JP2020046205A - Relative position measurement device - Google Patents

Abstract

To easily verify the soundness of operations of a supporting device.SOLUTION: The relative position measurement device according to an embodiment is a relative position measurement device used for a supporting device having a fixing member fixed to a structure and a movable member fixed to a pipe to be movable to the fixing member and for measuring the relative position of the movable member and the fixing member. The relative position measurement device includes: a first tag fixed to the fixing member; a second tag fixed to the movable member; and a sending/receiving device for irradiating the first tag and the second tag with an electric wave, receiving sending information sent from the first tag and the second tag, and operating the relative position on the basis of the received sending information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a relative position measuring device.

  Pipes laid in factories and plants are supported by support devices such as hangers and vibration isolators. The operational soundness of this type of support device is verified using an indicator provided on a hanger or a vibration isolator as an indicator. The support device includes, for example, a fixed portion fixed to a structure and a movable portion that moves relatively to the fixed portion, and the indicator displays a relative distance between the fixed portion and the movable portion. An operator or the like can verify the operation soundness of the support device by visually checking the indicator.

  As a device for verifying the operation soundness of the support device, a recording device for recording an index shown by an indicator over time has been proposed. This type of recording apparatus records, for example, a movement locus of a movable part on a recording paper provided on a fixed part of a support device by a pen that moves in synchronization with the movable part (for example, see Patent Document 1).

JP-A-6-74793

  A support device such as a hanger or a vibration isolator is often installed in a place such as a high place where access is difficult. In this case, it may be difficult to accurately view the indicator because access to the support device is dangerous. In addition, even when the above-described recording device is used, it may be difficult to install and collect the recording device.

  The present invention has been made under the above circumstances, and has as its object to easily verify the operational soundness of a support device.

  In order to solve the above-described problems, the relative position measuring device according to the present embodiment includes a fixed member fixed to a structure, a movable member fixed to the fixed member, and a movable member fixed to a pipe. A relative position measuring device for measuring a relative position between a fixed member and a movable member, wherein the first tag is fixed to the fixed member, the second tag is fixed to the movable member, and the first tag and the second tag are fixed to the movable member. A transmission / reception device that radiates radio waves to the tag, receives transmission information transmitted from the first tag and the second tag, and calculates a relative position based on the received transmission information.

It is a block diagram showing the composition of the relative position measuring device concerning this embodiment. It is a figure showing a support device which supports piping. It is a perspective view of a support device. It is a figure showing the YZ section of a support device. It is a figure which shows the surface of + X side of a fixed part. It is a figure for explaining the use procedure and operation | movement of a transmission / reception apparatus. FIG. 7 is a diagram for describing a procedure for measuring a relative position between a fixed unit and a movable unit. FIG. 7 is a diagram for describing a procedure for measuring a relative position between a fixed unit and a movable unit. FIG. 9 is a diagram illustrating a modified example of the transmission / reception device. It is a figure which shows the modification of a support device. It is a figure which shows the modification of a support device. It is a figure for explaining the modification of a measurement procedure of a relative position of a fixed part and a movable part. It is a figure for explaining the modification of a measurement procedure of a relative position of a fixed part and a movable part. It is a figure for explaining the modification of a measurement procedure of a relative position of a fixed part and a movable part.

  Hereinafter, the present embodiment will be described with reference to the drawings. In the description, an orthogonal coordinate system including an X axis, a Y axis, and a Z axis that are orthogonal to each other is used as appropriate.

  FIG. 1 is a block diagram illustrating a configuration of a relative position measurement device 1 according to the present embodiment. The relative position measuring device 1 is a device for detecting a relative position between a fixed portion and a movable portion of a support device 10 that supports a pipe. The relative position measurement device 1 includes a pair of IC tags 21 and 22 attached to the support device 10 and a transmission / reception device 30.

  FIG. 2 is a diagram illustrating the support device 10 that supports the pipe 210. As shown in FIG. 2, the support device 10 is a spring hanger that supports the pipe 210 with respect to the structure 200. The pipe 210 is, for example, a pipe having a diameter of about 300 mm to 600 mm used in a power plant. The structure 200 is, for example, a beam of a factory building.

  FIG. 3 is a perspective view of the support device 10. As shown in FIG. 3, the support device 10 includes a fixed part 11 fixed to the structure 200 and a movable part 12 movable with respect to the fixed part.

  The fixing part 11 is a cylindrical member whose longitudinal direction is the Z-axis direction. On the + X side of the fixing portion 11, an opening 11a whose longitudinal direction is the Z-axis direction is formed. Further, two hanging pieces 111 are fixed to the upper surface. The hanging pieces 111 are arranged at predetermined intervals in the Y-axis direction, and have a circular opening 111a penetrating in the Y-axis direction at the upper end. FIG. 4 is a diagram illustrating a YZ section of the support device 10. As shown in FIG. 4, a movable part 12 and a spring 13 are housed in an internal space 112 of the fixed part 11.

  The movable portion 12 is a member including two portions, a rod-shaped rod portion 121 whose longitudinal direction is the Z-axis direction, and a circular plate-shaped flange portion 122 fixed to the upper end of the rod-shaped portion 121. The rod-shaped portion 121 is disposed so as to pass through an opening 11b provided in the bottom wall of the fixed portion 11, and has a male screw portion 121a formed at a lower end portion. The turnbuckle 14 is attached to the male screw portion 121a.

  The spring 13 is a pressing spring whose outer diameter is slightly smaller than the inner diameter of the fixed part 11. The spring 13 is disposed between the flange portion 122 of the movable portion 12 and the bottom wall surface of the fixed portion 11 so as to surround the rod portion 121 of the movable portion 12. The movable portion 12 is supported by the fixed portion 11 by the spring 13. Therefore, the movable portion 12 can relatively move with respect to the fixed portion 11 within a range where the spring 13 expands and contracts.

  FIG. 5 is a diagram illustrating a surface on the + X side of the fixing unit 11. As shown in FIG. 5, the fixing portion 11 is provided with a scale 113 whose longitudinal direction is the Z-axis direction along the opening 11a. The scale 113 is provided with scales arranged at a predetermined pitch in the Z-axis direction. A pointing member 123 that protrudes from the opening 11 a of the fixed part 11 and has a tip overlapping the scale 113 is provided on the flange part 122 that constitutes the movable part 12. The pointing member 123 moves along the scale of the scale 113 together with the movable portion 12. For this reason, the relative positional relationship between the fixed part 11 and the movable part 12 can be determined by visually checking the scale indicated by the instruction member 123.

  As shown in FIG. 2, the support device 10 configured as described above is suspended from the structure 200 by a piece 201 provided on the structure 200 and a bolt 230 penetrating the suspension piece 111 of the support device 10. Can be lowered. Then, a connecting member 205 and a pipe holder 206 fixed to the pipe 210 are attached to the turnbuckle 14.

  As shown in FIG. 4, the connecting member 205 has a male screw portion formed at the upper end. This male screw portion is attached to the turnbuckle 14. The pipe holder 206 is an annular member fixed to the pipe 210. The pipe holder 206 and the connecting member 205 are fixed by bolts 230. As shown in FIG. 2, the pipe 210 is supported by the structure 200 via the support device 10, the connecting member 205, and the pipe holder 206. In this state, the pipe 210 can be displaced within a range in which the movable part 12 can move with respect to the fixed part 11 constituting the support device 10.

  The IC tags 21 and 22 constituting the relative position measuring device 1 are fixed to a scale 113 and a pointing member 123, respectively, as shown in FIG. The IC tags 21 and 22 include, for example, an IC chip and an antenna element, and can transmit and receive information wirelessly. The IC tags 21 and 22 are shaped into, for example, a square having a side of about 1 cm, and the surface is coated with, for example, a resin through which radio waves pass. In the relative position measuring device 1, the IC tag 21 is attached to the scale 113, and the IC tag 22 is adhered to the tip of the pointing member 123. The IC tag 21 is attached so that the center of the IC tag 21 matches the reference scale of the scale 113.

The IC tags 21 and 22 store identification information for identifying the support device 10. As the identification information, for example, longitude information and latitude information indicating an installation position of the support device 10, an identification number and a name uniquely assigned to the support device 10, and the like can be considered. IC tag 21,
22 receives the identification information transmission command from the transmission / reception device 30, and transmits the identification information to the transmission / reception device 30.

  Returning to FIG. 1, the transmission / reception device 30 is a device that transmits and receives information to and from the IC tags 21 and 22. The transmission / reception device 30 is a communication terminal having a CPU (Central Processing Unit) 31, a main storage unit 32, an auxiliary storage unit 33, a display unit 34, an input unit 35, an interface unit 36, a transmission unit 38, and a reception unit 39.

  The CPU 31 executes processing described later according to a program stored in the auxiliary storage unit 33.

  The main storage unit 32 has a RAM (Random Access Memory) and the like. The main storage unit 32 is used as a work area of the CPU 31.

  The auxiliary storage unit 33 has a nonvolatile memory such as a ROM (Read Only Memory) and a semiconductor memory. The auxiliary storage unit 33 stores programs executed by the CPU 31, various parameters, and the like.

  The display unit 34 has a display unit such as an LCD (Liquid Crystal Display). The display unit 34 displays a processing result of the CPU 31 and the like.

  The input unit 35 has an input button and a pointing device such as a touch panel. The operator's instruction is input via the input unit 35 and is notified to the CPU 31 via the system bus 37.

  The interface unit 36 has a LAN interface, a serial interface, a parallel interface, and the like. The transmission unit 38 and the reception unit 39 are connected to the system bus 37 via the interface unit 36.

  The transmission unit 38 transmits information to the IC tags 21 and 22 based on an instruction from the CPU 31. The information transmitted by the transmission unit 38 includes an identification information transmission command for instructing the IC tags 21 and 22 to transmit identification information.

  The receiving unit 39 receives the information transmitted from the IC tags 21 and 22. The information received by the receiving unit 39 is output to the CPU 31. The information received by the receiving unit 39 includes identification information.

  The transmission / reception device 30 configured as described above communicates with the IC tags 21 and 22 based on the instruction of the operator. Then, based on the result of communication with the IC tags 21 and 22, the relative positions of the IC tags 21 and 22 are calculated as the relative positions of the fixed unit 11 and the movable unit 12 that constitute the supporting device 10. Hereinafter, the use procedure and operation of the transmitting / receiving device 30 according to the present embodiment will be described.

  First, as shown in FIG. 6, the transmitting / receiving device 30 is operated at a point A located below the supporting device 10 to communicate information with the IC tags 21 and 22. The point A is a point whose positional relationship with the support device 10 is known, for example. The information transmitted to the IC tags 21 and 22 is an identification information transmission command. Upon receiving the transmission command, the IC tags 21 and 22 transmit the identification information to the transmission / reception device 30.

  When receiving the identification information, the CPU 31 determines the time T1 from the time t1 at which the transmission command was transmitted to the time t2 at which the identification information was received from the IC tag 21 and the time t1 at which the transmission command was transmitted, and then returns the time from the IC tag 22. The time T2 until the time t3 when the identification information is received is calculated. Then, based on the calculation result, the distance a1 from the point A to the IC tag 21 and the distance a2 from the point A to the IC tag 22 are calculated. The distances a1 and a2 can be calculated by, for example, the following equations (1) and (2). Here, v indicates the speed of the radio wave.

a1 = T1 · v / 2 (1)
a2 = T2 · v / 2 (2)

  Next, the transmitting / receiving device 30 is operated at a point B located below the supporting device 10 to communicate information with the IC tags 21 and 22. The point B is a point whose positional relationship with the support device 10 is known, for example. The information transmitted to the IC tags 21 and 22 is an identification information transmission command. Upon receiving the transmission command, the IC tags 21 and 22 transmit the identification information to the transmission / reception device 30.

  When receiving the identification information, the CPU 31 determines the time from the time t4 at which the transmission command was transmitted to the time t5 at which the identification information was received from the IC tag 21 and the time t4 at which the transmission command was transmitted. The time T4 until the time t6 when the identification information is received is calculated. Then, based on the calculation result, the distance b1 from the point B to the IC tag 21 and the distance b2 from the point B to the IC tag 22 are calculated. The distances b1 and b2 can be calculated by, for example, the following equations (3) and (4).

b1 = T3 · v / 2 (3)
b2 = T4 · v / 2 (4)

  When the transmission / reception of information at the two points A and B is completed, the transmission / reception device 30 calculates the height difference between the IC tag 21 and the IC tag 22 using Heron's formula or the like.

  First, the CPU 31 calculates an area S1 of the triangle TR1 defined by the IC tag 21 and the points A and B. The area S1 of the triangle TR1 can be calculated using the following equation (5). Note that P1 indicates (a1 + b1 + c). C is the distance from point A to point B.

  Next, as shown in the following equation (6), the CPU 31 calculates the height h1 of the IC tag 21 by doubling the area S1 and dividing the area S1 by the distance c. The height h1 is a distance from a straight line passing through the points A and B to the IC tag 21. Hereinafter, for convenience of explanation, a straight line passing through the points A and B is referred to as a reference line.

  h1 = 2 · S1 / c (6)

  Next, the CPU 31 calculates the area S2 of the triangle TR2 defined by the IC tag 22 and the points A and B. The area S2 of the triangle TR2 can be calculated using the following equation (7). P2 indicates (a2 + b2 + c).

  Next, as shown in the following equation (8), the CPU 31 calculates the height h2 of the IC tag 22 by doubling the area S2 and dividing the area S2 by the distance c. The height h2 is a distance from the reference line to the IC tag 22.

  h2 = 2 · S2 / c (8)

  After calculating the height h1 of the IC tag 21 and the height h2 of the IC tag 22, the CPU 31 subtracts the height h2 from the height h1 and calculates the difference dh between the height of the IC tag 21 and the height of the IC tag 22. . The difference dh, as shown in FIG. 5, indicates a value that can be read from the scale indicating the reference position of the scale 113 and the scale indicated by the indicating member 123, that is, the distance between the fixed part 11 and the movable part 12. The CPU 31 displays the difference dh on, for example, the display unit 34. Thereby, the operator can confirm the relative position of the fixed part 11 and the movable part 12 which constitute the support device 10 without looking at the scale 113 of the support device 10.

  As described above, in the present embodiment, by communicating with the IC tags 21 and 22 provided on the support device 10 at two points, the point A and the point B whose positional relationship with the support device 10 is known, The relative position information between the fixed part 11 and the movable part 12 constituting the support device 10 can be measured. For this reason, the relative position of the fixed part 11 and the movable part 12 constituting the support device 10 can be confirmed without visually observing the scale of the support device 10. Therefore, even if the support device 10 is installed in a position where access is difficult, such as a high place or a dangerous place, the relative position of the fixed portion 11 and the movable portion 12 constituting the support device 10 can be easily and safely changed. Can be measured.

  Further, in the present embodiment, since the relative position between the fixed part 11 and the movable part 12 constituting the support device 10 can be easily and safely measured, as a result, the operation soundness of the support device can be easily verified. Can be done.

  In this embodiment, both the IC tags 21 and 22 are attached to the support device 10. Then, the relative distance (relative height) between the IC tag 21 and the IC tag 22 is acquired as the relative position between the fixed part 11 and the movable part 12 that constitute the support device 10. For this reason, even if the absolute position (absolute height) of the fixed part 11 or the movable part 12 fluctuates due to the vibration of the support device 10 or the distortion of the structure to which the support device 10 is attached, the fixed part 11 And the relative position of the movable part 12 can be measured.

  Japanese Patent Application Laid-Open No. 2007-114003 discloses a technique for measuring the absolute position of an IC tag. However, in the present embodiment, it is not necessary to measure the absolute positions of the IC tags 21 and 22. There is no need to provide a function such as GPS in the device 1, and the device can be simplified.

  The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments. For example, in the above embodiment, communication with the IC tags 21 and 22 is performed at two points, that is, the point A and the point B. However, the communication with the IC tags 21 and 22 may be performed at three or more points. In this case, the heights h1 and h2 of the IC tags 21 and 22 are calculated for each of the triangles defined by two of the plurality of points and the support device 10, and the average value AVGh1 of the heights h1 and AVGh1 are calculated. The difference between the average values AVGh2 of the heights h2 can be used as the relative positions of the fixed part 11 and the movable part 12 that constitute the support device 10.

  In the above-described embodiment, the IC tags 21 and 22 transmit identification information capable of identifying the support device 10 to the transmission / reception device 30. For this reason, as shown in FIG. 8, even when a plurality of supporting devices 10 provided with the IC tags 21 and 22 are provided, each supporting device 10 is provided at the point A and the point B. By performing the communication with the IC tags 21 and 22 collectively, the relative positions of the fixed unit 11 and the movable unit 12 can be simultaneously obtained for the plurality of support devices 10.

  In the above embodiment, the transmission / reception device 20 displays the difference dh indicating the relative position on the display unit 34. The invention is not limited thereto, and the transmission / reception device 20 may sequentially store the measurement results of the relative positions in the auxiliary storage unit 33. Further, the measurement result may be wirelessly transmitted to a separately installed server or the like.

  In the above embodiment, the transmission / reception device 20 displays the difference dh indicating the relative position on the display unit 34. However, the present invention is not limited to this, and when the difference dh exceeds a preset threshold, an alarm may be output to the operator. The output of the alarm may be, for example, to emit a sound or to display a text on the display unit 34.

In the above embodiment, the transmitting / receiving device 30 is operated at the points A and B to communicate with the IC tags 21 and 22, and based on the communication result at each point, the fixing unit 11 configuring the support device 10 The relative position of the movable part 12 was measured. Not limited to this, as shown in FIG. 9, transceiver 30 includes a transmission unit 38 ₁ and the receiving unit 39 ₁ is installed in the point A, the transmission is installed in place B unit 38 ₂ and the receiving unit 39 ₂ May be provided. This makes it possible to measure the relative position between the fixed unit 11 and the movable unit 12 without moving the transmitting / receiving device 30 from the point A to the point B. Therefore, it is possible to constantly monitor the operation soundness of the support device 10.

  In this case, various analyzes and the like can be performed by repeatedly executing the measurement of the relative position at a predetermined cycle and storing the measurement result over time in the auxiliary storage unit 33 or a separately installed server.

  In the above embodiment, the case where the support device 10 is a spring hanger has been described. However, the invention is not limited thereto, and the support device 10 may be a constant hanger. FIG. 10 is a diagram illustrating the support device 10A. As shown in FIG. 10, when the support device 10 </ b> A is a constant hanger, for example, the IC tag 21 is attached to the fixed portion 11, and the IC tag 22 is attached to the tip of the movable portion 12, so that transmission and reception can be performed. Using the device 30, the relative position between the fixed unit 11 and the movable unit 12 can be measured.

  In the above embodiment, the case where the support device 10 is a spring hanger has been described. However, the invention is not limited thereto, and the support device 10 may be a hydraulic vibration isolator that supports a pipe. FIG. 11 is a diagram illustrating the support device 10B. As shown in FIG. 11, when the support device 10 </ b> B is a hydraulic vibration isolator, for example, by attaching the IC tag 21 to the fixed unit 11 and attaching the IC tag 22 to the movable unit 12, transmission / reception is performed. Using the device 30, the relative position between the fixed unit 11 and the movable unit 12 can be measured. Similarly, the support device 10 may be a mechanical vibration isolator instead of a hydraulic vibration isolator.

  In the above embodiment, the case where the reference line defined by the point A and the point B passes almost directly below the support device 10 has been described. However, as an example, as shown in FIG. 12, a point A and a point B communicating with the IC tags 21 and 22 using the transmission / reception device 30 are separated from the IC tags 21 and 22 by a distance L in the X-axis direction. In this case, the relative positions of the IC tags 21 and 22, that is, the relative positions of the fixed part 11 and the movable part 12 of the support device 10 can be measured. Hereinafter, the procedure for measuring the relative position according to the first modification will be described.

  First, information is transmitted and received at the points A and B shown in FIG. Thus, the distances h1 and h2 between the reference line and the IC tags 21 and 22 can be obtained by the above-described procedure. Then, the height z1 from the ground surface to the IC tag 21 and the distance z2 from the ground surface to the IC tag 22 are calculated using the following equations (9) and (10).

  After calculating the height z1 of the IC tag 21 and the height z2 of the IC tag 22, the height z2 is subtracted from the height z1 to calculate a difference dz between the heights of the IC tag 21 and the IC tag 22. As shown in FIG. 5, the difference dz indicates a value read from a scale indicating the reference position of the scale 113 and a scale indicated on the indicating member 123, that is, a distance between the fixed unit 11 and the movable unit 12. By displaying the difference dz on the display unit 34 of the transmitting and receiving device 30, the operator can confirm the relative position between the fixed unit 11 and the movable unit 12 constituting the supporting device 10 without looking at the scale 113 of the supporting device 10. can do.

  As the distance L between the reference line and the IC tags 21 and 22 in the X-axis direction, a design value or a value actually measured by a scale or the like can be used. Also, for example, as shown in FIG. 12, an IC tag 23 is provided vertically below the IC tags 21 and 22, and communication is performed with the IC tags 23 at points A and B to calculate the distances h1 and h2. The distance L may be calculated in the same manner as described above.

  In the first modification, the case where the support device 10 supports the pipe in the vertical direction (Z-axis direction) has been described. However, as shown in FIG. 13, even when the support device 10 is inclined in a direction forming a predetermined angle with the Z axis, the relative position between the fixed portion 11 and the movable portion 12 of the support device 10 is measured. It is possible to Hereinafter, the procedure for measuring the relative position according to Modification 2 will be described.

  First, information is transmitted and received at the points A and B shown in FIG. Thus, the distances h1 and h2 between the reference line and the IC tags 21 and 22 can be obtained by the above-described procedure. Then, the height z1 from the ground surface to the IC tag 21 and the distance z2 from the ground surface to the IC tag 22 are calculated using the following equations (11) and (12). L1 is the distance between the reference line and the IC tag 21 in the X-axis direction. L2 is the distance between the reference line and the IC tag 22 in the X-axis direction.

  After calculating the height z1 of the IC tag 21 and the height z2 of the IC tag 22, the height z2 is subtracted from the height z1 to calculate a difference dz between the heights of the IC tag 21 and the IC tag 22. Further, the distance L2 is subtracted from the distance L1, and the difference dL between the reference line and the IC tags 21 and 22 is calculated. Then, the displacement y of the IC tag 21 and the IC tag is calculated using the following equation (13).

  As shown in FIG. 5, the displacement y indicates a value that can be read from a scale indicating the reference position of the scale 113 and a scale indicated on the pointing member 123, that is, a distance between the fixed unit 11 and the movable unit 12. By displaying the displacement y on the display unit 34 of the transmitting and receiving device 30, the operator can confirm the relative positions of the fixed unit 11 and the movable unit 12 constituting the supporting device 10 without looking at the scale 113 of the supporting device 10. can do.

  In general, the supporting device 10 such as a spring hanger or a constant hanger is designed such that the fixed portion 11 and the movable portion 12 are inclined by thermal deformation of the pipe, but the range is 4 degrees or less. Therefore, the measurement error of the relative position due to the inclination of the support device 10 is suppressed to about 1 to 2 mm. However, in the case where measurement is performed with high accuracy, the relative position between the fixed unit 11 and the movable unit 12 can be measured with high accuracy even when the support device 10 is inclined by performing measurement in the manner according to the present modification. become.

  When the distance between the IC tag 21 and the IC tag 22 in the Y-axis direction is small, the displacement y described above can be calculated using a trigonometric function without using the equation (13) obtained from the three-square theorem. it can.

  For example, as shown in FIG. 14, the angle between the straight line LN1 orthogonal to the reference line and passing through the IC tag 21 and the ground surface is θ1, and the angle between the straight line LN2 orthogonal to the reference line and passing through the IC tag 22 and the ground angle is θ. θ2. In this case, θ1 and θ2 are expressed by the following equations (14) and (15), respectively. Therefore, the angle formed by the straight line LN1 and the straight line LN2 is Ψ (θ2−θ1), and is expressed by the following equation (16).

  The perimeter Y of the triangle having the straight line LN1 and the straight line LN2 as two sides is represented by the sum of the distance y and the distances h1 and h2 (y + h1 + h2). Therefore, using the length Y, the distance y is expressed by the following equation (17).

y = Y- (h1 + h2) (17)

  Here, the length Y is represented by the following equation (18). Therefore, the displacement y is expressed by the following equation (19).

  Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Relative position measuring device 10, 10A, 10B Supporting device 11 Fixed part 11a Opening 11b Opening 12 Movable part 13 Spring 14 Turnbuckle 20 Transmitter / receiver 21, 22, 23 IC tag 30 Transmitter / receiver 31 CPU
32 Main storage unit 33 Auxiliary storage unit 34 Display unit 35 Input unit 36 Interface unit 37 System bus 38 Transmitting unit 39 Receiving unit 111 Hanging piece 111a Opening 113 Scale 121 Bar-shaped part 121a Male screw part 122 Flange part 123 Pointing member 200 Structure 201 Piece 205 Connecting member 206 Piping holder 210 Piping 230 Bolt

In order to solve the above-described problem, the relative position measuring device of the present embodiment includes a fixed member fixed to a structure, a movable member fixed to the fixed member, and a movable member fixed to a pipe. used includes a relative position measuring device for measuring the relative position of the stationary member and the movable member, the first tag, the second tag, and, the sending and receiving equipment. The first tag is fixed to a fixed member, and the second tag is fixed to a movable member. The transmitting / receiving device is configured to connect the first tag and the second tag at a first position on a reference line located below the first tag and the second tag and away from a virtual line in the vertical direction of the first tag and the second tag. Irradiates radio waves to receive transmission information transmitted from the first tag and the second tag, and radiates radio waves to the first tag and the second tag at a second position different from the first position on a reference line. The first tag at the first position and the second tag at the second position are respectively received based on the time from receiving the transmission information transmitted from the first tag and the second tag and irradiating the radio wave to receiving the transmission information. The first distance to the second tag and the second distance to the second tag are obtained, and the first distance, the second distance, and the distance between the first position and the second position are used to determine the first distance from the reference line. The third distance to the tag and the second tag is calculated, and the third distance and the vertical direction of the first tag and the second tag are calculated. Using the fourth distance to the virtual line and the reference line, and computing the relative position.

FIG. 5 is a diagram illustrating a surface on the + X side of the fixing unit 11. As shown in FIG. 5, the fixing portion 11 is provided with a scale 113 whose longitudinal direction is the Z-axis direction along the opening 11a. The scale 113 is provided with scales arranged at a predetermined pitch in the Z-axis direction. A pointing member 123 that protrudes from the opening 11 a of the fixed part 11 and has a tip overlapping the scale 113 is provided on the flange part 122 that constitutes the movable part 12. Indicating member 123, together with the movable portion 12 moves along the graduated scale 113. For this reason, the relative positional relationship between the fixed part 11 and the movable part 12 can be determined by visually checking the scale indicated by the instruction member 123.

In the above embodiment, the transmission / reception device 30 displays the difference dh indicating the relative position on the display unit 34. The present invention is not limited thereto, and the transmitting and receiving device 30 may sequentially store the measurement results of the relative positions in the auxiliary storage unit 33. Further, the measurement result may be wirelessly transmitted to a separately installed server or the like.

In the above embodiment, the transmission / reception device 30 displays the difference dh indicating the relative position on the display unit 34. However, the present invention is not limited to this, and when the difference dh exceeds a preset threshold, an alarm may be output to the operator. The output of the alarm may be, for example, to emit a sound or to display a text on the display unit 34.

For example, as shown in FIG. 14, an angle between the straight line LN1 orthogonal to the reference line and passing through the IC tag 21 and the ground surface is θ1, and an angle between the straight line LN2 orthogonal to the reference line and passing through the IC tag 22 and the ground surface is θ1. θ2. In this case, θ1 and θ2 are expressed by the following equations (14) and (15), respectively. Therefore, the angle of the straight line LN1 and the straight line LN2 Ψ (θ2-θ1) is represented by the following formula (16).

Claims (11)

Used for a supporting device including a fixed member fixed to a structure and a movable member movably provided to the fixed member and fixed to a pipe, and measures a relative position between the fixed member and the movable member. A relative position measuring device,
A first tag fixed to the fixed member, and a second tag fixed to the movable member,
By irradiating the first tag and the second tag with radio waves, receiving transmission information transmitted from the first tag and the second tag, and calculating the relative position based on the received transmission information A transmitting and receiving device;
Relative position measuring device comprising: The transmitting and receiving device,
A first distance to the first tag and a second distance to the second tag are obtained based on a time from when the radio wave is transmitted to when the transmission information is received, and the first distance is calculated. The relative position measuring device according to claim 1, wherein the relative position with respect to a moving direction of the movable member is calculated using the second distance and the second distance. The transmitting and receiving device,
Movement of the movable member using the first distance and the second distance obtained at a first position and the first distance and the second distance obtained at a second position different from the first position. The relative position measuring device according to claim 1, wherein the relative position with respect to a direction is calculated. The transmitting and receiving device,
A first receiving unit and a second receiving unit provided at different positions,
A first distance to the first tag and a first distance to the second tag determined based on a time until the first receiving unit receives the transmission information;
The second distance to the first tag and the second distance to the second tag obtained based on the time until the second receiving unit receives the transmission information,
The relative position measuring device according to claim 1, wherein the relative position with respect to a moving direction of the movable member is calculated using the first distance and the second distance. The transmitting and receiving device,
The relative position measurement device according to claim 3, wherein the relative position is calculated using a Heron's formula with the first distance and the second distance as variables. The transmitting and receiving device,
The relative position measuring device according to claim 1, wherein the relative position is repeatedly calculated at a constant cycle.   The relative position measurement device according to claim 1, wherein the first tag and the second tag include identification information for identifying the support device.   The relative position measuring device according to claim 7, wherein the specific information includes a position or a name of the support device. A set of the first tag and the second tag respectively provided on a plurality of the support devices;
The first tag and the second tag are each radiated with radio waves to receive transmission information transmitted from the first tag and the second tag, and based on the received transmission information, A transmitting and receiving device for calculating the relative position,
The relative position measuring device according to claim 7 or 8, further comprising: The transmitting and receiving device,
The warning according to any one of claims 1 to 9, wherein an alarm is output when it is determined that the distance between the movable member and the fixed member has exceeded a preset threshold based on the calculation result of the relative position. A relative position measuring device as described.   The relative position measuring device according to any one of claims 1 to 10, wherein the supporting device is one of a spring hanger, a constant hanger, and a vibration isolator that supports a pipe.

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