51 so that it goes out of the electrode 72 and is separated. Therefore, the rod-shaped electrode 32 and the cylindrical electrode 72 are reliably brought into contact with and separated from each other, and the first value and the second value can be reliably acquired.

  In addition, the inclined surface 11 and the inclined surface 51 are configured such that when the second frame 10 slides on the inclined surface 51 when the first value is acquired, a part of the outer periphery of the rod-shaped electrode 32 is the cylindrical electrode 72. It inclines so that it may contact a part of inner periphery. Therefore, when acquiring the first value, the rod-shaped electrode 32 and the cylindrical electrode 72 can be reliably brought into contact with each other. Therefore, it is possible to reliably acquire the first value and the second value.

  The first mount 50 includes guides 511 and 512 that guide the second mount 10 to slide and move on the inclined surface 51. Therefore, for example, the second mount 10 can be reliably moved so that the second mount 10 is prevented from coming off from the first mount 50 and the rod-shaped electrode 32 and the cylindrical electrode 72 are in contact with or separated from each other. it can. Therefore, it is possible to reliably acquire the first value and the second value.

  Further, the correction device 100 includes a transmission rod 103 attached to the second frame 10 in order to transmit the moving forces F1 and F2 for moving the second frame 10 to the second frame 10. Therefore, for example, a driving device or the like for applying a moving force for moving the second gantry 10 becomes unnecessary. Therefore, it is possible to provide the correction device 100 that has a relatively simple configuration and is easy to use.

  The first mount 50 and the second mount 10 are provided inside an electric furnace 101 having an insertion hole 102. One end of the transmission rod 103 protrudes to the outside of the electric furnace 101 through the insertion hole 102 so that the moving forces F1 and F2 are applied to the second gantry 10 from the outside of the electric furnace 101. Therefore, it is possible to acquire the first value and the second value in an environment that simulates the measurement environment of the strain amount of the pipe 400 by the strain measuring device 300. Therefore, the measurement accuracy of the capacity meter 5 can be improved.

  The first gantry 50 is fixed at a predetermined position inside the electric furnace 101. Therefore, it is possible to acquire the first value and the second value by moving only the second frame 10 as one of the first frame 50 and the second frame 10. Therefore, it is possible to provide the correction device 100 that is easy to use.

[Second Embodiment]
=== Strain measuring device ===
The correction device 100 is also applied to the strain measurement device 300B (FIG. 9) in the second embodiment. The strain measuring apparatus 300B is obtained by changing the first electrode body 7 and the second electrode body 3 to the first electrode body 7B and the second electrode body 3B, respectively, in the strain measuring apparatus 300 of the first embodiment.

  Hereinafter, with reference to FIG. 9, the distortion measuring apparatus according to the present embodiment will be described. FIG. 9 is a diagram illustrating a strain measuring apparatus according to the present embodiment. The same reference numerals are given to the same components as those shown in FIG. 1, and the description thereof will be omitted.

  The strain measuring apparatus 300B includes a first electrode body 7B and a second electrode body 3B.

  The first electrode body 7B has a first case 71B. The first case 71B has first openings 74A and 74B.

  One end of the first coaxial cable 94 is inserted into the first opening 74B. One end of the second coaxial cable 93B is inserted into the first opening 74A. The first openings 74A and 74B are provided on the side (+ X) opposite to the second electrode body 3B side (−X).

  The second electrode body 3B has a second case 31B. The second case 31B has first openings 34A and 34B.

  One end of the third coaxial cable 92 is inserted into the first opening 34B. One end of the fourth coaxial cable 91B is inserted into the first opening 34A. The first openings 34A and 34B are provided on the side (−X) opposite to the first electrode body 7B side (+ X).

  The capacitance meter 5 is connected to the cylindrical electrode 72 and the rod-shaped electrode 32 via respective coaxial cables.

<Connection>
The other end of the signal line 941 of the first coaxial cable 94 is connected to the cylindrical electrode 72 by spot welding, for example, and one end of the signal line 941 is connected to one end of the ammeter 543. The other end of the conductor 942 as the outer cover of the first coaxial cable 94 is connected to the first case 71B, and one end of the conductor 942 is connected to the other end of the ammeter 543.

  The other end of the signal line 931B of the second coaxial cable 93B is connected to the cylindrical electrode 72 by spot welding, for example, and one end of the signal line 931B is connected to one input of the amplifier 533. The other end of the conductor 932B as the outer cover of the second coaxial cable 93B is connected to the first case 71B, and one end of the conductor 932B is connected to the other input of the amplifier 533.

  The other ends of the signal lines 941 and 931B are coupled to each other by a cylindrical electrode 72 inside the first case 71B. The other ends of the signal lines 941 and 931B are coupled to the + X side end of the cylindrical electrode 72, respectively. For example, the other ends of the signal lines 941 and 931B may be coupled at predetermined positions other than the + X side end of the cylindrical electrode 72, or between the first case 71B and the cylindrical electrode 72. It is good also as having couple | bonded in the predetermined position.

  The other end of the signal line 921 of the third coaxial cable 92 is connected to the rod-shaped electrode 32 by, for example, spot welding, and one end of the signal line 921 is connected to one end of the voltmeter 523. The other end of the conductor 922 as an outer skin of the third coaxial cable 92 is connected to the second case 31 </ b> B, and one end of the conductor 922 is connected to the other end of the voltmeter 523.

  The other end of the signal line 911B of the fourth coaxial cable 91B is connected to the rod-shaped electrode 32 by spot welding, for example, and one end of the signal line 911B is connected to one end of the voltage source 513. The other end of the conductor 912B as the outer cover of the fourth coaxial cable 91B is connected to the second case 31B, and one end of the conductor 912B is connected to the other end of the voltage source 513.

  The other ends of the signal lines 921 and 911B are coupled to each other by a rod-shaped electrode 32 inside the second case 31B. The other ends of the signal lines 921 and 911B are coupled to the −X side end of the rod-shaped electrode 32, respectively. For example, the other ends of the signal lines 921 and 911B may be coupled at predetermined positions other than the −X side end of the rod-shaped electrode 32, or between the second case 31B and the rod-shaped electrode 32. It is good also as having couple | bonded in the predetermined position.

  The first and second embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  Although 1st Embodiment demonstrated that the 1st electrode body 7 was mounted in the 1st mount 50, and the 2nd electrode body 3 was mounted in the 2nd mount 10, it is not limited to this. Absent. For example, the second electrode body 3 may be placed on the first base 50 and the first electrode body 7 may be placed on the second base 10. Alternatively, the first electrode body 7B (second embodiment) may be placed on the first base 50, and the second electrode body 3B may be placed on the second base 10, or the first base 50 may be The two-electrode body 3B may be placed, and the first electrode body 7B may be placed on the second frame 10.

  In the first and second embodiments, the second pedestal 10 is movable and the first pedestal 50 is fixed. However, the present invention is not limited to this. For example, the second mount 10 may be fixed, and the first mount 50 may be movable. Further, for example, both the second frame 10 and the first frame 50 may be movable.

  Moreover, although 1st and 2nd embodiment demonstrated moving the 2nd mount frame 10 based on the moving forces F1 and F2 transmitted via the transmission rod 103, it is not limited to this. . For example, a rail may be laid in the electric furnace 101, and a driving device for moving the second gantry 10 along the rail may be provided. In this case, for example, when acquiring the first value, the second gantry 10 is driven by the driving device so that the cylindrical electrode 72 and the rod-shaped electrode 32 come into contact with each other based on the first control signal transmitted from the control device to the driving device. It will be moved by. For example, when acquiring the second value, the second gantry 10 is driven by the driving device so that the cylindrical electrode 72 and the rod-shaped electrode 32 are separated from each other based on the second control signal transmitted from the control device to the driving device. It will be moved.

  In the first embodiment, when the second frame 10 slides on the inclined surface 51 when acquiring the first value, a part of the outer periphery of the rod-shaped electrode 32 is the inner periphery of the cylindrical electrode 72. Although contact with a part has been described, the present invention is not limited to this. For example, both the inclined surfaces 51 and 11 are substantially horizontal, and when the second frame 10 slides on the inclined surface 51 when acquiring the first value, the tip of the rod electrode 32 is a cylindrical electrode. 72 may be in contact with the end portion on the −X side.

  The first mount 50 and the second mount 10 may have a first inclined surface and a second inclined surface corresponding to the inclined surface 51 and the inclined surface 11, respectively. In this case, for example, the first inclined surface of the first gantry 50 is inclined so that the distance from the bottom surface 511 in the Z-axis direction becomes shorter from the −X side toward the + X side. The inclined surface may be inclined so that the distance from the mounting surface 12 in the Z-axis direction becomes longer as it goes from the −X side to the + X side. That is, the 1st mount frame 50 and the 2nd mount frame 10 are good also as having the 1st inclined surface and the 2nd inclined surface which are inclined in the opposite direction to the inclined surface 51 and the inclined surface 11, respectively.

  Further, the second frame 12 may include a guide having the same configuration as the guides 511 and 512.

  In the second embodiment, the other end of the signal lines 931 and 941 is connected to the cylindrical electrode 72, and the other end of the signal lines 911 and 921 is connected to the rod-shaped electrode 32. However, the present invention is not limited to this. Is not to be done. For example, the other ends of the signal lines 931 and 941 may be connected to the rod-shaped electrode 32, and the other ends of the signal lines 911 and 921 may be connected to the cylindrical electrode 72.

  In the first and second embodiments, the capacitance meter 5 measures the capacitance of the capacitor formed by the electrodes based on the automatic balance bridge method. However, the present invention is not limited to this. For example, the capacitance meter 5 may measure the capacitance of the capacitor formed by the electrodes based on a measurement method such as a two-terminal method, a three-terminal method, a four-terminal method, or a five-terminal method. For example, the capacitance meter 5 may measure the capacitance of the capacitor formed by the electrodes based on a measurement method other than the automatic balanced bridge method such as a bridge method or a resonance method.

3, 3B Second electrode body 4 Strain meter 5 Capacitance meter 7, 7B First electrode body 31, 31B Second case 32 Rod electrode 71, 71B First case 72 Tubular electrode 300, 300B Strain measuring device 400 Piping 911, 911B , 921, 931, 931B, 941 signal line

Claims (7)

A first electrode body having a cylindrical electrode, and a second electrode body having a rod-shaped electrode inserted into the cylindrical electrode, and depending on how the rod-shaped electrode is inserted into the cylindrical electrode A correction device for correcting a measurement error of a measurement device that performs measurement based on a capacitance determined by
A first mount on which the first electrode body is placed;
A second frame on which the second electrode body is placed;
At least one of the first and second mounts moves so that the cylindrical electrode and the rod-shaped electrode are in contact with each other when acquiring the first value for correcting the measurement error by short-circuiting, When acquiring the 2nd value for carrying out an open correction of the measurement error, the rod-shaped electrode moves out of the cylindrical electrode and moves away. The other of the first and second mounts has a first inclined surface,
The one pedestal has a second inclined surface facing the first inclined surface so as to slide and move on the first inclined surface;
When the one pedestal acquires the first value, the rod-shaped electrode slides on the first inclined surface so as to contact the cylindrical electrode, and when the second value is acquired, The correction apparatus according to claim 1, wherein the rod-shaped electrode slides and moves on the first inclined surface such that the rod-shaped electrode comes out of the cylindrical electrode and is separated. In the first and second inclined surfaces, when the first base slides on the first inclined surface when the first value is acquired, a part of the outer periphery of the rod-shaped electrode is the cylindrical shape. The correction device according to claim 2, wherein the correction device is inclined so as to contact a part of the inner periphery of the electrode. The correction device according to claim 2, wherein the other gantry further includes a guide that guides the one gantry to slide and move on the first inclined surface. The correction device according to claim 1, further comprising: a transmission rod attached to the one frame so as to transmit a moving force for moving the one frame to the one frame. The one and other pedestals are provided inside a furnace having an insertion hole,
The one end of the transmission rod protrudes to the outside of the furnace through the insertion hole so that the moving force is applied from the outside of the furnace to the one frame. 2. The correction device according to 2. The correction device according to claim 6, wherein the other gantry is fixed at a predetermined position inside the furnace.

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